CS4271
24-Bit, 192 kHz Stereo Audio CODEC
D/A Features
A/D Features
! High
! High
Performance
– 108 dB Dynamic Range
– -98 dB THD+N
– 114 dB Dynamic Range
– -100 dB THD+N
! Up
to 192 kHz Sampling Rates
Analog Architecture
! Multi-bit Delta Sigma Conversion
! High-pass Filter or DC Offset Calibration
! Low-Latency Digital Anti-alias Filtering
! Automatic Dithering of 16-bit Data
! Selectable Serial Audio Interface Formats
! Up
to 192 kHz Sampling Rates
! Differential Analog Architecture
! Volume Control with Soft Ramp
! Single-Ended
– 1 dB Step Size
– Zero Crossing Click-free Transitions
! Selectable
Digital Filters
– Fast and Slow Roll Off
– Left Justified up to 24-bit
– I2S up to 24-bit
! ATAPI
Mixing Functions
! Selectable Serial Audio Interface Formats
– Left Justified up to 24-bit
– I2S up to 24-bit
– Right Justified 16-, 18-, 20-, and 24-Bit
! Control
Output for External Muting
! Selectable 50/15 µs De-emphasis
Serial
Audio
Output
Interface with 5V to 2.5V Logic Levels
! Internal Digital Loopback
! On-chip Oscillator
! Stand-Alone or Control Port Functionality
Internal Voltage
Reference
Volume
Control
Volume
Control
Mixer
Level Translator
Cirrus Logic, Inc.
www.cirrus.com
! Direct
5V
Register / Hardware
Configuration
PCM Serial Interface / Loopback
Serial
Audio
Input
Level Translator
Reset
System Features
3.3 V to 5 V
2.5 V to 5 V
Hardware or
I2C/SPI
Control Data
Performance
Internal
Oscillator
External
Mute Control
Left and
Right Mute
Controls
Selectable
Interpolation
Filter
∆Σ Modulator
Switched Capacitor
DAC and Filter
Left
Differential
Output
Selectable
Interpolation
Filter
∆Σ Modulator
Switched Capacitor
DAC and Filter
Right
Differential
Output
High Pass Filter &
DC Offset Calibration
Low-Latency
Anti-Alias Filter
Multibit
Oversampling
ADC
Left Input
High Pass Filter &
DC Offset Calibration
Low-Latency
Anti-Alias Filter
Multibit
Oversampling
ADC
Right Input
Copyright © Cirrus Logic, Inc. 2005
(All Rights Reserved)
AUGUST '05
DS592F1
CS4271
Stand-Alone Mode Feature Set
General Description
! System Features
– Serial Audio Port Master or Slave Operation
– Internal Oscillator for Master Clock
The CS4271 is a high-performance, integrated audio
CODEC. The CS4271 performs stereo analog-to-digital
(A/D) and digital-to-analog (D/A) conversion of up to
24-bit serial values at sample rates up to 192 kHz.
! D/A Features
– Auto-mute on Static Samples
– 44.1 kHz 50/15 µs De-emphasis Available
– Selectable Serial Audio Interface Formats
"Left Justified up to 24-bit
"I2S up to 24-bit
The D/A offers a volume control that operates with a
1 dB step size. It incorporates selectable soft ramp and
zero crossing transition functions to eliminate clicks and
pops.
The D/A’s integrated digital mixing functions allow a variety of output configurations ranging from a channel
swap to a stereo-to-mono downmix.
! A/D Features
– Automatic Dithering for 16-bit Data
– High-pass Filter
– Selectable Serial Audio Interface Formats
"Left Justified up to 24-bit
"I2S up to 24-bit
Standard 50/15 µs de-emphasis is available for sampling rates of 32, 44.1, and 48 kHz for compatibility with
digital audio programs mastered using the 50/15 µs preemphasis technique.
Integrated level translators allow easy interfacing between the CS4271 and other devices operating over a
wide range of logic levels.
Software Mode Feature Set
! System Features
– Serial Audio Port Master or Slave Operation
– Internal Oscillator for Master Clock
– Internal Digital Loopback Available
! D/A Features
– Selectable Auto-mute
– Selectable Interpolation Filters
– Selectable 32-, 44.1-, and 48-kHz De-emphasis
Filters
– Configurable ATAPI Mixing Functions
– Configurable Volume and Muting Controls
– Selectable Serial Audio Interface Formats
"Left Justified up to 24-bit
"I2S up to 24-bit
"Right Justified 16, 18, 20, and 24-bit
! A/D Features
– Selectable Dithering for 16-bit Data
– Selectable High-pass Filter or DC Offset Calibration
– Selectable Serial Audio Interface Formats
"Left Justified up to 24-bit
"I2S up to 24-bit
An on-chip oscillator eliminates the need for an external
crystal oscillator circuit. This can reduce overall design
cost and conserve circuit board space. The CS4271 automatically uses the on-chip oscillator in the absence of
an applied master clock, making this feature easy to
use.
Independently addressable high-pass filters are available for the right and left channel of the A/D. This allows
the A/D to be used in a wide variety of applications
where one audio channel and one DC measurement
channel is desired.
The CS4271’s wide dynamic range, negligible distortion, and low noise make it ideal for applications such as
A/V receivers, DVD-R, CD-R, digital mixing consoles,
effects processors, set-top box systems, and automotive audio systems.
Ordering Information
Product
CS4271
CDB4271
2
Description
Package
Pb-Free
28-pin
TSSOP
YES
24-Bit, 192 kHz
Stereo Audio CODEC
CS4271 Evaluation Board
No
Grade
Temp Range
Commercial
-10° to +70° C
Automotive
-40° to +85° C
-
-
Container
Tube
Tape & Reel
Tube
Tape & Reel
-
Order #
CS4271-CZZ
CS4271-CZZR
CS4271-DZZ
CS4271-DZZR
CDB4271
DS592F1
CS4271
TABLE OF CONTENTS
1. PIN DESCRIPTIONS - SOFTWARE MODE ............................................................................. 5
2. PIN DESCRIPTIONS - STAND-ALONE MODE ....................................................................... 7
3. CHARACTERISTICS AND SPECIFICATIONS ........................................................................ 9
SPECIFIED OPERATING CONDITIONS ................................................................................. 9
ABSOLUTE MAXIMUM RATINGS ........................................................................................... 9
DAC ANALOG CHARACTERISTICS - COMMERCIAL GRADE............................................ 10
DAC ANALOG CHARACTERISTICS - AUTOMOTIVE GRADE ............................................ 11
DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE................ 12
ADC ANALOG CHARACTERISTICS - COMMERCIAL GRADE............................................ 14
ADC ANALOG CHARACTERISTICS - AUTOMOTIVE GRADE ............................................ 15
ADC DIGITAL FILTER CHARACTERISTICS......................................................................... 16
DC ELECTRICAL CHARACTERISTICS ................................................................................ 17
DIGITAL CHARACTERISTICS............................................................................................... 17
SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT................................................. 18
SWITCHING CHARACTERISTICS - I²C MODE CONTROL PORT....................................... 21
SWITCHING CHARACTERISTICS - SPI CONTROL PORT ................................................. 22
4. TYPICAL CONNECTION DIAGRAM ..................................................................................... 23
5. APPLICATIONS ..................................................................................................................... 24
5.1 Stand-Alone Mode ........................................................................................................... 24
5.1.1 Recommended Power-Up Sequence ................................................................. 24
5.1.2 Master/Slave Mode ............................................................................................. 24
5.1.3 System Clocking ................................................................................................. 24
5.1.3.1 Crystal Applications (XTI/XTO) ........................................................... 24
5.1.3.2 Clock Ratio Selection .......................................................................... 25
5.1.4 16-Bit Auto-Dither ............................................................................................... 26
5.1.5 Auto-Mute ........................................................................................................... 26
5.1.6 High Pass Filter ................................................................................................... 26
5.1.7 Interpolation Filter .............................................................................................. 26
5.1.8 Mode Selection & De-Emphasis ......................................................................... 26
5.1.9 Serial Audio Interface Format Selection ............................................................. 26
5.2 Control Port Mode ........................................................................................................... 27
5.2.1 Recommended Power-Up Sequence - Access to Control Port Mode ................ 27
5.2.2 Master / Slave Mode Selection ........................................................................... 27
5.2.3 System Clocking ................................................................................................. 27
5.2.3.1 Crystal Applications (XTI/XTO) ........................................................... 27
5.2.3.2 Clock Ratio Selection .......................................................................... 28
5.2.4 Internal Digital Loopback .................................................................................... 30
5.2.5 Dither for 16-Bit Data .......................................................................................... 30
5.2.6 Auto-Mute ........................................................................................................... 30
5.2.7 High Pass Filter and DC Offset Calibration ......................................................... 30
5.2.8 Interpolation Filter .............................................................................................. 31
5.2.9 De-Emphasis ...................................................................................................... 31
5.2.10 Oversampling Modes ........................................................................................ 31
5.3 De-Emphasis Filter .......................................................................................................... 31
5.4 Analog Connections ........................................................................................................ 32
5.4.1 Input Connections ............................................................................................... 32
5.4.2 Output Connections ............................................................................................ 33
5.5 Mute Control .................................................................................................................... 34
5.6 Synchronization of Multiple Devices ................................................................................ 34
5.7 Grounding and Power Supply Decoupling ....................................................................... 34
6. CONTROL PORT INTERFACE .............................................................................................. 35
DS592F1
3
CS4271
6.1 SPI Mode ......................................................................................................................... 35
6.2 I²C Mode .......................................................................................................................... 36
7. REGISTER QUICK REFERENCE .......................................................................................... 37
8. REGISTER DESCRIPTION .................................................................................................... 38
8.1 Mode Control 1 - Address 01h ......................................................................................... 38
8.1.1 Functional Mode (Bits 7:6) .................................................................................. 38
8.1.2 Ratio Select (Bits 5:4) ......................................................................................... 38
8.1.3 Master / Slave Mode (Bit 3) ................................................................................. 38
8.1.4 DAC Digital Interface Format (Bits 2:0) ............................................................... 38
8.2 DAC Control - Address 02h ............................................................................................. 39
8.2.1 Auto-Mute (Bit 7) ................................................................................................. 39
8.2.2 Interpolation Filter Select (Bit 6) .......................................................................... 39
8.2.3 De-Emphasis Control (Bits 5:4) ........................................................................... 39
8.2.4 Soft Volume Ramp-Up After Error (Bit 3) ............................................................ 40
8.2.5 Soft Ramp-Down Before Filter Mode Change (Bit 2) .......................................... 40
8.2.6 Invert Signal Polarity (Bits 1:0) ............................................................................ 40
8.3 DAC Volume & Mixing Control - Address 03h ................................................................. 40
8.3.1 Channel B Volume = Channel A Volume (Bit 6) ................................................. 40
8.3.2 Soft Ramp or Zero Cross Enable (Bits 5:4) ......................................................... 40
8.3.3 ATAPI Channel Mixing and Muting (Bits 3:0) ...................................................... 41
8.4 DAC Channel A Volume Control - Address 04h .............................................................. 42
8.5 DAC Channel B Volume Control - Address 05h .............................................................. 42
8.5.1 Mute (Bit 7) .......................................................................................................... 42
8.5.2 Volume Control (Bits 6:0) .................................................................................... 42
8.6 ADC Control - Address 06h ............................................................................................. 43
8.6.1 Dither for 16-Bit Data (Bit 5) ................................................................................ 43
8.6.2 ADC Digital Interface Format (Bit 4) .................................................................... 43
8.6.3 ADC Channel A & B Mute (Bits 3:2) .................................................................... 43
8.6.4 Channel A & B High Pass Filter Disable (Bits 1:0) .............................................. 43
8.7 Mode Control 2 - Address 07h ......................................................................................... 43
8.7.1 Digital Loopback (Bit 4) ....................................................................................... 43
8.7.2 AMUTEC = BMUTEC (Bit 3) ............................................................................... 43
8.7.3 Freeze (Bit 2) ...................................................................................................... 44
8.7.4 Control Port Enable (Bit 1) .................................................................................. 44
8.7.5 Power Down (Bit 0) ............................................................................................. 44
8.8 Chip ID - Register 08h ..................................................................................................... 44
8.8.1 Chip ID (Bits 7:4) ................................................................................................. 44
8.8.2 Chip Revision (Bits 3:0) ....................................................................................... 44
9. PARAMETER DEFINITIONS .................................................................................................. 45
10. PACKAGE DIMENSIONS ..................................................................................................... 46
11. APPENDIX ............................................................................................................................ 47
4
DS592F1
CS4271
1.
