CDB42528 Cirrus Logic Inc, CDB42528 Datasheet - Page 6

• Manufacturer Part Number: CDB42528
• Description: BOARD EVAL FOR CS42528/CS49300
• Manufacturer: Cirrus Logic Inc

Specifications of CDB42528

• Main Purpose: Audio, Audio Processing
• Embedded: Yes, DSP
• Utilized Ic / Part: CS49300, CS42528
• Primary Attributes: 8 Single-Ended Analog Inputs and Outputs, 4 S/PDIF Inputs and 2 S/PDIF Outputs
• Secondary Attributes: Parallel, RS422, RS232, UDSP Interfaces
• Product: Audio Modules
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Contains lead / RoHS non-compliant
• Other names: 598-1503

1.10
A 32-pin dual-row header provides access to the serial audio signals required to interface with a DSP (see Figure 7).
Either the CS42528 or the DSP header can be the master of the MCLK signal. The CS42528 can supply the DSP
header with its recovered master clock (RMCK), or pass the local oscillator-sourced OMCK. An optional configura-
tion supported is for the DSP header to source DSP_MCLK to the OMCK input, and the RMCK of the CS42528 is
not used.
The CS42528 SAI and CX ports are individually selectable to be master or slave, and should source/receive their
clocks to/from the DSP as required. All serial port timings must be synchronous to the to RMCK or the clock source
suppling OMCK. See the data sheet for a complete description of serial port modes of operation. All DSP header
signals are buffered, and are referenced to VLS levels. DSP interface power VLS and ground are supplied to the
header. See Table 4 for a complete description of DSP Header signals.
1.11
D1 (see Figure 16) indicates that a master reset condition has occurred on the board. D4 (see Figure 17) is sourced
from the CPLD and is currently unsupported.
1.12
Power can easily be supplied to the evaluation board through three binding posts, all referenced to the single black
binding post ground connector (see Figure 18).
Supply +18.0 VDC to the green binding post to provide the positive analog rail. Supply -18.0 VDC to the yellow bind-
ing post to provide the negative analog rail. +18V and -18V supply power to the op-amps and can be +/-12 to +/-18
volts (must be +/-18 V when filter 2 is selected).
Supply +5.0VDC to the red binding post. This directly supplies the digital +5V, is regulated down to provide the digital
+3.3V, and is filtered to supply VLC, VA and VARX.
VLS and VD must be individually set with jumpers to either +3.3V or +5V.
1.13
The CS42528 requires careful attention to power supply and grounding arrangements to optimize performance.
Figures 15 and 16 detail the routing and component placement for both top and bottom layers of the demonstration
board. Power supply decoupling capacitors are located as close to the CS42528 as possible. Extensive use of
ground plane fill in the demonstration board yields large reductions in radiated noise.
6
EXT A/D #1 LEFT/RIGHT
EXT A/D #2 LEFT/RIGHT
EXTERNAL CONTROL
CS42528 TXP - OPT3
OUT_A1 to OUT_B4
ANALOG IN LFT/RT
DSP HEADER - J36
SPDIF RX - OPT1
SPDIF TX - OPT2
HEADER - J17
SPDIF RX - J1
CONNECTOR
SPDIF TX - J2
PC Port - J22
DSP Header
LED Function Indicator
Power
Grounding and Power Supply Decoupling
+18V
GND
-18V
+5V
INPUT/OUTPUT
Input/Output
Input/Output
Input/Output
Output
Output
Output
Output
Input
Input
Input
Input
Input
Input
Input
Input
Input
Table 1. System Connections
Digital audio interface input via coax
Digital audio interface input via optical
CS8406 digital audio interface output via coax
CS8406 digital audio interface output via optical
CS42528 digital audio interface output via optical
Parallel connection to computer for SPI / I
I/O for DSP serial port signals - see signal descriptions below
+ 5VDC power
-18 to -12VDC negative supply for the op-amps
+12 to +18VDC positive supply for the op-amps
Ground connection from power supply
I/O for SPI / I
RCA phono jacks for analog input signal to CS42528 internal ADCs
RCA phono jacks for analog input signal to CS5361 ADC #1
RCA phono jacks for analog input signal to CS5361 ADC #2
RCA phono jacks for channels A1 to B4 analog outputs
2
C control port signals - see signal descriptions below
SIGNAL PRESENT
2
C control port signals
CDB42528