19-0322; Rev 0; 10/94
1 GHz Tra n s im p e d a n c e P re a m p lifie r
w it h 2 5 d B Dyn a m ic Ra n g e
MAX3260
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
♦ 1GHz Bandwidth
The MAX3260 high-speed transimpedance amplifier is
ideally suited for Fibre Channel and SDH/SONET appli-
c a tions . An e xte nd e d d yna mic ra ng e ma ke s 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.
♦ Single 5V Supply
♦ 25dB Dynamic Range
♦ Optimized for TO-Style Header
______________Ord e rin g In fo rm a t io n
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
PART
T
RANGE
PIN-PACKAGE
J
MAX3260C/D
0°C to +100°C
Dice
V
CC
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.
___________________Ch ip To p o g ra p h y
________________________Ap p lic a t io n s
High-Speed Fiber Optics
I
14
FILTER
13
N.C.
12
V
OUT
11
IN
531Mbps and 1062Mbps Fibre Channel
622Mbps SDH/SONET
0. 040"
Current-to-Voltage Converters
PIN-Preamp Headers
(1. 016mm)
10 GND
1
B
V
CC
9
8
7
GND
V
B 2
CC
__________Typ ic a l Op e ra t in g Circ u it
GND
GND
3
A
V
CC
DOUT+
LIMITING
V
CC
A 4
AMPLIFIER
MAX3262
FILTER
DOUT-
5
6
V
OUT
Z = 50Ω
o
DIN-
N.C.
GND
I
IN
MAX3260
GND
0. 040"
(1. 016mm)
V
CC
50Ω
TRANSISTOR COUNT: 16
SUBSTRATE CONNECTED TO GND
+5V
________________________________________________________________ Maxim Integrated Products
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .