19-1215; Rev 1; 4/98
155Mbps Preamplifier for FDDI
and ATM LAN Fiber Optic Receivers
____________________________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 (Tj) range, but are tested and guaranteed at TA =
+25°C.
__________________Pin Configuration
TOP VIEW
N.C. 1
IN 2
________________________Applications
8
MAX3963
VCC
7
OUT-
FDDI
N.C. 3
6
OUT+
155Mbps ATM
BYP 4
5
GND
SO
__________________________________________________Typical Application Circuit
VCC
0.01µF
VCC
1k
0.056µF
(FILTER)
OUT+
100pF
PHOTODIODE
MAX3964
IN
OUT-
MAX3963
( ) ARE FOR MAX3963C/D ONLY.
GND
BYP
0.056µF
LIMITING AMPLIFIER
CBYP
100pF
(OPTIONAL)
________________________________________________________________ Maxim Integrated Products
1
For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX3963
_______________General Description
The MAX3963 is a low-noise transimpedance preamplifier for FDDI and 155Mbps ATM optical receivers. The
MAX3963’s dynamic range is optimized for use in multimode 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 detection of signals as small as 267nA, while pulse-width distortion 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 VCC. 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 sensitivity.
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.
