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PDF ATA06212AD1C Data sheet ( Hoja de datos )
| Número de pieza | ATA06212AD1C | |
| Descripción | AGC TRANSIMPEDANCE AMPLIFIER | |
| Fabricantes | ANADIGICS Inc | |
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ATA06212AD1C
AGC Transimpedance Amplifier
Preliminary - Rev 1
FEATURES
• Single +5 Volt Supply
• Automatic Gain Control
• Excellent Sensitivity (- 34 dBm)
• 0 dBm Optical Overload
Vdd2
Vdd1
Vdd2
GND
GND
I in
GND
V out
GND
GND GND CBY CBY GND CAGC GND
APPLICATIONS
• SONET OC-12/SDH STM-4 Receiver
• Low Noise RF Amplifier
D1
Electrical Characteristics (1)
(TA= 25°C, VDD =+5.0V + 10%, CDIODE +CSTRAY = 0.7 pF, Detector Cathode to IIN)
PARAMETER
MIN TYP MAX UNIT
Transresistance(RL=¥ ,IDC < 500 nA)
Transresistance (RL=50 W ) (1)
Bandwidth - 3dB
7 11
3.5 5
400 425
kΩ
kΩ
MHz
Input Resistance (2)
300 Ω
Output Resistance
30 43 60 Ω
Input Offset Voltage
Output Offset Voltage
AGC Threshold (I ) (3)
IN
AGC Time Constant (6)
Optical Overload (4)
Optical Sensitivity (7)
Input Noise Current (RMS) (5)
Supply Current
Operating Voltage Range
Operating Temperature Range
1.0 1.3
Volts NOTES
1.0 1.4
40
(1) f = 50 MHz
Volts
(2) Measured with IIN below AGC Threshold.
µA During AGC, input impedance will decrease
4.2
0 +1
proportionally to IIN.
µsec (3) Defined as the IIN where Transresistance has
dBm decreased by 50%.
(4) See note on “Indirect Measurement of Optical
- 34 dBm Overload.”
40 50 nA (5) See note on “Input Referred Noise Current.”
30
45
mA
(6) CAGC = 56 pF
(7) Parameter is guaranteed (not tested) by
+ 4.5 + 5.0 + 5.5 Volts
design and characterization data @ 622 Mb/s,
assuming detector responsively of 0.95.
- 40 85 °C
1 page  
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.
5
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