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General Description

The MAX3266 is a transimpedance preamplifier for

1.25Gbps LAN fiber optic receivers. The circuit features

200nA input-referred noise, 920MHz bandwidth, and

1mA input overload.

The MAX3267 provides a pin-for-pin compatible solu-

tion for communications up to 2.5Gbps. It features

500nA input-referred noise, 1.9GHz bandwidth, and

1mA input overload.

Both devices operate from a single +3.0V to +5.5V sup-

ply and require no compensation capacitor. They also

include a space-saving filter connection that provides

positive bias for the photodiode through a 1.5k

Ω resistor

or TO-56 header with a photodiode.

The 1.25Gbps MAX3266 has a typical optical dynamic

range of -24dBm to 0dBm in a shortwave (850nm)

configuration or -27dBm to -3dBm in a longwave

(1300nm) configuration. The 2.5Gbps MAX3267 has a

typical optical dynamic range of -21dBm to 0dBm in a

shortwave configuration or -24dBm to -3dBm in a long-

wave configuration.

Applications

Gigabit Ethernet

1.0Gbps to 2.5Gbps Optical Receivers

Fibre Channel

Features

o 200nA Input-Referred Noise (MAX3266)

500nA Input-Referred Noise (MAX3267)

o 920MHz Bandwidth (MAX3266)

1900MHz Bandwidth (MAX3267)

o 1mA Input Overload

o Single +3.0V to +5.5V Supply Voltage

1.25Gbps/2.5Gbps, 3V to 5.5V, Low-Noise

Transimpedance Preamplifiers for LANs

________________________________________________________________

Maxim Integrated Products

1

OUT-

GND

FILTER

1

2

8

7

GND

OUT+

N.C.

IN

SO

TOP VIEW

3

4

6

5

MAX3266

MAX3267

0.01

µF

PHOTODIODE

1.5k

GND

FILTER

IN

0.1

µF

OUT+

OUT-

0.1

µF

400pF

100

Ω

MAX3266

MAX3267

LIMITING

AMPLIFIER

Typical Application Circuit

19-4796; Rev 0; 1/99

PART

MAX3266CSA

MAX3266C/D

—

0°C to +70°C

TEMP. RANGE

PIN-PACKAGE

8 SO

Dice*

EVALUATION

KIT

AVAILABLE

*

Dice are designed to operate with junction temperatures of 0°C

Pin Configuration

Ordering Information

MAX3267CSA

MAX3267C/D

—

0°C to +70°C

8 SO

Dice*