CDB4349
Evaluation Board for CS4349
Features
Description
Stand-Alone or PC GUI Board Control
The CDB4349 evaluation board is an excellent platform
for quickly evaluating the CS4349 24-bit, 24-pin, stereo
D/A converter. Evaluation requires an analog signal analyzer, a digital signal source, a PC for controlling the
CS4349 (only required for Control Port Mode), and a
power supply. Analog line-level outputs are provided via
RCA phono jacks.
CS8416 Receives S/PDIF-Compatible Digital
Audio
Headers for External PCM Audio Input
Demonstrates Recommended Layout and
Grounding Arrangements.
Requires Only a Digital Signal Source and
Power Supplies for a Complete Digital-toAnalog Converter System
The CS8416 digital audio receiver IC provides the system timing necessary to operate the digital-to-analog
converter and will accept S/PDIF-compatible audio data. The evaluation board may also be configured to
accept external timing and data signals for operation in
a user application during system development.
ORDERING INFORMATION
CDB4349
Evaluation Board
Hardware or
Software Board
Control
Inputs for PCM
Clocks and Data
CS4349
Analog Outputs
and Filtering
CS8416
Digital Audio
Interface
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2008
(All Rights Reserved)
JUN '08
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CDB4349
TABLE OF CONTENTS
1. CDB4349 SYSTEM OVERVIEW ............................................................................................................ 4
2. CS4349 DIGITAL-TO-ANALOG CONVERTER ..................................................................................... 4
3. CS8416 DIGITAL AUDIO RECEIVER .................................................................................................... 4
4. INPUT FOR CLOCKS AND DATA ......................................................................................................... 4
5. INPUT FOR CONTROL DATA ............................................................................................................... 4
6. POWER SUPPLY CIRCUITRY ............................................................................................................... 5
7. GROUNDING AND POWER SUPPLY DECOUPLING .......................................................................... 5
8. ANALOG OUTPUT FILTERING ............................................................................................................. 5
9. BOARD CONNECTIONS AND SETTINGS ............................................................................................ 6
10. PERFORMANCE PLOTS ..................................................................................................................... 7
11. SCHEMATICS .................................................................................................................................... 13
12. LAYOUT ............................................................................................................................................. 20
13. REVISION HISTORY .......................................................................................................................... 23
LIST OF FIGURES
Figure 1. FFT 0 dBFS, FS = 48 kHz ........................................................................................................... 7
Figure 2. FFT -60 dBFS, FS = 48 kHz ........................................................................................................ 7
Figure 3. FFT No Input, FS = 48 kHz .......................................................................................................... 7
Figure 4. FFT No Input Out of Band, FS = 48 kHz ...................................................................................... 7
Figure 5. Frequency Response 0 dBFS, FS = 48 kHz ................................................................................ 7
Figure 6. THD+N vs Frequency 0 dBFS, FS = 48 kHz ............................................................................... 7
Figure 7. THD+N vs Level 1 kHz, FS = 48 kHz ........................................................................................... 8
Figure 8. Fade-to-Noise Linearity 1 kHz, FS = 48 kHz ............................................................................... 8
Figure 9. Impulse Response, FS = 48 kHz ................................................................................................. 8
Figure 10. FFT Crosstalk Ch. A to Ch. B 1 kHz, FS = 48 kHz .................................................................... 8
Figure 11. FFT Crosstalk Ch. B to Ch. A 1 kHz, FS = 48 kHz .................................................................... 8
Figure 12. FFT 0 dBFS, FS = 96 kHz ......................................................................................................... 8
Figure 13. FFT -60 dBFS, FS = 96 kHz ...................................................................................................... 9
Figure 14. FFT No Input, FS = 96 kHz ........................................................................................................ 9
Figure 15. FFT No Input Out of Band, FS = 96 kHz .................................................................................... 9
Figure 16. Frequency Response 0 dBFS, FS = 96 kHz .............................................................................. 9
Figure 17. THD+N vs Frequency 0 dBFS, FS = 96 kHz ............................................................................. 9
Figure 18. THD+N vs Level 1 kHz, FS = 96 kHz ......................................................................................... 9
Figure 19. Fade-to-Noise Linearity 1 kHz, FS = 96 kHz ........................................................................... 10
Figure 20. Impulse Response, FS = 96 kHz ............................................................................................. 10
Figure 21. FFT Crosstalk Ch. A to Ch. B 1 kHz, FS = 96 kHz .................................................................. 10
Figure 22. FFT Crosstalk Ch. B to Ch. A 1 kHz, FS = 96 kHz .................................................................. 10
