ATA06212AD1C(Rev1) データシートの表示（PDF） - ANADIGICS
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ATA06212AD1C Datasheet PDF : 8 Pages
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ATA06212AD1C
INDIRECT MEASUREMENT OF OPTICAL OVERLOAD
Optical overload can be defined as the maximum optical power above which the BER (bit error rate)
increases beyond 1 error in 1010 bits. The ATA06212AD1C is 100% tested at die sort by an AC
measurement which has excellent correlation with a PRBS optical overload measurement.
INPUT REFERRED NOISE CURRENT
The “Input Noise Current”is directly related to sensitivity . It can be defined as the output noise
voltage (V ) with no input signal, (including a 400 MHz lowpass filter at the output of the TIA) divided
OUT
by the AC transresistance.
AGC CAPACITOR
It is important to select an external AGC capacitor of high quality and appropriate size. The
ATA06212AD1C has an on-chip 70 kΩ 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 622Mb/s 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. The AGC function can be
disabled by bonding C to ground. Conservative design practices should be followed when selecting
AGC
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.
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