General Description
The MAX3514/MAX3516/MAX3517 programmable-gain amplifiers are designed for use in CATV upstream applications. The MAX3514/MAX3517 drive up to +61dBmV (QPSK) into a 75Ω load when driven with a +34dBmV nominal input signal. The MAX3516 drives up to +64dBmV (QPSK). Both input and output ports are differential, requiring that an external balun be used at the output port. The variable gain feature provides greater than 56dB of dynamic range, which is controlled by an SPI™ 3-wire interface. Gain control is available in 0.5dB steps. The devices operate over a frequency range of 5MHz to 65MHz.

Features
♦ Accurate Gain Control
♦ Gain Programmable in 0.5dB Steps
♦ 56dB of Gain Control Range
♦ -55dBc Harmonic Distortion at 65MHz Input
♦ Low Burst On/Off Transient
♦ High Efficiency:
    35mA at +34dBmV Out
    8mA Transmit Disable Mode

Applications
    DOCSIS™/EuroDOCSIS™ and DVB Cable Modems
    OpenCable™ Set-Top Boxes
    Telephony-Over-Cable
    CATV Status Monitors