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19-2105; Rev 0; 7/01

+3.3V, 2.5Gbps Low-Power

Transimpedance Amplifier

General Description

The MAX3271 transimpedance amplifier provides a

compact low-power solution for 2.5Gbps communica-

tions. It features 495nA input-referred noise, 2GHz

bandwidth, and 2mA AC input overload.

The MAX3271 is a compact 30mil x 50mil die and

requires no external compensation capacitor. It oper-

ates from a single +3.3V supply and consumes 83mW.

A space-saving filter connection is provided for positive

bias to the photodiode through a 750Ω resistor to V

CC

.

These features allow easy assembly into a TO-46 or

TO-56 header with a photodiode.

The MAX3271 has a typical optical dynamic range of

-21dBm to +3dBm in a shortwave configuration or

-24dBm to 0dBm in a longwave configuration. The

MAX3271 and MAX3272* provide a two-chip solution

for Gigabit Ethernet and Fibre Channel receiver appli-

cations.

o

Single +3.3V Power Supply

o

83mW Power Consumption

o

495nA Input-Referred-Noise

o

2GHz Bandwidth

o

2mA AC Input Overload

o

30mil x 50mil Die Size

Features

MAX3271

Applications

Gigabit Ethernet Optical Receivers

Fibre Channel Optical Receivers

System Interconnects

2.5Gbps Optical Receivers

SONET/SDH Receivers

PART

MAX3271E/D

MAX3271E/W

Ordering Information

TEMP. RANGE

-40°C to +85°C

PIN-PACKAGE

Dice

**

Wafer

**

Dice/wafers are designed to operate from -40°C to +85°C, but

are tested and guaranteed only at T

A

= +25°C.

Typical Application Circuit

+3.3V

0.1µF

V

CC

750Ω

C

FILTER

470pF

FILTER

PHOTODIODE

IN

TIA

OUT-

0.1µF

OUT+

100Ω

LIMITING

AMPLIFIER

OUT+

0.1µF

OUT-

GND

MAX3271

MAX3272*

*Future

product

________________________________________________________________

Maxim Integrated Products

1

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.

+3.3V, 2.5Gbps Low-Power

Transimpedance Amplifier

MAX3271

ABSOLUTE MAXIMUM RATINGS

Power-Supply Voltage (V

CC

) ................................-0.5V to +6.0V

Input Current (IN) ..................................................-4mA to +4mA

FILTER Current ................................…………..-12mA to +12mA

Voltage at OUT+, OUT- ..................(V

CC

- 1.5V) to (V

CC

+ 0.5V)

Operating Junction

Temperature Range (T

J

) ............……………-55°C to +150°C

Storage Ambient Temperature Range (T

stg

) ....-55°C to +150°C

Die Attach Temperature ..................................................+400°C

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.

ELECTRICAL CHARACTERISTICS

(V

CC

= +3.0V to +3.6V, T

A

= -40°C to +85°C. Typical values are at V

CC

= +3.3V, source capacitance = 0.85pF, T

A

= +25°C, unless

otherwise noted.) (Notes 1, 2)

PARAMETER

Input Bias Voltage

Power-Supply Current

Transimpedance

Small-Signal Bandwidth

Output Impedance

Maximum Differential Output Swing

Filter Resistor

AC Input Overload

DC Input Overload

Input-Referred Noise

Input-Referred Noise Density

Low-Frequency Cutoff

Transimpedance Linear Range

Deterministic Jitter

Power-Supply Noise Rejection

DJ

PSNR

I

N

(Note 3)

(Note 4)

-3dB, input

≤

20µA DC

0.95

≤

linearity

≤

1.05 (Note 3)

(Notes 3, 5)

10µAp-p input

20µAp-p

≤

input

≤

2mAp-p

40

18

12

36

40

30

psp-p

dB

2.0

1.0

495

11

50

655

BW

I

CC

40µAp-p input, differential out

(Note 3)

