D1 Package
FEATURES
·
Differential Output Topology
·
DC Output Offset Control (external loop)
·
Low Group Delay
·
DC Coupled Outputs
·
-5.2V Power Supply
·
InGaP HBT Technology
APPLICATIONS
·
SONET OC-192/STM-64
·
10Gb/s DWDM
·
10Gb/s Datacom
PRODUCT DESCRIPTION
ATA7602
10GB/s Offset Control TIA
Advanced Product Information - Rev 0
The ANADIGICS ATA7602 is a -5.2V high speed
transimpedance amplifier (TIA) for 10Gb/s
applications available in bare die form and
manufactured using an InGaP HBT process. The
device is used in conjunction with a photodetector to
convert an optical signal into a differential voltage
that can be AC or DC coupled to a post amplifier.
The DC offset between the two outputs can be adjusted
in order to maintain low dury cycle distortion for large
signal operation or to provide an adjustable decision
threshold for the post amplifier.
Figure 1: Block Diagram
3
Advanced Product Information - Revision 0
03/01
ATA7602
AC Electrical Characteristics (V
EE
=-5.2V+/-0.3V, C
DIODE
+C
STRAY
=0.3
P
F, L
BOND
=0.7nH)
(1) Optical input power = -19 to 0dBm, F
c
= 9.5GHz
(2) Responsivity of the photodiode = 0.95A/W typical, laser extinction ratio=10dB
(3) BER: 10
-10
; 9.95328Gbps NRZ pattern; PRBS 2
31
-1, l=1.55mm
(4) External 1nF Capacitor Required (C
ext
: see figure 3)
(5) Measurements made in reference fixture with open cavity
fiber alignment. Improvements in coupling will result in better performance.
R
E
T
E
M
A
R
A
P
N
I
M
P
Y
T
X
A
M
T
I
N
U
R
(
e
c
n
a
d
e
p
m
i
s
n
a
r
T
l
a
it
n
e
r
e
ff
i
D
l
a
n
g
i
S
ll
a
m
S
L
)
0
0
1
=
0
0
0
2
0
0
2
2
R
(
g
n
i
w
S
e
g
a
tl
o
V
t
u
p
t
u
O
m
u
m
i
x
a
M
L
)
0
5
=
0
0
6
0
0
7
0
0
8
p
p
V
m
n
o
it
a
r
u
t
a
S
t
u
p
t
u
O
%
0
8
@
t
n
e
rr
u
C
t
u
p
n
I
0
5
5
p
p
A
I
;
B
d
3
-(
h
t
d
i
w
d
n
a
B
t
u
p
n
i
)
k
p
-
k
p
A
m
5
6
.
1
=
<
5
.
8
5
.
9
z
H
G
ff
o
t
u
C
y
c
n
e
u
q
e
r
F
w
o
L
)
4
(
)
1
(
0
3
z
H
k
)
z
H
G
0
.
8
o
t
z
H
k
0
3
(
n
o
it
a
i
v
e
D
y
a
l
e
D
p
u
o
r
G
)
1
(
5
1
-
5
1
+
s
p
)
c
F
o
t
z
H
k
0
3
(
n
o
it
a
i
v
e
D
y
a
l
e
D
p
u
o
r
G
)
1
(
5
2
-
5
2
+
s
p
)
e
d
o
i
d
o
t
o
h
P
N
I
P
a
h
ti
w
(
y
ti
v
it
i
s
n
e
S
l
a
c
it
p
O
)
5
(
)
4
(
)
3
(
)
2
(
9
1
-
m
B
d
)
e
d
o
i
d
o
t
o
h
P
N
I
P
a
h
ti
w
(
d
a
o
lr
e
v
O
l
a
c
it
p
O
)
4
(
)
3
(
)
2
(
0
m
B
d
)
c
F
o
t
z
H
M
0
1
(
s
s
o
L
n
r
u
t
e
R
t
u
p
t
u
O
5
1
-
2
1
-
B
d
F
(
s
s
o
L
n
r
u
t
e
R
t
u
p
t
u
O
C
)
z
H
G
0
2
o
t
5
-
B
d
W
W
m
W
5
Advanced Product Information - Revision 0
03/01
ATA7602
10
100
1000
10000
0
50
100
150
200
250
300
350
400
Low Cutoff Frequency (kHz)
Re
quir
e
d Ce
x
t
(pF)
Figure 3: Calculated External Capacitor Size vs. Low Frequency Cutoff
0
2
4
6
8
10
12
14
16
18
20
freq, GHz
30
40
50
60
70
dB(Z(2,1))
Figure 4: Simulated Bandwidth
PDF 
ZIP
