MAX3272 Просмотр технического описания (PDF) - Maxim Integrated

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MAX3272

+3.3V, 2.5Gbps Low-Power Limiting Amplifiers

Maxim Integrated 

+3.3V, 2.5Gbps Low-Power

Limiting Amplifiers

VCC

ICC

IOUT

50Ω

50Ω

MAX3272/

MAX3272A

CML SUPPLY CURRENT (ICC)

CONTROL

RTH

SQUELCH

OPEN

LEVEL

OPEN

Figure 1. Power-Supply Current Measurement

Detailed Description

Figure 2 is a functional diagram of the MAX3272/

MAX3272A, comprising a CML input buffer, power

detector and loss-of- signal indicators, gain stage, offset-

correction loop, and CML output buffer.

CML Input Buffer

The input buffer (Figure 3) provides 100Ω input imped-

ance between IN+ and IN-. DC-coupling the inputs is

not recommended; this prevents the DC offset-correc-

tion circuitry from functioning properly.

Power Detect and

Loss-of-Signal Indicator

The MAX3272/MAX3272A are equipped with loss-of-sig-

nal (LOS) circuitry that indicates when the input signal is

below a programmable threshold, set by resistor RTH at

the TH pin (see the Typical Operating Characteristics for

appropriate resistor selection). An averaging peak-

power detector compares the input signal amplitude

with this threshold and feeds the signal-detect informa-

tion to the LOS outputs, which are internally terminated

to 8kΩ (Figure 4).

TH CLOS

MAX3272/

MAX3272A

POWER

DETECTOR

POWER DETECTOR AND

LOS INDICATOR

TTL

TTL

CONTROL

LOS

LOS

SQUELCH

IN+

CML

100Ω

INPUT

BUFFER

IN-

CML

OUTPUT

BUFFER

OUT+

OUT-

OFFSET

CORRECTION

LOWPASS

FILTER

0.1µF

LEVEL

OUTPOL

Figure 2. Functional Diagram

CAZ1

CAZ2

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