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CS3011

Precision Low-voltage Amplifier; DC to 1 kHz

Cirrus Logic 

CS3011

CS3012

3.4 Applications

The CS3011 and CS3012 amplifiers are optimum

for applications that require high gain and low drift.

Figure 18 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 19 on page 14 illustrates a load cell bridge

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

cited 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 convert-

er. This circuit operates from +5 V.

A similar circuit operating from +3 V can be

constructed using the CS5540/CS5541 A/D con-

verters.

Dexter Research

Thermopile ST60

CS3011

R2

64.9k

+5 V

VA

1 m V /V

-

350 Ω

R1

C1

100

0.015µF

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

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

14

DS597F5

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