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LT1996

1996f

Table 3. Configuring the M Pins for Simple Inverting Gains

M81, M27, M9 Connection

Gain

M81

M27

–0.083

Output

Drive

–0.110

Output

Float

Drive

–0.297

Output

Drive

Output

–0.321

Float

Output

Drive

–0.329

Output

Drive

Float

–0.439

Output

Drive

–2.19

Drive

Output

–2.7

Float

Drive

Output

–2.89

Drive

Output

Float

–3.21

Drive

Output

Drive

–8.1

Drive

Float

Output

–9

Float

Drive

–10.8

Drive

Output

–27

Float

Drive

Float

–36

Float

Drive

–81

Drive

Float

–90

Drive

Float

Drive

–108

Drive

Float

–117

Drive

Inverting Configuration

The inverting amplifier, shown in Figure 8, is another

classical op amp configuration. The circuit is actually

identical to the noninverting amplifier of Figure 4, except

that VIN and GND have been swapped. The list of available

gains is shown in Table 3, and some of the circuits are

shown in Figure 9. Noise gain is 1+|Gain|, as is the usual

case for inverting amplifiers. Again, for the best DC perfor-

mance, match the source impedance seen by the op amp

inputs.

4pF

–

VIN

(DRIVE)

VOUT

VOUT = GAIN • VIN

GAIN = – RF/RG

–

1996 F08

450k

LT1996

CLASSICAL INVERTING OP AMP CONFIGURATION.

YOU PROVIDE THE RESISTORS.

CLASSICAL INVERTING OP AMP CONFIGURATION IMPLEMENTED

WITH LT1991. RF = 45k, RG = 5.55k, GAIN = –8.1.

GAIN IS ACHIEVED BY GROUNDING, FLOATING OR FEEDING BACK

THE AVAILABLE RESISTORS TO ARRIVE AT DESIRED RF AND RG.

WE PROVIDE YOU WITH <0.1% RESISTORS.

450k/81

450k/27

450k/9

450k/81

450k/27

450k/9

4pF

Figure 8. The LT1996 as a Classical Inverting Op Amp. Note the

Circuit Is Identical to the Noninverting Amplifier, Except that VIN

and Ground Have Been Swapped

APPLICATIO S I FOR ATIO

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