PIN DESCRIPTIONS - SOFTWARE MODE
DS592F1
XTO
1
28
BMUTEC
XTI
2
27
AOUTB-
MCLK
3
26
AOUTB+
LRCK
4
25
AOUTA+
SCLK
5
24
AOUTA-
SDOUT
6
23
AMUTEC
SDIN
7
22
FILT+
DGND
8
21
AGND
VD
9
20
VA
VL
10
19
VQ3
SCL/CCLK
11
18
AINB
SDA/CDIN
12
17
AINA
AD0/CS
13
16
VQ2
RST
14
15
VQ1
28-Pin TSSOP
5
CS4271
Pin Name
XTO
XTI
#
1,2
Pin Description
Crystal Connections (Input/Output) - I/O pins for an external crystal which may be used to generate
MCLK. See “Crystal Applications (XTI/XTO)” on page 24 or “Crystal Applications (XTI/XTO)” on page 27.
MCLK
3
Master Clock (Input/Output) -Clock source for the delta-sigma modulators. See “Crystal Applications
(XTI/XTO)” on page 24 or “Crystal Applications (XTI/XTO)” on page 27.
LRCK
4
Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the
serial audio data line.
SCLK
5
Serial Clock (Input/Output) - Serial clock for the serial audio interface.
SDOUT
6
Serial Audio Data Output (Output) - Output for two’s complement serial audio data.
SDIN
7
Serial Audio Data Input (Input) - Input for two’s complement serial audio data.
DGND
8
Digital Ground (Input) - Ground reference for the internal digital section.
VD
9
Digital Power (Input) - Positive power for the internal digital section.
VL
10
Logic Power (Input) - Positive power for the digital input/output interface.
SCL/CCLK
11
Serial Control Port Clock (Input) - Serial clock for the serial control port.
SDA/CDIN
12
Serial Control Data (Input/Output) - SDA is a data I/O in I²C mode. CDIN is the input data line for the
control port interface in SPI mode.
AD0/CS
13
Address Bit 0 (I²C) / Control Port Chip Select (SPI) (Input) - AD0 is a chip address pin in I²C mode; CS
is the chip select signal for SPI format.
RST
14
Reset (Input) - The device enters a low power mode when this pin is driven low.
VQ1
15
Quiescent Voltage (Output) - Filter connection for internal quiescent reference voltage.
VQ2
16
Quiescent Voltage (Input) - Connection for internal quiescent reference voltage.
AINA
AINB
17, Analog Input (Input) - The full scale input level is specified in the ADC Analog Characteristics specifica18 tion table.
VQ3
19
Quiescent Voltage (Input) - Connection for internal quiescent reference voltage.
VA
20
Analog Power (Input) - Positive power for the internal analog section.
AGND
21
Analog Ground (Input) - Ground reference for the internal analog section.
FILT+
22
Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits.
AMUTEC
23
Channel A Mute Control (Output) - This pin is active during power-up initialization, reset, muting, when
master clock to left/right clock frequency ratio is incorrect, or power-down.
AOUTAAOUTA+
AOUTB+
AOUTB-
24,
25, Differential Analog Audio Output (Output) - The full scale differential output level is specified in the
26, DAC Analog Characteristics specification table.
27
BMUTEC
28
6
Channel B Mute Control (Output) - This pin is active during power-up initialization, reset, muting, when
master clock to left/right clock frequency ratio is incorrect, or power-down.
DS592F1
CS4271
2.
PIN DESCRIPTIONS - STAND-ALONE MODE
DS592F1
XTO
1
28
BMUTEC
XTI
2
27
AOUTB-
MCLK
3
26
AOUTB+
LRCK
4
25
AOUTA+
SCLK
5
24
AOUTA-
SDOUT (M/S)
6
23
AMUTEC
SDIN
7
22
FILT+
DGND
8
21
AGND
VD
9
20
VA
VL
10
19
VQ3
M0
11
18
AINB
M1
12
17
AINA
I2S/LJ
13
16
VQ2
RST
14
15
VQ1
28-Pin TSSOP
7
CS4271
Pin Name
XTO
XTI
#
Pin Description
Crystal Connections (Input/Output) - I/O pins for an external crystal which may be used to generate the
1,2 master clock. See “Crystal Applications (XTI/XTO)” on page 24 or “Crystal Applications (XTI/XTO)” on
page 27.
MCLK
3
Master Clock (Input/Output) -Clock source for the delta-sigma modulators. See “Crystal Applications
(XTI/XTO)” on page 24 or “Crystal Applications (XTI/XTO)” on page 27.
LRCK
4
Left Right Clock (Input/Output) - Determines which channel, Left or Right, is currently active on the
serial audio data line.
SCLK
5
Serial Clock (Input/Output) - Serial clock for the serial audio interface.
SDOUT
(M/S)
6
Serial Audio Data Output (Output) - Output for two’s complement serial audio data. This pin must be
pulled-up or pulled-down to select Master or Slave Mode. See “Master/Slave Mode” on page 24.
SDIN
7
Serial Audio Data Input (Input) - Input for two’s complement serial audio data.
DGND
8
Digital Ground (Input) - Ground reference for the internal digital section.
VD
9
Digital Power (Input) - Positive power for the internal digital section.
VL
10
Logic Power (Input) - Positive power for the digital input/output interface.
M0
11
Mode Select 0 (Input) - In conjunction with M1, selects operating mode. Functionality is described in the
Hardware Mode Speed Configuration table.
M1
12
Mode Select 1 (Input) - In conjunction with M0, selects operating mode. Functionality is described in the
Hardware Mode Speed Configuration table.
I2S/LJ
13
Serial Audio Interface Select (Input) - Selects either the left-justified or I2S format for the Serial Audio
Interface.
RST
14
Reset (Input) - The device enters a low power mode when this pin is driven low.
VQ1
15
Quiescent Voltage (Output) - Filter connection for internal quiescent reference voltage.
VQ2
16
Quiescent Voltage (Input) - Connection for internal quiescent reference voltage.
AINA
AINB
17, Analog Input (Input) - The full scale input level is specified in the ADC Analog Characteristics specifica18 tion table.
VQ3
19
Quiescent Voltage (Input) - Connection for internal quiescent reference voltage.
VA
20
Analog Power (Input) - Positive power for the internal analog section.
AGND
21
Analog Ground (Input) - Ground reference for the internal analog section.
FILT+
22
Positive Voltage Reference (Output) - Positive reference voltage for the internal sampling circuits.
AMUTEC
23
Channel A Mute Control (Output) - This pin is active during power-up initialization, reset, muting, when
master clock to left/right clock frequency ratio is incorrect, or power-down.
AOUTAAOUTA+
AOUTB+
AOUTB-
24,
25, Differential Analog Audio Output (Output) - The full scale differential output level is specified in the
26, Analog Characteristics specification table.
27
BMUTEC
28
8
Channel B Mute Control (Output) - This pin is active during power-up initialization, reset, muting, when
master clock to left/right clock frequency ratio is incorrect, or power-down.
DS592F1
CS4271
3.
CHARACTERISTICS AND SPECIFICATIONS
(All Min/Max characteristics and specifications are guaranteed over the Specified Operating Conditions. Typical
performance characteristics and specifications are derived from measurements taken at nominal supply voltages
and TA = 25°C.)
SPECIFIED OPERATING CONDITIONS (AGND = 0 V; all voltages with respect to ground.)
Parameters
DC Power Supplies:
Positive Analog
Positive Digital
Positive Logic
Ambient Operating Temperature (Power Applied)
Commercial Grade
Automotive Grade
Symbol
VA
VD
VL
Min
4.75
3.1
2.37
Nom
5.0
3.3
3.3
Max
5.25
5.25
5.25
Units
V
V
V
TA
-10
-40
-
+70
+85
°C
°C
ABSOLUTE MAXIMUM RATINGS (GND = 0 V, All voltages with respect to ground.) (Note 1)
Parameter
Symbol
Min
Typ
Max
Units
Analog
Logic
Digital
VA
VL
VD
-0.3
-0.3
-0.3
-
+6.0
+6.0
+6.0
V
V
V
(Note 2)
Iin
-
-
±10
mA
Analog Input Voltage
VIN
GND-0.3
-
VA+0.3
V
Digital Input Voltage
DC Power Supplies:
Input Current
VIND
-0.3
-
VL+0.3
V
Ambient Operating Temperature (Power Applied)
TA
-50
-
+95
°C
Storage Temperature
Tstg
-65
-
+150
°C
Notes: 1. Operation beyond these limits may result in permanent damage to the device.
Normal operation is not guaranteed at these extremes.
2. Any pin except supplies. Transient currents of up to ±100 mA on the analog input pins will not cause
SCR latch-up.
DS592F1
9
CS4271
DAC ANALOG CHARACTERISTICS - COMMERCIAL GRADE
Parameter
Symbol
(Notes 3 to 7)
Min
Typ
Max
Unit
108
105
-
114
111
94
-
dB
dB
dB
-
-100
-91
-51
-94
-45
dB
dB
dB
-
114
-
dB
-
100
-
dB
-
0.1
-
dB
-
100
-
ppm/°C
VFS
0.91xVA
0.96xVA
1.01xVA
Vpp
Zout
-
100
-
Ω
Minimum AC-Load Resistance
RL
-
3
-
kΩ
Maximum Load Capacitance
CL
-
100
-
pF
Dynamic Performance
Dynamic Range
24-Bits
16-Bits
Total Harmonic Distortion + Noise
A-Weighted
unweighted
unweighted
0 dB THD+N
-20 dB
-60 dB
Idle Channel Noise / Signal-to-Noise Ratio
Interchannel Isolation
(1 kHz)
DC Accuracy
Interchannel Gain Mismatch
ICGM
Gain Drift
Analog Output Characteristics and Specifications
Full Scale Differential Output Voltage
Output Resistance
(note 7)
Notes: 3. One-half LSB of Triangular PDF dither is added to data.
4. Performance measurements taken with a full-scale 997 Hz sine wave under Test load RL = 3 kΩ, CL =
10 pF
5. Measurement bandwidth is 10 Hz to 20 kHz.
6. Logic “0” = GND = 0V; Logic “1” = VL; VL = VA unless otherwise noted.
7. VFS is tested under load RL but does not include attenuation due to ZOUT
10
DS592F1
CS4271
DAC ANALOG CHARACTERISTICS - AUTOMOTIVE GRADE
Parameter
Symbol
(Notes 3 to 7)
Min
Typ
Max
Unit
106
103
-
114
111
94
-
dB
dB
dB
-
-100
-91
-51
-92
-43
dB
dB
dB
-
114
-
dB
-
100
-
dB
-
0.1
-
dB
-
100
-
ppm/°C
VFS
0.91xVA
0.96xVA
1.01xVA
Vpp
Zout
-
100
-
Ω
Minimum AC-Load Resistance
RL
-
3
-
kΩ
Maximum Load Capacitance
CL
-
100
-
pF
Dynamic Performance
Dynamic Range
24-Bits
16-Bits
Total Harmonic Distortion + Noise
A-Weighted
unweighted
unweighted
0 dB THD+N
-20 dB
-60 dB
Idle Channel Noise / Signal-to-Noise Ratio
Interchannel Isolation
(1 kHz)
DC Accuracy
Interchannel Gain Mismatch
ICGM
Gain Drift
Analog Output Characteristics and Specifications
Full Scale Differential Output Voltage
Output Resistance
DS592F1
(note 7)
11
CS4271
DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE
(Note 12)
Parameter
Single Speed Mode - 48 kHz
Passband (Note 9)
Frequency Response 10 Hz to 20 kHz
StopBand
StopBand Attenuation
Group Delay
De-emphasis Error (Note 11)
(Relative to 1kHz)
Double Speed Mode - 96 kHz
Passband (Note 9)
Frequency Response 10 Hz to 20 kHz
StopBand
StopBand Attenuation
Group Delay
Quad Speed Mode - 192 kHz
Passband (Note 9)
Frequency Response 10 Hz to 20 kHz
StopBand
StopBand Attenuation
Group Delay
12
to -0.01 dB corner
to -3 dB corner
(Note 10)
Fs = 32 kHz
Fs = 44.1 kHz
Fs = 48 kHz
to -0.01 dB corner
to -3 dB corner
(Note 10)
to -0.01 dB corner
to -3 dB corner
(Note 10)
Min
Fast Roll-Off
Typ
Max
Unit
0
0
-0.01
.547
90
-
12/Fs
-
.454
.499
+0.01
±0.23
±0.14
±0.09
Fs
Fs
dB
Fs
dB
s
dB
dB
dB
0
0
-0.01
.583
80
-
4.6/Fs
.430
.499
0.01
-
Fs
Fs
dB
Fs
dB
s
0
0
-0.01
.635
90
-
4.7/Fs
.105
.490
0.01
-
Fs
Fs
dB
Fs
dB
s
DS592F1
CS4271
DAC COMBINED INTERPOLATION & ON-CHIP ANALOG FILTER RESPONSE
(cont) (Note 12)
Parameter
Single Speed Mode - 48 kHz
Passband (Note 9)
Frequency Response 10 Hz to 20 kHz
StopBand
StopBand Attenuation
Group Delay
De-emphasis Error (Note 11)
(Relative to 1 kHz)
Double Speed Mode - 96 kHz
Passband (Note 9)
Frequency Response 10 Hz to 20 kHz
StopBand
StopBand Attenuation
Group Delay
Quad Speed Mode - 192 kHz
Passband (Note 9)
Frequency Response 10 Hz to 20 kHz
StopBand
StopBand Attenuation
Group Delay
Slow Roll-Off (Note 8)
Min
Typ
Max
to -0.01 dB corner
to -3 dB corner
(Note 10)
Fs = 32 kHz
Fs = 44.1 kHz
Fs = 48 kHz
to -0.01 dB corner
to -3 dB corner
(Note 10)
to -0.01 dB corner
to -3 dB corner
(Note 10)
Unit
0
0
-0.01
.583
64
-
6.5/Fs
-
0.417
0.499
+0.01
±0.23
±0.14
±0.09
Fs
Fs
dB
Fs
dB
s
dB
dB
dB
0
0
-0.01
.792
70
-
3.9/Fs
.296
.499
0.01
-
Fs
Fs
dB
Fs
dB
s
0
0
-0.01
.868
75
-
4.2/Fs
.104
.481
0.01
-
Fs
Fs
dB
Fs
dB
s
Notes: 8. Slow Roll-Off interpolation filter is only available in control port mode.