Figure 23. FFT 0 dBFS, FS = 192 kHz ..................................................................................................... 10
Figure 24. FFT -60 dBFS, FS = 192 kHz .................................................................................................. 10
Figure 25. FFT No Input, FS = 192 kHz .................................................................................................... 11
Figure 26. FFT No Input Out of Band, FS = 192 kHz ................................................................................ 11
Figure 27. Frequency Response 0 dBFS, FS = 192 kHz .......................................................................... 11
Figure 28. THD+N vs Frequency 0 dBFS, FS = 192 kHz ......................................................................... 11
Figure 29. THD+N vs Level 1 kHz, FS = 192 kHz ..................................................................................... 11
Figure 30. Fade-to-Noise Linearity 1 kHz, FS = 192 kHz ......................................................................... 11
Figure 31. Impulse Response, FS = 192 kHz ........................................................................................... 12
Figure 32. FFT Crosstalk Ch. A to Ch. B 1 kHz, FS = 192 kHz ................................................................ 12
Figure 33. FFT Crosstalk Ch. B to Ch. A 1 kHz, FS = 192 kHz ................................................................ 12
Figure 34. System Block Diagram and Signal Flow .................................................................................. 13
Figure 35. CS4349 .................................................................................................................................... 14
Figure 36. Analog Outputs ........................................................................................................................ 15
Figure 37. PCM Input Header and Hardware Control ............................................................................... 16
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CDB4349
Figure 38. CS8416 S/PDIF Input .............................................................................................................. 17
Figure 39. Control Port .............................................................................................................................. 18
Figure 40. Power ....................................................................................................................................... 19
Figure 41. Silkscreen Top ......................................................................................................................... 20
Figure 42. Top Side ................................................................................................................................... 21
Figure 43. Bottom Side ............................................................................................................................. 22
LIST OF TABLES
Table 1. System Connections ..................................................................................................................... 6
Table 2. CDB4349 Jumper Settings ............................................................................................................ 6
Table 3. CDB4349 Switch Settings ............................................................................................................. 6
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CDB4349
1. CDB4349 SYSTEM OVERVIEW
The CDB4349 evaluation board is an excellent platform for quickly evaluating the CS4349. The CS8416 digital audio
interface receiver provides an easy interface to digital audio signal sources including the majority of digital audio test
equipment. The evaluation board also allows the user to supply external PCM clocks and data through headers for
system development.
The CDB4349 schematic has been partitioned into 6 pages, shown in Figures 35 through 40. Each schematic page
is represented in the system diagram shown in Figure 34. Notice that the system diagram also includes the interconnections between the partitioned schematics.
2. CS4349 DIGITAL-TO-ANALOG CONVERTER
A description of the CS4349 is included in the CS4349 datasheet, available at http://www.cirrus.com/en/products/pro/detail/P1116.html.
3. CS8416 DIGITAL AUDIO RECEIVER
The system receives and decodes the standard S/PDIF data format using a CS8416 digital audio receiver
(Figure 38). The outputs of the CS8416 include a serial bit clock, serial data, and a left-right clock. The CS8416 data
format is selected through switch S1. The operation of the CS8416 and a discussion of the digital audio interface is
included in the CS8416 datasheet, available at http://www.cirrus.com/en/products/pro/detail/P1005.html.
The CDB4349 has been designed so that the input can be either optical or coaxial (see Figure 39). However, both
inputs cannot be driven simultaneously.
After the CS8416 serial format is changed either through S1 in Stand-Alone Mode, or though the CDB4349 GUI in
PC Mode, a reset is required. The CS8416 can be manually reset using ‘HARDWARE RESET’ (S2) in Stand-Alone
Mode, or through software when operating the CDB4349 in PC Mode.
4. INPUT FOR CLOCKS AND DATA
The evaluation board has been designed to allow external PCM data input through header J10. The schematic for
the clock/data input is shown in Figure 37. In Stand-Alone Mode, switch position 6 of S4 selects the source as either
CS8416 (open) or header J10 (closed). In PC Mode, the PCM source is selected through software.
5. INPUT FOR CONTROL DATA
The evaluation board can be run in either a Stand-Alone Mode or with a PC. Stand-Alone Mode does not require
the use of a PC, and the mode pins are configured using switch positions 1 through 5 of S4 and switch positions 1
and 2 of S1. PC Mode uses software to set up the CS4349 through I²C® or SPI™ interface using the PC’s serial port
or USB port. When the serial port (RS232) or USB is attached and the CDB4349 software is running, PC Mode is
automatically selected.
