Cirrus-logic CS3002 Manual do Utilizador descarregar pdf (Página 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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