Rainbow Electronics MAX3745 User Manual

General description, Applications, Features

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General Description

The MAX3744/MAX3745 transimpedance amplifiers pro-
vide a compact, low-power solution for communication
up to 2.7Gbps. They feature 330nA input-referred noise
at 2.1GHz bandwidth (BW) with 0.85pF input capaci-
tance. The parts also have >2mA

P-P

AC input overload.

Both parts operate from a single +3.3V supply and con-
sume 93mW. The MAX3744/MAX3745 are in a compact
30-mil x 50-mil die and require no external compensa-
tion capacitor. A space-saving filter connection is pro-
vided for positive bias to the photodiode through an
on-chip 580

Ω resistor to V

CC

. These features allow

easy assembly into a low-cost TO-46 or TO-56 header
with a photodiode.

The MAX3744 and MAX3748A receiver chip set pro-
vides an RSSI output using a Maxim-proprietary* inter-
face technique. The MAX3744 preamplifier, MAX3748A
postamplifier, and DS1858/DS1859 SFP controller meet
all the SFF-8472 digital diagnostic requirements.

Applications

Up to 2.7Gbps SFF/SFP Optical Receivers

Optimized for Small-Form-Factor Pluggable (SFP)
Optical Receivers

Features

Up to 2.7Gbps (NRZ) Data Rates
RSSI Implementation in 4-Pin TO46 Header

(MAX3744)

10ps

P-P

Deterministic Jitter for <100µA

P-P

Input

Current

330nA

RMS

Input-Referred Noise at 2.1GHz

Bandwidth

28mA Supply Current at +3.3V
2GHz Small-Signal Bandwidth
2.0mA

P-P

AC Overload

Die Size: 30 mils x 50 mils

MAX3744/MAX3745

2.7Gbps SFP Transimpedance

Amplifiers with RSSI

________________________________________________________________ Maxim Integrated Products

1

Ordering Information

V

CC

FILTER

4-PIN TO CAN

400pF

400pF

IN

OUT+

OUT-

GND

OUT+

0.1

µ

F

0.1

µ

F

3.3k

IN+

V

CC

IN-

RSSI

DISABLE

LOS

OUT-

MAX3748A

SFP OPTICAL RECEIVER

HOST
BOARD

MOD-DEF1

MOD-DEF2

4.7k

TO
10k

V

CC

MAX3744

DS1858/

DS1859

3.3V

Typical Application Circuit

19-2927; Rev 0; 7/03

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.

**Dice are guaranteed to operate from -40°C to +85°C, but are
tested only at T

A

= +25°C.

PART

TEMP RANGE

PIN-PACKAGE

MAX3744E/D

-40

°C to +85°C

Dice**

MAX3745E/D

-40

°C to +85°C

Dice**

*Patent pending

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