9. Response is clock dependent and will scale with Fs. Note that the response plots (Figures 21 to 44) have
been normalized to Fs and can be de-normalized by multiplying the X-axis scale by Fs.
10. Single and Double Speed Mode Measurement Bandwidth is from stopband to 3 Fs.
Quad Speed Mode Measurement Bandwidth is from stopband to 1.34 Fs.
11. De-emphasis is available only in Single Speed Mode; Only 44.1 kHz De-emphasis is available in StandAlone Mode.
12. Plots of this data are contained in the “Appendix” on page 47. See Figure 21 through Figure 44.
DS592F1
13
CS4271
ADC ANALOG CHARACTERISTICS - COMMERCIAL GRADE
Measurement Bandwidth is 10 Hz to 20 kHz unless otherwise specified. Input is 1 kHz sine wave.
Parameter
Fs = 48 kHz
A-weighted
unweighted
Total Harmonic Distortion + Noise
(Note 13)
-1 dB
-20 dB
-60 dB
Double Speed Mode
Fs = 96 kHz
Dynamic Range
A-weighted
unweighted
40kHz bandwidth unweighted
Total Harmonic Distortion + Noise
(Note 13)
-1 dB
-20 dB
-60 dB
40kHz bandwidth
-1 dB
Quad Speed Mode
Fs = 192 kHz
Dynamic Range
A-weighted
unweighted
40kHz bandwidth unweighted
Total Harmonic Distortion + Noise
(Note 13)
-1 dB
-20 dB
-60 dB
40kHz bandwidth
-1 dB
Dynamic Performance for All Modes
Interchannel Isolation
Interchannel Phase Deviation
DC Accuracy
Interchannel Gain Mismatch
Gain Error
Gain Drift
Offset Error
HPF enabled
HPF disabled
Analog Input Characteristics
Full-scale Input Voltage
Input Impedance
Symbol
Single Speed Mode
Dynamic Range
Min
Typ
Max
Unit
102
99
108
105
-
dB
dB
-
-98
-85
-45
-92
-
dB
dB
dB
102
99
-
108
105
102
-
dB
dB
dB
-
-98
-85
-45
-95
-92
-
dB
dB
dB
dB
102
99
-
108
105
102
-
dB
dB
dB
-
-98
-85
-45
-95
-92
-
dB
dB
dB
dB
-
110
0.0001
-
dB
Degree
-
-
-
0.1
±100
0
100
-
dB
%
ppm/°C
LSB
LSB
0.51xVA
18
0.565xVA
-
0.62xVA
-
Vpp
kΩ
THD+N
THD+N
THD+N
±5
Notes: 13. Referred to the typical full-scale input voltage.
14
DS592F1
CS4271
ADC ANALOG CHARACTERISTICS - AUTOMOTIVE GRADE
Measurement Bandwidth is 10 Hz to 20 kHz unless otherwise specified. Input is 1 kHz sine wave.)
Parameter
Fs = 48 kHz
A-weighted
unweighted
Total Harmonic Distortion + Noise
(Note 14)
-1 dB
-20 dB
-60 dB
Double Speed Mode
Fs = 96 kHz
Dynamic Range
A-weighted
unweighted
40kHz bandwidth unweighted
Total Harmonic Distortion + Noise
(Note 14)
-1 dB
-20 dB
-60 dB
40kHz bandwidth
-1 dB
Quad Speed Mode
Fs = 192 kHz
Dynamic Range
A-weighted
unweighted
40kHz bandwidth unweighted
Total Harmonic Distortion + Noise
(Note 14)
-1 dB
-20 dB
-60 dB
40kHz bandwidth
-1 dB
Dynamic Performance for All Modes
Interchannel Isolation
Interchannel Phase Deviation
DC Accuracy
Interchannel Gain Mismatch
Gain Error
Gain Drift
Offset Error
HPF enabled
HPF disabled
Analog Input Characteristics
Full-scale Input Voltage
Input Impedance
Symbol
Single Speed Mode
Dynamic Range
Min
Typ
Max
Unit
101
98
108
105
-
dB
dB
-
-98
-85
-45
-91
-
dB
dB
dB
101
98
-
108
105
102
-
dB
dB
dB
-
-98
-85
-45
-95
-91
-
dB
dB
dB
dB
101
98
-
108
105
102
-
dB
dB
dB
-
-98
-85
-45
-95
-91
-
dB
dB
dB
dB
-
110
0.0001
-
dB
Degree
-
-
-
0.1
±100
0
100
-
dB
%
ppm/°C
LSB
LSB
0.51xVA
18
0.565xVA
-
0.62xVA
-
Vpp
kΩ
THD+N
THD+N
THD+N
±5
Notes: 14. Referred to the typical full-scale input voltage.
DS592F1
15
CS4271
ADC DIGITAL FILTER CHARACTERISTICS
(Note 17)
Parameter
Symbol
Min
Typ
Max
Unit
0
-
0.47
Fs
-
-
±0.035
dB
0.58
-
-
Fs
Single Speed Mode
Passband
(-0.1 dB).
(Note 15)
Passband Ripple.
Stopband.
(Note 15)
Stopband Attenuation.
-95
-
-
dB
-
12/Fs
-
s
(Note 15)
0
-
0.45
Fs
-
-
±0.035
dB
(Note 15)
0.68
-
-
Fs
-92
-
-
dB
-
9/Fs
-
s
0
-
0.24
Fs
-
-
±0.035
dB
0.78
-
-
Fs
Group Delay.
tgd
Double Speed Mode
Passband
(-0.1 dB).
Passband Ripple.
Stopband.
Stopband Attenuation.
Group Delay.
tgd
Quad Speed Mode
Passband
(-0.1 dB).
(Note 15)
Passband Ripple.
Stopband.
(Note 15)
Stopband Attenuation.
Group Delay.
tgd
-97
-
-
dB
-
5/Fs
-
s
-
1
20
-
Hz
Hz
-
10
-
Deg
-
-
0
dB
High Pass Filter Characteristics
Frequency Response
Phase Deviation
-3.0 dB.
-0.13 dB.
(Note 16)
@ 20 Hz.
(Note 16)
Passband Ripple.
Filter Settling Time.
105/Fs
s
Notes: 15. The filter frequency response scales precisely with Fs.
16. Response shown is for Fs equal to 48 kHz. Filter characteristics scale with Fs.
17. Plots of this data are contained in the “Appendix” on page 47. See Figure 45 through Figure 56.
16
DS592F1
CS4271
DC ELECTRICAL CHARACTERISTICS
(GND = 0 V, all voltages with respect to ground. MCLK=12.288 MHz; Master Mode)
Parameter
Symbol
Min
Typ
Max
Unit
VA
VL,VD = 5 V
VL,VD = 3.3 V
IA
ID
ID
-
45
41.5
24
53
49
28
mA
mA
mA
VA
VL,VD=5 V
IA
ID
-
0.025
1.76
-
mA
mA
VL, VD=5 V
VL, VD = 3.3 V
(Power-Down Mode)
-
-
433
305
9
510
358
-
mW
mW
mW
PSRR
-
60
-
dB
VQ
-
0.48xVA
-
VDC
Maximum DC Current Source/Sink from VQ
-
1
-
µA
VQ Output Impedance
-
25
-
kΩ
-
VA
-
VDC
Power Supply
Power Supply Current
(Normal Operation)
Power Supply Current
(Power-Down Mode)(Note 18)
Power Consumption
(Normal Operation)
Power Supply Rejection Ratio (1 kHz)
(Note 19)
Quiescent Voltage
Nominal Quiescent Voltage
FILT+
FILT+ Nominal Voltage
FILT+
MUTEC
MUTEC Low-Level Output Voltage
-
0
-
V
MUTEC High-Level Output Voltage
-
VA
-
V
Maximum MUTEC Drive Current
-
3
-
mA
Notes: 18. Power Down Mode is defined as RST = Low with all clocks and data lines held static.
19. Valid with the recommended capacitor values on FILT+ and VQ as shown in the Typical Connection
Diagram.
DIGITAL CHARACTERISTICS
Parameter
Symbol
Min
Typ
Max
Units
High-Level Input Voltage
(% of VL)
VIH
70%
-
-
V
Low-Level Input Voltage
(% of VL)
VIL
-
-
30%
V
High-Level Output Voltage at Io = 2 mA
VOH
VL - 1.0
-
-
V
Low-Level Output Voltage at Io = 2 mA
VOL
-
-
0.4
V
Iin
-
-
±10
µA
Input Leakage Current
DS592F1
17
CS4271
SWITCHING CHARACTERISTICS - SERIAL AUDIO PORT (Logic "0" = GND = 0 V;
Logic "1" = VL, CL = 20 pF)
Parameter
Sample Rate
Single Speed Mode
Double Speed Mode
Quad Speed Mode
Symbol
Min
Typ
Max
Unit
Fs
Fs
Fs
4
50
100
-
50
100
200
kHz
kHz
kHz
MCLK Specifications
MCLK Frequency
(note 20)
Stand-Alone Mode
Control Port Mode
fmclk
fmclk
1.024
1.024
-
25.600
51.200
MHz
MHz
MCLK Input Pulse Width High/Low
(note 20)
Stand-Alone Mode
Control Port Mode
tclkhl
tclkhl
16
8
-
-
ns
ns
45
50
55
%
-
50
-
%
MCLK Output Duty Cycle
Master Mode
LRCK Duty Cycle
SCLK Duty Cycle
-
50
-
%
SCLK falling to LRCK edge
tslr
-10
-
10
ns
SCLK falling to SDOUT valid
tsdo
0
-
32
ns
SDIN valid to SCLK rising setup time
tsdis
16
-
-
ns
SCLK rising to SDIN hold time
tsdih
20
-
-
ns
40
50
60
%
Slave Mode
LRCK Duty Cycle
SCLK Period
(note 20)
Single Speed Mode
tsclkw
1
--------------------( 128 )Fs
-
-
s
Double Speed Mode
tsclkw
1
--------------------( 128 )Fs
-
-
s
Quad Speed Mode
tsclkw
1
-----------------( 64 )Fs
-
-
s
SCLK Pulse Width High
tsclkh
30
-
-
ns
SCLK Pulse Width Low
tsclkl
48
-
-
ns
SCLK falling to LRCK edge
tslr
-10
-
10
ns
SCLK falling to SDOUT valid
tsdo
0
-
32
ns
SDIN valid to SCLK rising setup time
tsdis
16
-
-
ns
SCLK rising to SDIN hold time
tsdih
20
-
-
ns
fosc
16.384
-
25.600
MHz
Crystal Oscillator Specifications (XTI/XTO)
Crystal Frequency Range
Notes: 20. In Control Port Mode, the Ratio[1:0] bits must be configured according to tables 8 and 9 on
pages 28 and 29.
