CS5516-AS datasheet(36/41 Pages) CIRRUS

36 / 41 page

must be removed from between the +VREF and

-VREF pins. It may be desirable to also remove

R5, R7, C16, and C17 in some applications.

Calibrating the A/D Converter

As explained in the CS5516/CS5520 data sheet,

the order in which the calibration steps are per-

formed are important. If one chooses to use the

non-ratiometric calibration capabilities of the

converter, the non-ratiometric errors of the

VREF and AIN channels should be calibrated

first.

The non-ratiometric calibration steps can

be performed at the same time. Before the non-

ratiometric offset calibration is initiated, the

bridge should be grounded. This can be achieved

on the evaluation board by moving the two

jumpers at the output of the MIC4428 driver to

the GND position (see Figure 1). The converter

is then instructed via the configuration register

bits to perform the non-ratiometric calibration

steps. Once the non-ratiometric calibrations are

completed, ju mpers at th e output of the

MIC4428 driver should be returned to the EXC

position.

After the non-ratiometric calibration steps are

performed, the AIN ratiometric offset is then

calibrated. With "zero weight" on the load cell,

the converter is instructed via the configuration

calibration step. Finally, with "full scale weight"

on the load cell, the converter is instructed to

perform the gain calibration step.

The converter is then ready to perform conver-

sions.

Software

The evaluation board comes with software and a

RS-232 cable to interface the board to a RS-232

port of a PC-compatible computer. The software

diskette contains a README.TXT file which

explains its operation.

+5VD

0.1

µF

+5VA

0.1

µF

0.1

µF

-5VA

-5V

+5V

AGND

DGND

Figure 6. Using Off-board Voltage Reference

CDB5516/CDB5520

DS74DB3

DS74DB4

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