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CS5543 Datasheet(PDF) 10 Page - Cirrus Logic

Part # CS5543
Description  22-Bit, Multi-Channel DS ADC Chip Set
Download  30 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5543 Datasheet(HTML) 10 Page - Cirrus Logic

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CS5542 CS5543
10
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
.1
µF
Photodiode
Reference
8 MEG
+5 V
-5V
5
6
4
10
8
7
9
13
12
23
22
25,24,21,20
28,27,26
19, 18
16
17
11
1
32
14
15
2
3
4
To
CS5543
Decimator
Photodiode
-4.0 V
I FS
IR
10
µF
.1
µF
.1
µF10 µF
.1
µF
10
Differential
Reference
Voltage
.1
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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