18
DS592F1
CS4271
LRCK
O utput
t
slr
SCLK
O utput
t
sdo
SDO UT
t
t
sdis
sdih
SDIN
Figure 1. Master Mode Serial Audio Port Timing
LRCK
Input
t
t
sclkh
slr
t
sclkl
SCLK
Input
t
t
sdo
sclkw
SDOUT
t
sdis
t
sdih
SDIN
Figure 2. Slave Mode Serial Audio Port Timing
DS592F1
19
CS4271
Left Channel
LRCK
Right Channel
SCLK
SDATA
MSB -1 -2 -3 -4 -5
+5 +4 +3 +2 +1 LSB
MSB -1 -2 -3 -4
+5 +4 +3 +2 +1 LSB
Figure 3. Format 0, Left Justified up to 24-Bit Data
Left Channel
LRCK
Right Channel
SCLK
SDATA
MSB -1 -2 -3 -4 -5
+5 +4 +3 +2 +1 LSB
MSB -1 -2 -3 -4
+5 +4 +3 +2 +1 LSB
Figure 4. Format 1, I²S up to 24-Bit Data
LRCK
R ight Channel
Left Channel
SCLK
SDATA
LSB
MSB-1 -2 -3 -4 -5 -6
+6 +5 +4 +3 +2 +1 LSB
MSB -1 -2 -3 -4 -5 -6
+6 +5 +4 +3 +2 +1 LSB
32 clo cks
Figure 5. Format 2, Right Justified 16-Bit Data. (Available in Control Port Mode only)
Format 3, Right Justified 24-Bit Data. (Available in Control Port Mode only)
Format 4, Right Justified 20-Bit Data. (Available in Control Port Mode only)
Format 5, Right Justified 18-Bit Data. (Available in Control Port Mode only)
20
DS592F1
CS4271
SWITCHING CHARACTERISTICS - I²C MODE CONTROL PORT
(Inputs: logic 0 = AGND, logic 1 = VL)
Parameter
Symbol
Min
Max
Unit
SCL Clock Frequency.
fscl
-
100
KHz
RST Rising Edge to Start.
tirs
500
-
ns
Bus Free Time Between Transmissions.
tbuf
4.7
-
µs
Start Condition Hold Time (prior to first clock pulse).
thdst
4.0
-
µs
Clock Low time.
tlow
4.7
-
µs
Clock High Time.
thigh
4.0
-
µs
Setup Time for Repeated Start Condition.
tsust
4.7
-
µs
thdd
0
-
µs
tsud
250
-
ns
Rise Time of Both SDA and SCL Lines.
tr
-
1
µs
Fall Time of Both SDA and SCL Lines.
tf
-
300
ns
tsusp
4.7
-
µs
I²C Mode
SDA Hold Time from SCL Falling.
(Note 21)
SDA Setup time to SCL Rising.
Setup Time for Stop Condition.
Notes: 21. Data must be held for sufficient time to bridge the 300 ns transition time of SCL.
RST
t irs
Stop
Repeated
Start
Start
Stop
SDA
t buf
t
t high
t hdst
tf
hdst
t susp
SCL
t
low
t
hdd
t sud
t sust
tr
Figure 6. I²C Mode Control Port Timing
DS592F1
21
CS4271
SWITCHING CHARACTERISTICS - SPI CONTROL PORT
(Inputs: logic 0 = AGND, logic 1 = VL)
Parameter
Symbol
Min
Max
Unit
CCLK Clock Frequency.
fsclk
-
6
MHz
RST Rising Edge to CS Falling.
tsrs
500
-
ns
tspi
500
-
ns
CS High Time Between Transmissions.
tcsh
1.0
-
µs
CS Falling to CCLK Edge.
tcss
20
-
ns
CCLK Low Time.
tscl
82
-
ns
CCLK High Time.
tsch
82
-
ns
CDIN to CCLK Rising Setup Time.
tdsu
40
-
ns
SPI Mode
CCLK Edge to CS Falling.
(Note 22)
CCLK Rising to DATA Hold Time.
(Note 23)
tdh
15
-
ns
Rise Time of CCLK and CDIN.
(Note 24)
tr2
-
100
ns
Fall Time of CCLK and CDIN.
(Note 24)
tf2
-
100
ns
Notes: 22. tspi only needed before first falling edge of CS after RST rising edge. tspi = 0 at all other times.
23. Data must be held for sufficient time to bridge the transition time of CCLK.
24. For FSCK < 1 MHz
RST
t srs
CS
t spi t css
t scl
t sch
t csh
CCLK
t r2
t f2
CDIN
t dsu t
dh
Figure 7. SPI Control Port Timing
22
DS592F1
CS4271
4.
TYPICAL CONNECTION DIAGRAM
+5 V
* Only one must be used. See
"Grounding and Power Supply
Decoupling."
∗
5.1 Ω
0.1 µF
1 µF
0.1 µF
1 µF
*
+5 V to 3.3 V *
Not to exceed 1 µF.
VA
FILT+
47 µF
¤ See "Master/Slave Mode Selection".
VD
VL
+5 V to 2.5 V
0.1 µF
0.1 µF
AGND
1 µF ∗
CS4271
1 µF
¤ 47 kΩ
0.1 µF
VQ1
AD0 / CS (I2S/LJ)
SDA / CDIN (M1)
SCL / CCLK (M0)
Power Down
and Mode
Settings
(Control Port)
RST
40 pF
MCLK
SCLK
LRCK
AINA
AINB
Analog Input
Buffer
SDOUT (M/S)
SDIN
Audio Data
Processor
Timing Logic
&
Clock
AOUTA-
VQ2
VQ3
AMUTEC
AOUTA+
XTI
AOUTBBMUTEC
XTO
AOUTB+
**
Analog Conditioning
&
Mute
40 pF
** Optional. See "Crystal
Applications (XTI/XTO)".
DGND
Figure 8. CS4271 Typical Connection Diagram
DS592F1
23
CS4271
5. APPLICATIONS
5.1
Stand-Alone Mode
5.1.1
Recommended Power-Up Sequence
1) When using the CS4271 with an external MCLK, hold RST low until the power supply, MCLK, and LRCK are
stable. When using the CS4271 with internally generated MCLK, hold RST low until the power supply is stable.
2) Bring RST high. If the internally generated MCLK is being used, it will appear on the MCLK pin prior to 1 ms from
the release of RST.
5.1.2
Master/Slave Mode
The CS4271 supports operation in either Master Mode or Slave Mode.
In Master Mode, LRCK and SCLK are outputs and are synchronously generated on-chip. LRCK is equal to Fs and
SCLK is equal to 64x Fs.
In Slave Mode, LRCK and SCLK are inputs, requiring external generation that is synchronous to MCLK. It is recommended that SCLK be 64x Fs to maximize system performance.
In Stand-Alone Mode, the CS4271 will default to Slave Mode. Master Mode may be accessed by placing a 47 kΩ
pull-up to VL on the SDOUT (M/S) pin.
Configuration of clock ratios in each of these modes will be outlined in the Tables 3 and 4.
5.1.3
System Clocking
The CS4271 will operate at sampling frequencies from 4 kHz to 200 kHz. This range is divided into three speed
modes as shown in Table 1 below.
Table 1. Speed Modes
5.1.3.1
Mode
Sampling Frequency
Single Speed
4-50 kHz
Double Speed
50-100 kHz
Quad Speed
100-200 kHz
Crystal Applications (XTI/XTO)
An external crystal may be used in conjunction with the CS4271 to generate the master clock signal. To accomplish
this, a 20 pF fundamental mode parallel resonant crystal must be connected between the XTI and XTO pins as
shown in the Typical Connection Diagram on page 23. This crystal must oscillate at the frequency shown in Table 2.
In this configuration, MCLK is a buffered output and, as shown in the Typical Connection Diagram, nothing other
than the crystal and its load capacitors should be connected to XTI and XTO. The MCLK signal will appear on the
MCLK pin prior to 1 ms from the release of RST.
Table 2. Crystal Frequencies
Mode
Crystal Frequency
Single Speed
512 x Fs
Double Speed
256 x Fs
Quad Speed
128 x Fs
To operate the CS4271 with an externally generated MCLK signal, no crystal should be used, XTI should be connected to ground and XTO should be left unconnected. In this configuration, MCLK is an input and must be driven
externally with an appropriate speed clock.
24
DS592F1
CS4271
5.1.3.2
Clock Ratio Selection
Depending on the use of an external crystal, or whether the CS4271 is in Master or Slave Mode, different
MCKL/LRCK and SCLK/LRCK ratios may be used. These ratios are shown in the Tables 3 and 4 below.
Table 3. Clock Ratios - Stand Alone Mode With External Crystal
External Crystal Used, MCLK=Output
Master Mode
MCLK/LRCK
SCLK/LRCK
LRCK
Single Speed
256
64
Fs
Double Speed
128
64
Fs
Quad Speed
128
64
Fs
MCLK/LRCK
SCLK/LRCK
LRCK
Single Speed
256
32, 64, 128
Fs
Double Speed
128
32, 64
Fs
Quad Speed
128
32, 64
Fs
Slave Mode
Table 4. Clock Ratios - Stand Alone Mode Without External Crystal
External Crystal Not Used, MCLK=Input
Master Mode
MCLK/LRCK
SCLK/LRCK
LRCK
Single Speed
256
64
Fs
Double Speed
128
64
Fs
Quad Speed
64
32
Fs
SCLK/LRCK
LRCK
256
32, 64, 128
Fs
384
32, 48, 64, 96, 128
Fs
512
32, 64, 128
Fs
128
32, 64
Fs
192
32, 48, 64
Fs
256
32, 64
Fs
64
32
Fs
96
48
Fs
128
32, 64
Fs
Slave Mode
MCLK/LRCK
Single Speed
Double Speed
Quad Speed
DS592F1
25
CS4271
5.1.4
16-Bit Auto-Dither
The CS4271 will auto-configure to output properly dithered 16-bit data when placed in Slave Mode and a 32x SCLK
to LRCK ratio is used. In this configuration, one half of a bit of dither is added to the LSB of the 16-bit word. This
applies only to the serial audio output of the ADC and will not affect DAC performance. See Figure 9.
1 6 -B it W o rd
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
½ B it D ith e r
Figure 9. ADC 16-Bit Auto-Dither
5.1.5
Auto-Mute
The DAC output will mute following the reception of 8192 consecutive audio samples of static 0 or -1. A single sample of non-static data will release the mute. Detection and muting are done independently for each channel. The
common mode on the output will be retained and the Mute Control pin for that channel will go active during the mute
period.
5.1.6
High Pass Filter
The operational amplifiers in the input circuitry driving the CS4271 may generate a small DC offset into the ADC.
The CS4271 includes a high pass filter after the decimator to remove any DC offset which could result in recording
a DC level, possibly yielding "clicks" when switching between devices in a multichannel system.
In Stand-Alone Mode, the high pass filter continuously subtracts a measure of the DC offset from the output of the
decimation filter. This function cannot be disabled in Stand-Alone Mode.
5.1.7
Interpolation Filter
In Stand-Alone Mode, the fast roll-off interpolation filter is used.
Filter specifications can be found in Section 3. Plots of the data are contained in the “Appendix” on page 47.
5.1.8
Mode Selection & De-Emphasis
The sample rate, Fs, can be adjusted from 4 kHz to 200 kHz. In Stand-Alone Mode, the CS4271 must be set to the
proper mode via the mode pins, M1 and M0. De-emphasis, optimized for a 44.1 kHz sampling frequency, is available.
Table 5. CS4271 Stand-Alone Mode Control
Mode 1
0
0
1
1
5.1.9
Mode 0
0
1
0
1
Mode
Single Speed Mode
Single Speed Mode
Double Speed Mode
Quad Speed Mode
Sample Rate (Fs)
4 kHz - 50 kHz
4 kHz - 50 kHz
50 kHz - 100 kHz
100 kHz - 200 kHz
De-Emphasis
44.1 kHz
Off
Off
Off
Serial Audio Interface Format Selection
2
Either I S or left justified serial audio data format may be selected in Stand-Alone Mode. The selection will affect
both the input and output format. Placing a 10 kΩ pull-up to VL on the I2S/LJ pin will select the I2S format, while
placing a 10 kΩ pull-down to DGND on the I2S/LJ pin will select the left justified format.
