MAXIM MAX3266, MAX3267 User Manual

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General Description

The MAX3266 is a transimpedance preamplifier for

1.25Gbps local area network (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 solu­tion for communications up to 2.5Gbps. It features
500nA input-referred noise, 1.9GHz bandwidth, and
1mA input overload.

Both devices operate from a +3.0V to +5.5V single sup­ply and require no compensation capacitor. They also
include a space-saving filter connection that provides
positive bias for the photodiode through a 1.5kΩ resistor
to VCC. These features allow easy assembly into a TO-46
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 long­wave configuration.

Applications

Gigabit Ethernet

1Gbps to 2.5Gbps Optical Receivers

Fibre Channel

Features

♦ 200nA Input-Referred Noise (MAX3266)

500nA Input-Referred Noise (MAX3267)

♦ 920MHz Bandwidth (MAX3266)

1900MHz Bandwidth (MAX3267)

♦ 1mA Input Overload
♦ +3.0V to +5.5V Single-Supply Voltage

MAX3266/MAX3267

1.25Gbps/2.5Gbps, +3V to +5.5V, Low-Noise
Transimpedance Preamplifiers for LANs

________________________________________________________________ Maxim Integrated Products 1

Typical Application Circuit

19-4796; Rev 1; 6/00

PART

MAX3266CSA

MAX3266C/D —

0°C to +70°C

TEMP. RANGE PIN-PACKAGE

8 SO

Dice*

EVALUATION KIT

AVAILABLE

*Dice are designed to operate over a -40°C to +140°C junction tem­perature (Tj) range, but are tested and guaranteed at TA= +25°C.

Pin Configuration

Ordering Information

MAX3267CSA

MAX3267C/D —

0°C to +70°C 8 SO

Dice*

MAX3267ESA -40°C to +85°C 8 SO

MAX3267E/D — Dice*

For free samples and the latest literature, visit www.maxim-ic.com or phone [phone].
For small orders, phone [phone].

TOP VIEW

V

1

CC

2

MAX3266

IN

MAX3267

3

4

SO

87GND

OUT+N.C.

OUT-

6

GNDFILTER

5

V

CC

0.01µF

1.5k

C

FILTER

400pF

PHOTODIODE

FILTER

IN

MAX3266
MAX3267

V

GND

CC

OUT+

OUT-

0.1µF

100Ω

0.1µF

LIMITING
AMPLIFIER

ps

MAX3266/MAX3267

1.25Gbps/2.5Gbps, +3V to +5.5V, Low-Noise
Transimpedance Preamplifiers for LANs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS—MAX3266C/MAX3267C

(VCC= +3.0V to +5.5V, TA= 0°C to +70°C, 100Ω load between OUT+ and OUT-. Typical values are at TA = +25°C, V

CC

= 3.3V,

source capacitance = 0.85pF, unless otherwise noted.) (Note 1)

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.

Supply Voltage (V

CC

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

IN Current..............................................................-4mA to +4mA

FILTER Current......................................................-8mA to +8mA

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

CC

- 1.5V) to (V

CC

+ 0.5V)

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SO (derate 6.7mW/°C above +70°C)..................533mW

Storage Temperature Range .............................-55°C to +150°C

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

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

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

MAX3267

MAX3266

MAX3267

MAX3266

MAX3267

MAX3266

MAX3266

MAX3267

MAX3266

Power-Supply Rejection Ratio
(PSRR)

50 dB

Output referred, f < 2MHz,
PSRR = -20log (∆V

OUT

/∆VCC)

19 76

Transimpedance Linear Range

40

µAp-p

30

Low-Frequency Cutoff 44 kHz

750 920 1100

Small-Signal Bandwidth

1530 1900 2420

MHz

Peak-to-peak,

0.95 < linearity < 1.05

-3dB, input ≤ 20µA DC

6.6

Input-Referred RMS Noise

485 655

nA

200

DC Input Overload

AC Input Overload 1.0 mAp-p

0.65 mA

192 256

SO package
(Note 2)

Die, packaged in TO-56
header (Note 2)

PARAMETER MIN TYP MAX UNITS

Filter Resistor 1220 1500 1860 Ω

Output Impedance 48 50 52 Ω

Transimpedance

1540 1900 2330

Ω

Supply Current

Input Bias Voltage 0.69 0.83 0.91 V

26 50 mA

2260 2800 3400

CONDITIONS

Single ended (per side)

Differential, measured
with 30µAp-p signal
(40µAp-p for MAX3267)

Maximum Differential Output
Voltage

185 250 415 mVp-pInput = 1mAp-p

MAX3266
MAX3267

Input-Referred Noise Density

11.0

pA/(Hz)

1/2

(Note 2)

Deterministic Jitter

12 50

ps(Note 3)

MAX3266

MAX3267

MAX3266/MAX3267

1.25Gbps/2.5Gbps, +3V to +5.5V, Low-Noise
Transimpedance Preamplifiers for LANs

_______________________________________________________________________________________ 3

Note 1: Source Capacitance represents the total capacitance at the IN pin during characterization of noise and bandwidth parame-

ters. Figure 1 shows the typical source capacitance vs. reverse voltage for the photodiode used during characterization of
TO-56 header packages. Noise and bandwidth will be affected by the source capacitance. See the Typical Operating
Characteristics for more information.

Note 2: Input-Referred Noise is calculated as RMS Output Noise / (Gain at f = 10MHz). Noise Density is (Input-Referred Noise) /

√bandwidth. No external filters are used for the noise measurements.

Note 3: Deterministic Jitter is measured with the K28.5 pattern applied to the input [00111110101100000101].

Peak-to-peak, 0.95 < linearity < 1.05

SO package (Note 2)

Differential, measured with 40µAp-p signal

Power-Supply Rejection Ratio
(PSRR)

50 dB

Output referred, f < 2MHz,
PSRR = -20log (∆V

OUT

/∆VCC)

Transimpedance Linear Range 40 µAp-p

Low-Frequency Cutoff 24 kHz

Small-Signal Bandwidth 1515 1900 2550 MHz

-3dB, input ≤ 20µA DC

Deterministic Jitter 14 50

Input-Referred RMS Noise 485 668 nA

(Note 2)

DC Input Overload

AC Input Overload 1.0 mAp-p

0.65 mA

ps

PARAMETER MIN TYP MAX UNITS

Filter Resistor 1210 1500 1865 Ω

Input-Referred Noise Density 11.0 pA/(Hz)

1/2

Output Impedance 47.7 50 52.1 Ω

Transimpedance Ω

Supply Current

Input Bias Voltage 0.67 0.83 0.97 V

26 53.2 mA

1470 1900 2355

CONDITIONS

Single ended (per side)

Maximum Differential Output
Voltage

155 250 430 mVp-pInput = 1mAp-p

(Note 3)

ELECTRICAL CHARACTERISTICS—MAX3267E

(VCC= +3.0V to +5.5V, TA= -40°C to +85°C, 100Ω load between OUT+ and OUT-. Typical values are at TA = +25°C, V

CC

= 3.3V,

source capacitance = 0.85pF, unless otherwise noted.) (Note 1)