GENERAL DESCRIPTION

The AD8324 1 is a low cost amplifier designed for coaxial line driving. The features and specifications make the AD8324 ideally suited for DOCSIS 2.0 and Euro-DOCSIS applications. The gain of the AD8324 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 2.0 and Euro-DOCSIS standards for reverse path transmission systems

Gain programmable in 1 dB steps over a 59 dB range

Low distortion at 61 dBmV output:

–59 dBc SFDR at 21 MHz

–54 dBc SFDR at 65 MHz

Output noise level @ minimum gain 1.3 nV/√Hz

Maintains 75 Ω output impedance in TX-enable and Transmit-disable condition

Upper bandwidth: 100 MHz (full gain range)

3.3 V supply operation

Supports SPI® interfaces

APPLICATIONS

DOCSIS 2.0 and Euro-DOCSIS cable modems

CATV set-top boxes

CATV telephony modems

Coaxial and twisted pair line drivers