MAX3260 Datasheet, PDF (1/4 Pages) Maxim Integrated Products – 1GHz Transimpedance Preamplifier with 25dB Dynamic Range

19-0322; Rev 0; 10/94
1GHz Transimpedance Preamplifier
with 25dB Dynamic Range
_______________General Description
The MAX3260 high-speed transimpedance amplifier is
ideally suited for Fibre Channel and SDH/SONET appli-
cations. An extended dynamic range makes the
MAX3260 useful in optical receiver systems with as
much as 25dB of input signal range. A DC-restore feed-
back network prevents amplifier saturation in all Fibre
Channel applications by allowing input currents as high
as 900µA to be amplified linearly. To reduce noise, the
restore function is disabled at low input levels, allowing
detection of signals as small as 2.4µA with a signal-to-
noise ratio of 10.
The filter output (FILTER) of the MAX3260 provides a
convenient voltage source for a photodiode, especially
when the circuit will be placed into a TO-style header
with the photodiode. The filter output is connected to
VCC through a 1kΩ on-chip resistor. In combination
with a bypass capacitor, the filter function significantly
reduces the amount of noise present at the cathode of
the photodiode.
The MAX3260 operates from a single +5V supply con-
suming only 115mW of power when the output is AC
coupled. With 50Ω output termination, it consumes less
than 300mW of power.
________________________Applications
High-Speed Fiber Optics
531Mbps and 1062Mbps Fibre Channel
622Mbps SDH/SONET
Current-to-Voltage Converters
PIN-Preamp Headers
____________________________Features
o 1GHz Bandwidth
o Single 5V Supply
o 25dB Dynamic Range
o Optimized for TO-Style Header
______________Ordering Information
PART
MAX3260C/D
TJ RANGE
0°C to +100°C
PIN-PACKAGE
Dice
___________________Chip Topography
VCCB 1
I IN FILTER N.C. V_OUT
14
13
12
11
0.040"
(1.016mm)
10 GND
__________Typical Operating Circuit
FILTER
V_OUT
I_{IN MAX3260}
VCC GND
Zo = 50Ω
DOUT+
LIMITING
AMPLIFIER
MAX3262
DOUT-
DIN-
50Ω
+5V
VCCB 2
VCCA 3
VCCA 4
5
6
N.C.
GND
0.040"
(1.016mm)
TRANSISTOR COUNT: 16
SUBSTRATE CONNECTED TO GND
9 GND
8 GND
7 GND
________________________________________________________________ Maxim Integrated Products 1
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