AGC Transimpedance Amplifier
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AGC Transimpedance Amplifier SONET OC-24
FEATURES
· · · · · Single +5 Volt Supply Automatic Gain Co...
Description
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AGC Transimpedance Amplifier SONET OC-24
FEATURES
· · · · · Single +5 Volt Supply Automatic Gain Control -31 dBm Sensitivity 0 dBm Optical Overload 1100 MHz Bandwidth
925 um
VDD1
ATA12001
PRELIMINARY DATA SHEET-Rev 4
VDD2
GND GND
1992
4E IIN
APPLICATIONS
· · · · SONET OC-24 (1 Gb/s) Receiver Low Noise RF Amplifier
GND GND GND GND CBY CBY GND CAGC
VOUT GND
BISDN
HIPPI
1250 um
D1C
PRODUCT DESCRIPTION
The ANADIGICS ATA12001 is a 5V low noise transimpedance amplifier with AGC designed to be used in 1Gb/s fiber optic links. The device is used in conjunction with a photodetector (PIN diode or avalanche photodiode) to convert an optical signal into an output voltage. The ATA12001 offers a bandwidth of 1100MHz and a dynamic range of 31dB. It is manufactured in a GaAs MESFET process and is available in bare die form.
VDD1
AGC
4K 70K
VDD2
CAGC
GND or neg. Supply
IIN
- 35
VGA
4pF + 0.8
VOUT
GND
PATENT PENDING
BY Photodetector Cathode must be connected to IIN for proper AGC operation
C
Figure 1: Equivalent Circuit
08/2001
ATA12001
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VDD2
VDD1
GND GND
1992
925 um
4E IIN GND GND GND GND CBY CBY
VOUT GND CAGC GND
1250 um
Figure 2: Bonding Pad Layout Table 1: ATA12001 Pad Description
PAD V DD1 V DD2 IIN VOUT C AGC C BY D ESC R IPTION V DD1 V DD2 TIA Input C urrent TIA Output Voltage External AGC C apaci tor Input Gai n Stage Bypass C apaci tor C OMMEN T Posi ti ve supply for i nput gai n stage Posi ti ve supply for second gai ...
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