CDB4352
Evaluation Board for CS4352
Features
Description
Demonstrates Recommended Layout And
Grounding Arrangements
CS8416 Receives S/PDIF, & EIAJ-340-
Compatible Digital Audio
Headers for External PCM Audio
Requires Only a Digital Signal Source and
Power Supplies for a Complete Digital-toAnalog Converter System
The CDB4352 evaluation board is an excellent means
for quickly evaluating the CS4352 24-bit, high-performance stereo D/A converter. Evaluation requires an
analog signal analyzer, a digital signal source, and a
power supply. Analog line-level outputs are provided via
RCA phono jacks.
The CS8416 digital audio receiver IC provides the system timing necessary to operate the Digital-to-Analog
converter and will accept S/PDIF and EIAJ-340-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
CDB4352
Evaluation Board
Hardware Switches
Clocks/Data
Header
S/PDIF Input
(CS8416)
CS4352
Analog Output
(Line Level)
Mux
Muting
Reset
Reset
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2006
(All Rights Reserved)
SEPTEMBER '06
DS684DB1
CDB4352
TABLE OF CONTENTS
1. CDB4352 SYSTEM OVERVIEW ............................................................................................................ 4
2. CS4352 DIGITAL-TO-ANALOG CONVERTER ..................................................................................... 4
3. CS8416 DIGITAL AUDIO RECEIVER .................................................................................................... 4
4. INPUT FOR CLOCKS AND DATA ......................................................................................................... 4
5. POWER SUPPLY CIRCUITRY ............................................................................................................... 4
6. GROUNDING AND POWER SUPPLY DECOUPLING .......................................................................... 5
7. HARDWARE CONTROL ........................................................................................................................ 5
8. ANALOG OUTPUT FILTERING ............................................................................................................. 5
9. PERFORMANCE PLOTS ....................................................................................................................... 6
10. DESIGN NOTE ................................................................................................................................... 11
11. SCHEMATICS
.......................................................................... 12
12. REVISION HISTORY ......................................................................................................................... 21
LIST OF FIGURES
Figure 1. FFT (48 kHz, 0 dB) ...................................................................................................................... 6
Figure 2. FFT (48 kHz, -60 dB) ................................................................................................................... 6
Figure 3. FFT (48 kHz, No Input) ................................................................................................................ 6
Figure 4. FFT (48 kHz Out-of-Band, No Input) ............................................................................................ 6
Figure 5. 48 kHz, THD+N vs. Input Freq ..................................................................................................... 6
Figure 6. 48 kHz, THD+N vs. Level ............................................................................................................ 6
Figure 7. 48 kHz, Fade-to-Noise Linearity .................................................................................................. 7
Figure 8. 48 kHz, Frequency Response ...................................................................................................... 7
Figure 9. 48 kHz, Crosstalk ......................................................................................................................... 7
Figure 10. 48 kHz, Impulse Response ........................................................................................................ 7
Figure 11. FFT (96 kHz, 0 dB) .................................................................................................................... 7
Figure 12. FFT (96 kHz, -60 dB) ................................................................................................................. 7
Figure 13. FFT (96 kHz, No Input) .............................................................................................................. 8
Figure 14. FFT (96 kHz Out-of-Band, No Input) .......................................................................................... 8
Figure 15. 96 kHz, THD+N vs. Input Freq ................................................................................................... 8
Figure 16. 96 kHz, THD+N vs. Level .......................................................................................................... 8
Figure 17. 96 kHz, Fade-to-Noise Linearity ................................................................................................ 8
Figure 18. 96 kHz, Frequency Response .................................................................................................... 8
Figure 19. 96 kHz, Crosstalk ....................................................................................................................... 9
Figure 20. 96 kHz, Impulse Response ........................................................................................................ 9
Figure 21. FFT (192 kHz, 0 dB) .................................................................................................................. 9
