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CS5516 Datasheet(PDF) 32 Page - Cirrus Logic

Part # CS5516
Description  16BIT/20-BIT BRIDGE TRANSDUCER A/D CONVERTER
PDF  41 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS5516 Datasheet(HTML) 32 Page - Cirrus Logic

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Introduction
The CDB5516/20 evaluation board provides a
means of testing the CS5516 and CS5520 bridge
transducer A/D converters.
The board is de-
signed to be interfaced to a PC-compatible
computer via an RS-232 port. Software is sup-
plied with the board which provides control of
all registers in the CS5516 or the CS5520.
The board is configured to be operated from +5
and -5 volt power supplies. A bridge transducer
or a bridge transducer simulator is required if the
board is to be evaluated in the ratiometric oper-
ating mode.
Evaluation Board Overview
Figure 1 illustrates the schematic of the bridge
driver and A/D converter portion of the circuit
board.
The converter operates from a 4 MHz
crystal. This results in the converter outputting
conversion words at a 50 Sps rate. The board
comes configured to be interfaced to a bridge
transducer via the 6-pin transducer terminal
block. The sense lines on the transducer termi-
nal block provide the reference voltage for the
converter.
For absolute measurements, the user can connect
either an external reference voltage (up to 3.8
volts) to the reference terminal block or connect
the on-board 2.5 volt LT1019 reference as the
voltage reference for the converter.
10k
10k
-5VA
3
5
4
6
2
7
0.1
µF
10
µF
+
+5VA
301
301
4.7nF
4.7nF
470pF
470pF
1A
1B
2A
2B
MICREL
MIC4428
EXC
EXC
U3
C20
C21
R14
R15
Q1
TP0610
R12
R11
C18
C19
LT1019-
2.5V
+5VA
5.0k
R6
7.5k
R5
7.5k
R7
50
0.1
µF
R8
C29
C14
0.1
µF
VD+
BX1
XIN
XOUT
SMODE
SOD
SID
SCLK
DGND
VD-
CS
0.1
µF
10k
23
OSCLK
24
18
17
16
15
14
13
19
VA+ MDRV+ MDRV-
1
µF
10
1
2
3
20
0.1
µF
+5VA
BX2
VA-
4
21
10
DGND
AGND
-5VA
AIN+
AGND1
AGND2
AIN-
VREF+
VREF-
6
5
8
11
100k
CS5516/20
7
9
10
12
22
100k
4.000
MHz
R13
C7
C9
R1
R17
R16
C8
SMODE
SOD
SID
SCLK
RST
CS
DRDY
DRDY
RST
J1
0.1
µF
C11
0.1
µF
C10
SIG+
SIG-
SENSE+
SENSE-
EXC+
EXC-
P1
4.7nF C15
REF+
REF-
301
301
P2
R4
R3
To
Figure 2
R2
EXC
GND
C16
C17
U5
Figure 1. Bridge Driver and A/D Converter
CDB5516/CDB5520
32
DS74DB3
32
DS74DB4



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