Cirrus Logic CDB4398 User Manual

Evaluation Board for CS4398

CDB4398

Features



Demonstrates recommended layout and grounding arrangements



CS8414 receives S/PDIF, & EIAJ-340 compatible digital audio



Headers for external audio input for either PCM or DSD



Requires only a digital signal source and power supplies for a complete Digital-toAnalog-Converter system

Inputs for Clocks

and Data

Description

The CDB4398 evalua tion board is an excellent means for quickly evaluating the CS4398 24-bit, high performance stereo D/A converter. Evaluation requires an analog signal analyzer, a digital signal source, a P C for controlling the CS4398 (stand alone operation is also available) and a power supply. Analog line level ou tputs are provided via RCA phono jacks and balanced XLR.

The CS8414 digital audio receiver I.C. 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

CDB4398 Evaluation Board

Control

Port

CS8414

Digital Audio

Interface

Inputs for DSD

Data and Clock

http://www.cirrus.com

CS4398

Analog

Outputs

MUTE

JUL ‘03

DS568DB1

TABLE OF CONTENTS

1. CS4398 DIGITAL TO ANALOG CONVERTER ........................................................................3

2. CS8414 DIGITAL AUDIO RECEIVER ......................................................................................3

3. INPUT/OUTPUT FOR CLOCKS AND DATA ...........................................................................3

4. POWER SUPPLY CIRCUITRY .................................................................................................3

5. GROUNDING AND POWER SUPPLY DECOUPLING ............................................................3

6. CONTROL PORT SOFTWARE ................................................................................................4

7. DSD OPERATION .................................................................................................................... 4

8. ANALOG OUTPUT FILTERING ...............................................................................................4

9. ERRATA ...................................................................................................................................5

9. CDB4398 Revision B.0 ................... ..... ....... ..... .. .......... .. ....... ..... ....... ..... ....... .. ..... ....... ..... ....5

LIST OF FIGURES

Figure 1. System Bl o ck Dia g ra m and Signal Flow............. .......... ................... ......... ......... .......... ....6

Figure 2. CS4398 ................................................. .. ..... .. ..... ..... ....... .. ..... .. ..... ....... ..... .. ..... .. ..............7

Figure 3. CS8414 Digital Audio Receiver........................................................................................8

Figure 4. PCM and DSD Input Headers..........................................................................................9

Figure 5. Control Port Interfa ce.............. ......... .......... ......... ................... .......... ......... ......... ............10

Figure 6. Channel A Outputs and Mute.............................. .............. ....... ............ ....... ................. ..11

Figure 7. Channel B Outputs and Mute.............................. .............. ....... ............ ....... ................. ..12

Figure 8. Power Sup ply Co nne ctions......... .......... ......... .......... ................... ......... .......... ................13

Figure 9. Silkscreen Top ............ ......... ................... .......... ......... .......... ................... ......... ..............14

Figure 10. Top Sid e........ .......... ......... ......... .......... ......... ................... .......... ......... .......... ................15

Figure 11. Bot to m Si de.......... ................... .......... ......... .......... ......... ................... ......... ...................16

CDB4398

Contacting Cirrus Logic Support

For all product questions and inquiries contact a Cirrus Logic Sales Representative. To find one nearest you go to www.cirrus.com

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 sub-

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C is a regis t ered t ra demark of Phi l ips Semicon ductor . Purc has e of I2C Components of Cirr us Logi c, Inc . , or one of i t s subl i ce nsed Associated Companies

I conveys a license under the Philips I

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CDB4398

CDB4398 SYSTEM OVERVIEW

The CDB4398 evaluation board is an excellent means of quickly evaluating the CS4398. The CS8414 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 us er to supply either PCM or DSD clocks and data through headers for system development.

The CDB4398 schematic has been partitioned into 7 schematics shown in Figures 2 through 8. Each partitioned schematic is re presented in t he system diagra m shown in Figure 1. Notice that the system diagram also includes the interconnections between the partitioned schematics.

1. CS4398 DIGITAL TO ANALOG CONVERTER

A description of the CS4398 is included in the CS4398 datasheet.

2. CS8414 DIGITAL AUDIO RECEIVER

The system receives and decodes the standard S/PDIF data format using a CS8414 Digital Audio Receiver, Figure 3. The outputs of the CS8414 include a serial bit clock, serial data, left-right clock (FSYNC), and a 256 Fs master clock. The CS8414 data format is selected by switch S1. The operation of the CS8414 and a discussion of the digital audio interface is included in the CS8414 datasheet.

The evaluation board has been designed such that the input can be either optical or coax, see Figure 3. However, both inputs cannot be driven simultaneously.

3. INPUT/OUTPUT FOR CLOCKS AND DATA

The evaluation board has been designed to a llow interfacing t o external systems via th e header s, J12 and J14. Header J12 allows the eval uation board to accept externally generated PCM clocks and da ta. The schematic for the clock/data input is shown in Figure 4.

Header J14 allows the evaluation board to accept externally generated DSD data and clock. The schematic for the clock/data input is shown in Figure 4. A synchronous MCLK must still be provided via header J13. Please see the CS4398 datasheet for more information.

