ATA06211
900
Bandwith (MHz)
800
700
600
500
400
300
0
0 .2
B(3dB) A
/ 2
π
Rf (C
in
+C
t
)
1.2
V
DD
= 5.5 V
V
DD
= 5.0 V
V
DD
= 4.5 V
0 .4
0 .6
0 .8
1 .0
1 .2
1 .4
1 .6
V
DD
= 5.5 V
1.0
0.9
0.8
V
DD
= 4.5 V
I
IN
50
0.7
0.6
0.5
C
T
(pF)
Figure 5: Bandwidth vs. CT
I
IN
Connection
(Refer to the equivalent circuit diagram.) Bonding the
detector cathode to I
IN
(and thus drawing current from
the ATA06211) improves the dynamic range. Although
the detector may be used in the reverse direction for
input currents not exceeding 25
mA,
the specifications
for optical overload will not be met.
2.1
- 1.6
- 1.1
I
IN
(mA DC)
- 0.6
- 0.1
Figure 7: Bandwidth vs. I
IN
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.
5
R
f
4
50
I
I
IN
3
2
Transimpedance (K Ohm)
V
DD
= 5.5 V
1
V
DD
= 4.5 V
heavy AGC
Output Collapse
V
DD
=5.5 V
Linear Region
-2.1
- 1.6
-1.1
- 0.6
- 0.1
R
f
I
IN
V
OUT
I
IN
(mA DC)
Figure 6: Transimpedance vs. I
IN
V
DD
=4.5 V
-4
-3
-2
-1
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
I
IN
(mA DC)
Figure 8: V
OUT
vs. I
IN
V
OUT
(Volts)
5
PRELIMINARY DATA SHEET - Rev 4
08/2001
BANDWIDTH (MHz)
1.1
ANADIGICS [ ANADIGICS, INC ]
