ATA121302 Datasheet, PDF (1/8 Pages) ANADIGICS, Inc – 1.25Gb/s Transimpedance Amplifier

FEATURES
· 1.25 Gb/s Differential Output TIA
· Automatic Gain Control
· Single +5V Supply
· 1100 MHz Bandwidth
· -28 dBm typical sensitivity
· On-Chip PIN Photodiode Bias Voltage
APPLICATIONS
· Gigabit Ethernet (1.250 Gb/s)
· Fibre Channel (1.0625 Gb/s)
ATA121302
1.25Gb/s Transimpedance Amplifier
ADVANCED PRODUCT INFORMATION - Rev 0.1
D1C
PRODUCT DESCRIPTION
The ANADIGICS ATA121302 is a +5V low noise
transimpedance amplifier designed to be used in
Gigabit Ethernet and Fiber Channel fiber optic links.
The device is used in conjunction with a
photodetector (PIN diode or avalanche photodiode)
to convert an optical signal into a differential output
V_DD
voltage. The ATA121302 offers a bandwidth of
1100MHz, a dynamic range in excess of 28dB and
an on-chip bias voltage for PIN photodetectors. It is
manufactured in a GaAs MESFET process and is
available in bare die form.
4K
I_IN
V_OUT
V_OUT
AGC
US Patent: 5047728, 5602510
Charge
6.5 GHz
V_N
Pump
Osc
US Patent Pending
GND
The photodetector cathode must be connected to I_IN
and the anode can be connected to V_N or ground for
proper AGC operation.
Figure 1: ATA121302 Equivalent Circuit
08/2001
2-1