General Description

The MAX3509 is a programmable power amplifier for use in CATV upstream applications. The device outputs up to 66dBmV QPSK through a 1:1 transformer. It features variable gain controlled by a 3-wire digital serial bus. Gain control is available in 1dB steps. The device operates over a 5MHz to 65MHz frequency range.

Features

♦ Ultra-Low Power-Up/Down Transients,

25mV (typ) at 66dBmV Output

♦ Single-Supply Operation

♦ Output Level Ranges from <12dBmV to 67dBmV

(QPSK)

♦ Gain Programmable in 1dB Steps

♦ Low Transmit Output Noise Floor: -41dBmV

(160kHz BW)

♦ Low Transmit-Disable Output Noise: -70dBmV

♦ Shutdown Mode

Applications

Telephony-Over-Cable

CATV Status Monitors

OPENCATV Set-Top Boxes

CATV Infrastructures

Cable Modems