AMT128503
1.25 Gb/s Integrated 850 nm MSM-TIA
Data Sheet - Rev. 0
FEATURES
1.25 Gb/s Differential Output TIA
3.3V Operation
Automatic Gain Control
850nm Photodetector with
100 mm x 100 mm
Active Area
Integrated MSM detector & TIA
TO-46 Ultra Flat Window or Lens
Package
TO-56 Ultra Flat Window Package
APPLICATIONS
Gigabit Ethernet (1.250Gb/s)
Fibre Channel (1.0625 Gb/s)
TO-46L
Lens
Package
TO-46F
Ultra Flat
Window
Package
TO-56F
Ultra Flat
Window
Package
PRODUCT DESCRIPTION
The ANADIGICS AMT128503 is a 3.3V 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
Figure 1: AMT128503 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 flat window, TO46 lens
and TO56 flat window packaged receiver pass
stringent reliability requirements. These products
are readily designed into receivers and transceivers
for Gigabit Ethernet and Fibre Channel applications.
US Patents: 5047728, 5646573
4K
Charge
Pump
6.5 GHz
Osc
AGC
V
DD
V
OUT
V
OUT
Ground
P
IN
2
Data Sheet - Revision 0
03/01
AMT128503
V
D
D
V
0
.
6
P
N
I
m
B
d
5
+
T
S
C
5
2
1
o
t
C
5
6
-
.
p
m
e
T
e
g
a
r
o
t
S
Table 1: Absolute Maximum Ratings
(1) Measured at 14 dBm optical input power with output connected into R
L
= 100W (differential)
(2) Measured at 10
-10
BER with a 2
7
-1 PRBS at 1.25 GB/s
(3) Input optical power = -3 dBm, R
L
= 100 W (differential).
(4) Measured with a 625 MHz, 50% duty cycle square wave.
(5) Measured with a 1.25 Gb/s, 2
7
-1 PRBS.
(6) 1s about the center eye crossing.
(7) 6s about the center eye crossing.
Table 2: Electrical Characteristics
Table 3: Package Pin Description
R
E
T
E
M
A
R
A
P
N
I
M
P
Y
T
X
A
M
T
I
N
U
)
(
h
t
g
n
e
l
e
v
a
W
0
7
7
0
5
8
0
6
8
m
n
a
e
r
A
e
v
it
c
A
r
o
t
c
e
t
e
D
0
0
1
x
0
0
1
m
y
ti
v
i
s
n
o
p
s
e
R
l
a
it
n
e
r
e
ff
i
D
l
a
n
g
i
S
ll
a
m
S
)
1
(
)
z
H
M
0
5
@
(
0
0
0
1
W
/
V
h
t
d
i
w
d
n
a
B
)
1
(
0
0
0
1
0
0
5
1
z
H
M
ff
o
t
u
C
y
c
n
e
u
q
e
r
F
w
o
L
0
0
3
0
0
0
1
z
H
k
e
c
n
a
t
s
i
s
e
R
t
u
p
t
u
O
5
2
0
4
0
6
d
a
o
lr
e
v
O
l
a
c
it
p
O
)
2
(
0
m
B
d
y
ti
v
it
i
s
n
e
S
l
a
c
it
p
O
)
2
(
0
2
-
2
2
-
m
B
d
e
g
a
tl
o
V
t
u
p
t
u
O
l
a
it
n
e
r
e
ff
i
D
)
4
(
,)
3
(
0
0
7
V
m
T
E
S
I
R
T
&
L
L
A
F
)
%
0
8
-
0
2
(
)
4
(
,)
3
(
0
6
2
s
p
n
o
it
r
o
t
s
i
D
e
l
c
y
C
y
t
u
D
)
5
(
,)
3
(
4
0
1
%
r
e
tt
i
J
S
M
R
)
6
(
,)
5
(
,)
3
(
5
1
s
p
)
k
p
-
k
p
(
r
e
tt
i
J
l
a
t
o
T
)
7
(
,)
5
(
,)
3
(
0
9
s
p
t
n
e
rr
u
C
y
l
p
p
u
S
5
5
A
m
e
g
n
a
R
e
g
a
tl
o
V
g
n
it
a
r
e
p
O
0
.
3
+
3
.
3
+
6
.
3
+
V
e
g
n
a
R
e
r
u
t
a
r
e
p
m
e
T
t
n
e
i
b
m
A
g
n
it
a
r
e
p
O
0
0
7
C
l
W
N
I
P
n
o
it
p
i
r
c
s
e
D
L
6
4
T
/
F
6
4
T
n
o
it
p
i
r
c
s
e
D
F
6
5
T
1
V
T
U
O
)
d
e
tr
e
v
n
i-
n
o
n
(
e
g
a
tl
o
V
t
u
p
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O
A
I
T
-
t
u
p
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i
l
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c
it
p
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w
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1
'
l
a
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V D
D
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l
p
p
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S
e
v
it
i
s
o
P
-
2
V D
D
e
g
a
tl
o
V
y
l
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V
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)
d
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tr
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v
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i(
e
g
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t
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p
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w
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1
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l
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3
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d
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g
a
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o
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t
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it
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w
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l
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d
e
d
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i
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c
(
d
n
u
o
r
G
4
)
d
e
d
n
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o
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a
c
(
d
n
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o
r
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V
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d
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e
v
n
i-
n
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n
(
3
AMT128503
Data Sheet - Revision 0
03/01
Figure 2: Eye Diagram with an Optical Input
Power of -17dBm
Figure 3: Eye Diagram with an Optical Input
Power of -1.0dBm
Figure 4: Supply Current vs Temperature
Figure 5: Bandwidth vs. Temperature
Figure 6: Differential Responsivity vs Temperature
Figure 7: Sensitivity vs Temperature
25.0
30.0
35.0
40.0
45.0
50.0
0
20
40
60
80
100
Ambient Temperature (C)
S
uppl
y
Cur
r
ent (
m
A
)
3V
3.3V
3.6V
900
1000
1100
1200
1300
1400
1500
1600
0
20
40
60
80
100
Ambient Temperature (C)
B
andwi
dth (
M
Hz
)
3V
3.3V
3.6V
1000
1200
1400
1600
1800
2000
0
20
40
60
80
100
Ambient Temperature (C)
Di
ffer
enti
a
l
Res
pons
i
v
i
t
y
(
V
/W
)
3V
3.3V
3.6V
-25.00
-24.50
-24.00
-23.50
-23.00
-22.50
-22.00
0
20
40
60
80
100
Ambient Temperature (C)
Se
n
s
it
ivit
y (
d
Bm)
3V
3.3V
3.6V
15mV/Div
200ps/Div
175mV/Div
200ps/Div
5
AMT128503
Data Sheet - Revision 0
03/01
V
OUT
V
OUT
DUT
0.1 uF
0.1uF
0.1uF
V
DD
Figure 11: DUT Test Fixture Schematic
Figure 12: Application Schematic
LIMITING
AMPLIFIER
4K
Charge
Pump
AGC
OUT
OUT
V
DD
4
2
1
3
0.1uF
0.1uF
C
F
R
O
0.1uF
6.5 GHz
OSC
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
f
c
R
C
F
=
2
1
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