MAX3266 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – 1.25Gbps/2.5Gbps, 3V to 5.5V, Low-Noise Transimpedance Preamplifiers for LANs

19-4796; Rev 0; 1/99
EVAALVUAAILTAIOBNLEKIT
1.25Gbps/2.5Gbps, 3V to 5.5V, Low-Noise
Transimpedance Preamplifiers for LANs
General Description
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_CC. 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 long-
wave configuration.
Applications
Gigabit Ethernet
1.0Gbps to 2.5Gbps Optical Receivers
Fibre Channel
Features
o 200nA Input-Referred Noise (MAX3266)
500nA Input-Referred Noise (MAX3267)
o 920MHz Bandwidth (MAX3266)
1900MHz Bandwidth (MAX3267)
o 1mA Input Overload
o Single +3.0V to +5.5V Supply Voltage
Ordering Information
PART
MAX3266CSA
MAX3266C/D
MAX3267CSA
MAX3267C/D
TEMP. RANGE
0°C to +70°C
—
0°C to +70°C
—
PIN-PACKAGE
8 SO
Dice*
8 SO
Dice*
*Dice are designed to operate with junction temperatures of 0°C
to +100°C but are tested and guaranteed only at T_A = +25°C.
Pin Configuration
TOP VIEW
V_CC 1
N.C. 2
IN 3
FILTER 4
MAX3266
MAX3267
8 GND
7 OUT+
6 OUT-
5 GND
SO
C_FILTER
400pF
V_CC
0.01µF
PHOTODIODE
1.5k
FILTER
IN
V_CC
OUT+
MAX3266
MAX3267
OUT-
GND
Typical Application Circuit
0.1µF
100Ω
0.1µF
LIMITING
AMPLIFIER
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