4. POWER SUPPLY CIRCUITRY

Power is supplied to the evaluation board by seven binding posts (GND, +5V, VLS, VLC, VD, +12V and

-12V), see Figure 8. The VLC and VLS supplies can be jumpered to the +5V binding post for ease of use. VD and VA should be set to the recommended values stated in the CS4398 datasheet. +12V and -12V supply power to the op-amps and can be +/-12 to +/-18 volts.

WARNING: Refer to the CS4398 datasheet for maximum allowable voltages levels. Operation outside of this range can cause permanent damage to the device.

5. GROUNDING AND POWER SUPPLY DECOUPLING

The CS4398 requires careful attention to power supply and grounding arrangements to optimize performance. Figure 2 details the conne ctions to the CS4398 and Figures 9, 10, and 11 show the component placement and top and bottom layout. The decoupling capacitors are located as close to the CS4398 as possible. Extensive use of ground plane fill in the evaluation board yields large reductions in radiated noise.

CDB4398

6. CONTROL PORT SOFTWARE

The CDB4398 is shipped with Windows 95/98/ME based software as well as Windows NT/2000/XP drivers for interfacing with the CS4398 control port via the DB25 connector, J21. The software can be used to communicate with the CS4398 in either SPI or I2C mode. See the readme.txt for more information.

7. DSD OPERATION

The CDB4398 supports Direct Stream Digital (DSD) operation through the header for external clocks and data, J14. The CS4398 must be configured for the DSD mode and header J11 should be set to “external”. See Table 2 for more information.

8. ANALOG OUTPUT FILTERING

The analog output on the CDB4398 has been designed to add flexibility when evaluating the CS4398. Two output filter options are offered a 2-pole butterworth 50kHz low-pass filter with single ended outputs and a 3-pole filter with XLR outputs.

The 2-pole filter (R CA) is de signed to have the in-band impedance matched between the pos itive and negative legs. It also provides a balanced to single ended conversion for standard un-balanced outputs.

The 3-pole filter (XLR) is designed to have extremely low self noise and distortion in order to evaluate the full performance of the CS4398.

CONNECTOR INPUT/OUTPUT SIGNAL PRESENT

+5V Input + 5 Volt power

VD Input + 3.3 to +5V power for the CS4398 digital supply

VLS Input + 1.8 to +5V power for the CS4398 serial interface

VLC Input + 1.8 to +5V power for the CS4398 control interface

J9 Input -18 to -12V negative supply for the op-amps

J10 Input +12 to +18V positive supply for the op-amps

GND Input Ground connection from power supply

SPDIF INPUT - J17 Input Digital audio interface input via coax

SPDIF INPUT - OPTO-1 Input Digital audio interface input via optical

PCM INPUT - J12 Input Input for master, serial, left/right clocks and serial data DSD INPUT - J14 Inpu t Input for DSD data and clock

PC Port Input/Output

EXT CTRL I/O Input/Output

OUTA and OUTB Output RCA and XLR line level analog outputs

Parallel connection to PC for SPI / I

I/O for SPI / I

C control port signals

Table 1. System Connections

CDB4398

JUMPER /

SWITCH PURPOSE POSITION S/C FUNCTION SELECTED

J3 Selects source of voltage

for the VLC supplies

J4 Selects source of voltage

for the VLS supplies

J7 Selects source of voltage

for the VD supply

J11 Clock Source Select *CS8414

S1 Sets Mode of CS8414 *M1 = open

*M0, M2, M3 = closed

J19 Stand-Alone/Control Port

Select

J20 M0/AD0/CS HI

J22 M1/SDA/CDOUT *HI

J24 M2/SCL/CCLK *HI

J28 M3/AD1/CDIN HI

CH_A CH_B

R19 and

R82

Filter select *RCA

Mute Enables *SHUNTED

VLC

*+5V

VLS

*+5V

*VD +5V

External

*CP

*LO

XLR

OPEN

Voltage source is VLC binding post

Voltage source is +5V binding post

Voltage source is VLS binding post

Voltage source is +5V binding post

Voltage source is VD binding post

Voltage source is +5V binding post

CS8414 provides PCM inputs to CS4398

PCM or DSD inputs are provided externally

Default setting is I

See CS8414 datasheet for details

S C

SC SC

C S

Stand-Alone Mode (No PC required)

Control Port Mode (PC required)

See CS4398 datasheet for details

Selects standard 2-pole filter

Selects low noise balanced outputs

Enables the external mute circuit for each

channel when 0 Ohm is present (default)

S mode

Table 2. CDB4398 Jumper Settings

*Default Factory Settings. The S/C column denotes standard jumper settings for either stand-alone (S) or control port (C) operation.

9. ERRATA CDB4398 Revision B.0

None at this time.

CDB4398

Figure 8

Power

Figure 5

Control Port

Channel A

Channel B

Outputs and Mute

Figure 2

Figure 7

DSD_CLK DSD1B

DSD1A

Figure 4

DSD Inputs

Figure 6

Outputs and Mute

CS4398

Reset

Circuit

MCLK

SCLK1

LRCK1

SDATA1

Figure 3

8414 Digital

Audio Receiver

Figure 4

PCM Inputs

Figure 1. System Block Diagram and Signal Flow

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