26
DS592F1
CS4271
5.2
Control Port Mode
5.2.1
Recommended Power-Up Sequence - Access to Control Port Mode
1) When using the CS4271 with an external MCLK, hold RST low until the power supply, MCLK, and LRCK are
stable. When using the CS4271 with internally generated MCLK, hold RST low until the power supply is stable.
In this state, the Control Port is reset to its default settings.
2) Bring RST high. The device will remain in a low power state and the control port will be accessible. If internally
generated MCLK is being used, it will appear on the MCLK pin prior to 1 ms from the release of RST.
3) Write 03h to register 07h within 10 ms following the release of RST. This sets the Control Port Enable (CPEN)
and Power Down (PDN) bits, activating the Control Port and placing the part in power-down. When using the
CS4271 with internally generated MCLK, it is necessary to wait 1 ms following the release of RST before initiating this Control Port write.
4) The desired register settings can be loaded while keeping the PDN bit set.
5) Clear the PDN bit to initiate the power-up sequence. This power-up sequence requires approximately 85 µS.
5.2.2
Master / Slave Mode Selection
The CS4271 supports operation in either Master Mode or Slave Mode.
In Master Mode, LRCK and SCLK are outputs and are synchronously generated on-chip. LRCK is equal to Fs and
SCLK is equal to 64x Fs.
In Slave Mode, LRCK and SCLK are inputs, requiring external generation that is synchronous to MCLK. It is recommended that SCLK be 64x Fs to maximize system performance.
Configuration of clock ratios in each of these modes will be outlined in the Tables 8 and 9.
In Control Port Mode the CS4271 will default to Slave Mode. The user may change this default setting by changing
the status of the M/S bit in the Mode Control 1 register (01h).
5.2.3
System Clocking
The CS4271 will operate at sampling frequencies from 4 kHz to 200 kHz. This range is divided into three speed
modes as shown in Table 6 below.
Table 6. Speed Modes
Mode
5.2.3.1
Sampling Frequency
Single Speed
4-50 kHz
Double Speed
50-100 kHz
Quad Speed
100-200 kHz
Crystal Applications (XTI/XTO)
An external crystal may be used in conjunction with the CS4271 to generate the MCLK signal. To accomplish this,
a 20 pF fundamental mode parallel resonant crystal must be connected between the XTI and XTO pins as shown in
the Typical Connection Diagram on page 23. This crystal must oscillate at the frequency shown in Table 7. In this
configuration, MCLK is a buffered output and, as shown in the Typical Connection Diagram, nothing other than the
crystal and its load capacitors should be connected to XTI and XTO. The MCLK signal will appear on the MCLK pin
prior to 1 ms from the release of RST.
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27
CS4271
Table 7. Crystal Frequencies
Mode
Crystal Frequency
Single Speed
512 x Fs
Double Speed
256 x Fs
Quad Speed
128 x Fs
To operate the CS4271 with an externally generated MCLK signal, no crystal should be used, XTI should be connected to ground and XTO should be left unconnected. In this configuration, MCLK is an input and must be driven
externally with an appropriate speed clock.
5.2.3.2
Clock Ratio Selection
Depending on the use of an external crystal, or whether the CS4271 is in Master or Slave Mode, different
MCKL/LRCK and SCLK/LRCK ratios may be used. These ratios as well as the Control Port Register Bits that must
be set in order to obtain them are shown in Tables 8 and 9 below.
Table 8. Clock Ratios - Control Port Mode With External Crystal
External Crystal Used, MCLK=Output
Master Mode
Single Speed
Double Speed
Quad Speed
MCLK/LRCK
SCLK/LRCK
LRCK
Ratio1 Bit
Ratio0 Bit
256
64
Fs
0
d25
512
64
Fs
1
d25
128
64
Fs
0
d25
256
64
Fs
1
d25
128
64
Fs
d25
d25
MCLK/LRCK
SCLK/LRCK
LRCK
Ratio1 Bit
Ratio0 Bit
256
32, 64, 128
Fs
0
d25
512
32, 64, 128
Fs
1
d25
128
32, 64
Fs
0
d25
256
32, 64
Fs
1
d25
128
32, 64
Fs
d25
d25
Slave Mode
Single Speed
Double Speed
Quad Speed
Notes: 25. For the Ratio1 and Ratio0 bits listed above, “d” indicates that any value may written.
28
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CS4271
Table 9. Clock Ratios - Control Port Mode Without External Crystal
External Crystal Not Used, MCLK=Input
Master Mode
Single Speed
Double Speed
Quad Speed
MCLK/LRCK
SCLK/LRCK
LRCK
Ratio1 Bit
Ratio0 Bit
256
64
Fs
0
0
384
64
Fs
0
1
512
64
Fs
1
0
768
64
Fs
1
1
128
64
Fs
0
0
192
64
Fs
0
1
256
64
Fs
1
0
384
64
Fs
1
1
64
32
Fs
0
0
96
32
Fs
0
1
128
64
Fs
1
0
192
64
Fs
1
1
Slave Mode
Single Speed
Double Speed
Quad Speed
MCLK/LRCK
SCLK/LRCK
LRCK
Ratio1 Bit
Ratio0 Bit
256
32, 64, 128
Fs
0
d26
384
32, 48, 64, 96, 128
Fs
0
d26
512
32, 64, 128
Fs
0
d26
768
32, 48, 64, 96, 128
Fs
1
d26
1024
32, 64, 128
Fs
1
d26
128
32, 64
Fs
0
d26
192
32, 48, 64
Fs
0
d26
256
32, 64
Fs
0
d26
384
32, 48, 64
Fs
1
d26
512
32, 64
Fs
1
d26
64
32
Fs
0
d26
96
48
Fs
0
d26
128
32, 64
Fs
0
d26
192
48
Fs
1
d26
256
32, 64
Fs
1
d26
Notes: 26. For the Ratio0 bit listed above, “d” indicates that any value may written.
DS592F1
29
CS4271
5.2.4
Internal Digital Loopback
In Control Port Mode, the CS4271 supports an internal digital loopback mode in which the output of the ADC is routed to the input of the DAC. This mode may be activated by setting the LOOP bit in the Mode Control 2 register (07h).
When this bit is set, the status of the DAC_DIF(2:0) bits in register 01h will be disregarded by the CS4271. Any
changes made to the DAC_DIF(2:0) bits while the LOOP bit is set will have no impact on operation until the LOOP
bit is released, at which time the Digital Interface Format of the DAC will operate according to the format selected in
the DAC_DIF(2:0) bits. While the LOOP bit is set, data will be present on the SDOUT pin in the format selected in
the ADC_DIF bit in register 06h.
5.2.5
Dither for 16-Bit Data
The CS4271 may be configured to properly dither for 16-bit data. To do this, the Dither16 bit in the ADC Control
Register (06h) must be set. When set, a half bit of dither is added to the least significant bit of the 16 most significant
bits of the data word. The remaining bits should be disregarded. See Figure 10. This function is useful when 16-bit
devices are downstream of the ADC. This bit should not be set when using word lengths greater than 16 bits.
It should be noted that this function is supported for all serial audio output formats, and may be activated in either
Master or Slave Mode.
16-Bit W ord
23
22
21
20
19
18
17
16
15
14
Disregard Contents
13
12
11
10
9
8
7
6
5
4
3
2
1
0
½ Bit Dither
Figure 10. Example of Dither for 16-Bit Data with 24-Bit Left Justified Format
5.2.6
Auto-Mute
The Auto-Mute function is controlled by the status of the AMUTE bit in the DAC Control register. When set, the DAC
output will mute following the reception of 8192 consecutive audio samples of static 0 or -1. A single sample of nonstatic data will release the mute. Detection and muting are done independently for each channel. Auto-Mute detection and muting can become dependent on either channel if the MUTECA=B function is enabled. The common mode
on the output will be retained and the Mute Control pin for that channel will become active during the mute period.
The muting function is effected, similar to volume control changes, by the Soft and ZeroCross bits in the DAC Volume and Mixing Control register. The AMUTE bit is set by default.
5.2.7
High Pass Filter and DC Offset Calibration
The operational amplifiers in the input circuitry driving the CS4271 may generate a small DC offset into the A/D converter. The CS4271 includes a high pass filter after the decimator to remove any DC offset which could result in
recording a DC level, possibly yielding "clicks" when switching between devices in a multichannel system.
The high pass filter continuously subtracts a measure of the DC offset from the output of the decimation filter. The
high pass filter can be independently enabled and disabled for channels A and B. If the HPFDisableA or HPFDisableB bit is set during normal operation, the current value of the DC offset for the corresponding channel is frozen
and this DC offset will continue to be subtracted from the conversion result. This feature makes it possible to perform
a system DC offset calibration by:
1) Running the CS4271 with the high pass filter enabled until the filter settles. See the Digital Filter Characteristics
for filter settling time.
2) Disabling the high pass filter and freezing the stored DC offset.
30
DS592F1
CS4271
A system calibration performed in this way will eliminate offsets anywhere in the signal path between the calibration
point and the CS4271.
5.2.8
Interpolation Filter
To accommodate the increasingly complex requirements of digital audio systems, the CS4271 incorporates selectable interpolation filters for each mode of operation. Fast and slow roll-off filters are available in each of Single, Double, and Quad Speed modes. These filters have been designed to accommodate a variety of musical tastes and
styles. The FILT_SEL bit in the DAC Control register (02h) is used to select which filter is used. By default, the fast
roll-off filter is selected.
Filter specifications can be found in Section 3. Plots of the data are contained in the “Appendix” on page 47.
5.2.9
De-Emphasis
Three de-emphasis modes are available via the Control Port. The available filters are optimized for 32 kHz,
44.1 kHz, and 48 kHz sampling rates. See Table 13 for de-emphasis selection in Control Port Mode.
5.2.10 Oversampling Modes
The CS4271 operates in one of three oversampling modes based on the input sample rate. Mode selection is determined by the M1 and M0 bits in the Mode Control 1 register. Single-Speed mode supports input sample rates up
to 50 kHz and uses a 128x oversampling ratio. Double-Speed mode supports input sample rates up to 100 kHz and
uses an oversampling ratio of 64x. Quad-Speed mode supports input sample rates up to 200 kHz and uses an oversampling ratio of 32x. See Table 11 for Control Port Mode settings.
5.3
De-Emphasis Filter
The CS4271 includes on-chip digital de-emphasis. Figure 11 shows the de-emphasis curve for Fs equal to 44.1 kHz.
The frequency response of the de-emphasis curve will scale proportionally with changes in sample rate, Fs. Please
see section 5.1.8 for the desired de-emphasis control for Stand-Alone mode and section 5.2.9 for control port mode.
The de-emphasis feature is included to accommodate audio recordings that utilize 50/15 µS pre-emphasis equalization as a means of noise reduction.
De-emphasis is only available in Single Speed Mode.
Gain
dB
T1=50 µs
0dB
T2 = 15 µs
-10dB
F1
3.183 kHz
F2
Frequency
10.61 kHz
Figure 11. De-Emphasis Curve
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CS4271
5.4
5.4.1
Analog Connections
Input Connections
The analog modulator samples the input at 6.144 MHz (MCLK=12.288 MHz). The digital filter will reject signals within the stopband of the filter. However, there is no rejection for input signals which are (n × 6.144 MHz) the digital
passband frequency, where n=0,1,2,... Refer to Figure 12 for a recommended analog input buffer that will attenuate
any noise energy at 6.144 MHz, in addition to providing the optimum source impedance for the modulators. The use
of capacitors which have a large voltage coefficient (such as general purpose ceramics) must be avoided since
these can degrade signal linearity. Figure 13 shows the full-scale analog input levels.
634 Ω
470 pF
-
AINL
10 µF
C0G
CS4271
91 Ω
AINA
2700 pF
C0G
+
10 kΩ
VQ2
-
VQ1
+
1 µF
0.1 µF
10 kΩ
AINR
10 µF
2700 pF
C0G
+
470 pF
91 Ω
VQ3
AINB
C0G
634 Ω
Figure 12. CS4271 Recommended Analog Input Buffer
CS4271
3.9 V
2.5 V
AINA
1.1 V
3.9 V
AINB
2.5 V
1.1 V
Full-Scale Input Level = 2.8 Vpp
Figure 13. Full-Scale Analog Input
32
DS592F1
CS4271
5.4.2
Output Connections
The recommended output filter configuration is shown in Figure 14. This filter configuration accounts for the normally
differing AC loads on the AOUT+ and AOUT- differential output pins. It also shows an AC coupling configuration
which minimizes the number of required AC coupling capacitors.
