T46L
TO-46L Lens Package
FEATURES
1.25 Gb/s Differential Output TIA
5.0V Operation
Automatic Gain Control
850nm Photodetector with 100
m
m
2
Active Area
Integrated MSM Detector & TIA
TO46 Lens Package
APPLICATIONS
Gigabit Ethernet (1.25 Gb/s)
Fiber Channel (1.0625 Gb/s)
AMT8100
1.25 Gb/s Integrated 850 nm MSM-TIA
Data Sheet - Rev1
Product Description
The ANADIGICS AMT8100 is a 5V monolithically
integrated Metal-Semiconductor-Metal (MSM)
photodetector and transimpedance amplifier (TIA)
used to convert an 850nm input optical signal into a
differential output voltage, and is manufactured in
ANADIGICS 6 GaAs wafer fabrication facility. The
integrated MSM and TIA receiver maximizes the
receiver performance by minimizing the
photodetector input parasitics to the TIA and
US Patents: 5047728, 5646573
4K
AGC
OUT
OUT
V
DD
4
2
1
3
Figure 1: AMT8100T46L Equivalent Circuit
internally biasing the photodetector to achieve high
sensitivity, bandwidth and overload performance. As
an integrated product the reliability is inherently
better than a discrete solution, and both the MSM-TIA
integrated circuit and TO46 lens packaged
receiver pass stringent reliability requirements.
These products are readily designed into receivers
and transceivers for Gigabit Ethernet and Fibre
Channel applications.
P
IN
2
AMT8100
Data Sheet - Revision 1
03/01
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Table 1: Absolute Maximum Ratings
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Table 3: Package Pin Description
Table 2: Electrical Characteristics
(1) Measured at 14 dBm optical input power with output connected into R
L
= 100W
(differential)
(2) Measured at 10
-12
BER with a 2
7
-1 PRBS at 1.25 GB/s
(3) Measured at 10
-10
BER with a 2
7
-1 PRBS at 1.25 Gb/s.
(4) Input optical power = -3 dBm, R
L
= 100 W (differential).
(5) Measured with a 625 MHz, 50% duty cycle square wave.
(6) Measured with a 1.25 Gb/s, 2
7
-1 PRBS.
(7) 1s about the center eye crossing.
(8) 6s about the center eye crossing.
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C
3
AMT8100
Data Sheet - Revision 1
03/01
10mV/Div 200ps/Div
Figure 2: Eye Diagram with an Optical Input Power
of 17dBm
Figure 3: Eye Diagram with an Optical Input Power
of 1.0dB
150mV/Div 200ps/Div
Figure 4: Supply Current vs. Temperature
Figure 5: Bandwidth vs. Temperature
Figure 6: Differential Responsvity vs. Temperature
Figure 7: Sensitivity vs. Temperature
20.0
25.0
30.0
35.0
40.0
45.0
50.0
0
20
40
60
80
100
Ambient Temperature (C)
S
uppl
y C
u
rrent (m
A
)
4.5V
5.0V
5.5V
600.0
800.0
1000.0
1200.0
1400.0
1600.0
0
20
40
60
80
100
Ambient Temperature (C)
B
andw
i
d
th (M
H
z
)
4.5V
5.0V
5.5V
1000.0
1200.0
1400.0
1600.0
0
20
40
60
80
100
Ambient Temperature (C)
D
i
fferenti
a
l
R
e
sponsi
v
i
t
y (V
/W
)
4.5V
5.0V
5.5V
-24.0
-23.5
-23.0
-22.5
-22.0
-21.5
-21.0
-20.5
-20.0
0
20
40
60
80
100
Ambient Temperature (C)
Se
n
s
itivity (
d
Bm
)
4.5V
5.0V
5.5V
5
AMT8100
Data Sheet - Revision 1
03/01
Figure 11: DUT Test Fixture Schematic
V OUT
VOUT
DUT
0.1 uF
0.1uF
0.1uF
V
DD
4K
AGC
OUT
OUT
V
DD
4
2
1
3
LIMITING
AMPLIFIER
0.1uF
0.1uF
C
F
R
O
0.1uF
Figure 12: Application Schematic
C
F
is an optional single pole noise filter
f
c
is the desired cutoff frequency
R
= 50 W
R
O
is required with high input resistance limiting amplifiers
R
O
= 100 W
fcR
C
F
=
2
1
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