TL032ACD datasheet(49/68 Pages) TI

49 / 68 page

TL03x, TL03xA

ENHANCED-JFET LOW-POWER LOW-OFFSET

OPERATIONAL AMPLIFIERS

SLOS180C – FEBRUARY 1997 – REVISED DECEMBER 2001

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

APPLICATION INFORMATION

instrumentation amplifier with linear gain adjust

The low offset voltage and low power consumption of the TL03x provide an accurate but inexpensive

instrumentation amplifier (see Figure 70). This particular configuration offers the advantage that the gain can

be linearly set by one resistor:

VO =

× (VB – VA)

Adjusting R6 varies the gain. The value of R6 always should be greater than, or equal to, the value of R5 to

ensure stability. The disadvantage of this instrumentation amplifier topology is the high degree of CMRR

degradation resulting from mismatches between R1, R2, R3, and R4. For this reason, these four resistors

should be 0.1%-tolerance resistors.

–

U1C

–

U1A

1 M

Ω

VCC+

–

U1B

10 k

Ω

0.1%

10 k

Ω

0.1%

100 k

Ω

100 k

Ω

10 k

Ω

0.1%

10 k

Ω

0.1%

U1D

VCC–

NOTE A: U1A through U1D = TL03x; VCC

± = ±15 V

Figure 70. Instrumentation Amplifier With Linear Gain-Adjust Circuit

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