General Description

The MAX3825 is a quad transimpedance amplifier (TIA)

intended for 2.5Gbps system interconnect applications.

Each of the four channels converts a small photodiode

current to a measurable differential voltage with a tran-

simpedance gain of 3.7k

Ω. The circuit features

sponding to an optical input sensitivity of -22.3dBm

(BER

has 20ps of deterministic jitter and a 2.4GHz small-sig-

nal bandwidth. The MAX3825 is optimized for use with

a quad PIN photodetector array with a standard fiber

pitch of 250µm.

The MAX3825 operates from a single +3.3V supply

over a 0°C to +85°C temperature range. With a +3.3V

supply, each channel dissipates 93mW of power. A DC

cancellation circuit on each channel provides a true dif-

ferential output swing over a wide range of input cur-

rents.

Each channel has an independent supply and ground

to allow all or any combination of channels to be con-

nected. This device is available in dice only.

Features

o Single +3.3V Supply

o 93mW per Channel Power Dissipation

o 20ps Deterministic Jitter

o 2.4GHz Small-Signal Bandwidth

o No External Compensation

o 40dB Power-Supply Rejection Ratio

o Compact Die with 250µm Channel Pitch

o 100Ω Differential Output Impedance

Applications

+3.3V, 2.5Gbps Quad Transimpedance Amplifier

for System Interconnects

________________________________________________________________ Maxim Integrated Products

1

19-1855 Rev 0; 11/00

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

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

Ordering Information

Dice*

PIN-PACKAGE

TEMP. RANGE

0°C to +85°C

MAX3825U/D

PART

Typical Operating Circuit appears at end of data sheet.

*Dice are designed to operate with a 0°C to +120°C junction

Chip Topography/Pad Configuration

VCCO1 OUT1+ OUT1- VCCO1 VCCO2 OUT2+ OUT2- VCCO2 VCCO3 OUT3+ OUT3- VCCO3 VCCO4 OUT4+ OUT4-VCCO4

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

GNDO3

GNDO4

VCCI4

VCCI3

GNDI3

GNDI4

ENABLE

19

18

20

15

14

16

17

N.C.

N.C. FILTER

IN1

FILT1 IN2 FILT2 IN3 FILT3 IN4 FILT4

N.C.

N.C.

12

3

4

5

6

7

8

9

10

11

12

13

GNDO1

GNDO2

GNDF

GNDI2

VCCI2

VCCI1

GNDI1

37

38

39

40

41

42

43

44

N.C.

System Interconnects

SDH/SONET

Backplanes

Dense Digital Cross-

Connects

ATM Switching

Networks

High-Speed Parallel

Optical Links