AD SSM2603

Low Power Audio Codec
SSM2603
FEATURES
GENERAL DESCRIPTION
Stereo, 24-bit analog-to-digital and digital-to-analog converters
DAC SNR: 100 dB (A-weighted), THD: −80 dB at 48 kHz, 3.3 V
ADC SNR: 90 dB (A-weighted), THD: −80 dB at 48 kHz, 3.3 V
Highly efficient headphone amplifier
Stereo line input and monaural microphone input
Low power
7 mW stereo playback (1.8 V/1.5 V supplies)
14 mW record and playback (1.8 V/1.5 V supplies)
Low supply voltages
Analog: 1.8 V to 3.6 V
Digital core: 1.5 V to 3.6 V
Digital I/O: 1.8 V to 3.6 V
256/384 oversampling rate in normal mode; 250/272 oversampling rate in USB mode
Audio sampling rates: 8 kHz, 11.025 kHz, 12 kHz, 16 kHz,
22.05 kHz, 24 kHz, 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz,
and 96 kHz
28-lead, 5 mm × 5 mm LFCSP (QFN) package
The SSM2603 is a low power, high quality stereo audio codec
for portable digital audio applications with one set of stereo
programmable gain amplifier (PGA) line inputs and one
monaural microphone input. It features two 24-bit analog-todigital converter (ADC) channels and two 24-bit digital-toanalog (DAC) converter channels.
The SSM2603 can operate as a master or a slave. It supports
various master clock frequencies, including 12 MHz or 24 MHz
for USB devices; standard 256 fS or 384 fS based rates, such as
12.288 MHz and 24.576 MHz; and many common audio sampling
rates, such as 96 kHz, 88.2 kHz, 48 kHz, 44.1 kHz, 32 kHz, 24 kHz,
22.05 kHz, 16 kHz, 12 kHz, 11.025 kHz, and 8 kHz.
The SSM2603 can operate at power supplies as low as 1.8 V for
the analog circuitry and as low as 1.5 V for the digital circuitry.
The maximum voltage supply is 3.6 V for all supplies.
The SSM2603 software-programmable stereo output options
provide the user with many application possibilities because the
device can be used as a headphone driver or as a speaker driver.
Its volume control functions provide a large range of gain
control of the audio signal.
APPLICATIONS
Mobile phones
MP3 players
Portable gaming
Portable electronics
Educational toys
The SSM2603 is specified over the industrial temperature range
of −40°C to +85°C. It is available in a 28-lead, 5 mm × 5 mm
lead frame chip scale package (LFCSP).
FUNCTIONAL BLOCK DIAGRAM
AVDD
VMID AGND
DBVDD DGND DCVDD
HPVDD PGND
SSM2603
MICBIAS
BYPASS
–34.5dB TO +33dB,
1.5dB STEP
SIDETONE
6dB TO 15dB/MUTE 3dB STEP
–73dB TO +6dB,
1dB STEP
RHPOUT
RLINEIN
MUX
ADC
DAC
ROUT
DIGITAL
PROCESSOR
MICIN
LOUT
0dB/20dB/
40dB BOOST
MUX
ADC
DAC
LLINEIN
LHPOUT
–34.5dB TO +33dB,
1.5dB STEP
SIDETONE
6dB TO 15dB/MUTE 3dB STEP
–73dB TO +6dB,
1dB STEP
BYPASS
MCLK/ XTO CLKOUT
XTI
DIGITAL AUDIO INTERFACE
CONTROL INTERFACE
PBDAT RECDAT BCLK PBLRC RECLRC MUTE CSB
SDIN SCLK
07241-001
CLK
Figure 1.
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2008 Analog Devices, Inc. All rights reserved.
SSM2603
TABLE OF CONTENTS
Features .............................................................................................. 1
Digital Audio Interface .............................................................. 15
Applications....................................................................................... 1
Software Control Interface........................................................ 17
General Description ......................................................................... 1
Typical Application Circuits ......................................................... 18
Functional Block Diagram .............................................................. 1
Register Map ................................................................................... 19
Revision History ............................................................................... 2
Register Map Details ...................................................................... 20
Specifications..................................................................................... 3
Left-Channel ADC Input Volume, Address 0x00.................. 20
Digital Filter Characteristics ....................................................... 4
Right-Channel ADC Input Volume, Address 0x01 ............... 21
Timing Characteristics ................................................................ 5
Left-Channel DAC Volume, Address 0x02............................. 22
Absolute Maximum Ratings............................................................ 7
Right-Channel DAC Volume, Address 0x03 .......................... 22
Thermal Resistance ...................................................................... 7
Analog Audio Path, Address 0x04 ........................................... 23
ESD Caution.................................................................................. 7
Digital Audio Path, Address 0x05 ............................................ 23
Pin Configuration and Function Descriptions............................. 8
Power Management, Address 0x06.......................................... 24
Typical Performance Characteristics ............................................. 9
Digital Audio I/F, Address 0x07 ............................................... 25
Converter Filter Response........................................................... 9
Sampling Rate, Address 0x08.................................................... 25
Digital De-Emphasis .................................................................. 10
Active, Address 0x09.................................................................. 28
Theory of Operation ...................................................................... 11
Software Reset, Address 0x0F................................................... 28
Digital Core ................................................................................. 11
ALC Control 1, Address 0x10................................................... 29
ADC and DAC............................................................................ 11
ALC Control 2, Address 0x11................................................... 29
ADC High-Pass and DAC De-Emphasis Filters .................... 11
Noise Gate, Address 0x12.......................................................... 30
Hardware Mute Pin .................................................................... 11
Outline Dimensions ....................................................................... 31
Automatic Level Control (ALC)............................................... 12
Ordering Guide .......................................................................... 31
Analog Interface ......................................................................... 13
REVISION HISTORY
2/08—Revision 0: Initial Version
Rev. 0 | Page 2 of 32
SSM2603
SPECIFICATIONS
TA = 25°C, AVDD = DVDD = 3.3 V, PVDD = 3.3 V, 1 kHz signal, fS = 48 kHz, PGA gain = 0 dB, 24-bit audio data, unless otherwise noted.
Table 1.
Parameter
RECOMMENDED OPERATING CONDITIONS
Analog Voltage Supply (AVDD)
Digital Power Supply
Ground (AGND, PGND, DGND)
POWER CONSUMPTION
Power-Up
Stereo Record (1.5 V and 1.8 V)
Stereo Record (3.3 V)
Stereo Playback (1.5 V and 1.8 V)
Stereo Playback (3.3 V)
Power-Down
LINE INPUT
Input Signal Level (0 dB)
Input Impedance
Input Capacitance
Signal-to-Noise Ratio (A-Weighted)
Min
Typ
Max
Unit
1.8
1.5
3.3
3.3
0
3.6
3.6
V
V
V
7
22
7
22
40
70
Total Harmonic Distortion (THD)
Channel Separation
Programmable Gain
Gain Step
Mute Attenuation
MICROPHONE INPUT
Input Signal Level
Signal-to-Noise Ratio (A-Weighted)
Total Harmonic Distortion
Power Supply Rejection Ratio
Mute Attenuation
Input Resistance
Input Capacitance
MICROPHONE BIAS
Bias Voltage
Bias Current Source
Noise in the Signal Bandwidth
LINE OUTPUT 1
Full-Scale Output
Signal-to-Noise Ratio (A-Weighted)
THD + N
Power Supply Rejection Ratio
Channel Separation
−34.5
1 × AVDD/3.3
200
10
480
10
90
84
−80
−75
80
0
1.5
−80
+33.5
V rms
kΩ
kΩ
kΩ
pF
dB
dB
dB
dB
dB
dB
dB
dB
V rms
dB
−70
50
80
10
10
dB
dB
dB
kΩ
pF
3
40
85
mW
mW
mW
mW
μW
1
85
0.75 × AVDD
1 × AVDD/3.3
100
94
−80
−75
50
80
V
mA
nV/√Hz
V rms
dB
−70
Rev. 0 | Page 3 of 32
Conditions
dB
dB
dB
PGA gain = 0 dB
PGA gain = +33 dB
PGA gain = −34.5 dB
PGA gain = 0 dB, AVDD = 3.3 V
PGA gain = 0 dB, AVDD = 1.8 V
−1 dBFS input, AVDD = 3.3 V
−1 dBFS input, AVDD = 1.8 V
Microphone gain = 0 dB
(RSOURCE = 40 kΩ)
0 dBFS input, 0 dB gain
20 Hz to 20 kHz
AVDD = 3.3 V
AVDD = 1.8 V
AVDD = 3.3 V
AVDD = 1.8 V
SSM2603
Parameter
HEADPHONE OUTPUT
Full-Scale Output Voltage
Maximum Output Power
Signal-to-Noise Ratio (A-Weighted)
Min
85
THD + N
Power Supply Rejection Ratio
Mute Attenuation
LINE INPUT TO LINE OUTPUT
Full-Scale Output Voltage
Signal-to-Noise Ratio (A-Weighted)
Total Harmonic Distortion
Power Supply Rejection
MICROPHONE INPUT TO
HEADPHONE OUTPUT
Full-Scale Output Voltage
Signal-to-Noise Ratio (A-Weighted)
Power Supply Rejection Ratio
Programmable Attenuation
Gain Step
Mute Attenuation
1
Typ
Max
Unit
1 × AVDD/3.3
30
60
96
90
−65
−60
50
80
V rms
mW
mW
dB
dB
dB
dB
dB
dB
1 × AVDD/3.3
92
86
−80
−80
50
V rms
dB
dB
dB
dB
dB
1 × AVDD/3.3
94
88
50
V rms
dB
dB
dB
dB
dB
dB
6
15
3
80
Conditions
RL = 32 Ω
RL = 16 Ω
AVDD = 3.3 V
AVDD = 1.8 V
POUT = 10 mW
POUT = 20 mW
AVDD = 3.3 V
AVDD = 1.8 V
AVDD = 3.3 V
AVDD = 1.8 V
AVDD = 3.3 V
AVDD = 1.8 V
The line output is tested by sending a −1 dBFS input from the DAC to the line output.