Figure 22. FFT (192 kHz, -60 dB) ............................................................................................................... 9
Figure 23. FFT (192 kHz, No Input) ............................................................................................................ 9
Figure 24. FFT (192 kHz Out-of-Band, No Input) ........................................................................................ 9
Figure 25. 192 kHz, THD+N vs. Input Freq ............................................................................................... 10
Figure 26. 192 kHz, THD+N vs. Level ...................................................................................................... 10
Figure 27. 192 kHz, Fade-to-Noise Linearity ............................................................................................ 10
Figure 28. 192 kHz, Frequency Response ................................................................................................ 10
Figure 29. 192 kHz, Crosstalk ................................................................................................................... 10
Figure 30. 192 kHz, Impulse Response .................................................................................................... 10
Figure 31. System Block Diagram and Signal Flow .................................................................................. 12
Figure 32. CS4352 .................................................................................................................................... 13
Figure 33. Analog Outputs ........................................................................................................................ 14
Figure 34. PCM Input Headers ................................................................................................................. 15
Figure 35. CS8416 S/PDIF Input .............................................................................................................. 16
Figure 36. Power ....................................................................................................................................... 17
Figure 37. Silkscreen Top ......................................................................................................................... 18
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DS684DB1
CDB4352
Figure 38. Top Side ................................................................................................................................... 19
Figure 39. Bottom Side ............................................................................................................................. 20
LIST OF TABLES
Table 1. System Connections .................................................................................................................... 5
Table 2. CDB4352 Jumper Settings .......................................................................................................... 11
DS684DB1
3
CDB4352
1. CDB4352 SYSTEM OVERVIEW
The CDB4352 evaluation board is an excellent means of quickly evaluating the CS4352. 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 a header for
system development.
The CDB4352 schematic has been partitioned into five schematics, as shown in Figures 32 through 36. Each partitioned schematic is represented in the system diagram shown in Figure 31. Notice that the system diagram also
includes the interconnections between the partitioned schematics.
2. CS4352 DIGITAL-to-ANALOG CONVERTER
A description of the CS4352 is included in the CS4352 datasheet.
3. CS8416 DIGITAL AUDIO RECEIVER
The system receives and decodes the standard S/PDIF data format using a CS8416 Digital Audio Receiver,
Figure 35. The outputs of the CS8416 include a serial bit clock, serial data, left-right clock, and a 128/256 Fs master
clock. The CS8416 data format is fixed to I²S. The operation of the CS8416 and a discussion of the digital audio
interface is included in the CS8416 datasheet.
The evaluation board has been designed such that the input can be either optical or coaxial, see Figure 35. However, both inputs cannot be driven simultaneously.
Position 2 of S1 sets the output MCLK to LRCK ratio of the CS8416. This switch should be set to 256 (LO) for input
Fs<=48 kHz and can be either 256 (LO) or 128 (HI) for Fs>48 kHz
4. INPUT FOR CLOCKS AND DATA
The evaluation board has been designed to allow interfacing to external systems via the header J13. Header J13
allows the evaluation board to accept externally generated PCM clocks and data. The schematic for the clock/data
input is shown in Figure 34. Switch position 1 of S1 selects the source as either CS8416 or header J13.
Please see the CS4352 datasheet for more information.
5. POWER SUPPLY CIRCUITRY
Power is supplied to the evaluation board by three binding posts (GND, VL, and VA_H), see Figure 36. The VL supply can be jumpered to a +3.3 V regulator or provided externally through the VL binding post. VD and VA is normally
supplied by the 3.3 V regulator but can be disconnected using J4 and J6 and then have external voltage applied to
the VD and VA test points. The +5 V supply (which powers the regulators for this board) is normally supplied by a
5 V regulator but can be supplied externally by removing J7 and applying 5 V to TP8.
Power consumption of the CS4352 can be measured through the voltage drop at J8, J9, J10, and J11 when the
shunts are removed.
WARNING: Refer to the CS4352 datasheet for maximum allowable voltages levels. Operation outside of this range
can cause permanent damage to the device.
