Electrical Equipment & Supplies > Batteries >  Gain Programmable CATV Line Driver

Gain Programmable CATV Line Driver

Place of Origin:
United States
Brand Name:
Model Number:
Drive IC
Supply Voltage:
Dissipation Power:
Gain Programmable CATV Line Driver
Detailed Description

Type:Line Driver
1.Low Cost
2.Very Low Output Noise Level
3.Power-Down Functionality

Line Driver Description

The AD8321 is a low cost digitally controlled variable gain
amplifier optimized for coaxial line driving applications such as
cable modems that are designed to the DOCSIS* (upstream)

standard. An 8-bit serial word determines the desired output gain
over a 53.4 dB range, resulting in gain changes of 0.75 dB/LSB.
The AD8321 comprises a digitally controlled variable attenuator
of 0 dB to –53.4 dB, which is preceded by a low noise, fixed
gain buffer and followed by a low distortion high power ampli­
fier. The AD8321 accepts a differential or single-ended input
signal. The output is specified for driving a 75 W load, such as
coaxial cable, although the AD8321 is capable of driving other
loads. Performance of –53 dBc is achieved with an output level
up to 11 dBm at 42 MHz bandwidth using a 9 V supply.
A key performance and cost advantage of the AD8321 results
from the ability to maintain a constant 75 W output impedance
during power-up and power-down conditions. This eliminates
the need for external 75 W termination, resulting in twice the
effective output voltage when compared to a standard opera­
tional amplifier, thus eliminating the need for a transformer.
*Data-Over-Cable Service Interface Specifications

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