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CS5542-KL

22-Bit, Multi-Channel ∆Σ ADC Chip Set

Cirrus Logic 

CS5542 CS5543

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.

Differential

Voltage

Reference

+4.0 V -4.0 V

.1µF

.1µF

Note 1

5

INL

3

2

VREF+ VREF-

Photodiode

6

4

REFGNDL

GNDL

Reference

-4.0 V

Note 2

8 MEG I FS 10 ICAL

IR 8 INR

CS5542

Note 1

Photodiode

7 REFGNDR

9

GNDR VA-

VA+

13

12

+5 V

10 µF

.1µF

-5V .1µF

14

15

SEL0

SEL1

CAPSIZE 1

11

PDN

17

MCLK

16

FSYNC

CAL [1:0] 19, 18

2

28,27,26

C [2:0]

3

MDATA [3:0] 25,24,21,20 4

VD+ DGND

23

22

10Ω

.1µF

10 µF

AGND

DGND

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.

Figure 1. CS5542 Typical Connection Diagram

10

To

CS5543

Decimator

DS109PP2

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