CS3001

CS3002

DS490F9

13

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.

C S 3001

R1

10 0

R2

64.9 k

C1

0.0 1 5

μ F

D ext e r R e s ear c h

The r m opile 1 M

T h e r m opile A m plifie r w ith a G a in of 650 V /V

Figure 19. Thermopile Amplifier with a Gain of 650 V/V

+5 V

VA

1 m V /V

-

+

350 Ω

+

-

-

+

x76 8

140 kΩ

365

Ω

140 k

Ω

100

Ω

100

Ω

0.2 2

μ F

0.2 2

μ F

0.0 4 7

μ F

0.1

μ F

VR EF

AIN +

AIN 1

V-

V+

CS

SD O

SCL K

C S 551 0/1 2

μ

+5 V

+ 5 V

C oun te r /T im e r

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 20. Load Cell Bridge Amplifier and A/D Converter