MAX3267 MAXIM [Maxim Integrated Products], MAX3267 Datasheet

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MAX3267

Manufacturer Part Number
MAX3267
Description
1.25Gbps/2.5Gbps, 3V to 5.5V, Low-Noise Transimpedance Preamplifiers for LANs
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet

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The MAX3266 is a transimpedance preamplifier for
1.25Gbps 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 solu-
tion for communications up to 2.5Gbps. It features
500nA input-referred noise, 1.9GHz bandwidth, and
1mA input overload.
Both devices operate from a single +3.0V to +5.5V sup-
ply 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 V
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 long-
wave configuration.
19-4796; Rev 0; 1/99
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
Gigabit Ethernet
1.0Gbps to 2.5Gbps Optical Receivers
Fibre Channel
CC
. These features allow easy assembly into a TO-46
C
400pF
FILTER
1.25Gbps/2.5Gbps, 3V to 5.5V, Low-Noise
________________________________________________________________ Maxim Integrated Products
Transimpedance Preamplifiers for LANs
General Description
PHOTODIODE
Applications
FILTER
IN
MAX3266
MAX3267
1.5k
V
CC
GND
V
CC
*
to +100°C but are tested and guaranteed only at T
0.01 F
Dice are designed to operate with junction temperatures of 0°C
MAX3266CSA
MAX3266C/D
MAX3267CSA
MAX3267C/D
OUT+
OUT-
200nA Input-Referred Noise (MAX3266)
500nA Input-Referred Noise (MAX3267)
920MHz Bandwidth (MAX3266)
1900MHz Bandwidth (MAX3267)
1mA Input Overload
Single +3.0V to +5.5V Supply Voltage
TOP VIEW
PART
0.1 F
0.1 F
Typical Application Circuit
FILTER
N.C.
V
100
CC
IN
1
2
4
3
TEMP. RANGE
0°C to +70°C
0°C to +70°C
Ordering Information
MAX3266
MAX3267
SO
Pin Configuration
LIMITING
AMPLIFIER
6
8
7
5
8 SO
Dice*
8 SO
Dice*
PIN-PACKAGE
GND
OUT+
OUT-
GND
Features
A
= +25°C.
1

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MAX3267 Summary of contents

Page 1

... The MAX3266 is a transimpedance preamplifier for 1.25Gbps 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 solu- tion for communications up to 2.5Gbps. It features 500nA input-referred noise, 1.9GHz bandwidth, and 1mA input overload. ...

Page 2

... CC A source capacitance = 0.85pF, unless otherwise noted.) (Note 1) PARAMETER Input Bias Voltage Supply Current Differential, measured Transimpedance with 30µAp-p signal (40µAp-p for MAX3267) Output Impedance Single-ended (per side) Maximum Differential Output Input = 1mAp-p Voltage Filter Resistor AC Input Overload DC Input Overload Die, packaged in TO-56 ...

Page 3

... Low-Noise Transimpedance Preamplifiers for LANs (V = +3.3V +25°C, MAX3266/MAX3267 EV kit, source capacitance = 0.85pF, unless otherwise noted MAX3266 INPUT-REFERRED NOISE vs. TEMPERATURE 250 C IS SOURCE CAPACITANCE IN PRESENTED TO DIE, INCLUDES 240 PACKAGE PARASITIC, PIN DIODE, AND PARASITIC INTERCONNECT 230 CAPACITANCE 220 ...

Page 4

... Low-Noise Transimpedance Preamplifiers for LANs (V = +3.3V +25°C, MAX3266/MAX3267 EV kit, source capacitance = 0.85pF, unless otherwise noted MAX3266 EYE DIAGRAM (INPUT = 10 Ap-p) 4mV/div 7 INPUT PRBS 160ps/div MAX3267 EYE DIAGRAM (INPUT = 1mAp-p) 7 INPUT PRBS 30mV/div 80ps/div PIN NAME 1 V Supply Voltage ...

Page 5

... Shunt feedback through R converts this current to a voltage with gain of approx- F imately 2.2kΩ (1.0kΩ for MAX3267). Schottky diodes clamp the output voltage for large input currents, as shown in Figure 3. The voltage amplifier converts single-ended signals to differential signals and introduces a voltage gain. ...

Page 6

Low-Noise Transimpedance Preamplifiers for LANs The MAX3266 includes a 1-pole lowpass filter which limits the circuit bandwidth and improves noise perform- ance. DC Cancellation Circuit The DC cancellation circuit uses low-frequency feed- back to remove the ...

Page 7

... Amplitude = 2P Optical Linear Range The MAX3266 has high gain, which limits the output when the input signal exceeds 30µAp-p (40µAp-p for MAX3267). The MAX3266 operates in a linear range for inputs not exceeding Linear Range 10 log ...

Page 8

... Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products OUT+ GND GND 0.50" (1.25mm) OUT- OUT+ TRANSISTOR COUNT: 320 SUBSTRATE CONNECTED TO GND Printed USA is a registered trademark of Maxim Integrated Products. Chip Topographies MAX3267 INPUT FILTER V CC GND 0.50" (1.25mm) OUT+ 0.030" (0.75mm) ...

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