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DS684DB1
CDB4352
6. GROUNDING AND POWER SUPPLY DECOUPLING
As with any high-performance converter, the CS4352 requires careful attention to power supply and grounding arrangements to optimize performance. Figure 32 details the connections to the CS4352 and Figures 37, 38, and 39
show the component placement and top and bottom layout. The decoupling capacitors are located as close to the
CS4352 as possible. Extensive use of ground plane fill in the evaluation board yields large reductions in radiated
noise.
7. HARDWARE CONTROL
The CDB4352 is controlled through settings on switch S1. This allows for configuration of the board without a PC.
A switch is provided for CS8416 MCLK speed, clock and data source for the board, and the hardware mode configuration of the CS4352.
8. ANALOG OUTPUT FILTERING
The analog output on the CDB4352 has been designed according to the CS4352 datasheet. This output circuit includes an AC coupling cap, the BJT mute circuit, and a single-pole R and C.
CONNECTOR
INPUT/OUTPUT
VL
Input
+ 1.5 V to +3.3 V power for the CS4352 serial interface
VA_H
Input
+9 V to +12 V positive supply for the CS4352 high-voltage analog and
the CDB4352 regulators
GND
Input
Ground connection from power supply
SPDIF INPUT - J16
Input
Digital audio interface input via coaxial cable
SPDIF INPUT - OPT1
Input
Digital audio interface input via optical cable
PCM INPUT - J13
Input
AOUTA and AOUTB
Output
SIGNAL PRESENT
Input for master, serial, left/right clocks and serial data
RCA line-level analog outputs
Table 1. System Connections
DS684DB1
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CDB4352
9. PERFORMANCE PLOTS
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
-50
d
B
r
-60
A
-50
-60
-70
d
B
r
-80
A
-80
-70
-90
-90
-100
-100
-110
-110
-120
-120
-130
-140
20
-130
50
100
200
500
1k
2k
5k
10k
-140
20
20k
50
100
200
Hz
+0
+0
-10
-20
-20
-30
-30
-40
-40
-60
-70
d
B
r
-80
A
-80
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
50
100
200
500
1k
2k
5k
10k
20k
20k
40k
Figure 3. FFT (48 kHz, No Input)
60k
80k
100k
120k
Figure 4. FFT (48 kHz Out-of-Band, No Input)
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
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
Hz
Figure 5. 48 kHz, THD+N vs. Input Freq
6
20k
Hz
Hz
d
B
r
10k
-70
-90
-140
20
5k
-50
-50
A
2k
Figure 2. FFT (48 kHz, -60 dB)
-10
-60
1k
Hz
Figure 1. FFT (48 kHz, 0 dB)
d
B
r
500
20k
-110
-120
-100
-80
-60
-40
-20
+0
dBFS
Figure 6. 48 kHz, THD+N vs. Level
DS684DB1
CDB4352
+40
+5
+35
+4
+30
+25
+3
+20
+2
+15
+10
+1
d
B
r
+5
A
-5
d
B
r
+0
A
-10
-15
+0
-1
-2
-20
-3
-25
-30
-4
-35
-40
-140
-120
-100
-80
-60
-40
-20
-5
20
+0
50
100
200
dBFS
500
1k
2k
5k
10k
20k
Hz
Figure 7. 48 kHz, Fade-to-Noise Linearity
Figure 8. 48 kHz, Frequency Response
+0
3
-10
2.5
-20
2
-30
1.5
-40
1
-50
500m
-60
d
B
V
-70
-80
0
-500m
-90
-1
-100
-1.5
-110
-2
-120
-2.5
-130
-140
20
50
100
200
500
1k
2k
5k
10k
-3
0
20k
500u
1m
