LT1990 datasheet(13/16 Pages) LINER

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LT1990

1990fb

Large Signal Transient Response

Small Signal Transient Response

TYPICAL PERFOR A CE CHARACTERISTICS

VS = ±15V

G = 1, –1

RL = 10k

VREF = GND

µs/DIV

GND

1990 G30

VS = ±15V

G = 1, –1

RL = 10k

VREF = GND

VS = 3V, 0V

G = 1, –1

RL = 10k

VREF = 1.5V

µs/DIV

GND

1.5V

1990 G28

1990 G29

–

V+

–IN

V–

+IN

REF

GAIN1

OUT

GAIN2

900k

10k

R10

10k

100k

40k

900k

1990 SS

BLOCK DIAGRA

REF (Pin 1): Reference Input. Sets the output level when

the difference between the inputs is zero.

–IN (Pin 2): Inverting Input. Connects a 1M

Ω resistor to

the op amp’s inverting input. Designed to permit high

voltage operation.

+IN (Pin 3): Noninverting Input. Connects a 1M

Ω resistor

to the op amp’s noninverting input. Designed to permit

high voltage operation.

V– (Pin 4): Negative Power Supply. Can be either ground

(in single supply applications) or a negative voltage (in

split supply applications).

GAIN2 (Pin 5): Gain = 10 Select Input. Configures the

amplifier for a gain of 10 when connected to the GAIN1 pin

and the REF pin. The gain is equal to one when both GAIN2

and GAIN1 are open. See Applications section for addi-

tional functions.

OUT (Pin 6): Output. VOUT = G • (V+IN – V–IN) + VREF, in the

basic configuration.

V+ (Pin 7): Positive Power Supply. Can range from 2.7V to

36V above the V– voltage.

GAIN1 (Pin 8): Gain = 10 Select Input. Configures the

amplifier for a gain of 10 when connected to the GAIN2 pin

and the REF pin. The gain is equal to one when both GAIN1

and GAIN2 are open. See Applications section for addi-

tional functions.

PI FU CTIO S

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