The CS4271 does not include phase or amplitude compensation for an external filter, and therefore the DAC system
phase and amplitude response will be dependent on the external analog circuitry. Figure 15 shows the full-scale analog output levels.
CS4271
2200 pF
4.99 kΩ
470 pF
C0G
AOUT-
4.42 kΩ
2.32 kΩ
AOUT+
715 Ω
1.33 kΩ
-
C0G
22 µF
+
1.5 nF
6.8 nF
560 Ω
Analog
Out
47 kΩ
C0G
1.50 kΩ
C0G
22 µF
Figure 14. CS4271 Recommended Analog Output Filter
CS4271
3.75 V
AOUT+
2.5 V
1.25 V
3.75 V
AOUT-
2.5 V
1.25 V
Full-Scale Output Level= (AIN+) - (AIN-)= 5 Vpp
Figure 15. Full-Scale Analog Output
DS592F1
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CS4271
5.5
Mute Control
The Mute Control pins become active during power-up initialization, reset, muting, if the MCLK to LRCK ratio is incorrect, and during power-down. The Auto-Mute function causes the MUTEC pin corresponding to an individual
channel to activate following the reception of 8192 consecutive audio samples of static 0 or -1 on the respective
channel. A single sample of non-zero data on this channel will cause the MUTEC pin to deactivate. In Control Port
Mode, however, auto-mute detection and muting can become dependent on either channel if the MuteB=A function
is enabled. The MUTEC pins are intended to be used as control for an external mute circuit in order to add off-chip
mute capability.
Use of the Mute Control function is not mandatory but recommended for designs requiring the absolute minimum in
extraneous clicks and pops. Also, use of the Mute Control function can enable the system designer to achieve idle
channel noise/signal-to-noise ratios which are only limited by the external mute circuit. The MUTEC pins are activelow. See Figure 16 below for a suggested active-low mute circuit.
+VEE
AC
Couple
AOUT
560 Ω
LPF
Audio
Out
47 kΩ
-VEE
CS4272
+VA
MMUN2111LT1
MUTEC
2 kΩ
10 kΩ
-VEE
Figure 16. Suggested Active-Low Mute Circuit
5.6
Synchronization of Multiple Devices
In systems where multiple ADCs are required, care must be taken to achieve simultaneous sampling. To ensure
synchronous sampling, the MCLK and LRCK must be the same for all of the CS4271’s in the system. If only one
MCLK source is needed, one solution is to place one CS4271 in Master Mode, and slave all of the other CS4271’s
to the one master. If multiple MCLK sources are needed, a possible solution would be to supply all clocks from the
same external source and time the CS4271 reset with the inactive edge of MCLK. This will ensure that all converters
begin sampling on the same clock edge.
5.7
Grounding and Power Supply Decoupling
As with any high resolution converter, the CS4271 requires careful attention to power supply and grounding arrangements if its potential performance is to be realized. Figure 8 shows the recommended power arrangements, with VA
and VL connected to clean supplies. VD, which powers the digital filter, may be run from the system logic supply
(VL) or may be powered from the analog supply (VA) via a resistor. In this case, no additional devices should be
powered from VD. Power supply decoupling capacitors should be as near to the CS4271 as possible, with the low
value ceramic capacitor being the nearest. All signals, especially clocks, should be kept away from the VREF and
VCOM pins in order to avoid unwanted coupling into the modulators. The VREF and VCOM decoupling capacitors,
particularly the 0.1 µF, must be positioned to minimize the electrical path from VREF and AGND. The CDB4271
evaluation board demonstrates the optimum layout and power supply arrangements. To minimize digital noise, connect the CS4271 digital outputs only to CMOS inputs.
34
DS592F1
CS4271
6. CONTROL PORT INTERFACE
The Control Port is used to load all the internal settings of the CS4271. The operation of the Control Port may be
completely asynchronous to the audio sample rate. However, to avoid potential interference problems, the Control
Port pins should remain static if no operation is required.
The Control Port has 2 modes: SPI and I²C, with the CS4271 operating as a slave to control messages in both
modes. If I²C operation is desired, AD0/CS should be tied to VA or AGND. If the CS4271 ever detects a high to low
transition on AD0/CS after power-up, SPI mode will be selected. The Control Port registers are write-only in SPI
mode.
Upon release of the RST pin, the CS4271 will wait approximately 10 ms before it begins its start-up sequence. The
part defaults to Stand-Alone Mode, in which all operational modes are controlled as described under “Stand-Alone
Mode” on page 24. The Control Port is active at all times, and if bit 1 of register 07h (CPEN) is set, the part enters
Control-Port Mode and all operational modes are controlled by the Control Port registers. This bit can be set at any
time, but to avoid unpredictable output noises, bit 1 (CPEN) and bit 0 (PDN) of register 07h should be set by writing
03h before the end of the 10 ms start-up wait period. All registers can then be set as desired before releasing the
PDN bit to begin the start-up sequence. If system requirements do not allow writing to the control port immediately
following the release of RST, the SDIN line should be held at logic “0” until the proper serial mode can be selected.
6.1
SPI Mode
In SPI mode, CS is the CS4271 chip select signal, CCLK is the control port bit clock, CDIN is the input data line from
the microcontroller and the chip address is 0010000. All control signals are inputs and data is clocked in on the rising
edge of CCLK.
Figure 17 shows the operation of the Control Port in SPI mode. To write to a register, bring CS low. The first 7 bits
on CDIN form the chip address, and must be 0010000. The eighth bit is a read/write indicator (R/W), which must be
low to write. The next 8 bits form the Memory Address Pointer (MAP), which is set to the address of the register that
is to be updated. The next 8 bits are the data which will be placed into the register designated by the MAP. See
Table 10 on page 36.
CS
CCLK
CHIP
ADDRESS
CDIN
0010000
MAP
R/W
DATA
MSB
byte 1
LSB
byte n
MAP = Memory Address Pointer
Figure 17. Control Port Timing, SPI mode
The CS4271 has MAP auto increment capability, enabled by the INCR bit in the MAP. If INCR is 0, then the MAP
will stay constant for successive writes. If INCR is set, then MAP will auto increment after each byte is written, allowing block writes to successive registers.
DS592F1
35
CS4271
6.2
I²C Mode
In I²C mode, SDA is a bi-directional data line. Data is clocked into and out of the part by the clock, SCL, with the clock
to data relationship as shown in Figure 18. There is no CS pin. Pin AD0 forms the partial chip address and should be
tied to VA or AGND as required. The upper 6 bits of the 7-bit address field must be 001000. To communicate with the
CS4271, the LSB of the chip address field, which is the first byte sent to the CS4271, should match the setting of the
AD0 pin. The eighth bit of the address byte is the R/W bit (high for a read, low for a write). If the operation is a write,
the next byte is the Memory Address Pointer, MAP, which selects the register to be read or written. The MAP is then
followed by the data to be written. If the operation is a read, then the contents of the register pointed to by the MAP will
be output after the chip address.
The CS4271 has MAP auto increment capability, enabled by the INCR bit in the MAP. If INCR is 0, then the MAP
will stay constant for successive writes. If INCR is set, then MAP will auto increment after each byte is written, allowing block reads or writes of successive registers.
Note 1
SDA
001000
ADDR
AD0
R/W
ACK
DATA
1-8
ACK
DATA
1-8
ACK
SCL
Start
Stop
Note: If operation is a write, this byte contains the Memory Address Pointer, MAP.
Figure 18. Control Port Timing, I²C Mode
Table 10. Memory Address Pointer (MAP)
7
INCR
0
6
Reserved
0
5
Reserved
0
4
Reserved
0
3
MAP3
0
2
MAP2
0
1
MAP1
0
0
MAP0
0
INCR - Auto MAP Increment Enable
Default = ‘0’.
0 - Disabled
1 - Enabled
MAP(3:0) - Memory Address Pointer
Default = ‘0000’.
36
DS592F1
CS4271
7. REGISTER QUICK REFERENCE
This table shows the register names and their associated default values.
Addr
Function
01h Mode Control 1
02h DAC Control
7
6
5
4
3
2
1
0
M1
M0
Ratio1
Ratio0
M/S
DAC_DIF2
DAC_DIF1
DAC_DIF0
0
0
0
0
0
0
0
0
DEM1
DEM0
RMP_UP
RMP_DN
INV_B
INV_A
0
0
0
0
0
0
0
B=A
Soft
ZeroCross
ATAPI3
ATAPI2
ATAPI1
ATAPI0
0
0
1
0
1
0
0
1
MUTE
VOL6
VOL5
VOL4
VOL3
VOL2
VOL1
VOL0
0
0
0
0
0
0
0
0
MUTE
VOL6
VOL5
VOL4
VOL3
VOL2
VOL1
VOL0
0
0
0
0
0
0
0
0
Dither16
ADC_DIF0
MUTEA
MUTEB
0
0
0
0
AMUTE FILT_SEL
1
03h DAC Volume &
Reserved
Mixing Control
04h DAC Ch A Volume Control
05h DAC Ch B Volume Control
06h ADC Control
Reserved Reserved
0
0
0
0
07h Mode Control 2 Reserved Reserved Reserved
LOOP
CPEN
PDN
0
0
0
0
0
0
0
0
PART3
PART2
PART1
PART0
REV3
REV2
REV1
REV0
0
0
0
0
0
0
0
0
08h Chip ID
DS592F1
MUTECA=B FREEZE
HPFDisableA HPFDisableB
37
CS4271
8.
REGISTER DESCRIPTION
** All registers are read/write in I²C mode and write only in SPI mode, unless otherwise noted**
8.1
Mode Control 1 - Address 01h
7
M1
8.1.1
6
M0
5
Ratio1
4
Ratio0
3
M/S
2
DAC_DIF2
1
DAC_DIF1
0
DAC_DIF0
Functional Mode (Bits 7:6)
Function:
Selects the required range of input sample rates.
Table 11. Functional Mode Selection
8.1.2
M1
M0
Mode
0
0
Single-Speed Mode: 4 to 50 kHz sample rates (default)
0
1
Single-Speed Mode: 4 to 50 kHz sample rates
1
0
Double-Speed Mode: 50 to 100 kHz sample rates
1
1
Quad-Speed Mode: 100 to 200 kHz sample rates
Ratio Select (Bits 5:4)
Function:
These bits are used to select the clocking ratios in Control Port Mode. Please refer to Table 8, “Clock
Ratios - Control Port Mode With External Crystal,” on page 28 or Table 9, “Clock Ratios - Control Port
Mode Without External Crystal,” on page 29 for information on which of these bits to set to obtain specific clock ratios.
8.1.3
Master / Slave Mode (Bit 3)
Function:
This bit selects either master or slave operation. Setting this bit will select master mode, while clearing
this bit will select slave mode.
8.1.4
DAC Digital Interface Format (Bits 2:0)
Function:
The required relationship between LRCK, SCLK and SDIN for the DAC is defined by the DAC Digital
Interface Format and the options are detailed in Table 12 and Figures 3-5.
Table 12. DAC Digital Interface Formats
DAC_DIF2 DAC_DIF1 DAC_DIF0
0
0
0
0
0
1
0
0
1
1
1
1
38
1
1
0
0
1
1
0
1
0
1
0
1
Description
Left Justified, up to 24-bit data (default)
I2S, up to 24-bit data
Right Justified, 16-bit Data
Right Justified, 24-bit Data
Right Justified, 20-bit Data
Right Justified, 18-bit Data
Reserved
Reserved
Format
0
1
Figure
3
4
2
3
4
5
5
5
5
5
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CS4271
8.2
DAC Control - Address 02h
7
AMUTE
8.2.1
6
FILT_SEL
5
DEM1
4
DEM0
3
RMP_UP
2
RMP_DN
1
INV_A
0
INV_B
Auto-Mute (Bit 7)
Function:
When set, enables the Auto-Mute function. See “Auto-Mute” on page 30.
8.2.2
Interpolation Filter Select (Bit 6)
Function:
This Function allows the user to select whether the Interpolation Filter has a fast or slow roll off. When
set, this bit selects the slow roll off filter, when cleared it selects the fast roll off filter. The - 3 dB corner
is approximately the same for both filters, but the slope of the roll off is greater for the fast roll off filter.
