Cirrus-logic CS3002 Manuel d'utilisateur télécharger pdf (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

100

64.9k

0.015F

Figure 17. Thermopile Amplifier with a Gain of 650V/V

+5 V

1 mV/V

350



x768

140 k



365



140 k



100



100



0.22



0.22



0.047



0.1



VREF

IN+

IN1

V-

V+

SDO

SCLK

CS5510/12



+5 V +5 V

Counter/Timer

SCLK = 10 kHz to 100

(32.768

SCLK = 10 kHz to 100 kHz

(32.768 nominal)

CS3002

Figure 18. Load Cell Bridge Amplifier and A/D Converter

1 2 ... 7 8 9 10 11 12 13 14

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Cirrus-logic CS3002 Manuel d'utilisateur Page 12

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