CS3001_09 Datasheet, PDF (13/16 Pages) Cirrus Logic – Precision Low-voltage Amplifier; DC to 2 kHz

CS3001
CS3002
3.4 Applications
The CS3001 and CS3002 amplifiers are optimum
for applications that require high gain and low drift.
Figure 19 illustrates a thermopile amplifier with a
gain of 650 V/V. The thermopile outputs only a few
millivolts when subjected to infrared radiation. The
amplifier is compensated and bandlimited by C1 in
combination with R2.
Figure 20, on page 13 illustrates a load cell bridge
amplifier with a gain of 768 V/V. The load cell is
excited with +5 V and has a 1 mV/V sensitivity. Its
full scale output signal is amplified to produce a
fully differential ± 3.8 V into the CS5510/12 A/D
converter. This circuit operates from +5 V.
D exter R esearch
Therm opile 1M
CS3001
R2
6 4 .9 k
R1
100
C1
0.015μ F
Figure 19. Thermopile Amplifier with a Gain of 650 V/V
T h erm o p ile A m p lifie r w ith a G a in o f 6 5 0 V /V
+5 V
VA
1 m V /V
-
350 Ω
+5 V
0.1 μ F
V+
x768
+
-
1 4 0 kΩ
100 Ω
0.2 2 μ F
VREF
CS
A IN +
SDO
SCLK
C S 551 0/1 2
+
365 Ω
0.0 47 μ F
+5 V
μ
1 4 0 kΩ
-
+
0.2 2 μ F
100 Ω
A IN 1
V-
C o u n te r/T im e r
S C LK = 1 0 kH z to 10 0
(32 .76 8
S C L K = 1 0 k H)z t o 1 0 0 k H z
(3 2 .7 6 8 n o m in a l)
Figure 20. Load Cell Bridge Amplifier and A/D Converter
DS490F9
13