EL2142C 데이터 시트보기 (PDF) - Elantec -> Intersil

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EL2142C

Differential Line Receiver

Elantec -> Intersil 

Applications Information

EL2142C

Differential Line Receiver

2142-8

Gain Equation

VOUT e ((R2aR1) R1) c (VIN-VINBaVREF) when R1 tied to GND

VOUT e ((R2aR1) R1) c (VIN-VINB) when R1 tied to VREF

Choice of Feedback Resistor

For a gain of one VOUT may be shorted back to

VFB but 100X – 200X improves the bandwidth

For gains greater than one there is little to be

gained from choosing resistor R1 value below

200X for it would only result in increased power

dissipation and potential signal distortion Above

200X the bandwidth response will develop some

peaking (for a gain of one) but substantially

higher R1 values may be used for higher voltage

gains such as up to 1 kX at a gain of four before

peaking will develop

Capacitance Considerations

As with many high bandwidth amplifiers the

EL2142C prefers not to drive highly capacitive

loads It is best if the capacitance on VOUT is

kept below 10 pF if the user does not want gain

peaking to develop The VFB node forms a poten-

tial pole in the feedback loop so capacitance

should be minimized on this node for maximum

bandwidth

The amount of capacitance tolerated on any of

these nodes in an actual application will also be

dependent on the gain setting and the resistor

values in the feedback network

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