ATA121302
ADVANCED PRODUCT INFORMATION - Rev 0.1
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
1.25Gb/s Transimpedance Amplifier
APPLICATIONS
·
·
Gigabit Ethernet (1.250 Gb/s)
Fibre Channel (1.0625 Gb/s)
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
V
N
Charge
Pump
6.5 GHz
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
ANADIGICS [ ANADIGICS, INC ]
