MAX3658 データシートの表示（PDF） - Maxim Integrated

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MAX3658

622Mbps, Low-Noise, High-Gain Transimpedance Preamplifier

Maxim Integrated 

622Mbps, Low-Noise, High-Gain

Transimpedance Preamplifier

Functional Diagram

Rf

ROUT

OUT+

IN

TIA

VOLTAGE

AMPLIFIER

OUTPUT

BUFFER

ROUT

OUT-

LOWPASS

FILTER

DC CANCELLATION

EN

MON

VCC

MAX3658

RESISTIVE

FILT

NETWORK

Detailed Description

The MAX3658 transimpedance amplifier is designed for

622Mbps fiber optic applications. The MAX3658 is

comprised of a transimpedance amplifier, a voltage

amplifier, an output buffer, a DC cancellation circuit,

and a photocurrent monitor.

Transimpedance Amplifier

The signal current at the input flows into the summing

node of a high-gain amplifier. Shunt feedback through

resistor RF converts this current into a voltage. Schottky

diodes clamp the output signal for large input currents

(Figure 1).

Voltage Amplifier

The voltage amplifier provides additional gain and con-

verts the transimpedance amplifier single-ended output

into a differential signal.

AMPLITUDE

Figure 1. MAX3658 Limited Output

TIME

OUTPUT (SMALL SIGNALS)

OUTPUT (LARGE SIGNALS)

6 _______________________________________________________________________________________

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