DIGITAL FILTER CHARACTERISTICS
Table 2.
Parameter
ADC FILTER
Pass Band
Min
Typ
0
Max
Unit
Conditions
0.445 fS
Hz
Hz
dB
Hz
dB
Hz
Hz
Hz
±0.04 dB
−6 dB
0.5 fS
Pass-Band Ripple
Stop Band
Stop-Band Attenuation
High-Pass Filter Corner Frequency
DAC FILTER
Pass Band
±0.04
0.555 fS
−61
3.7
10.4
21.6
0
0.445 fS
0.5 fS
Pass-Band Ripple
Stop Band
Stop-Band Attenuation
CORE CLOCK TOLERANCE
Frequency Range
Jitter Tolerance
±0.04
0.555 fS
−61
8.0
13.8
50
Rev. 0 | Page 4 of 32
Hz
Hz
dB
Hz
dB
MHz
ps
f > 0.567 fS
−3 dB
−0.5 dB
−0.1 dB
±0.04 dB
−6 dB
f > 0.565 fS
SSM2603
TIMING CHARACTERISTICS
Table 3. I2C® Timing
tMIN
600
600
600
1.3
0
100
Limit
tMAX
Unit
ns
ns
ns
μs
kHz
ns
ns
ns
ns
ns
526
900
300
300
600
Description
Start condition setup time
Start condition hold time
SCLK pulse width high
SCLK pulse width low
SCLK frequency
Data setup time
Data hold time
SDIN and SCLK rise time
SDIN and SCLK fall time
Stop condition setup time
tSCH
SDIN
tPL
SCLK
tHCS
tDS
tRT
tSCS
tPH
tDH
07241-036
Parameter
tSCS
tSCH
tPH
tPL
fSCLK
tDS
tDH
tRT
tFT
tHCS
tFT
Figure 2. I2C Timing
Table 4. Digital Audio Interface Slave Mode Timing
tMIN
10
10
10
10
tBCH
tBCL
tBCY
25
25
50
Limit
tMAX
Unit
ns
ns
ns
ns
ns
30
Description
PBDAT setup time from BCLK rising edge
PBDAT hold time from BCLK rising edge
RECLRC/PBLRC setup time to BCLK rising edge
RECLRC/PBLRC hold time to BCLK rising edge
RECDAT propagation delay from BCLK falling edge (external
load of 70 pF)
BCLK pulse width high
BCLK pulse width low
BCLK cycle time
ns
ns
ns
tBCH
BCLK
tBCL
tBCY
PBLRC/
RECLRC
tDS tLRH
tLRSU
PBDAT
tDD
tDH
RECDAT
Figure 3. Digital Audio Interface Slave Mode Timing
Rev. 0 | Page 5 of 32
07241-025
Parameter
tDS
tDH
tLRSU
tLRH
tDD
SSM2603
Table 5. Digital Audio Interface Master Mode Timing
Parameter
tDST
tDHT
tDL
tDDA
tBCLKR
tBCLKF
tBCLKDS
Limit
tMAX
tMIN
30
10
Unit
ns
ns
ns
ns
ns
ns
10
10
10
10
45:55:00
Description
PBDAT setup time to BCLK rising edge
PBDAT hold time to BCLK rising edge
RECLRC/PBLRC propagation delay from BCLK falling edge
RECDAT propagation delay from BCLK falling edge
BCLK rising time (10 pF load)
BCLK falling time (10 pF load)
BCLK duty cycle (normal and USB mode)
55:45:00
BCLK
tDL
PBLRC/
RECLRC
tDST
tDHT
07241-026
PBDAT
tDDA
RECDAT
Figure 4. Digital Audio Interface Master Mode Timing
Table 6. System Clock Timing
tMIN
72
40:60
32
32
20
20
Limit
tMAX
Unit
ns
60:40:00
ns
ns
ns
ns
Description
MCLK/XTI system clock cycle time
MCLK/XTI duty cycle
MCLK/XTI system clock pulse width high
MCLK/XTI system clock pulse width low
CLKOUT propagation delay from MCLK/XTI falling edge
CLKODIV2 propagation delay from MCLK/XTI falling edge
tXTIH
tCOP
MCLK/XTI
tXTIL
tXTIY
CLKOUT
CLKODIV2
tCOPDIV2
Figure 5. System (MCLK) Clock Timing
Rev. 0 | Page 6 of 32
07241-035
Parameter
tXTIY
tMCLKDS
tXTIH
tXTIL
tCOP
tCOPDIV2
SSM2603
ABSOLUTE MAXIMUM RATINGS
At 25°C, unless otherwise noted.
THERMAL RESISTANCE
Table 7.
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Parameter
Supply Voltage
Input Voltage
Common-Mode Input Voltage
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
5V
VDD
VDD
−65°C to +150°C
−40°C to +85°C
−65°C to +165°C
300°C
Table 8. Thermal Resistance
Package Type
28-Lead, 5 mm × 5 mm LFCSP
ESD CAUTION
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.
Rev. 0 | Page 7 of 32
θJA
28
θJC
32
Unit
°C/W
SSM2603
28
27
26
25
24
23
22
SCLK
SDIN
CSB
MUTE
LLINEIN
RLINEIN
MICIN
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
1
2
3
4
5
6
7
PIN 1
INDICATOR
SSM2603
TOP VIEW
(Not to Scale)
21
20
19
18
17
16
15
MICBIAS
VMID
AGND
AVDD
ROUT
LOUT
PGND
07241-002
PBDAT
PBLRC
RECDAT
RECLRC
HPVDD
LHPOUT
RHPOUT
8
9
10
11
12
13
14
MCLK/XTI
XTO
DCVDD
DGND
DBVDD
CLKOUT
BCLK
Figure 6. Pin Configuration
Table 9. Pin Function Descriptions
Pin No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
Mnemonic
MCLK/XTI
XTO
DCVDD
DGND
DBVDD
CLKOUT
BCLK
PBDAT
PBLRC
RECDAT
RECLRC
HPVDD
LHPOUT
RHPOUT
PGND
LOUT
ROUT
AVDD
AGND
VMID
MICBIAS
MICIN
RLINEIN
LLINEIN
MUTE
CSB
SDIN
SCLK
GND Pad
Type
Digital Input
Digital Output
Digital Supply
Digital Ground
Digital Supply
Digital Output
Digital Input/Output
Digital Input
Digital Input/Output
Digital Output
Digital Input/Output
Analog Supply
Analog Output
Analog Output
Analog Ground
Analog Output
Analog Output
Analog Supply
Analog Ground
Analog Output
Analog Output
Analog Input
Analog Input
Analog Input
Digital Input
Digital Input
Digital Input/Output
Digital Input
Thermal Pad
Description
Master Clock Input/Crystal Input.
Crystal Output.
Digital Core Supply.
Digital Ground.
Digital I/O Supply.
