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19-0479; Rev 1; 7/97
EVALUATION KIT
AVAILABLE
________________General Desc ription
The MAX3664 low-power transimpedance preamplifier
for 622Mbps SDH/SONET applications consumes only
85mW. Operating from a single +3.3V supply, it converts
a small photodiode current to a measurable differential
voltage. A DC cancellation circuit provides a true differ-
ential output swing over a wide range of input current
levels, thus reducing pulse-width distortion. The differen-
tial outputs are back-terminated with 60
per side.
The transimpedance gain is nominally 6k
. For input
signal levels beyond approximately 100μAp-p, the
amplifier will limit the output swing to 900mV. The
MAX3664’s low 55nA input noise provides a typical
sensitivity of -33.2dBm in 1300nm, 622Mbps receivers.
The MAX3664 is designed to be used in conjunction
with the MAX3675 clock recovery and data retiming IC
with limiting amplifier. Together, they form a complete
3.3V, 622Mbps SDH/SONET receiver.
In die form, the MAX3664 is designed to fit on a header
with a PIN diode. It includes a filter connection, which
provides positive bias for the photodiode through a 1k
resistor to V
CC
. The device is also available in 8-pin SO
and μMAX packages.
________________________Applic ations
SDH/SONET Receivers
PIN/Preamplifier Receivers
Regenerators for SDH/SONET
____________________________Features
o
Single +3.3V Supply Operation
o
55nA
RMS
Input-Referred Noise
o
6k
Gain
o
85mW Power
o
300μA Peak Input Current
o
200ps Max Pulse-Width Distortion
o
Differential Output Drives 100
Load
o
590MHz Bandwidth
M
622Mbps, Ultra-Low-Power, 3.3V
Transimpedanc e Preamplifier for S DH/S ONET
________________________________________________________________ Maxim Integrated Products
1
MAX3664
MAX3675
LIMITING
AMP
100pF
INREF2
INREF1
1k
V
CC
100
0.01
μ
F
47nF
V
CC
(+3.3V)
DATA
CLK
( ) ARE FOR MAX3664E/D (DICE) ONLY.
47nF
400pF
OUT+
OUT-
COMP
GND
V
CC
(+3.3V)
(FILT)
IN
DATA
AND
CLOCK
RECOVERY
__________________________________________________Typic al Applic ation Circ uit
PART
MAX3664E/D
MAX3664ESA
MAX3664EUA*
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
PIN-PACKAGE
Dice
8 SO
8 μMAX
_______________Ordering Information
Pin Configuration appears at end of data sheet.
*Contact factory for package availability.