CS3012 datasheet(14/18 Pages) CIRRUS

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CS3011

CS3012

DS597F6

3.4

Applications

The CS3011 and CS3012 amplifiers are optimum

for applications that require high gain and low drift.

Figure 18 illustrates a thermopile amp lifier 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 19 on page 14 illustrates a load cell bridg e

amplifier with again of 768 V/V. The load cell is ex-

cited with +5 V andhas a 1 mV/V sensitivity. Its full

scale output signal is am plified to produce a f ully

differential ± 3.8 V into the CS5510/12 A/D convert-

er. This circuit operates from +5 V.

CS3011

100

64.9k

0.015μF

Dexter Research

Thermopile ST60

Figure 18. Thermopile Amplifier with a Gain of 650 V/V

+5 V

1 m V /V

350 Ω

x76 8

140 kΩ

365 Ω

140 kΩ

100 Ω

0.2 2 μ F

0.0 47 μ F

0.1 μ F

VR EF

AIN +

AIN 1

V-

V+

SD O

SCL K

C S 551 0/1 2

+5 V

C oun ter/T im er

S C L K = 1 0 k H z to 1 0 0

(3 2 .7 6 8

)

S C L K = 10 kH z t o 10 0 kH z

( 3 2. 768 n o m i n a l

)

Figure 19. Load Cell Bridge Amplifier and A/D Converter

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