Buffered Clock Output.
Digital Audio Bit Clock.
DAC Digital Audio Data Input, Playback Function.
DAC Sampling Rate Clock, Playback Function (from Left and Right Channels).
ADC Digital Audio Data Output, Record Function.
ADC Sampling Rate Clock, Record Function (from Left and Right Channels).
Headphone Supply.
Headphone Output for Left Channel.
Headphone Output for Right Channel.
Headphone Ground.
Line Output for Left Channel.
Line Output for Right Channel.
Analog Supply.
Analog Ground.
Midrail Voltage Decoupling Input.
Microphone Bias.
Microphone Input Signal.
Line Input for Right Channel.
Line Input for Left Channel.
DAC Output Mute, Active Low
2-Wire Control Interface I2C Address Selection.
2-Wire Control Interface Data Input/Output.
2-Wire Control Interface Clock Input.
Center Thermal Pad. Connect to PCB ground layer.
Rev. 0 | Page 8 of 32
SSM2603
TYPICAL PERFORMANCE CHARACTERISTICS
0
–10
–10
–20
–20
–30
–30
–40
–50
–60
–40
–50
–60
–70
–70
–80
–80
–90
–90
–100
–100
0.25
0.50
0.75
1.00
1.25
1.50
1.75
2.00
FREQUENCY (fS)
0
0.03
0.03
0.02
0.02
MAGNITUDE (dB)
0.04
0.01
0
−0.01
−0.02
0.25
0.30
0.35
FREQUENCY (fS)
0.40
0.45
1.75
2.00
−0.02
−0.04
0.20
1.50
0
−0.04
0.15
1.25
−0.01
−0.03
0.10
1.00
0.01
−0.03
0.50
07241-004
MAGNITUDE (dB)
0.05
0.04
0.05
0.75
Figure 9. DAC Digital Filter Frequency Response
0.05
0
0.50
FREQUENCY (fS)
Figure 7. ADC Digital Filter Frequency Response
−0.05
0.25
Figure 8. ADC Digital Filter Ripple
−0.05
0
0.05
0.10
0.15
0.20
0.25
0.30
0.35
FREQUENCY (fS)
Figure 10. DAC Digital Filter Ripple
Rev. 0 | Page 9 of 32
0.40
0.45
0.50
07241-006
0
07241-005
MAGNITUDE (dB)
0
07241-003
MAGNITUDE (dB)
CONVERTER FILTER RESPONSE
SSM2603
DIGITAL DE-EMPHASIS
0
0.4
−1
0.3
−2
0.2
MAGNITUDE (dB)
MAGNITUDE (dB)
−3
−4
−5
−6
−7
0.1
0
−0.1
−0.2
−8
−0.3
0
4
8
12
16
FREQUENCY (kHz)
−0.4
07241-007
−10
0
4
8
12
16
20
07241-010
−9
FREQUENCY (kHz)
Figure 14. De-Emphasis Error, Audio Sampling Rate = 44.1 kHz
Figure 11. De-Emphasis Frequency Response, Audio Sampling Rate = 32 kHz
0
0.4
−1
0.3
−2
−3
MAGNITUDE (dB)
0.1
0
−0.1
−0.2
−6
−7
−9
4
8
12
16
−10
07241-008
0
FREQUENCY (kHz)
0
4
8
12
16
20
24
FREQUENCY (kHz)
Figure 15. De-Emphasis Frequency Response, Audio Sampling Rate = 48 kHz
Figure 12. De-Emphasis Error, Audio Sampling Rate = 32 kHz
0
0.4
−1
0.3
−2
0.2
MAGNITUDE (dB)
−3
MAGNITUDE (dB)
−5
−8
−0.3
−0.4
−4
07241-011
MAGNITUDE (dB)
0.2
−4
−5
−6
−7
0.1
0
−0.1
−0.2
−8
−0.4
0
4
8
12
FREQUENCY (kHz)
16
20
07241-009
−10
0
4
8
12
16
20
24
FREQUENCY (kHz)
Figure 13. De-Emphasis Frequency Response, Audio Sampling Rate = 44.1 kHz
Rev. 0 | Page 10 of 32
Figure 16. De-Emphasis Error, Audio Sampling Rate = 48 kHz
07241-012
−0.3
−9
SSM2603
THEORY OF OPERATION
DIGITAL CORE
ADC HIGH-PASS AND DAC DE-EMPHASIS FILTERS
Inside the SSM2603 digital core is one central clock source,
called the master clock (MCLK), that produces a reference clock
for all internal audio data processing and synchronization.
When using an external clock source to drive the MCLK pin,
great care should be taken to select a clock source with less than
50 ps of jitter. Without careful generation of the MCLK signal,
the digital audio quality will most likely suffer.
The ADC and DAC employ separate digital filters that perform
24-bit signal processing. The digital filters are used for both record
and playback modes and are optimized for each individual
sampling rate used.
To allow an external device to generate the central reference
clock, apply the external clock signal directly through the
MCLK/XTI input pin. In this configuration, the oscillator
circuit of the SSM2603 can be powered down by using the OSC
bit (Register R6, Bit D5) to reduce power consumption.
To accommodate applications with very high frequency master
clocks, the internal core reference clock of the SSM2603 can be
set to either MCLK or MCLK divided by 2. This is enabled by
adjusting the setting of the CLKDIV2 bit (Register R8, Bit D6).
Complementary to this feature, the CLKOUT pin can also drive
external clock sources with either the core clock signal or core
clock divided by 2 by enabling the CLKODIV2 bit (Register R8,
Bit D7).
ADC AND DAC
The SSM2603 contains a pair of oversampling Σ-Δ ADCs. The
maximum ADC full-scale input level is 1.0 V rms when AVDD
= 3.3 V. If the input signal to the ADC exceeds this level, data
overloading occurs and causes audible distortion.
The ADC can accept analog audio input from either the stereo
line inputs or the monaural microphone input. Note that the
ADC can only accept input from a single source, so the user
must choose either the line inputs or the microphone input as
the source using the INSEL bit (Register R4, Bit D2). The digital
data from the ADC output, once converted, is processed using
the ADC filters.
For playback mode operations, the DAC filters convert the
digital audio interface data to oversampled data, using a sampling
rate selected by the user. The oversampled data is processed by
the DAC and then is sent to the analog output mixer by
enabling the DACSEL (Register R4, Bit D4).
Users have the option of setting up the device so that any dc
offset in the input source signal is automatically detected and
removed. To accomplish this, enable the digital high-pass filter
(see Table 2 for characteristics) contained in the ADC digital
filters by using the ADCHPF bit (Register R5, Bit D0).
In addition, users can implement digital de-emphasis by using
the DEEMPH bits (Register R5, Bit D1 and Bit D2).
HARDWARE MUTE PIN
The MUTE pin is a hardware mute pin that puts the DAC
output of the SSM2603 codec into a silent state. When MUTE is
activated and the codec enters a mute state, the playback output
voltage settles to VMID. The enabling of MUTE is shown in
Figure 17.
PLAYBACK
OUTPUT
WAVEFORM
Complementary to the ADC channels, the SSM2603 contains a
pair of oversampling Σ-Δ DACs that convert the digital audio
data from the internal DAC filters into an analog audio signal.
The DAC output can also be muted by setting the DACMU bit
(Register R5, Bit D3) in the control register.
Rev. 0 | Page 11 of 32
102,400/MCLK
MUTE
07241-018
To enable the SSM2603 to generate the central reference clock in a
system, connect a crystal oscillator between the MCLK/XTI input
pin and the XTO output pin.
For recording mode operations, the unprocessed data from the
ADC enters the ADC filters and is converted to the appropriate
sampling frequency, and then is output to the digital audio
interface.
Figure 17. Enabling of MUTE
SSM2603
AUTOMATIC LEVEL CONTROL (ALC)
The SSM2603 codec has an automatic level control (ALC) that
can be activated to suppress clipping and improve dynamic
range even if a sudden, loud input signal is introduced. This is
achieved by continuously adjusting the PGA gain so that the
signal level at the ADC input remains constant.
Decay (Gain Ramp-Up) Time
Decay time is the time taken for the PGA gain to ramp up to
90% of its range. The time for the recording level to return to its
target value, therefore, depends on both the decay time and the
gain adjustment required. If the gain adjustment is small, the
time to return to the target value will be less than the decay time.
Attack (Gain Ramp-Down) Time
return to its target value, therefore, depends on both the attack
time and the gain adjustment required. If the gain adjustment is
small, the time to return to the target value will be less than the
attack time.