Header J38 offers the option for external input of RST and SPI/I²C clocks and data. The board is set up from the
factory to use the on-board microcontroller in conjunction with software available at http://www.cirrus.com/en/products/software/msaudio.html. To use an external control source, remove the shunts on J38 and place a ribbon cable
so the signal lines are on the center row and the grounds are on the right side. R89 and R90 should be populated
with 2 kΩ resistors when using an external I²C source which does not already provide pull-ups.
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CDB4349
6. POWER SUPPLY CIRCUITRY
Power is supplied to the evaluation board by three binding posts (GND, +12V, and -12V), as shown in Figure 40.
The ‘+12V’ and ‘-12V’ terminals supply the active output filters. The +3.3 V and +5.0 V circuitry is powered by regulators fed by the ‘+12V’ terminal. Headers J3, J4, and J7 allow the user to either select +3.3 V or +5.0 V supplies
for the various CS4349 voltage supply pins. Alternatively, the user can remove the shunts on J3, J4, and J7, and
provide an external power supply.
WARNING: Refer to the CS4349 datasheet for maximum allowable voltage levels. Operation outside of this range
can cause permanent damage to the device.
7. GROUNDING AND POWER SUPPLY DECOUPLING
As with any high-performance converter, the CS4349 requires careful attention to power supply and grounding arrangements in order to optimize performance. Figure 35 details the connections to the CS4349 while Figures 41,
42, and 43 show the component placement and top and bottom layout. The decoupling capacitors are located as
close to the CS4349 as possible. Extensive use of ground plane fill in the evaluation board yields large reductions
in radiated noise.
8. ANALOG OUTPUT FILTERING
The passive output filter on the CDB4349 has been designed according to the CS4349 datasheet.
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CDB4349
9. BOARD CONNECTIONS AND SETTINGS
Board connections and settings are shown in Table 1, Table 2, and Table 3.
CONNECTOR
INPUT/OUTPUT
SIGNAL PRESENT
GND
Input
Ground connection from power supply
+12V
Input
+12 V positive supply for the on-board filtering
-12V
Input
-12 V negative supply for the on-board filtering
S/PDIF IN - J1
Input
Digital audio interface input via coax
S/PDIF IN - OPT1
Input
Digital audio interface input via optical
PCM INPUT - J10
Input
Input for master, serial, left/right clocks and serial data
POUTA, POUTB
Output
RCA line level analog outputs from passive output stage
Table 1. System Connections
JUMPER
PURPOSE
POSITION
FUNCTION SELECTED
J3, J4, J7
Selects Supply Voltage for
CS4349
+5V
*+3.3V
Supplies +5.0 V to associated CS4349 supply
*Supplies +3.3 V to associated CS4349 supply
J38
Selects source of control data
*PC CONTROL
shunts removed
*Control from PC and on-board microcontroller
External control input using center and right columns
J27
C2 micro programming
-
Reserved for factory use only
Table 2. CDB4349 Jumper Settings
*Default Factory Settings.
SWITCH
(Note 1)
PURPOSE
S2
S1
POSITION
FUNCTION SELECTED
Resets CS8416 and CS4349
The CS8416 must be reset if switch S1 is changed
CS8416 Format Select
SFSEL[1:0]
1, 2
Default: SFSEL[1:0] = 00 (Closed). See CS8416 datasheet
for details.
CS4349 Format Select
DIF[2:0]
1, 2, 3
Default: DIF[2:0] = 000 (Closed). See CS4349 datasheet
for details.
CS4349 De-emphasis Select
4
open = De-emphasis enabled
*closed = De-emphasis disabled.
CS4349 Popguard® Enable
5
open = Popguard enabled
*closed = Popguard disabled.
Selects PCM source for
CS4349
6
*open = CS8416
closed = PCM Header J10
S4
Table 3. CDB4349 Switch Settings
*Default Factory Settings.
Note:
1. Switch settings take effect in Stand-Alone Mode only.
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CDB4349
10.PERFORMANCE PLOTS
Test conditions (unless otherwise specified): TA = 25° C; Measurement bandwidth is 20 Hz to 20 kHz (unweighted);
VA = 5 V; VLC = VLS = 3.3 V; Input signal is a 0 dBFS 1 kHz sine wave; Input data resolution is 24 bits, Left-Justified; Channel A output = blue traces; Channel B output = green traces.
