CS5529 datasheet(18/31 Pages) CIRRUS

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CS5529

DS246F5

Gain Register

The gain register span is from 0 to (4-2-22). After Reset the (MSB-1) bit is ‘1’, all other bits are ‘0’.

The gain calibration results is stored in the gain

transfer function. The gain register spans from 0 to

(4 - 2-22). The decimal equivalent meaning of the

gain register is

where the binary numbers have a value of either

zero or one (b0 corresponds to bit MSB-1, N = 22).

Self Calibration

The CS5529 offers both self offset and self gain

calibrations. For the self-calibration of offset, the

converter internally ties the inputs of the modulator

together and routes them to the VREF- pin as

shown in Figure 6. Also self offset calibration re-

quires that VREF- be tied to a fixed voltage be-

tween VA+ and VA-. For self-calibration of gain,

the differential inputs of the modulator are connect-

ed to VREF+ and VREF- as shown in Figure7.

System Calibration

For the system calibration functions, the user must

input signals which represent system ground and

system full scale to the converter. When a system

offset calibration is performed a ground reference

signal must be applied to the converter (see Figure

8). When a system gain calibration is performed,

the user must input a signal representing the posi-

tive full scale point as shown in Figure 9. In either

case, calibration signals must be within the speci-

fied calibration limits for each specific calibration

step (refer to the System Calibration Specifica-

23(MSB)

2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

2-9

2-10

00000

9876

2-11

2-12

2-13

2-14

2-15

2-16

2-17

2-18

2-19

2-20

2-21

2-22

00000

MSB

(

–

… b

– )

MSB

–

∑

AIN+

AIN-

OPEN

CLOSED

VREF-

Figure 6. Self Calibration of Offset.

AIN+

AIN-

OPEN

CLOSED

VREF+

CLOSED

VREF-

Reference

Figure 7. Self Calibration of Gain.

External

Connections

0V +

AIN+

AIN-

Figure 8. System Calibration of Offset.

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