ATA01501S2C データシートの表示（PDF） - ANADIGICS

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ATA01501S2C

AGC Transimpedance Amplifier

ANADIGICS 

ATA01501

AGC Capacitor

It is important to select an external AGC capacitor of

high quality and appropriate size. The ATA00501D1C

has an on-chip 70 KW resistor with a shunt 4 pF

capacitor to ground. Without external capacitance the

chip will provide an AGC time constant of 280 nS. For

the best performance in a typical 51MB/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. 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 1000 MHz.

180

200

220

IIN

240 0.5pF

VOUT

00501

50

100

150

Frequency (MHz)

Figure 14: Phase (IIN to VOUT)

8

PRELIMINARY DATA SHEET - Rev 1.6

08/2001

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