Single-ended

Input = 1mAp-p

2.1

1.5

42

185

SYMBOL

CONDITIONS

MIN

0.66

TYP

0.83

25

2.8

2

50

300

750

58

430

MAX

1.1

35

3.4

UNITS

V

mA

kΩ

GHz

Ω

mVp-p

Ω

mAp-p

mA

nA

RMS

pA/√Hz

kHz

µAp-p

∆V

CC

= 100mVp-p, f < 2MHz (Note 6)

Note 1:

Production test at room ambient temperature only. Die parameters are guaranteed by design and characterization at -40°C

and +85°C.

Note 2:

Source capacitance represents the total capacitance at the IN pad during characterization of the noise and bandwidth

parameters.

Note 3:

Guaranteed by design and characterization.

Note 4:

Input-referred noise density is I

N

/√BW. No external filters are used for the noise measurements.

Note 5:

Deterministic jitter is measured with a K28.5 pattern (0011 1110 1011 0000 0101).

Note 6:

Power-supply noise rejection PSNR = -20log(∆V

OUT

/∆V

CC

), where

∆V

OUT

is the differential output voltage and

∆V

CC

is the

noise on V

CC

.

2

_______________________________________________________________________________________

+3.3V, 2.5Gbps Low-Power

Transimpedance Amplifier

Typical Operating Characteristics

(V

CC

= +3.3V, C

IN

= 0.85pF, T

A

= +25°C, unless otherwise noted.)

MAX3271

INPUT-REFERRED NOISE

vs. TEMPERATURE

MAX3271 toc01

FREQUENCY RESPONSE

MAX3271 toc02

DETERMINISTIC JITTER

vs. INPUT AMPLITUDE

45

DETERMINISTIC JITTER (psp-p)

40

35

30

25

20

15

10

5

K28.5 DATA

STREAM

r

e

= 6dB

MAX3271 toc03

750

INPUT-REFERRED NOISE (nA

RMS

)

700

650

600

550

500

450

400

350

-50

-25

0

25

50

75

C

IN

= 0.85pF

C

IN

= 0.5pF

C

IN

IS SOURCE CAPACITANCE PRESENTED

TO DIE, INCLUDING PACKAGE

PARASITIC, PIN DIODE, AND PARASITIC

INTERCONNECT CAPACITANCE

70

65

TRANSIMPEDANCE (dBΩ)

60

55

50

45

40

50

0

10M

100M

1G

10G

0.01

0.1

1

10

FREQUENCY (Hz)

INPUT AMPLITUDE (mAp-p)

100

JUNCTION TEMPERATURE (°C)

SMALL-SIGNAL TRANSIMPEDANCE

vs. TEMPERATURE

MAX3271 toc04

BANDWIDTH

vs. TEMPERATURE

MAX3271 toc05

EYE DIAGRAM (INPUT = 20µAp-p)

MAX3271 toc06

70

69

TRANSMIPEDANCE (dBΩ)

68

67

66

65

64

63

62

61

60

-50

-25

0

25

50

75

2500

2400

2300

BANDWIDTH (MHz)

2200

2100

2000

1900

1800

1700

1600

1500

C

IN

= 1.5pF

C

IN

= 1.0pF

C

IN

= 0.5pF

9.5mV/div

INPUT: 2

13

-1 PRBS

-50

-25

0

25

50

75

100

57ps/div

JUNCTION TEMPERATURE (°C)

100

JUNCTION TEMPERATURE (°C)

EYE DIAGRAM (INPUT = 2mAp-p)

MAX3271 toc07

150

OUPUT VOLTAGE (mVp-p)

100

50

0

-50

-100

-150

53mV/div

INPUT: 2

13

-1 PRBS

57ps/div

-200

-200 -150 -100 -50

0

50

100 150 200

INPUT CURRENT (µA)

_______________________________________________________________________________________

MAX3271 toc08

200

DC TRANSFER FUNCTION

(V

FILT

= 0V)

3

+3.3V, 2.5Gbps Low-Power

Transimpedance Amplifier

MAX3271

Typical Operating Characteristics (continued)

(V

CC

= +3.3V, C

IN

= 0.85pF, T

A

= +25°C, unless otherwise noted.)

