General Description

The MAX4447/MAX4448/MAX4449 single-ended-to differential line drivers are designed for high-speed communications. Using current feedback for greater bandwidth, these devices deliver full-power bandwidths up to 405MHz and feature slew rates as high as 6500V/µs. The MAX4447 has a fixed gain of +2V/V and a small-signal bandwidth of 430MHz. The MAX4448/MAX4449 have small-signal bandwidths of 330MHz and 400MHz, respectively, and are internally compensated for minimum gain configurations of +2V/V and +5V/V, respectively. For greater design flexibility, the MAX4448/MAX4449 allow for variable gain selection using external gain-setting resistors. A low-power enable mode reduces current consumption below 5.5mA and places the outputs in a high-impedance state.

The MAX4447/MAX4448/MAX4449 can deliver differential output swings of ±6.2V from ±5V supplies with a 50Ω load. Excellent differential gain/phase and noise specifications make these amplifiers ideal for a wide variety of video and RF signal-processing and transmission applications.

Features

♦ 6500V/µs Slew Rate (MAX4449)

♦ Small-Signal Bandwidth

   430MHz (MAX4447)

   330MHz (MAX4448)

   400MHz (MAX4449)

♦ 200MHz 0.1dB Gain Flatness (MAX4447)

♦ 130mA Output Drive Current

♦ +2V/V Internally Fixed Gain (MAX4447)

♦ External Gain Selection

   ≥+2V/V (MAX4448)

   ≥+5V/V (MAX4449)

♦ -78dB SFDR at 100kHz

♦ Low Differential Gain/Phase: 0.01%/0.02°

♦ Ultra-Low Noise: 23nV/√Hz at fIN = 1MHz

♦ 8ns Settling Time to 0.1%

Applications

  Differential Line Driver

  Single-Ended-to-Differential Conversion

  High-Speed Differential Transmitter

  Coaxial to Twisted-Pair Converter

  Differential Pulse Amplifier

  Differential ADC Driver

  xDSL Applications

  Video and RF Signal Processing and Transmission