LT1204CSW datasheet(17/20 Pages) LINER

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LT1204

APPLICATI

TYPICAL

by 1, 0.5, 0.25 and 0.125 to form an amplifier with a gain

of 16, 8, 4, 2, when LT1204 #1 is selected. LT1204 #2

is connected to the same attenuator. When enabled

(LT1204 #1 disabled), it results in gain of 1, 0.5, 0.25 and

0.125. The wide input common mode range of the

LT1204 is needed to accept inputs of 8VP-P.

4-Input Differential Receiver

LT1204s can be connected inverting and noninverting as

shown to make a 4-input differential receiver. The receiver

can be used to convert differential signals sent over a low

cost twisted pair to a single-ended output or used in video

loop-thru connections. The logic inputs A0 and A1 are tied

together because the same channels are selected on each

LT1204. By using the Disable feature, the number of

differential inputs can be increased by adding pairs of

LT1204s and tying the outputs of the noninverting LT1204s

(#1) together. Switching transients are reduced in this

receiver because the transient from LT1204 #2 subtracted

from the transient of LT1204 #1.

Programable Gain Amplifier (PGA)

Two LT1204s and seven resistors make a Programable

Gain Amplifier with a 128-to-1 gain range. The gain is

proportional to 2N where N is the 3-bit binary value of the

select logic. An input attenuator alters the input signal

4-Input Differential Receiver

–

LT1204

1.5k

100

Ω

LT1204

1.5k

124

Ω

124

Ω

249

Ω

499

Ω

VIN = 62.5mVP-P TO 8VP-P

VOUT = 1VP-P

1204 TA03

Programable Gain Amplifier Accepts Inputs

from 62.5mVP-P to 8VP-P

IN 1

IN 2

IN 3

IN 4

–IN 1

–IN 2

–IN 3

–IN 4

Ω

SHDN

Ω

1k*

TWISTED PAIR

CABLE

1k*

1204 TA04

*OPTIONAL

Ω

VOUT

–

LT1204

SHDN

–

LT1204

SHDN

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