MAX3665 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 622Mbps, Ultra-Low-Power, 3.3V Transimpedance Preamplifier for SDH/SONET

19-1601; Rev 0; 1/00
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622Mbps, Ultra-Low-Power, 3.3V
Transimpedance Preamplifier for SDH/SONET
________________General Description
The MAX3665 low-power transimpedance preamplifier
for 622Mbps SDH/SONET applications consumes only
70mW at V_CC = 3.3V. Operating from a single +3.3V or
+5.0V supply, it converts a small photodiode current to a
measurable differential voltage. A DC cancellation circuit
provides a true differential output swing over a wide
range of input current levels, thus reducing pulse-width
distortion. The differential outputs are back-terminated
with 50Ω per side.
The overall transimpedance gain is nominally 8kΩ. For
input signal levels beyond approximately 50µAp-p, the
amplifier will limit the output swing to 250mV. The
MAX3665’s low 55nA input noise provides a typical
sensitivity of -33.2dBm in 1300nm, 622Mbps receivers.
The MAX3665 is designed to be used in conjunction
with the MAX3676 clock recovery and data retiming IC
with limiting amplifier. Together they form a complete
3.3V or 5.0V 622Mbps SDH/SONET receiver.
In die form, the MAX3665 is designed to fit on a header
with a PIN diode. It includes a filter connection that pro-
vides positive bias for the photodiode through a 1.5kΩ
resistor to V_CC. The device is available in an 8-pin
µMAX package.
____________________________Features
o +3.3V or +5.0V Single-Supply Operation
o 55nA_RMS Input-Referred Noise
o 70mW Power Consumption at V_CC = 3.3V
o 8kΩ Gain
o 450µA Peak Input Current
o 260ps max Deterministic Jitter
o Differential Output Drives 100Ω Load
o 470MHz Bandwidth
_______________Ordering Information
PART
MAX3665EUA
MAX3665E/D
TEMP. RANGE
-40°C to +85°C
(see Note)
PIN-PACKAGE
8 µMAX
Dice
Note: Dice are designed to operate over a -40°C to +140°C
junction temperature (T_j) range, but are tested and guaranteed
at T_A = +25°C.
________________________Applications _{Pin Configuration appears at end of data sheet.}
SDH/SONET Receivers
PIN Photodiode Preamplifiers and Receivers
Regenerators for SDH/SONET
__________________________________________________Typical Application Circuit
3.3V
0.01µF
R_FILT
V_CC
1.5k
MAX3665
FILT
C_FILT
IN
50Ω
OUT+
50Ω
OUT-
GND
0.1µF
0.1µF
3.3V
LIMITING
AMP
MAX3676
CLOCK
AND
DATA
RECOVERY
CLK
DATA
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