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