CDB5378 datasheet(19/72 Pages) CIRRUS

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CDB5378

DS639DB3

2.2.4

Delta-Sigma Test DAC

The CS5373A

∆Σ DAC creates differential analog signals for system tests. Multiple test modes are avail-

able and their use is described in the CS5373A data sheet.

2.2.4.1

Precision Output - DAC_OUT

The CS5373A test DAC has a precision output (DAC_OUT) that is routed to the input selection jumper.

This output is sensitive to loading, and on CDB5378 should only be jumpered into the INB input which

does not have passive RC filter components installed. The input impedance of the CS3301/02 amplifiers

are high enough that the DAC precision output can be connected to the INB input directly.

2.2.4.2

Buffered Output - DAC_BUF

The CS5373A test DAC has a buffered output (DAC_BUF) that is also routed to the input selection jump-

er. This output is less sensitive to loading than the precision output, and can be jumpered into either the

INA or INB input without affecting performance. The buffered output can also drive a sensor attached to

the input screw terminals, provided the sensor meets the impedance requirements specified in the

CS5373A data sheet.

Analog Signals

Description

OUT

Precision differential analog output

BUF

Buffered differential analog output

CAP

Capacitor connection for internal anti-alias filter

VREF

Voltage reference analog inputs

Digital Signals

Description

TDATA

Delta-sigma test data input

MCLK

Clock input

MSYNC

Synchronization input

MODE[0..2]

Test mode selection

ATT[0..2]

Attenuation range selection

CDB5378 Datasheet(PDF) 19 Page - Cirrus Logic

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