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AD8324:  3.3 V UPSTREAM CABLE LINE DRIVER

The AD83241 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 ...More

AD8324:  3.3 V UPSTREAM CABLE LINE DRIVER

Product Description

The AD83241 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 W 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 package and a 20-lead QSOP package. The AD8324 operates from a single 3.3 V supply.

1Patent Pending.

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EVALUATION BOARDS & DEVELOPMENT KITS

  • 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
  • Application: Cable
  • Function: CATV Line Driver
  • Voltage Supply (V): 3.3
  • -3 dB BW (MHz): 100MHz
  • Distortion (dBc): -59dBc
  • Spectral Noise (nV/rtHz): 157nV/rtHz
  • Gain (dB): 59dB
  • Gain Low End (dB): -25.5dB
  • Gain High End (dB): +33.5dB
  • Package: 20-Lead LFCSP,20-Lead QSOP

Functional Block Diagram for AD8324

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*The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.