AD8324ACPZ

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1. DESCRIPTION

The AD8324ACPZ is a low cost amplifier designed for coaxial line driving. The features and specifications make the AD8324ACPZ ideally suited for DOCSIS® 2.0 and EuroDOCSIS applications. The gain of the AD8324ACPZ 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 AD8324ACPZ 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 AD8324ACPZ is packaged in a low cost, 20-lead LFCSP and a 20-lead QSOP. The AD8324 operates from a single 3.3 V supply. 

2. FEATURES

    1. Supports DOCSIS 2.0 and EuroDOCSIS specifications for reverse path transmission systems

    2. Gain programmable in 1 dB steps over a 59 dB range

    3. Low distortion at 61 dBmV output

        −59 dBc SFDR at 21 MHz

        −54 dBc SFDR at 65 MHz

    4. Output noise level at minimum gain 1.3 nV/√Hz

    5. 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

3. APPLICATIONS

    1. DOCSIS 2.0 and EuroDOCSIS cable modems

    2. CATV set-top boxes

    3. CATV telephony modems

    4. Coaxial and twisted pair line drivers