Noise Gate
When the ALC function is enabled but the input signal is silent
for long periods, an audible hissing sound may be introduced by a
phenomenon called noise pumping. To prevent this occurrence, the
SSM2603 employs a noise gate function. A user-selected threshold
can be set by using the NGTH bits (Register R18, Bit D3 to Bit D7).
When the noise gate is enabled, the ADC output is either muted or
held at a constant gain to prevent the noise-pumping phenomenon.
For more information about the noise gate settings, see Table 41.
Attack time is the time taken for the PGA gain to ramp down
through 90% of its range. The time for the recording level to
INPUT SIGNAL
PGA
SIGNAL
AFTER
ALC
DECAY TIME
ATTACK TIME
Figure 18. PGA and ALC Decay Time and Attack Time Definitions
Rev. 0 | Page 12 of 32
07241-021
ALC TARGET
VALUE
SSM2603
ANALOG INTERFACE
GAIN =
The SSM2603 includes stereo single-ended line and monaural
microphone inputs to the on-board ADC. Either the line inputs
or the microphone input, but not both simultaneously, can be
connected to the ADC by setting the INSEL bit (Register R4,
Bit D2). In addition, the line or microphone inputs can be routed
and mixed directly to the output terminals via the SIDETONE_EN
(Register R4, Bit D5) and BYPASS (Register R4, Bit D3) bits.
The SSM2603 also includes line and headphone outputs from
the on-board DAC.
REXT
50kΩ
10kΩ
MICIN
LINEIN
ADC
OR
SIDETONE
VMID
AGND
The SSM2603 contains a set of single-ended stereo line inputs
(RLINEIN and LLINEIN) that are internally biased to VMID
by a voltage divider placed between AVDD and AGND. The
line input signal can be connected to the internal ADC and, if
desired, routed directly to the outputs via the bypass path by
using the BYPASS bit (Register R4, Bit D3).
0dB/20dB/40dB
GAIN BOOST
AVDD
Stereo Line and Monaural Microphone Inputs
INTERNAL CIRCUITRY
Figure 20. Microphone Input to ADC
The first gain stage is composed of a low noise operational
amplifier set to an inverting configuration with integrated
50 kΩ feedback and 10 kΩ input resistors. The default
microphone input signal gain is 14 dB. An external resistor
(REXT) can be connected in series with the MICIN pin to reduce
the first-stage gain of the microphone input signal to as low as
0 dB by using the following equation:
AVDD
Microphone Input Gain = 50 kΩ/(10 kΩ + REXT)
–
+
ADC
OR
BYPASS
07241-031
VMID
50kΩ
(REXT + 10kΩ)
07241-032
Signal Chain
AGND
Figure 19. Line Input to ADC
The line input volume can be adjusted from −34.5 dB to +33 dB
in steps of +1.5 dB by setting the LINVOL (Register R0, Bit D0 to
Bit D5) and RINVOL (Register R1, Bit D0 to Bit D5) bits. Volume
control, by default, is independently adjustable on both right and
left line inputs. However, the LRINBOTH or RLINBOTH bit, if
selected, simultaneously loads both sets of volume control with
the same value. The user can also set the LINMUTE (Register R0,
Bit D7) and RINMUTE (Register R1, Bit D7) bits to mute the line
input signal to the ADC.
The high impedance, low capacitance monaural microphone
input pin (MICIN) has two gain stages and a microphone bias
level (MICBIAS) that is internally biased to the VMID voltage
level by a voltage divider placed between AVDD and AGND.
The microphone input signal can be connected to the internal
ADC and, if desired, routed directly to the outputs via the sidetone
path by using the SIDETONE_EN bit (Register R4, Bit D5).
The second-stage gain of the microphone signal path is derived
from the internal microphone boost circuitry. The available
settings are 0 dB, 20 dB, and 40 dB and are controlled by the
MICBOOST (Register R4, Bit D0) and MICBOOST2 (Register R4,
Bit D8) bits. To achieve 20 dB of secondary gain boost, the user
can select either MICBOOST or MICBOOST2. To achieve 40 dB
of secondary microphone signal gain, the user must select both
MICBOOST and MICBOOST2.
In similar functionality to the line inputs, the MUTEMIC bit
(Register R4, Bit D1) can be set to mute the microphone input
signal to the ADC.
Note that when sourcing audio data from both line and
microphone inputs, the maximum full-scale input of the ADC
is 1.0 V rms when AVDD = 3.3 V. Do not source any input
voltage larger than full scale to avoid overloading the ADC,
which causes distortion of sound and deterioration of audio
quality. For best sound quality in both microphone and line
inputs, gain should be carefully configured so that the ADC
receives a signal equal to its full scale. This maximizes the
signal-to-noise ratio for best total audio quality.
Rev. 0 | Page 13 of 32
SSM2603
The line and microphone inputs can be routed and mixed directly
to the output terminals via the SIDETONE_EN (Register R4,
Bit D5) and BYPASS (Register R4, Bit D3) software control register
selections. In both of these modes, the analog input signal is routed
directly to the output terminals and is not digitally converted. The
bypass signal at the output mixer is the same level as the output of
the PGA associated with each line input.
The sidetone signal at the output mixer must be attenuated by a
range of −6 dB to −15 dB in steps of −3 dB by configuring the
SIDETONE_ATT (Register R4, Bit D6 and Bit D7) control
register bits. The selected level of attenuation occurs after the
initial microphone signal amplification from the microphone
first- and second-stage gains.
Line and Headphone Outputs
The DAC outputs, the microphone (the sidetone path), and the
line inputs (the bypass path) are summed at an output mixer.
This output signal can be present at both the stereo line outputs
and stereo headphone outputs.
BYPASS
LINE
INPUT
SIDETONE
MICROPHONE
INPUT
DACSEL
LINE OUTPUT
AND
HEADPHONE
OUTPUT
DAC
OUTPUT
AVDD
AGND
DAC/
SIDETONE/
BYPASS
AVDD
–
VMID
+
AGND
xHPOUT
Figure 22. Headphone Output
In similar functionality to the line inputs, the LHPOUT and
RHPOUT volumes, by default, are independently adjusted by
setting the LHPVOL (Register R2, Bit D0 to Bit D6) and RHPVOL
(Register R3, Bit D0 to Bit D6) bits of the headphone output
control registers. The headphone outputs can be muted by writing
codes less than 0110000 to the LHPVOL and RHPVOL bits. The
user is also able to simultaneously load the volume control of
both channels by writing to the LRHPBOTH (Register R2, Bit D8)
and RLHPBOTH (Register R3, Bit D8) bits of the left- and rightchannel DAC volume registers.
The maximum output level of the headphone outputs is 1.0 V rms
when AVDD and HPVDD = 3.3 V. To suppress audible pops
and clicks, the headphone and line outputs are held at the
VMID dc voltage level when the device is set to standby mode
or in the event that the headphone outputs are muted.
The stereo line outputs of the SSM2603, the LOUT and
ROUT pins, are able to drive a load impedance of 10 kΩ and
50 pF. The line output signal levels are not adjustable at the output
mixer, having a fixed gain of 0 dB. The maximum output level
of the line outputs is 1.0 V rms when AVDD = 3.3 V.
07241-033
VMID
The SSM2603 has a set of efficient headphone amplifier
outputs, LHPOUT and RHPOUT, that are able to drive 16 Ω or
32 Ω headphone speakers.
07241-034
Bypass and Sidetone Paths to Output
Figure 21. Output Signal Chain
Rev. 0 | Page 14 of 32
SSM2603
DIGITAL AUDIO INTERFACE
Digital Audio Data Sampling Rate
The digital audio input can support the following four digital audio
communication protocols: right-justified mode, left-justified mode,
I2S mode, and digital signal processor (DSP) mode.
To accommodate a wide variety of commonly used DAC and
ADC sampling rates, the SSM2603 allows for two modes of
operation, normal and USB, selected by the USB bit (Register R8,
Bit D0).
The mode selection is performed by writing to the FORMAT bits
of the digital audio interface register (Register R7, Bit D1 and
Bit D0). All modes are MSB first and operate with data of 16
to 32 bits.
In normal mode, the SSM2603 supports digital audio sampling
rates from 8 kHz to 96 kHz. Normal mode supports 256 fS and
384 fS based clocks. To select the desired sampling rate, the user
must set the appropriate sampling rate register in the SR control bits
(Register R8, Bit D2 to Bit D5) and match this selection to the
core clock frequency that is pulsed on the MCLK pin. See Table 29
and Table 30 for guidelines.