Figure 9. 48 kHz, Crosstalk
+0
+0
-10
-20
-20
-30
-30
-40
-40
-60
-70
d
B
r
-80
A
-80
A
-90
-100
-100
-110
-110
-120
-120
-130
-130
50
100
200
500
1k
2k
Hz
Figure 11. FFT (96 kHz, 0 dB)
DS684DB1
3m
-70
-90
-140
20
2.5m
-50
-50
-60
2m
Figure 10. 48 kHz, Impulse Response
-10
d
B
r
1.5m
sec
Hz
5k
10k
20k
-140
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 12. FFT (96 kHz, -60 dB)
7
CDB4352
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
-50
-50
-60
-70
d
B
r
-80
A
-80
d
B
r
-60
A
-70
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
20
-140
50
100
200
500
1k
2k
5k
10k
20k
20k
40k
60k
Figure 13. FFT (96 kHz, No Input)
100k
120k
Figure 14. FFT (96 kHz Out-of-Band, No Input)
+0
+0
-10
-10
-20
-20
-30
-30
-40
d
B
r
80k
Hz
Hz
-40
d
B
r
-50
-60
-50
-60
A
A
-70
-70
-80
-80
-90
-90
-100
-100
-110
20
50
100
200
500
1k
2k
5k
10k
-110
-120
20k
-100
-80
-60
-40
-20
+0
dBFS
Hz
Figure 15. 96 kHz, THD+N vs. Input Freq
Figure 16. 96 kHz, THD+N vs. Level
+5
+40
+35
+4
+30
+25
+3
+20
+2
+15
+10
+1
d
B
r
+5
+0
d
B
r
A
-5
A
-10
-15
+0
-1
-2
-20
-3
-25
-30
-4
-35
-40
-140
-120
-100
-80
-60
-40
-20
dBFS
Figure 17. 96 kHz, Fade-to-Noise Linearity
8
+0
-5
20
50
100
200
500
1k
2k
5k
10k
20k
Hz
Figure 18. 96 kHz, Frequency Response
DS684DB1
CDB4352
+0
3
-10
2.5
-20
2
-30
1.5
-40
1
-50
500m
-60
d
B
V
-70
-80
0
-500m
-90
-1
-100
-1.5
-110
-2
-120
-2.5
-130
-140
20
50
100
200
500
1k
2k
5k
10k
-3
0
20k
250u
500u
Figure 19. 96 kHz, Crosstalk
+0
+0
-10
-20
-20
-30
-30
-40
-40
-60
-70
d
B
r
-80
A
-80
A
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
20
50
100
200
500
1k
2k
5k
10k
-140
20
20k
50
100
200
Figure 21. FFT (192 kHz, 0 dB)
1k
2k
5k
10k
20k
Figure 22. FFT (192 kHz, -60 dB)
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
-50
-50
-60
-70
d
B
r
-80
A
-80
A
500
Hz
Hz
-60
1.5m
-70
-90
d
B
r
1.25m
-50
-50
-60
1m
Figure 20. 96 kHz, Impulse Response
-10
d
B
r
750u
sec
Hz
-70
-90
-90
-100
-100
-110
-110
-120
-120
-130
-130
-140
-140
20
50
100
200
500
1k
2k
5k
Hz
Figure 23. FFT (192 kHz, No Input)
DS684DB1
10k
20k
20k
40k
60k
80k
100k
120k
Hz
Figure 24. FFT (192 kHz Out-of-Band, No Input)
9
CDB4352
+0
+0
-10
-10
-20
-20
-30
-30
-40
-40
d
B
r
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
-110
-120
20k
-100
-80
-60
-40
-20
+0
dBFS
Hz
Figure 25. 192 kHz, THD+N vs. Input Freq
Figure 26. 192 kHz, THD+N vs. Level
+5
+40
+35
+4
+30
+25
+3
+20
+2
+15
+10
+1
d
B
r
+5
+0
d
B
r
A
-5
A
+0
-1
-10
-15
-2
-20
-3
-25
-30
-4
-35
-40
-140
-120
-100
-80
-60
-40
-20
-5
20
+0
50
100
dBFS
200
500
1k
2k
5k
10k
20k
Hz
Figure 27. 192 kHz, Fade-to-Noise Linearity
Figure 28. 192 kHz, Frequency Response
+0
3
-10
2.5
-20
2
-30
1.5
-40
1
-50
500m
-60
d
B
V
-70
-80
0
-500m
-90
-1
-100
-1.5
-110
-2
-120
-2.5
-130
-140
20
50
100
200
500
1k
2k
Hz
Figure 29. 192 kHz, Crosstalk
10
5k
10k
20k
-3
0
200u
400u
600u
sec
Figure 30. 192 kHz, Impulse Response
DS684DB1
CDB4352
JUMPER /
SWITCH
PURPOSE
POSITION
FUNCTION SELECTED
J7
Selects source of voltage for
the +5V supplies
