3.3 V DOCSIS 2.0 Upstream Cable Line Driver

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
  • Supports DOCSIS 2.0 and EuroDOCSIS specifications 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 at minimum gain 1.3 nV/√Hz
  • Maintains 75 Ω output impedance in transmit-enable and transmit-disable condition
  • Upper bandwidth of 100 MHz (full gain range)
  • 3.3 V supply operation
  • Supports SPI® interfaces
Additional Details
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The AD8324 is a low cost amplifier designed for coaxial line driving. The features and specifications make the AD8324 ideally suited for DOCSIS® 2.0 and EuroDOCSIS 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.

The AD8324 accepts a differential or single-ended input signal. The output is specified for driving a 75 Ω load through a 1:1 transformer.

Distortion performance of –54 dBc is achieved with an output level up to 61 dBmV at 65 MHz bandwidth. This device has a sleep mode function that reduces the quiescent current to 30 μA and a full power-down function that reduces power-down current to 2.5 mA.

The AD8324 is packaged in a low cost, 20-lead LFCSP and a 20-lead QSOP. The AD8324 operates from a single 3.3 V supply.


  • DOCSIS 2.0 and EuroDOCSIS cable modems
  • CATV set-top boxes
  • CATV telephony modems
  • Coaxial and twisted pair line drivers

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