General Description

sensitivity and PECL data outputs, is ideal for low-cost

ATM, FDDI, and Fast Ethernet fiber optic applications.

The MAX3964 features an integrated power detector that

senses the input-signal power. It provides a received-sig-

nal-strength indicator (RSSI), which is an analog indica-

tion of the power level and complementary PECL loss-of-

signal (LOS) outputs, which indicate when the power

level drops below a programmable threshold. The

threshold can be adjusted to detect signal amplitudes as

low as 2.7mVp-p. An optional squelch function disables

switching of the data outputs by holding them at a known

state during an LOS condition.

The MAX3965 provides the same functionality, but

offers TTL-compatible LOS outputs. The MAX3968 pro-

vides the same functionality as the MAX3964, but has

data-output edge speed suitable for ESCON and

266Mbps fibre channel applications.

The MAX3964/MAX3965/MAX3968 are available in die

form, as tested wafers, and in 20-pin QSOP packages.

The MAX3964ETP is available in a 20-pin thin QFN

package.

Applications

125Mbps FDDI Receivers

155Mbps LAN ATM Receivers

Fast Ethernet Receivers

ESCON Receivers

155Mbps FTTx Receivers

Features

♦ Single Supply: +3.0V to +5.5V

♦ 1.2ns Output Edge Speed

♦ Loss-of-Signal Detector with Programmable

Threshold

♦ Analog Received-Signal-Strength Indicator

♦ Output Squelch Function

♦ Choice of TTL or PECL LOS Outputs

♦ Compatible with 4B/5B Data Coding

+3.0V to +5.5V, 125Mbps to 266Mbps

Limiting Amplifiers with Loss-of-Signal Detector

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

MAX3964

MAX3965

MAX3968

CZN

CZP

RSSI

LOS+

27nF

LOS TERMINATIONS

ARE USED ONLY

FOR THE MAX3964

AND MAX3968

FILTER

OUT-

GND

FILTER

10nF

10nF

10nF

10nF

OUT+

155Mbps

TIA

IN

IN-

IN+

GNDO

LOS-

OUT-

OUT+

SUB*

GND

R2

R1

≥100k

(MAX3965 ONLY)

INV

50

Ω

50

Ω

50

Ω

50

*PIN NOT AVAILABLE ON MAX3964ETP.

Ω

SQUELCH

PHOTODIODE

Typical Operating Circuit

19-1314; Rev 1; 10/02

Pin Configurations appear at end of data sheet.

Selector Guide appears at end of data sheet.

*Dice and wafers are designed to operate over a 0°C to +100°C

junction temperature (Tj) range, but are tested and guaranteed

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-PACKAGE

MAX3964CEP

0

20 QSOP

MAX3964C/D

0

Dice*

MAX3964C/DW

0

Wafers*

MAX3964ETP

-40

20 Thin QFN

MAX3965CEP

0

20 QSOP

MAX3965C/D

0

Dice*

MAX3965C/DW

0

Wafers*

MAX3968CEP

0

20 QSOP

MAX3968C/D

0

Dice*

MAX3968C/DW

0

Wafers*

EVALUATION

KIT

AVAILABLE