Recording Mode
On the RECDAT output pin, the digital audio interface can
send digital audio data for recording mode operation. The
digital audio interface outputs the processed internal ADC
digital filter data onto the RECDAT output. The digital audio
data stream on RECDAT comprises left- and right-channel
audio data that is time domain multiplexed.
In USB mode, the SSM2603 supports digital audio sampling rates
from 8 kHz to 96 kHz. USB mode is enabled on the SSM2603
to support the common universal serial bus (USB) clock rate of
12 MHz, or to support 24 MHz if the CLKDIV2 control register
bit is activated. The user must set the appropriate sampling rate
in the SR control bits (Register R8, Bit D2 to Bit D5). See Table 29
and Table 30 for guidelines.
The RECLRC is the digital audio frame clock signal that separates
left- and right-channel data on the RECDAT lines.
The BCLK signal acts as the digital audio clock. Depending on
if the SSM2603 is in master or slave mode, the BCLK signal is
either an input or an output signal. During a recording operation,
RECDAT and RECLRC must be synchronous to the BCLK signal
to avoid data corruption.
Note that the sampling rate is generated as a fixed divider from
the MCLK signal. Because all audio processing references the
core MCLK signal, corruption of this signal, in turn, corrupts
the outgoing audio quality of the SSM2603. The BCLK/RECLRC/
RECDAT or BCLK/PBLRC/PBDAT signals must be synchronized
with MCLK in the digital audio interface circuit. MCLK must
be faster or equal to the BCLK frequency to guarantee that no
data is lost during data synchronization.
Playback Mode
On the PBDAT input pin, the digital audio interface can receive
digital audio data for playback mode operation. The digital audio
data stream on PBDAT comprises left- and right-channel audio
data that is time domain multiplexed. The PBLRC is the digital
audio frame clock signal that separates left- and right-channel
data on the PBDAT lines.
The BCLK frequency should be greater than
Sampling Rate × Word Length × 2
Ensuring that the BCLK frequency is greater than this value
guarantees that all valid data bits are captured by the digital audio
interface circuitry. For example, if a 32 kHz digital audio sampling
rate with a 32-bit word length is desired, BCLK ≥ 2.048 MHz.
The BCLK signal acts as the digital audio clock. Depending on
whether the SSM2603 is in master or slave mode, the BCLK
signal is either an input or an output signal. During a playback
operation, PBDAT and PBLRC must be synchronous to the
BCLK signal to avoid data corruption.
1/fS
LEFT CHANNEL
RIGHT CHANNEL
RECLRC/
PBLRC
BCLK
1
2
3
4
N
X
X
1
2
3
N
X
X
07241-013
RECDAT/
PBDAT
X = DON’T CARE.
Figure 23. Left-Justified Audio Input Mode
Rev. 0 | Page 15 of 32
SSM2603
1/fS
LEFT CHANNEL
RIGHT CHANNEL
RECLRC/
PBLRC
BCLK
X
X
N
4
3
2
1
X
X
N
4
3
2
1
N
X
07241-014
RECDAT/
PBDAT
X = DON’T CARE.
Figure 24. Right-Justified Audio Input Mode
1/fS
LEFT CHANNEL
RIGHT CHANNEL
RECLRC/
PBLRC
BCLK
X
1
2
3
4
N
X
X
1
2
3
07241-015
RECDAT/
PBDAT
X = DON’T CARE.
Figure 25. I2S Audio Input Mode
1/fS
LEFT CHANNEL
RIGHT CHANNEL
RECLRC/
PBLRC
BCLK
1
2
3
N
1
2
N
3
X
X
X
07241-016
RECDAT/
PBDAT
X = DON’T CARE.
Figure 26. DSP/Pulse Code Modulation (PCM) Mode Audio Input Submode 1 (SM1) [Bit LRP = 0]
1/fS
LEFT CHANNEL
RIGHT CHANNEL
RECLRC/
PBLRC
BCLK
X
1
2
3
N
1
2
3
N
X
X
07241-017
RECDAT/
PBDAT
X = DON’T CARE.
Figure 27. DSP/PCM Mode Audio Input Submode 2 (SM2) [Bit LRP = 1]
Rev. 0 | Page 16 of 32
SSM2603
SDIN generates the serial control data-word, SCLK clocks the
serial data, and CSB determines the I2C device address. If the
CSB pin is set to 0, the address selected is 0011010; if 1, the
address is 0011011.
SOFTWARE CONTROL INTERFACE
The software control interface provides access to the user-selectable
control registers and can operate with a 2-wire (I2C) interface.
Within each control register is a control data-word consisting of
16 bits, MSB first. Bit B15 to Bit B9 are the register map address,
and Bit B8 to Bit B0 are register data for the associated register map.
SCLK
S
START
1 TO 7
8
9
ADDR
R/W
ACK
8
1 TO 7
SUBADDRESS
9
1 TO 7
ACK
DATA
8
9
P
ACK
STOP
07241-019
SDIN
Figure 28. 2-Wire I2C Generalized Clocking Diagram
WRITE
SEQUENCE
S
A7
...
A1
A0
A(S)
B15 ...
B9
B8
A(S)
B7
...
B0
P
A(S)
0
DEVICE
ADDRESS
READ
SEQUENCE
S
A7
...
A1
REGISTER
ADDRESS
A0
A(S)
B15
...
REGISTER
DATA
B9
0
A(S)
S
A7
...
A1
0
DEVICE
ADDRESS
A0
A(S)
B7
...
B0
A(M)
0
...
0
B8
A(M)
P
1
REGISTER
ADDRESS
DEVICE
ADDRESS
07241-022
S/P = START/STOP BIT.
A0 = I2C R/W BIT.
A(S) = ACKNOWLEDGE BY SLAVE.
A(M) = ACKNOWLEDGE BY MASTER.
A(M) = ACKNOWLEDGE BY MASTER (INVERSION).
