MAX3665(2000) Просмотр технического описания (PDF) - Maxim Integrated
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производитель
MAX3665
(Rev.:2000)
(Rev.:2000)
Maxim Integrated
MAX3665 Datasheet PDF : 12 Pages
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622Mbps, Ultra-Low-Power, 3.3V
Transimpedance Preamplifier for SDH/SONET
_____________________________Typical Operating Characteristics (continued)
(VCC = +3.3V, includes off-chip filter, see Figure 3b, TA = +25°C, unless otherwise noted.)
DIFFERENTIAL OUTPUT AMPLITUDE
vs. TEMPERATURE (INPUT = 450µAp-p)
400
EYE DIAGRAM
(INPUT = 10µAp-p)
EYE DIAGRAM
(INPUT = 450µAp-p)
350
300
VCC = 5.0V
250
VCC = 3.3V
200
150
-40 -20 0 20 40 60 80 100
AMBIENT TEMPERATURE (°C)
INPUT: 213 - 1 PRBS
CONTAINS 100 ZEROS
200ps/div
INPUT: 213 - 1 PRBS
CONTAINS 100 ZEROS
200ps/div
_____________________Pin Description
PIN NAME
FUNCTION
1
VCC
+3.3V or +5.0V Supply Voltage
2
IN
Signal Input (from photodiode)
3
N.C.
No Connection. Not internally con-
nected.
4
FILT
On-Chip Resistor for Filtering
Photodiode Supply Voltage
5, 8
GND Ground
Noninverting Voltage Output. Current
6
OUT+ flowing into IN causes VOUT+ to
increase.
7
OUT-
Inverting Voltage Output. Current flow-
ing into IN causes VOUT- to decrease.
________________Detailed Description
The MAX3665 is a transimpedance amplifier designed
for 622Mbps SDH/SONET applications. It comprises a
transimpedance amplifier, a paraphase amplifier with
CML differential outputs, and a DC cancellation loop.
Figure 1 shows a functional diagram of the MAX3665.
Transimpedance Amplifier
The signal current at IN flows into the summing node of a
high-gain amplifier. Shunt feedback through RF converts
this current to a voltage. Diodes D1 and D2 clamp the
output voltage for large input currents.
VCC
D2
1.5k
FILT
D1
RF
VCC
VCC
R1
50Ω
OUT+
IN
Q1
PARAPHASE
AMP
Q2
VCC
R2 R5
50Ω
OUT-
Q3
VCC
R7
R6
Q5
REFERENCE AMP
R4
DC
Q4
CANCELLATION
AMP
GND
Figure 1. Functional Diagram
R3
MAX3665
4 _______________________________________________________________________________________
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