ATA01502
150
Bandwith (MHz)
140
130
120
110
100
90
0
2500
V
DD
= 5.5 V
V
DD
= 5.5 V
V
DD
= 5.0 V
V
DD
=4.5 V
R
F
900
V
DD
= 4.5 V
0 .2
0 .4
0 .6
0 .8
1 .0
1 .2
1 .4
1 .6
I
IN
1502
50
Ω
120
- 2.2
- 1.7
- 1.2
- 0.7
- 0.2
C
T
(pF)
Figure 5: Bandwidth vs. CT
Note: All performance curves are typical @ TA =25
°C
unless otherwise noted.
I
IN
(mA DC)
Figure 7: Bandwidth vs. I
IN
I
IN
Connection
(Refer to the equivalent circuit diagram) Bonding the
detector cathode to I
IN
(and thus drawing current from
the ATA01502D1C) improves the dynamic range. The
detector may be used in the reverse direction for input
currents not exceeding 13
mA,
however the
specifications for optical overload will not be met.
13.0
R
F
11.0
9.0
50
Ω
Transimpedance (K Ohm)
15.0
V
OUT
Connection
The output pad should be connected via a coupling
capacitor to the next stage of the receiver channel
(filter or decision circuits), as the output buffers are
not designed to drive a DC coupled 50 ohm load
(this would require an output bias current of
approximately 36 mA to maintain a quiescent 1.8
Volts across the output load). If V
OUT
is connected to a
high input impedance decision circuit (>500 ohms),
then a coupling capacitor may not be required,
although caution should be exercised since DC
offsets of the photo detector/TIA combination may
cause clipping of subsequent gain or decision
circuits.
3.4
3.2
3.0
2.9
2.7
2.5
2.4
2.2
2.0
1.9
1.7
1.5
1.4
1.2
1.0
0.8
0.7
0.5
0.3
0.2
0.0
heavy AGC
Output Collapse
V
DD
=5.5 V
Linear Region
R
F
I
5.0
V
DD
= 5.5 V
V
DD
= 4.5 V
-2.2
- 1.7
-1.2
- 0.7
I
IN
(mA DC)
- 0.2
3.0
1.0
0.0
I
IN
V
DD
=4.5 V
- 5
- 4
- 3
1502
V
OUT
Figure 6: Transimpedance vs. I
IN
- 2
I
IN
(mA DC)
Figure 8: V
OUT
vs. I
IN
V
OUT
(Volts)
I
IN
7.0
PRELIMINARY DATA SHEET - Rev 2
08/2001
Bandwidth (MHz)
5
B(3dB)
~
A
/ 2
π
R
F
(C
IN
+C
T
)
ANADIGICS [ ANADIGICS, INC ]