REGISTER
DATA
(SLAVE DRIVE)
Figure 29. I2C Write and Read Sequences
Rev. 0 | Page 17 of 32
SSM2603
TYPICAL APPLICATION CIRCUITS
AVDD
VMID AGND
DBVDD DGND DCVDD
HPVDD
PGND
SSM2603
PWROFF
REF
BYPASS
MICBIAS
SIDETONE
ADC
RLINEIN
MUX
DAC
ADC
RHPOUT
DAC
ROUT
DIGITAL
PROCESSOR
MICIN
OUT
MIC
LOUT
ADC
MUX
LLINEIN
DAC
LHPOUT
LINE
SIDETONE
BYPASS
CLKOUT
OSC
MCLK/XTI
CLK GEN
XTO
CLKOUT
DIGITAL AUDIO INTERFACE
CONTROL INTERFACE
PBDAT RECDAT BCLK PBLRC RECLRC MUTE CSB
07241-020
OSC
SDIN SCLK
Figure 30. Power Management Functional Location Diagram (Control Register R6, Bit D0 to Bit D7)
+3.3V_VAA
L2
FB
L1
FB
C23
0.1uF
C21
10uF +
C20
0.1uF
+
C22
10uF
+3,3V_VDD
3
5
C24
0.1uF
+
C25
10uF
1uF
C4
220PF
24
L_LINE_IN
ROUT
R_LINE_IN
LOUT
J4
C12
1uF
R11
100
17
BNC
J5
1uF
21
MIC_BIAS
22
MIC_IN
I2S[0..4]
RHP_OUT
PBLRC
PBDAT
RECDAT
RECLRC
BCLK
R6 NC
CSB
SDIN
SCLK
R8
25
26
27
28
2
CLKOUT
6
R14
47K
MUTE
CSB
SDIN
SCLK
VMID
0
1
220PF
20
PHONEJACK STEREO SW
C6
0.1uF
MCLK/XTI
R13
47K
1
2
3
4
5
+
C3
10uF
2
12.288MHz
C7
22pF
C8
22pF
POR/XTO
DVSS
Y1
4
1uF
R10
47K
J6
C27
220PF
AVSS
HPVSS
C11
220PF
R9
47K
220uF
SPI[0..2]
R15
47K
220uF
14
C26
R5 100K
1
C10
9
8
10
11
7
19
15
MIC_IN
R7
680
13
SSM2603KCPZ
DACLRC
DACDAT
ADCDAT
ADCLRC
BCLK
+3.3V_VAA
J7
LHP_OUT
C15
C5
220PF
NC
+
2
R4
R
+
1
1
R12
100
C13
1uF
C14
2
16
2
R3
0
+
BNC
23
J2
1
Connection under chip
Figure 31. Typical Application Circuit
Rev. 0 | Page 18 of 32
07241-023
NC
L
+
C2
R2
2
U1
DBVDD
1
12
18
C1
DCVDD
R1
0
C19
0.1uF
AVDD
J1
+
HPVDD
C18
10uF
SSM2603
REGISTER MAP
Table 10. Register Map
Reg. Address Name
D8
R0 0x00
Left-Channel
LRINBOTH
ADC Input Volume
D7
LINMUTE
D6
0
R1
0x01
RLINBOTH
RINMUTE
0
R2
0x02
LRHPBOTH
LZCEN
LHPVOL [6:0]
001111001
R3
0x03
RLHPBOTH
RZCEN
RHPVOL [6:0]
001111001
R4
R5
R6
0x04
0x05
0x06
R7
R8
R9
R15
R16
R17
R18
0x07
0x08
0x09
0x0F
0x10
0x11
0x12
Right-Channel
ADC Input Volume
Left-Channel
DAC Volume
Right-Channel
DAC Volume
Analog Audio Path
Digital Audio Path
Power
Management
Digital Audio I/F
Sampling Rate
Active
Software Reset
ALC Control 1
ALC Control 2
Noise Gate
D5
D4
D3
D2
LINVOL [5:0]
SIDETONE_EN DACSEL BYPASS
0
HPOR
DACMU
OSC
OUT
DAC
0
0
0
LRSWAP
BCLKINV MS
CLKODIV2 CLKDIV2
0
0
ALCSEL [1:0]
D0
RINVOL [5:0]
MICBOOST2 SIDETONE_ATT [1:0]
0
0
0
0
PWROFF CLKOUT
0
0
D1
LRP
SR [3:0]
0
0
0
RESET [8:0]
MAXGAIN [2:0]
DCY [3:0]
NGTH [4:0]
Rev. 0 | Page 19 of 32
Default
010010111
010010111
INSEL
MUTEMIC MICBOOST 000001010
DEEMPH [1:0]
ADCHPF 000001000
ADC
MIC
LINEIN
010011111
WL [1:0]
0
FORMAT [1:0]
BOSR
USB
0
ACTIVE
ALCL [3:0]
ATK [3:0]
NGG [1:0]
NGAT
000001010
000000000
000000000
000000000
001111011
000110010
000000000
SSM2603
REGISTER MAP DETAILS
LEFT-CHANNEL ADC INPUT VOLUME, ADDRESS 0x00
Table 11. Left-Channel ADC Input Volume Register Bit Map
D8
LRINBOTH
D7
LINMUTE
D6
0
D5
D4
D3
D2
LINVOL [5:0]
D1
D0
Table 12. Descriptions of Left-Channel ADC Input Volume Register Bits
Bit Name
LRINBOTH
Description
Left-to-right line input ADC data load control
LINMUTE
Left-channel input mute
LINVOL [5:0]
Left-channel PGA volume control
Settings
0 = disable simultaneous loading of left-channel ADC data to rightchannel register (default)
1 = enable simultaneous loading of left-channel ADC data to rightchannel register
0 = disable mute
1 = enable mute on data path to ADC (default)
00 0000 = −34.5 dB
… In 1.5 dB steps
01 0111 = 0 dB (default)
… In 1.5 dB steps
01 1111 = 12 dB
10 0000 = 13.5 dB
10 0001 = 15 dB
10 0010 = 16.5 dB
10 0011 = 18 dB
10 0100 = 19.5 dB
10 0101 = 21 dB
10 0110 = 22.5 dB
10 0111 = 24 dB
10 1000 = 25.5 dB
10 1001 = 27 dB
10 1010 = 28.5 dB
10 1011 = 30 dB
10 1100 = 31.5 dB
10 1101 = 33 dB
11 1111 to 10 1101 = 33 dB
Rev. 0 | Page 20 of 32
SSM2603
RIGHT-CHANNEL ADC INPUT VOLUME, ADDRESS 0x01
Table 13. Right-Channel ADC Input Volume Register Bit Map
D8
RLINBOTH
D7
RINMUTE
D6
0
D5
D4
D3
D2
RINVOL [5:0]
D1
D0
Table 14. Descriptions of Right-Channel ADC Input Volume Register Bits
Bit Name
RLINBOTH
Description
Right-to-left line input ADC data load control
RINMUTE
Right-channel input mute
RINVOL [5:0]
Right-channel PGA volume control
Settings
0 = disable simultaneous loading of right-channel ADC data to leftchannel register (default)
1 = enable simultaneous loading of right-channel ADC data to leftchannel register
0 = disable mute
1 = enable mute on data path to ADC (default)
00 0000 = −34.5 dB
… In 1.5 dB steps
01 0111 = 0 dB (default)
… In 1.5 dB steps
01 1111 = 12 dB
10 0000 = 13.5 dB
10 0001 = 15 dB
10 0010 = 16.5 dB
10 0011 = 18 dB
10 0100 = 19.5 dB
10 0101 = 21 dB
10 0110 = 22.5 dB
10 0111 = 24 dB
10 1000 = 25.5 dB
10 1001 = 27 dB
10 1010 = 28.5 dB
10 1011 = 30 dB
10 1100 = 31.5 dB
10 1101 = 33 dB
11 1111 to 10 1101 = 33 dB
Rev. 0 | Page 21 of 32
SSM2603
LEFT-CHANNEL DAC VOLUME, ADDRESS 0x02
Table 15. Left-Channel DAC Volume Register Bit Map
D8
LRHPBOTH
D7
LZCEN
D6
D5
D4
D3
D2
LHPVOL [6:0]
D1
D0
Table 16. Descriptions of Left-Channel DAC Volume Register Bits
Bit Name
LRHPBOTH
Description
Left-to-right headphone volume load control
LZCEN
Left-channel zero cross detect enable
LHPVOL [6:0]
Left-channel headphone volume control
Settings
0 = disable simultaneous loading of left-channel headphone volume
data to right-channel register (default)
1 = enable simultaneous loading of left-channel headphone volume
data to right-channel register
0 = disable (default)
1 = enable
000 0000 to 010 1111 = mute
011 0000 = −73 dB
… In 1 dB steps
111 1001 = 0 dB (default)
… In 1 dB steps
111 1111 = +6 dB
RIGHT-CHANNEL DAC VOLUME, ADDRESS 0x03
Table 17. Right-Channel DAC Volume Register Bit Map
D8
RLHPBOTH
D7
RZCEN
D6
D5
D4
D3
D2
RHPVOL [6:0]
D1
D0
Table 18. Descriptions of Right-Channel DAC Volume Register Bits
Bit Name
RLHPBOTH
Description
Right-to-left headphone volume load control
RZCEN
Right-channel zero cross detect enable
RHPVOL [6:0]
Right-channel headphone volume control
Settings
0 = disable simultaneous loading of right-channel headphone
volume data to left-channel register (default)
1 = enable simultaneous loading of right-channel headphone
volume data to left-channel register
0 = disable (default)
1 = enable
000 0000 to 010 1111 = mute
011 0000 = −73 dB
… In 1 dB steps
111 1001 = 0 dB (default)
… In 1 dB steps
111 1111 = +6 dB
Rev. 0 | Page 22 of 32
SSM2603
ANALOG AUDIO PATH, ADDRESS 0x04
Table 19. Analog Audio Path Register Bit Map
D8
MICBOOST2
D7
D6
SIDETONE_ATT [1:0]
D5
SIDETONE_EN
D4
DACSEL
D3
BYPASS
D2
INSEL
D1
MUTEMIC
D0
MICBOOST
Table 20. Descriptions of Analog Audio Path Register Bits
Bit Name
MICBOOST2
Description
Additional microphone amplifier gain booster control.
SIDETONE_ATT [1:0]
Microphone sidetone gain control.
SIDETONE_EN
Sidetone enable. Allows attenuated microphone signal to
be mixed at device output terminal.
DACSEL
DAC select. Allows DAC output to be mixed at device
output terminal.
BYPASS
Bypass select. Allows line input signal to be mixed at
device output terminal.
INSEL
Line input or microphone input select to ADC.
MUTEMIC
Microphone mute control to ADC.
MICBOOST
Primary microphone amplifier gain booster control.
