Grounding and power supply decoupling, Hardware control, Analog output filtering – Cirrus Logic CDB435 User Manual
Page 5: Table 1. system connections
DS684DB1
5
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.
details the connections to the CS4352 and
,
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.
Table 1. System Connections
CONNECTOR
INPUT/OUTPUT
SIGNAL PRESENT
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
Input for master, serial, left/right clocks and serial data
AOUTA and AOUTB
Output
RCA line-level analog outputs