Maxim MAX3760ESA, MAX3760E-D Datasheet

General Description

The MAX3760 is a transimpedance preamplifier for 622Mbps ATM applications. It operates from a single +5V supply and typically consumes only 100mW power. The preamplifier converts a small photodiode current to a differential voltage. A DC cancellation circuit provides a true differential output swing over a wide range of input current levels, thus reducing pulsewidth distortion.

6.5kΩ transimpedance gain and 560MHz bandwidth, combined with low 73nA input-referred noise, provide

-31.5dBm typical sensitivity in 1300nm receivers. The circuit accepts a 1mAp-p input current, resulting in a typical optical overload of -3dBm. The device operates over an extended temperature range of -40°C to +85°C.

The MAX3760 is internally compensated and requires few external components. In die form it includes a space-saving filter connection, which provides positive bias for the photodiode through a 1kΩ resistor to VCC. These features, combined with the die aspect ratio and dimensioning, allow the MAX3760 to assemble easily into a TO-style header with a photodiode.

The MAX3760 is designed to be used with either the MAX3761 or the MAX3762 limiting-amplifier ICs. When combined with a photodiode, the chipset forms a complete 5V, 622Mbps receiver. The MAX3760 is available in die form and in an 8-pin SO package.

________________________Applications

622Mbps ATM LAN Optical Receivers 622Mbps WAN Optical Receivers

____________________________Features

♦ 73nA RMS Input-Referred Noise ♦ 560MHz Bandwidth ♦ 1mA Peak Input Current ♦ 6.5kΩ Gain ♦ Operation from -40°C to +85°C ♦ 100mW Typical Power Consumption ♦ Single +5V Supply

MAX3760

622Mbps, Low-Noise Transimpedance

Preamplifier for LAN and WAN Optical Receivers

________________________________________________________________

Maxim Integrated Products

MAX3760

MAX3761 MAX3762

LIMITING

AMPLIFIER

(FILTER)

OUT+

0.01µF

+5V

0.01µF

100Ω (OPTIONAL)

OUT-

GND COMP*

100pF

( ) INDICATE PINS AVAILABLE ONLY ON THE DIE. *NOT CONNECTED

INREF

Typical Application Circuit

OUT-

INREF

GND

COMP OUT+

MAX3760

TOP VIEW

Pin Configuration

19-4765; Rev 0; 7/98

PART

MAX3760ESA MAX3760E/D -40°C to +85°C

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

8 SO Dice*

EVALUATION KIT

AVAILABLE

Ordering Information

Dice are designed to operate over a -40°C to +100°C junction

temperature (T

) range, but are tested and guaranteed at

= +25°C.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800 For small orders, phone 408-737-7600 ext. 3468.

MAX3760

622Mbps, Low-Noise Transimpedance Preamplifier for LAN and WAN Optical Receivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

DC ELECTRICAL CHARACTERISTICS

(VCC= +4.5V to +5.5V, COMP = GND, 100Ω load between OUT+ and OUT-, TA= -40°C to +85°C, unless otherwise noted. Typical values are at V

= +5.0V, TA= +25°C.) (Note 1)

AC ELECTRICAL CHARACTERISTICS

(VCC= +4.5V to +5.5V, COMP = open, CIN= 0.75pF, outputs terminated differentially into 100Ω, 8-pin SO package in MAX3760 EV kit, T

= +25°C, unless otherwise noted. Typical values are at VCC= +5V.) (Notes 2, 3)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

Note 1: Dice are tested at TA= +25°C.

Note 2: AC characteristics are guaranteed by design and characterization. Note 3: C

is the source capacitance presented to the die. Includes package parasitic, photo diode, and parasitic interconnect

capacitance.

Note 4: Input is a 622Mbps 1-0 pattern, signal amplitude = 0 to 1mA, extinction ratio (r

) = 10.

Note 5: Measured with a 4-pole, 470MHz Bessel filter.

........................................................................-0.5V to +7.0V

Continuous Current

IN, FILTER..........................................................-5mA to +5mA

OUT+, OUT-...................................................-25mA to +25mA

Voltage at INREF...................................................-0.5V to +0.5V

Voltage at COMP........................................-0.5V to (V

+ 0.5V)

Continuous Power Dissipation (T

= +85°C)

SO (derate 5.88mW/°C above +85°C)..........................383mW

Storage Temperature Range.............................-65°C to +160°C

Lead Temperature (soldering, 10sec).............................+300°C

Operating Junction Temperature Range (die).....-55°C to +150°C

Processing Temperature (die).........................................+400°C

Differential output, input <10µA

Input = open

IIN= 500µA, COMP = open

IIN= 500µA, total peak-to-peak, differential signal

CONDITIONS

kΩ5.2 6.5 7.8z

Small-Signal Transimpedance

mA20 30I

V0.8 0.95V

Input Bias Voltage Supply Current

Ω800 1000 1200R

FILTER

FILTER Resistance

VVCC- 2.0Output Common-Mode Level

mV-25 25V

Differential Output Offset

Ω40 50 60Z

OUT

Output Impedance (per side)

mV550 950V

OUT(MAX)

