CDB4352 Datasheet, PDF (5/21 Pages) Cirrus Logic – Evaluation Board for CS4352

CDB4352
6. GROUNDING AND POWER SUPPLY DECOUPLING
As with any high-performance converter, the CS4352 requires careful attention to power supply and grounding ar-
rangements 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 config-
uration of the CS4352.
8. ANALOG OUTPUT FILTERING
The analog output on the CDB4352 has been designed according to the CS4352 datasheet. This output circuit in-
cludes an AC coupling cap, the BJT mute circuit, and a single-pole R and C.
CONNECTOR
VL
VA_H
GND
SPDIF INPUT - J16
SPDIF INPUT - OPT1
PCM INPUT - J13
AOUTA and AOUTB
INPUT/OUTPUT
Input
Input
Input
Input
Input
Input
Output
SIGNAL PRESENT
+ 1.5 V to +3.3 V power for the CS4352 serial interface
+9 V to +12 V positive supply for the CS4352 high-voltage analog and
the CDB4352 regulators
Ground connection from power supply
Digital audio interface input via coaxial cable
Digital audio interface input via optical cable
Input for master, serial, left/right clocks and serial data
RCA line-level analog outputs
Table 1. System Connections
DS684DB1
5