General Description

The MAX3507 is a variable-gain power amplifier for use in CATV upstream transmitters. The variable-gain feature has 55dB of dynamic range and is controlled by a 3-wire SPI™ bus. The device is capable of generating +64dBmV output (16QAM/QPSK) when driven with a +34dBmV nominal input signal. The on-chip anti-alias lowpass filter with 75MHz cutoff frequency saves system design cost and space. The optional positive slope generator provides system design flexibility.

Features

♦ Built-In 5th-Order Elliptic Anti-Aliasing Filter

♦ 5MHz to 65MHz Operation

♦ 55dB Gain Control Range

♦ Optional Positive Slope Generator

♦ 55dB Spurious-Free Dynamic Range Over

Transmit Band

Applications

Cable Modem Upstream Transmitter

Set-Top Box Upstream Transmitter

Telephony Over Cable