CDB4344 datasheet(4/14 Pages) CIRRUS | Evaluation Board for CS4344

4 page

CDB4344

DS613DB2

5. GROUNDING AND POWER SUPPLY DECOUPLING

As with any high performance converter, the CS4344 requires careful attention to power supply

and grounding arrangements to optimize performance. Figure 2 details the connections to the

CS4344 and Figures 6, 7, and 8 show the component placement and top and bottom layout. The

decoupling capacitors are located as close to the CS4344 as possible. Extensive use of ground

plane fill in the evaluation board yields large reductions in radiated noise.

6. ANALOG OUTPUT FILTERING

The analog output on the CDB4344 has been designed according to the CS4344 datasheet. This

output circuit includes an AC coupling cap and a single pole R and C. An additional load resis-

tance may be added by stuffing R10 and R26 to test the CS4344’s load driving capability.

Table 1. System Connections

CONNECTOR

INPUT/OUTPUT

SIGNAL PRESENT

+5V

Input

+ 5 V power

GND

Input

Ground connection from power supply

+3.3V to +5V

Input

+3.3 V to +5 V positive supply for the CS4344 VA power

S/PDIF INPUT - J5

Input

Digital audio interface input via coax

S/PDIF INPUT - OPT1

Input

Digital audio interface input via optical

PCM INPUT - J9

Input

Input for master, serial, left/right clocks and serial data

LEFT_OUT and

RIGHT_OUT

Output

RCA line level analog outputs

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