CS4328 datasheet(22/31 Pages) CIRRUS

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Power Supply Circuitry

Figure 1 shows the evaluation board power sup-

ply circuitry. Power is supplied to the evaluation

board by five binding posts. The +5 V analog

power supply inputs of the converter are derived

from + 15 V using the voltage regulators U5 and

U6. The +5 V digital supply for the converter

and the discrete logic on the board is provided

by the +5 V and DGND binding posts. D1, D2,

and D3 are transient suppressors which also pro-

vide protection from incorrectly connected

power supply leads.

C1-C8 provide general

power supply filtering for the analog supplies.

As shown in Figure 2, C20-C24 provide local-

ized decoupling for the converter VA+ and VA-

pins. Note that C22 is connected between VA-

and VA+ and not VA- and AGND. The evalu-

ation board uses both an analog and a digital

ground plane which are connected at J1. This

ground plane arrangement isolates the board’s

digital logic from the analog circuitry.

Offset Calibration & Reset Circuitry

Figure 1, shows the offset calibration circuit pro-

vided on the evaluation board. Upon power-up,

this circuit provides a pulse on the Digital to

Analog Converter’s RST pin initiating an offset

calibration cycle. Pressing and releasing S2 also

initiates an offset calibration cycle.

Serial Data Interface

Figure 1 shows that there are two options for in-

puting serial data into the CS4328. Serial data

can be provided via the SDATA BNC connector

on the evaluation board.

BNC connectors for

SCLK, the serial data input clock, and L/R, the

clock that defines the channel and delineates the

data, are also provided on the evaluation board.

This information can also be provided by the on-

board CS8412.

JP3 selects the source of

SDATA, SCLK, and L/R that will be provided to

the converter.

JP3 selections are shown in Ta-

ble 1.

0.22 uF

0.47 uF

+ C3

47 uF

0.22 uF

OUT

COM

78L05

0.47 uF

+ C1

47 uF

0.1 uF

+15V

-15V

+5V

79L05

COM

OUT

DGND

AGND

VA+

VA-

VD+

D1 = P6KE-6V8P from Thomson

D2 = D3 = 1N6276A 1.5KE

AGND

DGND

VD+

10k

Ω

C15

0.1uF

D13

1N148

CAL

U7B

74HC14

U7C

RST

CS4328

Figure 1. Power Supply and Reset Circuitry

CDB4328

DS62DB2

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