User Manual

CDB4351

4 DS566DB3

5. GROUNDING AND POWER SUPPLY DECOUPLING

As with any high-performance converter, the CS4351 requires careful attention to power supply

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

CS4351 and Figures 8, 9, and 10 show the component placement and top and bottom layout.

The decoupling capacitors are located as close to the CS4351 as possible. Extensive use of

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

6. CONTROL PORT SOFTWARE

The CDB4351 is shipped with Windows 95/98/ME-based software as well as Windows

NT/2000/XP drivers for interfacing with the CS4351 control port via the DB25 connector, J16.

The software can be used to communicate with the CS4351 in either SPI or I

C mode. See the

readme.txt file for more information.

7. ANALOG OUTPUT FILTERING

The analog output on the CDB4351 has been designed according to the CS4351 datasheet. This

output circuit includes an AC coupling cap, the FET mute circuit, and a single-pole R and C. An

additional load resistance of 5.1 kΩ can be jumpered in (J15 and J24) to test the CS4351’s load

driving capability. The FET muting circuit may be bypassed by placing a shunt on J13 and J21.

Table 1. System Connections

CONNECTOR INPUT/OUTPUT SIGNAL PRESENT

+5V Input + 5 V power

VD Input + 3.3 V power for the CS4351 digital supply

VL Input + 1.8 V to +3.3 V power for the CS4351 serial interface

VA Input + 3.3 V power for the CS4351 low-voltage analog

VA_H Input +9 V to +12 V positive supply for the CS4351 high-voltage analog

GND Input Ground connection from power supply

SPDIF INPUT - J11 Input Digital audio interface input via coaxial cable

SPDIF INPUT - OPT1 Input Digital audio interface input via optical cable

PCM INPUT - J9 Input Input for master, serial, left/right clocks and serial data

PC Port Input/Output

Parallel connection to PC for SPI / I

C control port signals

EXT CTRL I/O Input/Output

I/O for SPI / I

C control port signals

AOUTA and AOUTB Output RCA line-level analog outputs