Settings
0 = 0 dB (default)
1 = 20 dB
00 = −6 dB (default)
01 = −9 dB
10 = −12 dB
11 = −15 dB
0 = sidetone disable (default)
1 = sidetone enable
0 = do not select DAC (default)
1 = select DAC
0 = bypass disable
1 = bypass enable (default)
0 = line input select to ADC (default)
1 = microphone input select to ADC
0 = mute on data path to ADC disable
1 = mute on data path to ADC enable (default)
0 = 0 dB (default)
1 = 20 dB
DIGITAL AUDIO PATH, ADDRESS 0x05
Table 21. Digital Audio Path Register Bit Map
D8
0
D7
0
D6
0
D5
0
D4
HPOR
D3
DACMU
D2
D1
DEEMPH [1:0]
D0
ADCHPF
Table 22. Descriptions of Digital Audio Path Register Bits
Bit Name
HPOR
Description
Stores dc offset when high-pass filter is disabled
DACMU
DAC digital mute
DEEMPH [1:0]
De-emphasis control
ADCHPF
ADC high-pass filter control
Rev. 0 | Page 23 of 32
Settings
0 = clear offset (default)
1 = store offset
0 = no mute (signal active)
1 = mute (default)
00 = no de-emphasis (default)
01 = 32 kHz sampling rate
10 = 44.1 kHz sampling rate
11 = 48 kHz sampling rate
0 = ADC high-pass filter enable (default)
1 = ADC high-pass filter disable
SSM2603
POWER MANAGEMENT, ADDRESS 0x06
Table 23. Power Management Register Bit Map
D8
0
D7
PWROFF
D6
CLKOUT
D5
OSC
D4
OUT
D3
DAC
D2
ADC
D1
MIC
D0
LINEIN
Table 24. Description of Power Management Register Bits
Bit Name
PWROFF
Description
Whole chip power-down control
CLKOUT
Clock output power-down control
OSC
Crystal power-down control
OUT
Output power-down control
DAC
DAC power-down control
ADC
ADC power-down control
MIC
Microphone input power-down control
LINEIN
Line input power-down control
Settings
0 = power up
1 = power down (default)
0 = power up (default)
1 = power down
0 = power up (default)
1 = power down
0 = power up
1 = power down (default)
0 = power up
1 = power down (default)
0 = power up
1 = power down (default)
0 = power up
1 = power down (default)
0 = power up
1 = power down (default)
Power Consumption
Table 25.
Mode
Record and Playback
Playback Only
Oscillator Enabled
External Clock
Record Only
Line Clock
Line Oscillator
Microphone 1
Microphone 2
Sidetone
(Microphone-toHeadphone
Output)
External Clock
Internally
Generated Clock
Analog Bypass
(Line Input or
Line Output)
External Line
Internally
Generated Line
Power-Down
External Clock
Oscillator
PWROFF
0
CLKOUT
0
OSC
0
OUT
0
DAC
0
ADC
0
MIC
0
LINEIN
0
AVDD
(3.3 V)
10.7
HPVDD
(3.3 V)
2.2
DCVDD
(3.3 V)
3.6
DBVDD
(3.3 V)
3.1
Unit
mA
0
0
0
1
0
1
0
0
0
0
1
1
1
1
1
1
5.2
5.1
2.2
2.2
1.7
1.7
1.8
1.7
mA
mA
0
0
0
0
0
0
0
0
0
1
0
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
0
0
0
0
1
1
4.7
4.7
4.8
4.8
N/A
N/A
N/A
N/A
2.0
2.0
2.0
2.0
1.9
1.8
1.9
1.8
mA
mA
mA
mA
0
0
0
0
1
1
0
0
1
1
1
1
0
0
1
1
2.0
2.0
2.2
2.2
0.2
0.2
1.7
1.7
mA
mA
0
0
0
0
1
1
0
0
1
1
1
1
1
1
0
0
2.0
2.0
2.2
2.2
0.2
0.2
1.7
1.7
mA
mA
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0.001
0.001
<0.001
<0.001
0.03
0.03
0.03
0.03
mA
mA
Rev. 0 | Page 24 of 32
SSM2603
DIGITAL AUDIO I/F, ADDRESS 0x07
Table 26. Digital Audio I/F Register Bit Map
D8
0
D7
BCLKINV
D6
MS
D5
LRSWAP
D4
LRP
D3
D2
WL [1:0]
D1
D0
FORMAT [1:0]
Table 27. Descriptions of Digital Audio I/F Register Bits
Bit Name
BCLKINV
Description
BCLK inversion control
MS
Master mode enable
LRSWAP
Swap DAC data control
LRP
Polarity control for clocks in right-justified,
left-justified, and I2S modes
WL [1:0]
Data-word length control
FORMAT [1:0]
Digital audio input format control
Settings
0 = BCLK not inverted (default)
1 = BCLK inverted
0 = enable slave mode (default)
1 = enable master mode
0 = output left- and right-channel data as normal (default)
1 = swap left- and right-channel DAC data in audio interface
0 = normal PBLRC and RECLRC (default), or DSP Submode 1
1 = invert PBLRC and RECLRC polarity, or DSP Submode 2
00 = 16 bits
01 = 20 bits
10 = 24 bits (default)
11 = 32 bits
00 = right justified
01 = left justified
10 = I2S mode (default)
11 = DSP mode
SAMPLING RATE, ADDRESS 0x08
Table 28. Sampling Rate Register Bit Map
D8
0
D7
CLKODIV2
D6
CLKDIV2
D5
D4
D3
SR [3:0]
D2
D1
BOSR
Table 29. Descriptions of Sampling Rate Register Bits
Bit Name
CLKODIV2
Description
CLKOUT divider select
CLKDIV2
Core clock divide select
SR [3:0]
BOSR
Clock setting condition
Base oversampling rate
USB
USB mode select
Settings
0 = CLKOUT is core clock (default)
1 = CLKOUT is core clock divided by 2
0 = core clock is MCLK (default)
1= core clock is MCLK divided by 2
See Table 30 and Table 31.
USB mode:
0 = support for 250 fS based clock (default)
1 = support for 272 fS based clock
Normal mode:
0 = support for 256 fS based clock (default)
1 = support for 384 fS based clock
0 = normal mode enable (default)
1 = USB mode enable
Rev. 0 | Page 25 of 32
D0
USB
SSM2603
Table 30. Sampling Rate Lookup Table, USB Disabled (Normal Mode)
MCLK (CLKDIV2 = 0)
12.288 MHz
MCLK (CLKDIV2 = 1)
24.576 MHz
11.2896 MHz
22.5792 MHz
18.432 MHz
36.864 MHz
16.9344 MHz
33.8688 MHz
1
ADC Sampling Rate
(RECLRC)
8 kHz (MCLK/1536)
8 kHz (MCLK/1536)
12 kHz (MCLK/1024)
16 kHz (MCLK/768)
24 kHz (MCLK/512)
32 kHz (MCLK/384)
48 kHz (MCLK/256)
48 kHz (MCLK/256)
96 kHz (MCLK/128)
8.0182 kHz (MCLK/1408)
8.0182 kHz (MCLK/1408)
11.025 kHz (MCLK/1024)
22.05 kHz (MCLK/512)
44.1 kHz (MCLK/256)
44.1 kHz (MCLK/256)
88.2 kHz (MCLK/128)
8 kHz (MCLK/2304)
8 kHz (MCLK/2304)
12 kHz (MCLK/1536)
16 kHz (MCLK/1152)
24 kHz (MCLK/768)
32 kHz (MCLK/576)
48 kHz (MCLK/384)
48 kHz (MCLK/384)
96 kHz (MCLK/192)
8.0182 kHz (MCLK/2112)
8.0182 kHz (MCLK/2112)
11.025 kHz (MCLK/1536)
22.05 kHz (MCLK/768)
44.1 kHz (MCLK/384)
44.1 kHz (MCLK/384)
88.2 kHz (MCLK/192)
DAC Sampling Rate
(PBLRC)
8 kHz (MCLK/1536)
48 kHz (MCLK/256)
12 kHz (MCLK/1024)
16 kHz (MCLK/768)
24 kHz (MCLK/512)
32 kHz (MCLK/384)
8 kHz (MCLK/1536)
48 kHz (MCLK/256)
96 kHz (MCLK/128)
8.0182 kHz (MCLK/1408)
44.1 kHz (MCLK/256)
11.025 kHz (MCLK/1024)
22.05 kHz (MCLK/512)
8.0182 kHz (MCLK/1408)
44.1 kHz (MCLK/256)
88.2 kHz (MCLK/128)
8 kHz (MCLK/2304)
48 kHz (MCLK/384)
12 kHz (MCLK/1536)
16 kHz (MCLK/1152)
24 kHz (MCLK/768)
32 kHz (MCLK/576)
48 kHz (MCLK/384)
8 kHz (MCLK/2304)
96 kHz (MCLK/192)
8.0182 kHz (MCLK/2112)
44.1 kHz (MCLK/384)
11.025 kHz (MCLK/1536)
22.05 kHz (MCLK/768)
8.0182 kHz (MCLK/2112)
44.1 kHz (MCLK/384)
88.2 kHz (MCLK/192)
BCLK frequency is for master mode and slave right-justified mode only.
