GENERAL DESCRIPTION

The AD8328 is a low cost amplifier designed for coaxial line driving. The features and specifications make the AD8328 ideally suited for MCNS-DOCSIS and EuroDOCSIS applications. The gain of the AD8328 is digitally controlled. An 8-bit serial word determines the desired output gain over a 59 dB range, resulting in gain changes of 1 dB/LSB.

FEATURES

Supports DOCSIS and EuroDOCSIS standards for reverse

path transmission systems

Gain programmable in 1 dB steps over a 59 dB range

Low distortion at 60 dBmV output

−57.5 dBc SFDR at 21 MHz

−54 dBc SFDR at 65 MHz

Output noise level @ minimum gain 1.2 nV/√Hz

Maintains 300 Ω output impedance Tx-enable and

Tx-disable condition

Upper bandwidth: 107 MHz (full gain range)

5 V supply operation

Supports SPI interfaces

APPLICATIONS

DOCSIS and EuroDOCSIS cable modems

CATV set-top boxes

CATV telephony modems

Coaxial and twisted pair line drivers