MAX3963 Datasheet, PDF (1/6 Pages) Maxim Integrated Products – 155Mbps Preamplifier for FDDI and ATM LAN Fiber Optic Receivers

19-1215; Rev 1; 4/98
155Mbps Preamplifier for FDDI
and ATM LAN Fiber Optic Receivers
_______________General Description
The MAX3963 is a low-noise transimpedance preampli-
fier for FDDI and 155Mbps ATM optical receivers. The
MAX3963’s dynamic range is optimized for use in multi-
mode LED-based applications.
The preamplifier converts a small photodiode current to
a differential voltage, with typical transimpedance of
22kΩ. Input-referred noise of only 21nA allows detec-
tion of signals as small as 267nA, while pulse-width dis-
tortion is only 85ps with a 60µA input signal. In a
1300nm multimode receiver, with responsivity of
0.7A/W, the MAX3963’s dynamic range spans from
-36dBm to -13.7dBm. The circuit operates from a single
+5V supply, and typically consumes only 60mW power.
The MAX3963 die includes a filter connection, which
provides positive bias for the photodiode through a 1kΩ
resistor to V_CC. This feature, combined with the small
die size, allows the MAX3963 to fit easily into a TO-style
package with a photodiode.
The differential outputs are back terminated with 60Ω
per side, allowing the easy use of filters to improve sen-
sitivity.
The MAX3963 is designed to be used with the
MAX3964 limiting amplifier IC. It is available in an 8-pin
SO package and as dice.
________________________Applications
FDDI
155Mbps ATM
____________________________Features
♦ 21nA Total RMS Noise
♦ 22kΩ Differential Transimpedance
♦ 180MHz Bandwidth
♦ 60mW Typical Power Consumption
♦ 60µA Peak Input Current
♦ Low, 85ps Pulse-Width Distortion
______________Ordering Information
PART
TEMP. RANGE PIN-PACKAGE
MAX3963CSA
0°C to +70°C
8 SO
MAX3963C/D
0°C to +70°C* Dice
*Dice are designed to operate over a 0°C to +100°C junction
temperature (T_j) range, but are tested and guaranteed at T_A =
+25°C.
__________________Pin Configuration
TOP VIEW
N.C. 1
IN 2
N.C. 3
BYP 4
MAX3963
8 V_CC
7 OUT-
6 OUT+
5 GND
SO
__________________________________________________Typical Application Circuit
V_CC
0.01µF
100pF
1k
(FILTER)
V_CC
OUT+
0.056µF
PHOTODIODE
IN
MAX3963 _GND
( ) ARE FOR MAX3963C/D ONLY.
OUT-
BYP
C_BYP
100pF
(OPTIONAL)
0.056µF
MAX3964
LIMITING AMPLIFIER
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