6500V/µs, Wideband, High-Output-Current, Single-Ended-to-Differential Line Drivers with Enable

 

Part Number	Replacement	Explanation

Description

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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.

MAX4447, MAX4448, MAX4449: Typical Operating Circuit Enlarge+

Key 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 per root-Hz at f_IN = 1MHz
• 8ns Settling Time to 0.1%

Applications/Uses

• Coaxial to Twisted-Pair Converter
• Differential ADC Driver
• Differential Line Driver
• Differential Pulse Amplifier
• High-Speed Differential Transmitter
• Single-Ended-to-Differential Conversion
• Video and RF Signal Processing and Transmission
• xDSL Applications