Maximum Differential Output Voltage

UNITSMIN TYP MAXSYMBOLPARAMETER

(Note 4)

20µA average input current

CIN= 0.75pF (Notes 3, 5)

CONDITIONS

ps75 200PWDPulse-Width Distortion

kHz50

MHz455 565BWSmall-Signal Bandwidth

Low-Frequency Cutoff

73 93.5 nAi

RMS Noise Referred to Input

UNITSMIN TYP MAXSYMBOLPARAMETER

f < 1MHz, referred to output dB20 45PSRRPower-Supply Rejection Ratio

200 psDDJData-Dependent Jitter

MAX3760

622Mbps, Low-Noise Transimpedance

Preamplifier for LAN and WAN Optical Receivers

_______________________________________________________________________________________

110

-40 30 100

INPUT-REFERRED NOISE

vs. JUNCTION TEMPERATURE

100

MAX3760-01

JUNCTION TEMPERATURE (°C)

INPUT-REFERRED NOISE (nA)

-5 65

470MHz BANDWIDTH

CIN = 1.25pF

CIN = 0.25pF

CIN = 0.75pF

CIN IS SOURCE CAPACITANCE PRESENTED TO DIE. INCLUDES PACKAGE PARASITIC, PIN DIODE, AND PARASITIC INTERCONNECT CAPACITANCE

80 78

10k 100k 10M 10G

SMALL-SIGNAL GAIN

vs. FREQUENCY

62 60

72 70

MAX3760-02

FREQUENCY (Hz)

GAIN (dB)

1M 100M

100

150

200

0 400200 600 800 1000

PULSE-WIDTH DISTORTION vs.

INPUT SIGNAL AMPLITUDE

MAX3760-03

INPUT SIGNAL AMPLITUDE (µAp-p)

PWD (ps)

re = 10 622Mbps, ONE-ZERO PATTERN

100

250 200 150

350

400

300

450

1.00 10.0 21.52.15 4.64 46.4 100 215 464 1000

INPUT-REFERRED RMS NOISE CURRENT

vs. DC INPUT CURRENT

MAX3760toc04

DC INPUT CURRENT (µA)

INPUT-REFERRED NOISE (nA)

CIN = 0.75pF 470MHz BANDWIDTH

1.0

1.3

1.2

1.1

1.4

1.5

1.6

10 15010020 50 200 250 300 400 500 600

TYPICAL EYEWIDTH vs. INPUT SIGNAL

MAX3760 toc07

INPUT SIGNAL (µA)

EYEWIDTH (ns)

TA = -40°C

TA = +85°C

TA = +25°C

5000

5500

6000

6500

7000

-40 20-20 0 40 60 80 100

TRANSIMPEDANCE

vs. AMBIENT TEMPERATURE

MAX3760-05

AMBIENT TEMPERATURE (°C)

TRANSIMPEDANCE (Ω)

540

420

-40 30 100

TYPICAL BANDWIDTH

vs. JUNCTION TEMPERATURE

460

440

480

500

520

MAX760toc06

JUNCTION TEMPERATURE (°C)

3dB BANDWIDTH (MHz)

-5 65

CIN IS SOURCE CAPACITANCE PRESENTED TO DIE. INCLUDES PACKAGE PARASITIC, PIN DIODE, AND PARASITIC INTERCONNECT CAPACITANCE

CIN = 0.25pF

CIN = 0.75pF

CIN = 1.25pF

IN TO-56 HEADER

200

400

600

800

0 400200 600 800 1000

DATA-DEPENDENT JITTER

vs. INPUT SIGNAL AMPLITUDE

MAX3760-08

INPUT SIGNAL AMPLITUDE (µAp-p)

JITTER (ps pp)

- 1 PRBS 622Mbps r

= 10

-3.0

-2.4

-2.6

-2.8

-2.0

-2.2

-1.2

-1.4

-1.6

-1.8

-1.0

-40 20-20 0 40 60 80 100

OUTPUT COMMON-MODE VOLTAGE

vs. AMBIENT TEMPERATURE

MAX3760-09

AMBIENT TEMPERATURE (°C)

VOLTAGE (V)

REFERENCED TO V

__________________________________________Typical Operating Characteristics

(MAX3760 EV kit, VCC= +5.0V, COMP = open, TA= +25°C, unless otherwise noted.)

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