8.2.3
De-Emphasis Control (Bits 5:4)
Function:
Implementation of the standard 50/15 µs digital de-emphasis filter response, Figure 19, requires reconfiguration of the digital filter to maintain the proper filter response for 32, 44.1 or 48 kHz sample
rates. NOTE: De-emphasis is available only in Single-Speed Mode. See Table 13 below.
Table 13. De-Emphasis Mode Selection
DEM1
0
0
1
1
DEM0
0
1
0
1
Description
Disabled (default)
44.1 kHz de-emphasis
48 kHz de-emphasis
32 kHz de-emphasis
Gain
dB
T1=50 µs
0dB
T2 = 15 µs
-10dB
F1
3.183 kHz
F2
Frequency
10.61 kHz
Figure 19. De-Emphasis Curve
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CS4271
8.2.4
Soft Volume Ramp-Up After Error (Bit 3)
Function:
An un-mute will be performed after executing a filter mode change, after a MCLK/LRCK ratio change
or error, and after changing the Functional Mode. When this bit is set, this un-mute is effected, similar
to attenuation changes, by the Soft and ZeroCross bits in the DAC Volume & Mixing Control register.
When cleared, an immediate un-mute is performed in these instances.
Note: For best results, it is recommended that this feature be used with the RMP_DN bit.
8.2.5
Soft Ramp-Down Before Filter Mode Change (Bit 2)
Function:
A mute will be performed prior to executing a filter mode change. When this bit is set, this mute is
effected, similar to attenuation changes, by the Soft and ZeroCross bits in the DAC Volume & Mixing
Control register. When cleared, an immediate mute is performed prior to executing a filter mode
change.
Note: For best results, it is recommended that this feature be used in conjunction with the RMP_UP
bit.
8.2.6
Invert Signal Polarity (Bits 1:0)
Function:
When set, this bit activates an inversion of the signal polarity for the appropriate channel. This is useful if a board layout error has occurred, or other situations where a 180 degree phase shift is desirable.
8.3
DAC Volume & Mixing Control - Address 03h
7
Reserved
8.3.1
6
B=A
5
Soft
4
ZeroCross
3
ATAPI3
2
ATAPI2
1
ATAPI1
0
ATAPI0
Channel B Volume = Channel A Volume (Bit 6)
Function:
The AOUTA and AOUTB volume levels are independently controlled by the A and the B Channel Volume Control Bytes when this function is disabled. The volume on both AOUTA and AOUTB are determined by the A Channel Volume Control Byte and the B Channel Byte is ignored when this function
is enabled. Volume and muting functions are effected by the Soft Ramp and ZeroCross functions below.
8.3.2
Soft Ramp or Zero Cross Enable (Bits 5:4)
Function:
Soft Ramp Enable
Soft Ramp allows level changes, both muting and attenuation, to be implemented by incrementally
ramping, in 1/8 dB steps, from the current level to the new level at a rate of 1 dB per 8 left/right clock
periods. See Table 14 on page 41.
Zero Cross Enable
Zero Cross Enable dictates that signal level changes, either by attenuation changes or muting, will
occur on a signal zero crossing to minimize audible artifacts. The requested level change will occur
after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms at 48 kHz sample
rate) if the signal does not encounter a zero crossing. The zero cross function is independently mon-
40
DS592F1
CS4271
itored and implemented for each channel. See Table 14 on page 41.
Soft Ramp and Zero Cross Enable
Soft Ramp and Zero Cross Enable dictate that signal level changes, either by attenuation changes or
muting, will occur in 1/8 dB steps and be implemented on a signal zero crossing. The 1/8 dB level
change will occur after a time-out period between 512 and 1024 sample periods (10.7 ms to 21.3 ms
at 48 kHz sample rate) if the signal does not encounter a zero crossing. The zero cross function is
independently monitored and implemented for each channel. See Table 14 on page 41.
Table 14. Soft Cross or Zero Cross Mode Selection
Soft
0
0
1
1
8.3.3
ZeroCross
0
1
0
1
Mode
Changes to affect immediately
Zero Cross enabled
Soft Ramp enabled (default)
Soft Ramp and Zero Cross enabled
ATAPI Channel Mixing and Muting (Bits 3:0)
Function:
The CS4271 implements the channel mixing functions of the ATAPI CD-ROM specification. See
Table 15 on page 42
Left Channel
Audio Data
A Channel
Volume
Control
AoutA
B Channel
Volume
Control
AoutB
Σ
Right Channel
Audio Data
Figure 20. ATAPI Block Diagram
DS592F1
41
CS4271
Table 15. ATAPI Decode
ATAPI3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
8.4
ATAPI2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
ATAPI1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
ATAPI0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
AOUTA
MUTE
MUTE
MUTE
MUTE
aR
aR
aR
aR
aL
aL
aL
aL
a[(L+R)/2]
a[(L+R)/2]
a[(L+R)/2]
a[(L+R)/2]
AOUTB
MUTE
bR
bL
b[(L+R)/2]
MUTE
bR
bL
b[(L+R)/2]
MUTE
bR
bL
b[(L+R)/2]
MUTE
bR
bL
b[(L+R)/2]
DAC Channel A Volume Control - Address 04h
See 8.5 DAC Channel B Volume Control - Address 05h
8.5
DAC Channel B Volume Control - Address 05h
7
MUTE
8.5.1
6
VOL6
5
VOL5
4
VOL4
3
VOL3
2
VOL2
1
VOL1
0
VOL0
Mute (Bit 7)
Function:
The DAC output will mute when this bit is set. Though this bit is active high, it should be noted that
the MUTEC pins are active low. The common mode voltage on the output will be retained when this
bit is set. The muting function is effected, similar to attenuation changes, by the Soft and ZeroCross
bits in the Volume and Mixing Control register. The MUTEC pin for the respective channel will become
active during the mute period if the MUTE bit is set. Both the AMUTEC and BMUTEC will become
active if either MUTE register is enabled and the MUTECB=A bit (register 7) is enabled.
8.5.2
Volume Control (Bits 6:0)
Function:
The digital volume control allows the user to attenuate the signal in 1 dB increments from 0 to -127 dB.
Volume settings are decoded as shown in Table 16. The volume changes are implemented as dictated by the Soft and ZeroCross bits in the DAC Volume & Mixing Control register (see section 8.3.2).
Table 16. Digital Volume Control Example Settings
Binary Code
0000000
0010100
0101000
0111100
1011010
42
Decimal Value
0
20
40
60
90
Volume Setting
0 dB
-20 dB
-40 dB
-60 dB
-90 dB
DS592F1
CS4271
8.6
ADC Control - Address 06h
7
Reserved
8.6.1
6
Reserved
5
Dither16
4
ADC_DIF
3
MUTEA
2
MUTEB
1
HPFDisableA
0
HPFDisableB
Dither for 16-Bit Data (Bit 5)
Function:
When set, this bit activates the Dither for 16-Bit Data feature as described in “Dither for 16-Bit Data”
on page 30.
8.6.2
ADC Digital Interface Format (Bit 4)
Function:
The required relationship between LRCK, SCLK and SDOUT for the ADC is defined by the ADC Digital Interface Format. The options are detailed in Table 17 and may be seen in Figure 3 and 4.
Table 17. ADC Digital Interface Formats
ADC_DIF
Description
Format
Figure
0
Left Justified, up to 24-bit data (default)
0
3
1
I2S, up to 24-bit data
1
4
8.6.3
ADC Channel A & B Mute (Bits 3:2)
Function:
When this bit is set, the output of the ADC for the selected channel will be muted.
8.6.4
Channel A & B High Pass Filter Disable (Bits 1:0)
Function:
When this bit is set, the internal high-pass filter for the selected channel will be disabled.The current
DC offset value will be frozen and continue to be subtracted from the conversion result. See “High
Pass Filter and DC Offset Calibration” on page 30.
8.7
Mode Control 2 - Address 07h
7
Reserved
8.7.1
6
Reserved
5
Reserved
4
LOOP
3
MUTECA=B
2
FREEZE
1
CPEN
0
PDN
Digital Loopback (Bit 4)
Function:
When this bit is set, an internal digital loopback from the ADC to the DAC will be enabled. Please refer
to “Internal Digital Loopback” on page 30.
8.7.2
AMUTEC = BMUTEC (Bit 3)
Function:
When this function is enabled, the individual controls for AMUTEC and BMUTEC are internally connected through an AND gate prior to the output pins. Therefore, the external AMUTEC and BMUTEC
pins will go active only when the requirements for both AMUTEC and BMUTEC are valid.
DS592F1
43
CS4271
8.7.3
Freeze (Bit 2)
Function:
This function allows modifications to the control port registers without the changes taking effect until
FREEZE is disabled. To make multiple changes in the Control Port registers take effect simultaneously, set the FREEZE bit, make all register changes, then clear the FREEZE bit.
8.7.4
Control Port Enable (Bit 1)
Function:
This bit is cleared by default, allowing the device to power-up in Stand-Alone Mode. Control Port
Mode can be accessed by setting this bit. This will allow the operation of the device to be controlled
by the registers and the pin definitions will conform to Control Port Mode. See “Recommended PowerUp Sequence - Access to Control Port Mode” on page 27.
8.7.5
Power Down (Bit 0)
Function:
The device will enter a low-power state whenever this bit is set. The power-down bit is set by default
and must be cleared before normal operation in Control Port Mode can occur. The contents of the
control registers are retained when the device is in power-down.
8.8
Chip ID - Register 08h
B7
PART3
B6
PART2
B5
PART1
B4
PART0
B3
REV3
B2
REV2
B1
REV1
B0
REV0
This is a Read-Only register.
8.8.1
Chip ID (Bits 7:4)
Function:
Chip ID code for the CS4271. Permanently set to 0000b (0h).
8.8.2
Chip Revision (Bits 3:0)
Function:
Chip Revision code for the CS4271.
Revision A is coded as 0000b (0h).
Revision B is coded as 0000b (0h).
44
DS592F1
CS4271
9.
PARAMETER DEFINITIONS
Dynamic Range
The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified
bandwidth. Dynamic Range is a signal-to-noise ratio measurement over the specified bandwidth made
with a -60 dBFS signal. 60 dB is added to resulting measurement to refer the measurement to full-scale.
This technique ensures that the distortion components are below the noise level and do not affect the
measurement. This measurement technique has been accepted by the Audio Engineering Society,
AES17-1991, and the Electronic Industries Association of Japan, EIAJ CP-307. Expressed in decibels.
Total Harmonic Distortion + Noise
The ratio of the rms value of the signal to the rms sum of all other spectral components over the specified
bandwidth (typically 10 Hz to 20 kHz), including distortion components. Expressed in decibels. Measured
at -1 and -20 dBFS as suggested in AES17-1991 Annex A.
Frequency Response
A measure of the amplitude response variation from 10 Hz to 20 kHz relative to the amplitude response
at 1 kHz. Units in decibels.
Interchannel Isolation
A measure of crosstalk between the left and right channels. Measured for each channel at the converter's
output with no signal to the input under test and a full-scale signal applied to the other channel. Units in
decibels.
Interchannel Gain Mismatch
The gain difference between left and right channels. Units in decibels.
Gain Error
The deviation from the nominal full-scale analog output for a full-scale digital input.
Gain Drift
The change in gain value with temperature. Units in ppm/°C.
Offset Error
The deviation of the mid-scale transition (111...111 to 000...000) from the ideal. Units in mV.
DS592F1
45
CS4271
10.PACKAGE DIMENSIONS
28L TSSOP (4.4 mm BODY) PACKAGE DRAWING
N
D
E11
A2
E
A
∝
e
b2
SIDE VIEW
A1
L
END VIEW
SEATING
PLANE
1 2 3
TOP VIEW
DIM
A
A1
A2
b
D
E
E1
e
L
∝
MIN
-0.002
0.03150
0.00748
0.378 BSC
0.248
0.169
-0.020
0°
INCHES
NOM
-0.004
0.035
0.0096
0.382 BSC
0.2519
0.1732
0.026 BSC
0.024
4°
MAX
0.47
0.006
0.04
0.012
0.386 BSC
0.256
0.177
-0.029
8°
MIN
-0.05
0.80
0.19
9.60 BSC
6.30
4.30
-0.50
0°
MILLIMETERS
NOM
-0.10
0.90
0.245
9.70 BSC
6.40
4.40
0.65 BSC
0.60
4°
NOTE
MAX
1.20
0.15
1.00
0.30
9.80 BSC
6.50
4.50
-0.75
8°
2,3
1
1
JEDEC #: MO-153
Controlling Dimension is Millimeters.
