ATA12001 データシートの表示（PDF） - ANADIGICS
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ATA12001 Datasheet PDF : 8 Pages
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AGC Capacitor
It is important to select an external AGC capacitor of
high quality and appropriate size. The ATA12001D1C
has an on-chip 70 KW resistor with a shunt 4.5 pF
capacitor to ground. Without external capacitance the
chip will provide an AGC time constant of 315 nS. For
the best performance in a typical OC-24 SONET
receiver, a minimum AGC capacitor of 56pF is
recommended. This will provide the minimum
amount of protection against pattern sensitivity and
pulse width distortion on repetitive data sequences
during high average optical power conditions.
Conservative design practices should be followed
when selecting an AGC capacitor, since unit to unit
variability of the internal time constant and various
data conditions can lead to data errors if the chosen
value is too small.
Phase Response
At frequencies below the 3dB bandwidth of the device,
the transimpedance phase response is
characteristic of a single pole transfer function (as
shown in the Phase vs Frequency curve). The output
impedance is essentially resistive up to 1200 MHz.
Phase (IIN to VOUT)
180
200
220
IIN
0.5pF
240
RF
VOUT
50 Ω
50
100
150
Frequency (MHz)
Figure 12: Phase (IIN to VOUT)
PRELIMINARY DATA SHEET - Rev 4
08/2001
ATA12001
7
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