LTC1992 datasheet(24/42 Pages) AD

24 / 42 page

LTC1992 Family

1992fb

PIN FUNCTIONS

–IN, +IN (Pins 1, 8): Inverting and Noninverting Inputs

of the Amplifier. For the LTC1992 part, these pins are

connected directly to the amplifier’s P-channel MOSFET

input devices. The fixed gain LTC1992-X parts have preci-

sion, on-chip gain setting resistors. The input resistors

are nominally 30k for the LTC1992-1, LTC1992-2 and

LTC1992-5 parts. The input resistors are nominally 15k

for the LTC1992-10 part.

VOCM (Pin 2): Output Common Mode Voltage Set Pin.

The voltage on this pin sets the output signal’s common

mode voltage level. The output common mode level is set

independent of the input common mode level. This is a

high impedance input and must be connected to a known

and controlled voltage. It must never be left floating.

+VS, –VS (Pins 3, 6): The +VS and –VS power supply pins

shouldbebypassedwith0.1μFcapacitorstoanadequateana-

log ground or ground plane. The bypass capacitors should

be located as closely as possible to the supply pins.

+OUT, –OUT (Pins 4, 5): The Positive and Negative

Outputs of the Amplifier. These rail-to-rail outputs are

designed to drive capacitive loads as high as 10,000pF.

VMID (Pin 7): Mid-Supply Reference. This pin is connected

to an on-chip resistive voltage divider to provide a mid-

supply reference. This provides a convenient way to set

the output common mode level at half-supply. If used for

this purpose, Pin 2 will be shorted to Pin 7, Pin 7 should

be bypassed with a 0.1μF capacitor to ground. If this refer-

ence voltage is not used, leave the pin floating.

BLOCK DIAGRAMS (1992)

–

200k

+VS

–VS

V+

V–

30k

–

+OUT

1992 BD

–IN

VMID

VOCM

+IN

–OUT

+VS

–VS

+VS

–VS

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