DIFFERENTIAL OUTPUT REFLECTION

COEFFICIENT

MAX3271 toc09

OUTPUT AMPLITUDE vs. TEMPERATURE

(INPUT = 1mAp-p)

350

AMPLITUDE (mVp-p)

300

250

200

150

100

50

0

MAX3271 toc10

0

-5

-10

S22 (dB)

-15

-20

-25

-30

-35

0

500

1000

1500

2000

2500

400

3000

-50

-25

0

25

50

75

100

FREQUENCY (MHz)

JUNCTION TEMPERATURE (°C)

Pin Description

BOND PAD

1

2

3

4, 5

6, 9

7

8

NAME

FILTER

N.C.

IN

V

CC

GND

OUT+

OUT-

FUNCTION

Provides bias voltage for the photodiode through a 750Ω resistor to V

CC

. When grounded, this pin

disables the DC-cancellation amplifier to allow a DC path from IN to OUT+ and OUT- for testing.

No Connection. Leave unconnected.

TIA Input

Power Supply. Both pads must be connected to supply. Bond pad 4 supplies power to the

transimpedance stage. Bond pad 5 supplies power to the remaining circuitry.

Ground. Both pads must be connected to ground. Bond pad 9 is ground for the transimpedance stage.

Bond pad 6 is ground for the remaining circuitry.

Noninverted Data Output. Current flowing into IN causes V

OUT+

to increase.

Inverted Data Output. Current flowing into IN causes V

OUT

- to decrease.

4

_______________________________________________________________________________________

+3.3V, 2.5Gbps Low-Power

Transimpedance Amplifier

Detailed Description

The MAX3271 is a transimpedance amplifier designed

for 2.5Gbps fiber optic applications. A functional dia-

gram of the MAX3271 is shown in Figure 1. The

MAX3271 is comprised of a transimpedance amplifier

stage, a voltage amplifier stage, an output buffer, and a

direct current feedback cancellation circuit.

Output Buffer

The output buffer provides a reverse-terminated volt-

age output. The buffer is designed to drive a 100Ω dif-

ferential load between OUT+ and OUT-. The output

current is divided between internal 50Ω resistors and

the external load resistor. In the

Typical Applications

Circuit,

this creates a voltage-divider with gain of 1/2 for

a 100Ω differential load. The MAX3271 can also be ter-

minated with higher output impedances, which increas-

es gain and output voltage swing but lowers

bandwidth.

For optimum supply-noise rejection, the MAX3271

should be terminated with a differential load. If a single-

ended output is required, the unused output should be

similarly terminated. The MAX3271 will not drive a DC-

coupled 50Ω grounded load.

MAX3271

Transimpedance Amplifier Stage

The signal current at the input flows into the summing

node of a high-gain amplifier. Shunt feedback through

the resistor R

F

converts this current to a voltage. In par-

allel with the feedback are two back-to-back Schottky

diodes that clamp the output signal for large input cur-

rents as shown in Figure 2.

Voltage Amplifier Stage

The voltage amplifier stage provides gain and converts

the single-ended input to differential outputs.

MAX3271

R

F

TRANSIMPEDANCE

AMPLIFIER

IN

50Ω

VOLTAGE

AMPLIFIER

OUTPUT

BUFFER

50Ω

OUT+

OUT-

LOWPASS FILTER

V

CC

DISABLE

750Ω

FILTER

DC CANCELLATION

CIRCUIT

V

CC

GND

Figure 1. Functional Diagram

_______________________________________________________________________________________

5

MAX3271W

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