MAX3866 Просмотр технического описания (PDF) - Maxim Integrated

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MAX3866

2.5Gbps, +3.3V Combined Transimpedance/Limiting Amplifier

Maxim Integrated 

2.5Gbps, +3.3V Combined

Transimpedance/Limiting Amplifier

Applications Information

Converting Average Optical Power

to Signal Amplitude

Many of the MAX3866’s specifications relate to input

signal amplitude. When working with fiber optic

receivers, the input is usually expressed in terms of

average optical power and extinction ratio. The rela-

tions given in Table 1 are helpful for converting optical

power to input signal when designing with the

MAX3866.

In an optical receiver, the input current to the transim-

pedance amplifier can be found by multiplying the

power relationships in Table 1 with the photodiode

responsivity.

Wire Bonding

Make corrections to the die with gold wire only, using

ball bonding techniques. Die pad size is 4mils (100µm)

square and die thickness is 12mils (~300µm).

Layout Techniques

The MAX3866’s performance can be greatly affected

by circuit board layout and design. Use good high-fre-

quency design techniques, including minimizing

ground inductances and using fixed-impedance trans-

mission lines on all data signals.

Table 1. Optical-Power Relations*

PARAMETER SYMBOL

RELATION

Average

Power

PAVE PAVE = (P0 + P1) / 2

Extinction

Ratio

re

re = P1 / P0

Optical Power

of a “1”

Optical Power

of a “0”

P1

P1 = 2PAVE re

re + 1

P0

P0 = 2PAVE / (re +1)

Signal

Amplitude

PIN

PIN = P1 - P0 = 2PAVE (re - 1)

(re + 1)

*Assuming a 50% average input mark density.

Pad Configuration

LOP

OUT+

GND

GND

OUT-

VCCD

VCCD

VCCS

VCCS

CHF+

CHF-

CPD+

CPD-

GND 0.066"

GND (1.68mm)

INV

PDC

FIL GND IN+ IN- GND N.C.

0.057"

(1.45mm)

TRANSISTOR COUNT: 851

_______________________________________________________________________________________ 9

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