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
-50
-50
-60
d
B
r
-60
d
B
r
-70
-80
A
-70
-80
A
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
-140
-150
20
50
100
200
500
1k
2k
5k
10k
-150
20
20k
50
100
200
Hz
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
10k
20k
-60
d
B
r
-70
-70
-80
-80
A
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
-140
-150
-150
20
50
100
200
500
1k
2k
5k
10k
20k
20k
40k
60k
80k
100k
120k
Hz
Hz
Figure 3. FFT No Input, FS = 48 kHz
Figure 4. FFT No Input Out of Band, FS = 48 kHz
+5
+0
+4
-10
+3
-20
+2
-30
-40
+1
A
5k
-50
-60
d
B
r
2k
Figure 2. FFT -60 dBFS, FS = 48 kHz
-50
A
1k
Hz
Figure 1. FFT 0 dBFS, FS = 48 kHz
d
B
r
500
d
B
r
+0
-50
-60
A
-1
-70
-2
-80
-3
-90
-4
-5
20
-100
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 5. Frequency Response 0 dBFS, FS = 48 kHz
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-110
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 6. THD+N vs Frequency 0 dBFS, FS = 48 kHz
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CDB4349
+0
+40
+35
-10
+30
-20
+25
+20
-30
+15
-40
d
B
r
+10
d
B
r
-50
-60
A
A
+5
+0
-5
-10
-70
-15
-80
-20
-25
-90
-30
-100
-35
-110
-120
-100
-80
-60
-40
-20
-40
-140
+0
-120
-100
-80
dBFS
Figure 7. THD+N vs Level 1 kHz, FS = 48 kHz
-40
-20
+0
Figure 8. Fade-to-Noise Linearity 1 kHz, FS = 48 kHz
2
+0
1.75
-10
1.5
-20
1.25
-30
1
-40
750m
-50
500m
-60
0
d
B
r
-250m
A
250m
V
-60
dBFS
-70
-80
-90
-500m
-100
-750m
-110
-1
-120
-1.25
-130
-1.5
-140
-1.75
-2
0
500u
1m
1.5m
2m
2.5m
-150
20
3m
50
100
200
sec
2k
5k
10k
20k
Figure 10. FFT Crosstalk Ch. A to Ch. B 1 kHz,
FS = 48 kHz
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
-50
-50
-60
-60
d
B
r
-70
-70
-80
-80
A
A
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
-140
-150
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 11. FFT Crosstalk Ch. B to Ch. A 1 kHz,
FS = 48 kHz
8
1k
Hz
Figure 9. Impulse Response, FS = 48 kHz
d
B
r
500
-150
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 12. FFT 0 dBFS, FS = 96 kHz
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CDB4349
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
-50
-50
-60
-60
d
B
r
d
B
r
-70
-70
-80
-80
A
A
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
-140
-150
20
50
100
200
500
1k
2k
5k
10k
-150
20
20k
50
100
200
500
1k
2k
5k
10k
20k
Hz
Hz
Figure 13. FFT -60 dBFS, FS = 96 kHz
Figure 14. FFT No Input, FS = 96 kHz
+0
+5
-10
+4
-20
-30
+3
-40
+2
-50
-60
d
B
r
+1
d
B
r
-70
+0
-80
A
A
-90
-1
-100
-2
-110
-120
-3
-130
-4
-140
-150
20k
40k
60k
80k
100k
-5
20
120k
50
100
200
Hz
1k
2k
5k
10k
20k
Hz
Figure 15. FFT No Input Out of Band, FS = 96 kHz
Figure 16. Frequency Response 0 dBFS, FS = 96 kHz
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
d
B
r
500
d
B
r
-50
-50
-60
-60
A
A
-70
-70
-80
-80
-90
-90
-100
-100
-110
20
50
100
200
500
1k
2k
5k
10k
20k
-110
-120
-100
-80
-60
-40
-20
+0
Hz
dBFS
Figure 17. THD+N vs Frequency 0 dBFS, FS = 96 kHz
Figure 18. THD+N vs Level 1 kHz, FS = 96 kHz
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CDB4349
+40
2
+35
1.75
+30
1.5
+25
1.25
+20
1
+15
750m
+10
500m
d
B
r
+5
A
-5
-250m
-10
-500m
-15
-750m
250m
+0
V
0
-20
-1
-25
-1.25
-30
-1.5
-35
-1.75
-40
-140
-120
-100
-80
-60
-40
-20
-2
0
+0
250u
500u
750u
dBFS
Figure 19. Fade-to-Noise Linearity 1 kHz, FS = 96 kHz
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
-50
-50
-70
-80
A
A
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
-140
-150
20
50
100
200
500
1k
2k
5k
10k
-150
20
20k
50
100
200
500
Figure 21. FFT Crosstalk Ch. A to Ch. B 1 kHz,
FS = 96 kHz
2k
5k
10k
20k
Figure 22. FFT Crosstalk Ch. B to Ch. A 1 kHz,
FS = 96 kHz
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
-50
-50
-60
-60
d
B
r
-70
-70
-80
-80
A
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
-140
-150
20
50
100
200
500
1k
2k
5k
10k
Hz
Figure 23. FFT 0 dBFS, FS = 192 kHz
10
1k
Hz
Hz
A
1.5m
-60
d
B
r
-70
-80
d
B
r
1.25m
Figure 20. Impulse Response, FS = 96 kHz
-60
d
B
r
1m
sec
20k
-150
