Cirrus Logic CS3002 - Manual (Page 12)

CS3002
12 DS490F10
3.3 Applications
The CS3002 amplifiers are optimum for applications
that require high gain and low drift.
Figure 17 illustrates
a thermopile amplifier with a gain of 650V/V. The
thermopile outputs only a few millivolts when subjected
to infrared radiation. The amplifier is compensated and
bandlimited by capacitor C2 in combination with resistor
R2.
Figure 18, on page 12 illustrates a load cell bridge
amplifier with a gain of 768V/V. The load cell is excited
with +5V and has a 1mV/V sensitivity. Its full scale
output signal is amplified to produce a fully differential
3.8V into the CS5510/12 A/D converter. This circuit
operates from +5V.
CS3002
R1
100
R2
64.9k
C2
0.015 F
Figure 17. Thermopile Amplifier with a Gain of 650V/V
+5 V
VA
1 mV/V
-
+
350 
+
-
-
+
x768
140 k
365 
140 k 
100 
100 
0.22 F
0.22 F
0.047 F
0.1 F
VREF
AIN+
AIN1
V-
V+
CS
SDO
SCLK
CS5510/12
C
+5 V +5 V
Counter/Timer
SCLK = 10 kHz to 100
(32.768
SCLK = 10 kHz to 100 kHz
(32.768 nominal)
CS3002
CS3002
Figure 18. Load Cell Bridge Amplifier and A/D Converter