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MAX3761

Low-Power, 622Mbps Limiting Amplifiers with Chatter-Free Power Detect for LANs

Maxim Integrated 

19-1097; Rev 4; 8/08

EVAALVUAAILTAIOBNLEKIT

Low-Power, 622Mbps Limiting Amplifiers

with Chatter-Free Power Detect for LANs

_______________General Description

The MAX3761/MAX3762 limiting amplifiers, with 4mV

sensitivity and PECL data outputs, are optimized for

operation in low-cost, 622Mbps, LAN/ATM LAN fiber

optics applications.

An integrated power detector senses the input signal’s

amplitude. A received-signal-strength indicator (RSSI)

gives an analog indication of the power level, while the

complementary loss-of-signal (LOS) outputs indicate if

the input power level exceeds the programmed

threshold level. The LOS threshold can be adjusted to

detect signal amplitudes between 3mVp-p and

100mVp-p, providing a 15dB LOS adjustment in fiber

optic receivers. The LOS outputs have 3.5dB of

hysteresis, which prevents chatter when input signal

levels are small. The MAX3761’s LOS outputs are com-

patible with TTL-logic levels. The MAX3762 has PECL

LOS outputs.

DISABLE and LOS can be used to implement a squelch

function, which turns off the data outputs when the

input signal is below the programmed threshold.

________________________Applications

622Mbps LAN/ATM LAN Receivers

155Mbps LAN/ATM LAN Receivers

____________________________Features

♦ Chatter-Free Power Detector with Programmable

Loss-of-Signal Outputs

♦ 4mV Input Sensitivity

♦ PECL Data Outputs

♦ Single 5V Power Supply

♦ 250ps Output Edge Speed

♦ Low 15ps Pulse-Width Distortion

♦ TTL Loss-of-Signal Interface Logic—MAX3761

♦ PECL Loss-of-Signal Interface Logic—MAX3762

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX3761EEP+

-40°C to +85°C 20 QSOP

MAX3761E/D

-40°C to +85°C Dice*

MAX3762EEP+

-40°C to +85°C 20 QSOP

MAX3762E/D

-40°C to +85°C Dice*

*Dice are designed to operate from -40°C to +85°C, but are

tested and guaranteed only at TA = +25°C.

+Denotes a lead-free/RoHS-compliant package.

__________________Pin Configuration _________Typical Operating Circuits

TOP VIEW

FILTER 1

RSSI 2

EN 3

VCC 4

VIN+ 5

VIN- 6

GND 7

SUB 8

CZP 9

CZN 10

MAX3761

MAX3762

20 DISABLE

19 LOS+

18 LOS-

17 VCC

16 VCCO

15 OUT+

14 OUT-

13 GNDO

12 VTH

11 INV

QSOP

+5V

100pF

BYPASS

SUPPLY

10nF

CIN

5.6nF

CIN

5.6nF

100pF

CFILTER

+VCC

VCC

EN

RSSI

VCCO

VIN+

CZP

CZN

DISABLE

LOS+

LOS-

OUT-

OUT+

MAX3761

VIN-

GNDO

FILTER

GND

INV

VTHSUB

CAZ

150pF

50Ω

50Ω

VCC - 2V

R1

100kΩ

R2

22kΩ

MAX3762 at end of data sheet.

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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