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 24. FFT -60 dBFS, FS = 192 kHz
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CDB4349
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
-50
-50
-60
-60
d
B
r
d
B
r
-70
-70
-80
-80
A
A
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
-140
-150
20
-150
50
100
200
500
1k
2k
5k
10k
20k
20k
40k
60k
80k
100k
120k
Hz
Hz
Figure 25. FFT No Input, FS = 192 kHz
Figure 26. FFT No Input Out of Band, FS = 192 kHz
+5
+0
+4
-10
-20
+3
-30
+2
-40
+1
d
B
r
d
B
r
+0
-50
-60
A
A
-1
-70
-2
-80
-3
-90
-4
-100
-5
20
50
100
200
500
1k
2k
5k
10k
-110
20
20k
50
100
200
500
1k
2k
5k
10k
20k
Hz
Hz
Figure 27. Frequency Response 0 dBFS, FS = 192 kHz
Figure 28. THD+N vs Frequency 0 dBFS, FS = 192 kHz
+40
+0
+35
-10
+30
+25
-20
+20
-30
+15
+10
-40
d
B
r
-50
d
B
r
-60
A
A
+5
+0
-5
-10
-70
-15
-80
-20
-25
-90
-30
-100
-35
-110
-120
-100
-80
-60
-40
-20
+0
dBFS
Figure 29. THD+N vs Level 1 kHz, FS = 192 kHz
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-40
-140
-120
-100
-80
-60
-40
-20
+0
dBFS
Figure 30. Fade-to-Noise Linearity 1 kHz, FS = 192 kHz
11
CDB4349
2
+0
1.75
-10
1.5
-20
1.25
-30
1
-40
750m
-50
500m
-60
d
B
r
250m
V
0
-70
-80
-250m
A
-90
-500m
-750m
-100
-1
-110
-1.25
-120
-1.5
-130
-1.75
-140
-2
0
200u
400u
-150
20
600u
sec
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 31. Impulse Response, FS = 192 kHz
Figure 32. FFT Crosstalk Ch. A to Ch. B 1 kHz,
FS = 192 kHz
+0
-10
-20
-30
-40
-50
-60
d
B
r
-70
-80
A
-90
-100
-110
-120
-130
-140
-150
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 33. FFT Crosstalk Ch. B to Ch. A 1 kHz,
FS = 192 kHz
12
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11.SCHEMATICS
PCM source select
Serial Control Port
Figure 3
PCM Header
Figure 3
Power
I 2 C/SPI Header
Figure 3
PCM Clocks/Data
PCM mux
Analog Outputs
PCM Clocks/Data
PCM Clocks/Data
POUTA
Figure 3
Figure 3
CS8416
S/PDIF
Input
CS4349
DIF[2:0]
POUTB
Figure 3
PCM source select
CS8416 serial port
format
Figure 3
Figure 4
Figure 3
Hardware Control
Switches
Figure 3
CDB4349
13
Figure 34. System Block Diagram and Signal Flow
14
Figure 35. CS4349
CDB4349
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15
CDB4349
Figure 36. Analog Outputs
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CDB4349
16
Figure 37. PCM Input Header and Hardware Control
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CDB4349
Figure 38. CS8416 S/PDIF Input
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Figure 39. Control Port
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Figure 40. Power
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12.LAYOUT
CS4349
CDB4349
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Figure 41. Silkscreen Top
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Figure 42. Top Side
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Figure 43. Bottom Side
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13.REVISION HISTORY
Release
DB1
DS782DB1
Date
June 2007
Changes
Initial Evaluation Board Datasheet Release
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Contacting Cirrus Logic Support
For all product questions and inquiries, contact a Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third
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does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED FOR USE
IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PRODUCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUSTOMER’S RISK AND CIRRUS DISCLAIMS AND MAKES NO WARRANTY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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Cirrus Logic, Cirrus, the Cirrus Logic logo designs, and Popguard are trademarks of Cirrus Logic, Inc. All other brand and product names in this document may be
trademarks or service marks of their respective owners.
I²C is a registered trademark of Philips Semiconductor.
SPI is a trademark of Motorola, Inc.
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