Rev. 0 | Page 26 of 32
USB
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
SR [3:0]
0011
0010
0100
0101
1110
0110
0001
0000
0111
1011
1010
1100
1101
1001
1000
1111
0011
0010
0100
0101
1110
0110
0000
0001
0111
1011
1010
1100
1101
1001
1000
1111
BOSR
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
BCLK (MS = 1) 1
MCLK/4
MCLK/4
MCLK/4
MCLK/4
MCLK/4
MCLK/4
MCLK/4
MCLK/4
MCLK/2
MCLK/4
MCLK/4
MCLK/4
MCLK/4
MCLK/4
MCLK/4
MCLK/2
MCLK/6
MCLK/6
MCLK/6
MCLK/6
MCLK/6
MCLK/6
MCLK/6
MCLK/6
MCLK/3
MCLK/6
MCLK/6
MCLK/6
MCLK/6
MCLK/6
MCLK/6
MCLK/3
SSM2603
Table 31. Sampling Rate Lookup Table, USB Enabled (USB Mode)
MCLK (CLKDIV2 = 0)
12.000 MHz
1
MCLK (CLKDIV2 = 1)
24.000 MHz
ADC Sampling Rate
(RECLRC)
8 kHz (MCLK/1500)
8 kHz (MCLK/1500)
8.0214 kHz (MCLK/1496)
8.0214 kHz (MCLK/1496)
11.0259 kHz (MCLK/1088)
12 kHz (MCLK/1000)
16 kHz (MCLK/750)
22.0588 kHz (MCLK/544)
24 kHz (MCLK/500)
32 kHz (MCLK/375)
44.118 kHz (MCLK/272)
44.118 kHz (MCLK/272)
48 kHz (MCLK/250)
48 kHz (MCLK/250)
88.235 kHz (MCLK/136)
96 kHz (MCLK/125)
DAC Sampling Rate
(PBLRC)
8 kHz (MCLK/1500)
48 kHz (MCLK/250)
8.0214 kHz (MCLK/1496)
44.118 kHz (MCLK/272)
11.0259 kHz (MCLK/1088)
12 kHz (MCLK/1000)
16 kHz (MCLK/750)
22.0588 kHz (MCLK/544)
24 kHz (MCLK/500)
32 kHz (MCLK/375)
8.0214 kHz (MCLK/1496)
44.118 kHz (MCLK/272)
8 kHz (MCLK/1500)
48 kHz (MCLK/250)
88.235 kHz (MCLK/136)
96 kHz (MCLK/125)
BCLK frequency is for master mode and slave right-justified mode only.
Rev. 0 | Page 27 of 32
USB
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
SR [3:0]
0011
0010
1011
1010
1100
1000
1010
1101
1110
0110
1001
1000
0001
0000
1111
0111
BOSR
0
0
1
1
1
0
0
1
0
0
1
1
0
0
1
0
BCLK (MS = 1) 1
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
MCLK
SSM2603
ACTIVE, ADDRESS 0x09
Table 32. Active Register Bit Map
D8
0
D7
0
D6
0
D5
0
D4
0
D3
0
D2
0
D1
0
D0
ACTIVE
Table 33. Descriptions of Active Register Bit
Bit Name
ACTIVE
Description
Digital core activation control
Settings
0 = disable digital core (default)
1 = activate digital core
SOFTWARE RESET, ADDRESS 0x0F
Table 34. Software Reset Register Bit Map
D8
D7
D6
D5
D4
D3
D2
D1
D0
RESET [8:0]
Table 35. Descriptions of Software Reset Register Bits
Bit Name
RESET [8:0]
Description
Write all 0s to this register to set all registers to their default settings. Other data written to
this register has no effect.
Rev. 0 | Page 28 of 32
Settings
0 = reset (default)
SSM2603
ALC CONTROL 1, ADDRESS 0x10
Table 36. ALC Control 1 Register Bit Map
D8
D7
ALCSEL [1:0]
D6
D5
D4
MAXGAIN [2:0]
D3
D2
D1
ALCL [3:0]
D0
Table 37. Descriptions of ALC Control 1 Register Bits
Bit Name
ALCSEL [1:0]
Description
ALC select
MAXGAIN [2:0]
PGA maximum gain
ALCL [3:0]
ALC target level
Settings
00 = ALC disabled (default)
01 = ALC enabled on right channel only
10 = ALC enabled on left channel only
11 = ALC enabled on both channels
000 = −12 dB
001 = −6 dB
… In 6 dB steps
111 = 30 dB (default)
0000 = −28.5 dBFS
0001 = −27 dBFS
…
1011 = −12 dBFS (default)
… In 1.5 dB steps
1111 = −6 dBFS
ALC CONTROL 2, ADDRESS 0x11
Table 38. ALC Control 2 Register Bit Map
D8
0
D7
D6
D5
DCY [3:0]
D4
D3
D2
D1
ATK [3:0]
Table 39. Descriptions of ALC Control 2 Register Bits
Bit Name
DCY [3:0]
Description
Decay (release) time control
ATK [3:0]
ALC attack time control
Settings
0000 = 24 ms
0001 = 48 ms
0010 = 96 ms
0011 = 192 ms (default)
… (Time doubles with every step)
1010 = 24.576 sec
0000 = 6 ms
0001 = 12 ms
0010 = 24 ms (default)
… (Time doubles with every step)
1010 = 6.144 sec
Rev. 0 | Page 29 of 32
D0
SSM2603
NOISE GATE, ADDRESS 0x12
Table 40. Noise Gate Register Bit Map
D8
0
D7
D6
D5
NGTH [4:0]
D4
D3
D2
D1
NGG [1:0]
Table 41. Descriptions of Noise Gate Register Bits
Bit Name
NGTH [4:0]
Description
Noise gate threshold
NGG [1:0]
Noise gate type
NGAT
Noise gate control
1
Settings
00000 = −76.5 dBFS (default)
00001 = −75 dBFS
… In 1.5 dB steps
11110 = −31.5 dBFS
11111 = −30 dBFS
X0 = hold PGA gain constant (default) 1
01 = mute output
11 = reserved
0 = noise gate disable (default)
1 = noise gate enable
X = don’t care.
Rev. 0 | Page 30 of 32
D0
NGAT
SSM2603
OUTLINE DIMENSIONS
0.60 MAX
5.00
BSC SQ
0.60
MAX
22
PIN 1
INDICATOR
TOP VIEW
4.75
BSC SQ
0.50
BSC
0.50
0.40
0.30
PIN 1
INDICATOR
28
1
21
3.40
3.30 SQ
3.20
EXPOSED
PAD
(BOTTOM VIEW)
15
7
8
14
0.25 MIN
3.00 REF
SEATING
PLANE
12° MAX
0.80 MAX
0.65 TYP
0.30
0.23
0.18
0.05 MAX
0.02 NOM
COPLANARITY
0.05
0.20 REF
COMPLIANT TO JEDEC STANDARDS MO-220-VHHD-1
052407-B
1.00
0.85
0.80
Figure 32. 28-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
5 mm × 5 mm Body, Very Thin Quad
(CP-28-4)
Dimensions shown in millimeters
ORDERING GUIDE
Model
SSM2603CPZ-R2 1
SSM2603CPZ-REEL1
SSM2603CPZ-REEL71
SSM2603-EVALZ1
1
Temperature Range
−40°C to +85°C
−40°C to +85°C
−40°C to +85°C
Package Description
28-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
28-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
28-Lead Lead Frame Chip Scale Package [LFCSP_VQ]
Evaluation Board
Z = RoHS Compliant Part.
Rev. 0 | Page 31 of 32
Package Option
CP-28-4
CP-28-4
CP-28-4
SSM2603
NOTES
©2008 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D07241-0-2/08(0)
Rev. 0 | Page 32 of 32