CS5543 datasheet(10/30 Pages) CIRRUS

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CS5542 CS5543

DS109PP2

GENERAL DESCRIPTION

The CS5542 is a monolithic CMOS dual delta-sig-

ma modulator. Each modulator in the CS5542 ac-

cepts a low level current input, usually supplied by

a photodiode (see Figure 1). This current is digi-

tized by the CS5542 modulator and filtered by the

CS5543 digital FIR decimation filter. Four CS5542

modulator chips can be combined with one CS5543

filter chip to provide eight channels of data conver-

sion as shown in Figure 2. Up to 128 8-channel

blocks of CS5542/CS5543 chip sets can be con-

nected to build a 1024 channel system as shown in

Figure 3. The CS5542/CS5543 combination sup-

ports several calibration modes for the data acqui-

sition system.

THEORY OF OPERATION

The CS5542/CS5543 chip set is designed to con-

struct multi-channel current input digitizer sys-

tems. The conversion clock input (CLKIN) into

the CS5543 provides the master clock for the digi-

tal filter. This clock can be as fast as 2.048 MHz.

CLKIN is buffered inside the CS5543 and is passed

to each of the CS5542 modulator chips as the

MCLK (modulator clock) signal.

The CS5542/

CS5543 combination provides output conversion

data at a word rate equal to CLKIN/2048.

INL

REFGNDL

GNDL

ICAL

INR

REFGNDR

GNDR

VA-

VA+

VD+

DGND

MDATA [3:0]

C [2:0]

CAL [1:0]

FSYNC

MCLK

PDN

CAPSIZE

VREF+ VREF-

SEL0

SEL1

CS5542

+4.0 V

-4.0 V

µF

Photodiode

Reference

8 MEG

+5 V

-5V

25,24,21,20

28,27,26

19, 18

CS5543

Decimator

Photodiode

-4.0 V

I FS

µF

µF10 µF

µF

Ω

Differential

Reference

Voltage

µF

Note 1

Note 1: Diodes can be connected with either polarity. As shown the CS5542/43 will

generate a more negative code as the photodiode outputs more current.

2: The ICAL current can be of either polarity. Its magnitude will determine the

full scale measurement range.

Note 1

Note 2

DGND

AGND

Figure 1. CS5542 Typical Connection Diagram

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