+5 V
*+5V_REG
Voltage source is +5 V test point (TP8)
Voltage source is +5 V regulator
J4
Selects source of voltage for
the VD supplies
VD
*+3.3V REG
Voltage source is VD test point (TP2)
Voltage source is +3.3 V regulator
J5
Selects source of voltage for
the VL supply
VL
*+3.3V REG
Voltage source is VL binding post
Voltage source is +3.3 V regulator
J6
Selects source of voltage for
the VA supply
VA
*+3.3V REG
Voltage source is VA test point (TP7)
Voltage source is +3.3 V regulator
J8
Current measure for VD
*shunted
When shunt is removed, the voltage can be measured
across a fixed resistance to determine current.
J9
Current measure for VL
*shunted
When shunt is removed, the voltage can be measured
across a fixed resistance to determine current.
J10
Current measure for VA
*shunted
When shunt is removed, the voltage can be measured
across a fixed resistance to determine current.
J11
Current measure for VA_H
*shunted
When shunt is removed, the voltage can be measured
across a fixed resistance to determine current.
S1
Sets clock source, CS8416
clock speed, and CS4352 settings
*1 = open
*2, 3, 4, 5 = closed
position 1: 0 = external clock source, 1 = CS8416
position 2: 0 = 8416 MCLK is 256xFs, 1 = 128xFs
Position 3,4,5: see CS4352 datasheet
S2
Reset
-
Enables reset for CS4352 and CS8416 when pressed
Mute Disable
*LED
MUTE
Bypasses muting to turn on LED
Normal muting circuit
J12
J17
Table 2. CDB4352 Jumper Settings
*Default Factory Settings.
10.DESIGN NOTE
10.1
CDB4352 Revision A.0
D2 has been removed and shorted and R2 has been removed.
The serial audio decode table for S1 is incorrect. ‘01’ should be RJ-24 and ‘10’ should be LJ
The polarity of the silkscreen for Z1, Z2, Z3, Z4, and Z5 is incorrect
The CS4352 revision is A1
10.2
CDB4352 Revision B.0
No errors at this time
DS684DB1
11
12
11.SCHEMATICS
Hardware Switch
Figure 34
Power
Figure 36
Reset
Circuit
8416 Digital
Audio Receiver
Figure 35
MCLK
SCLK
LRCK
SDIN
CS4352
Figure 32
Channel A
Outputs and Mute
Figure 33
Channel B
Outputs and Mute
Figure 33
PCM Inputs
Figure 34
Figure 31. System Block Diagram and Signal Flow
CDB4352
DS684DB1
DS684DB1
Figure 32. CS4352
CDB4352
13
14
CDB4352
DS684DB1
Figure 33. Analog Outputs
DS684DB1
15
CDB4352
Figure 34. PCM Input Headers
16
CDB4352
DS684DB1
Figure 35. CS8416 S/PDIF Input
DS684DB1
17
CDB4352
Figure 36. Power
DS684DB1
18
CDB4352
Figure 37. Silkscreen Top
19
CDB4352
DS684DB1
Figure 38. Top Side
20
CDB4352
DS684DB1
Figure 39. Bottom Side
CDB4352
12.REVISION HISTORY
Release
DB1
DB2
Changes
Initial Release
Added Performance Plots
Contacting Cirrus Logic Support
For all product questions and inquiries, contact a Cirrus Logic Sales Representative.
To find the one nearest 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
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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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or service marks of their respective owners.
DS684DB1
21