CS5516-AP Cirrus Logic Inc, CS5516-AP Datasheet - Page 32

• Manufacturer Part Number: CS5516-AP
• Description: A/D Converter (A-D) IC
• Manufacturer: Cirrus Logic Inc

Specifications of CS5516-AP

• Sample Rate: 60SPS
• Input Channels Per Adc: 1
• Mounting Type: Through Hole
• No. Of Channels: 2
• Power Rating: 37.5mW
• Supply Voltage Min: 4.5V
• Peak Reflow Compatible (260 C): No
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

32
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.
32
SENSE+
EXC GND
SENSE-
EXC+
EXC-
REF+
REF-
SIG+
SIG-
+5VA
P2
P1
0.1 F
C14
301
301
R4
R3
EXC
EXC
LT1019-
7.5k
7.5k
R7
R5
2.5V
7
5
5.0k
R6
4.7nF C15
U5
+5VA
-5VA
U3
3
6
C17
50
R8
MICREL
MIC4428
2
4
470pF
C20
470pF
C16
0.1 F
0.1 F
C29
+
C21
Figure 1. Bridge Driver and A/D Converter
1A
1B
2A
10 F
TP0610
301
R12
301
R11
Q1
2B
10k
R14
10k
R15
+5VA
4.7nF
4.7nF
-5VA
C18
C19
100k
R13
0.1 F
11
10
C7
6
5
8
7
9
0.1 F
C11
3
VA+ MDRV+ MDRV-
VA-
BX2
AIN+
AGND1
AGND2
AIN-
VREF+
VREF-
4
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.
1
CS5516/20
AGND
1 F
R2
10
C9
2
R1
10
DGND
SMODE
DGND
XOUT
DRDY
SCLK
20
21
SOD
VD+
RST
VD-
BX1
XIN
SID
CS
12
22
23
24
18
17
16
15
14
13
19
CDB5516/CDB5520
0.1 F
C10
4.000
0.1 F
C8
MHz
10k
R17
100k
R16
J1
OSCLK
SMODE
SOD
SID
SCLK
DRDY
CS
RST
DS74DB4
DS74DB3
Figure 2
To