Notes: 1. “D” and “E1” are reference datums and do not included mold flash or protrusions, but do include mold
mismatch and are measured at the parting line, mold flash or protrusions shall not exceed 0.20 mm per
side.
2. Dimension “b” does not include dambar protrusion/intrusion. Allowable dambar protrusion shall be
0.13 mm total in excess of “b” dimension at maximum material condition. Dambar intrusion shall not
reduce dimension “b” by more than 0.07 mm at least material condition.
3. These dimensions apply to the flat section of the lead between 0.10 and 0.25 mm from lead tips.
THERMAL CHARACTERISTICS AND SPECIFICATIONS
Parameters
Package Thermal Resistance (Note 4)
Allowable Junction Temperature
Symbol
28-TSSOP
θJA
θJC
Min
-
Typ
37
13
-
Max
135
Units
°C/Watt
°C/Watt
°C
Notes: 4. θJA is specified according to JEDEC specifications for multi-layer PCBs.
46
DS592F1
CS4271
11.APPENDIX
0
20
20
40
40
Amplitude (dB)
Amplitude (dB)
0
60
60
80
80
100
100
120
120
0.4
0.5
0.6
0.7
0.8
Frequency(normalized to Fs)
0.9
1
Figure 21. DAC Single Speed (fast) Stopband Rejection
0.4
0.42
0.44
0.46
0.48
0.5
0.52
Frequency(normalized to Fs)
0.54
0.56
0.58
0.6
Figure 22. DAC Single Speed (fast) Transition Band
0.02
0
1
0.015
2
0.01
0.005
4
Amplitude (dB)
Amplitude (dB)
3
5
6
0
0.005
7
0.01
8
0.015
9
10
0.45
0.46
0.47
0.48
0.49
0.5
0.51
Frequency(normalized to Fs)
0.52
0.53
0.54
0.02
0.55
Figure 23. DAC Single Speed (fast) Transition Band (detail)
0.1
0.15
0.2
0.25
0.3
Frequency(normalized to Fs)
0.35
0.4
0.45
0.5
0
20
20
40
40
Amplitude (dB)
Amplitude (dB)
0.05
Figure 24. DAC Single Speed (fast) Passband Ripple
0
60
80
60
80
100
120
0
100
0.4
0.5
0.6
0.7
0.8
Frequency(normalized to Fs)
0.9
1
Figure 25. DAC Single Speed (slow) Stopband Rejection
DS592F1
120
0.4
0.42
0.44
0.46
0.48
0.5
0.52
Frequency(normalized to Fs)
0.54
0.56
0.58
0.6
Figure 26. DAC Single Speed (slow) Transition Band
47
CS4271
0.02
0
1
0.015
2
0.01
3
Amplitude (dB)
Amplitude (dB)
0.005
4
5
6
0
0.005
7
0.01
8
0.015
9
10
0.45
0.02
0.46
0.47
0.48
0.49
0.5
0.51
Frequency(normalized to Fs)
0.52
0.53
0.54
0.55
Figure 27. DAC Single Speed (slow) Transition Band (detail)
0.1
0.15
0.2
0.25
0.3
Frequency(normalized to Fs)
0.35
0.4
0.45
0.5
0
20
20
40
40
Amplitude (dB)
Amplitude (dB)
0.05
Figure 28. DAC Single Speed (slow) Passband Ripple
0
60
60
80
80
100
100
120
0
120
0.4
0.5
0.6
0.7
0.8
Frequency(normalized to Fs)
0.9
1
Figure 29. DAC Double Speed (fast) Stopband Rejection
0.4
0.42
0.44
0.46
0.48
0.5
0.52
Frequency(normalized to Fs)
0.54
0.56
0.58
0.6
Figure 30. DAC Double Speed (fast) Transition Band
0
0.02
1
0.015
2
0.01
0.005
4
Amplitude (dB)
Amplitude (dB)
3
5
6
0
0.005
7
0.01
8
0.015
9
10
0.45
0.46
0.47
0.48
0.49
0.5
0.51
Frequency(normalized to Fs)
0.52
0.53
0.54
0.55
Figure 31. DAC Double Speed (fast) Transition Band (detail)
48
0.02
0
0.05
0.1
0.15
0.2
0.25
0.3
Frequency(normalized to Fs)
0.35
0.4
0.45
0.5
Figure 32. DAC Double Speed (fast) Passband Ripple
DS592F1
CS4271
0
20
20
40
40
Amplitude (dB)
Amplitude (dB)
0
60
60
80
80
100
100
120
120
0.2
0.3
0.4
0.5
0.6
0.7
Frequency(normalized to Fs)
0.8
0.9
1
Figure 33. DAC Double Speed (slow) Stopband Rejection
0.2
0.3
0.4
0.5
0.6
Frequency(normalized to Fs)
0.7
0.8
Figure 34. DAC Double Speed (slow) Transition Band
0
0.02
1
0.015
2
0.01
0.005
4
Amplitude (dB)
Amplitude (dB)
3
5
6
0
0.005
7
0.01
8
0.015
9
10
0.45
0.46
0.47
0.48
0.49
0.5
0.51
Frequency(normalized to Fs)
0.52
0.53
0.54
0.02
0.55
Figure 35. DAC Double Speed (slow) Transition Band (detail)
40
40
Amplitude (dB)
Amplitude (dB)
20
60
0.15
0.2
Frequency(normalized to Fs)
0.25
0.3
0.35
60
80
80
100
100
120
0.3
0.4
0.5
0.6
0.7
Frequency(normalized to Fs)
0.8
0.9
Figure 37. DAC Quad Speed (fast) Stopband Rejection
DS592F1
0.1
0
20
0.2
0.05
Figure 36. DAC Double Speed (slow) Passband Ripple
0
120
0
1
0.2
0.3
0.4
0.5
0.6
Frequency(normalized to Fs)
0.7
0.8
Figure 38. DAC Quad Speed (fast) Transition Band
49
CS4271
0.2
0
1
0.15
2
0.1
3
Amplitude (dB)
Amplitude (dB)
0.05
4
5
6
0
0.05
7
0.1
8
0.15
9
10
0.45
0.2
0.46
0.47
0.48
0.49
0.5
0.51
Frequency(normalized to Fs)
0.52
0.53
0.54
0.55
Figure 39. DAC Quad Speed (fast) Transition Band (detail)
0
0.05
0.1
0.15
Frequency(normalized to Fs)
0.2
0.25
Figure 40. DAC Quad Speed (fast) Passband Ripple
0
0
20
40
40
Amplitude (dB)
Amplitude (dB)
20
60
60
80
80
100
100
120
120
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Frequency(normalized to Fs)
0.8
0.9
1
Figure 41. DAC Quad Speed (slow) Stopband Rejection
0.1
0.2
0.3
0.4
0.5
0.6
Frequency(normalized to Fs)
0.7
0.8
0.9
Figure 42. DAC Quad Speed (slow) Transition Band
0.02
0
1
0.015
2
0.01
0.005
4
Amplitude (dB)
Amplitude (dB)
3
5
6
0
0.005
7
0.01
8
0.015
9
10
0.45
0.46
0.47
0.48
0.49
0.5
0.51
Frequency(normalized to Fs)
0.52
0.53
0.54
0.55
Figure 43. DAC Quad Speed (slow) Transition Band (detail)
50
0.02
0
0.02
0.04
0.06
0.08
Frequency(normalized to Fs)
0.1
0.12
Figure 44. DAC Quad Speed (slow) Passband Ripple
DS592F1
0
0
-10
-10
-20
-20
-30
-30
-40
-40
-50
-50
Amplitude (dB)
Amplitude (dB)
CS4271
-60
-70
-80
-60
-70
-80
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
-140
0.40
1.0
Frequency (normalized to Fs)
0.42
0.44
0.46
0.48
0.50
0.52
0.54
0.56
0.58
0.60
Frequency (normalized to Fs)
Figure 45. ADC Single Speed Mode Stopband Rejection
Figure 46. ADC Single Speed Mode Transition Band
0.10
0
-1
0.08
-2
0.05
0.03
-4
Amplitude (dB)
Amplitude (dB)
-3
-5
-6
0.00
-0.03
-7
-0.05
-8
-9
-0.08
-10
0.45
0.46
0.47
0.48
0.49
0.50
0.51
0.52
0.53
0.54
0.55
Frequency (normalized to Fs)
-0.10
0.00
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Frequency (normalized to Fs)
Figure 48. ADC Single Speed Mode Passband Ripple
0
0
-10
-10
-20
-20
-30
-30
-40
-40
-50
-50
Amplitude (dB)
Amplitude (dB)
Figure 47. ADC Single Speed Mode Transition Band (Detail)
-60
-70
-80
-60
-70
-80
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
Frequency (normalized to Fs)
Figure 49. ADC Double Speed Mode Stopband Rejection
DS592F1
1.0
-140
0.40
0.43
0.45
0.48
0.50
0.53
0.55
0.58
0.60
0.63
0.65
0.68
0.70
Frequency (normalized to Fs)
Figure 50. ADC Double Speed Mode Transition Band
51
CS4271
0.10
0
-1
0.08
-2
0.05
-3
0.03
Amplitude (dB)
Amplitude (dB)
-4
-5
-6
0.00
-0.03
-7
-0.05
-8
-9
-0.08
-10
0.40
0.43
0.45
0.48
0.50
0.53
-0.10
0.00
0.55
Frequency (normalized to Fs)
0.05
0.10
0.15
0.20
0.25
0.30
0.35
0.40
0.45
0.50
Frequency (normalized to Fs)
Figure 51. ADC Double Speed Mode Transition Band (Detail)
Figure 52. ADC Double Speed Mode Passband Ripple
0
0
-10
-10
-20
-20
-30
-30
-40
Amplitude (dB)
Amplitude (dB)
-40
-50
-60
-70
-50
-60
-70
-80
-80
-90
-90
-100
-100
-110
-110
-120
-130
-120
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0.2
1.0
0.25
0.3
0
0.10
-1
0.08
-2
0.06
-3
0.04
-4
0.02
-5
-6
-0.04
-0.06
-9
-0.08
-10
0.25
0.3
0.35
0.4
0.45
0.5
0.55
Frequency (normalized to Fs)
Figure 55. ADC Quad Speed Mode Transition Band (Detail)
52
0.5
0.55
0.6
0.65
0.7
0.75
0.8
0.00
-8
0.2
0.45
-0.02
-7
0.15
0.4
Figure 54. ADC Quad Speed Mode Transition Band
Amplitude (dB)
Amplitude (dB)
Figure 53. ADC Quad Speed Mode Stopband Rejection
0.1
0.35
Frequency (normalized to Fs)
Frequency (normalized to Fs)
0.6
-0.10
0.00
0.05
0.10
0.15
0.20
0.25
Frequency (normalized to Fs)
Figure 56. ADC Quad Speed Mode Passband Ripple
DS592F1
CS4271
Table 18. Revision History
Release
A1
PP1
PP2
PP3
F1
Date
January 2003
March 2003
October 2003
September 2004
August 2005
Changes
Advance Release
Preliminary Release
- Corrected the description of pins 17 and 18 on page 6.
- Corrected the description of pins 17 and 18 on page 8.
- Updated Figure 8 on page 23.
- Updated Table 9 on page 29.
- Updated the DC Electrical Characteristics table on page 17.
- Updated the DAC Analog Filter Response tables on pages 10 and 11.
- Updated the ADC Digital Filter Characteristics table on page 16.
- Updated the DAC Full Scale Differential Output Voltage specification on
pages 10 and 11.
Add lead-free device ordering info.
Final Release
- Updated Ordering Information on page 2.
- Updated Specified Operating Conditions table on page 9 to reflect orderingsuffix independent temperature grade information.
- Updated DAC Analog Characteristics tables on pages 10 and 11 to reflect
ordering-suffix independent temperature grade information.
- Updated ADC Analog Characteristics tables on pages 14 and 15 to reflect
ordering-suffix independent temperature grade information.
- Updated the DC Electrical Characteristics table on page 17.
- Corrected error in the SCLK Period units shown in the Switching Characteristics - Serial Audio Port table on page 18.
- Corrected error in the Memory Address Pointer table on page 36.
- Updated Chip ID register description on page 44.
Contacting Cirrus Logic Support
For all product questions and inquiries contact a Cirrus Logic Sales Representative.
To find one nearest you go to www.cirrus.com
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