GENERAL DESCRIPTION
The AD8139 is an ultralow noise, high performance differential amplifier with rail-to-rail output. With its low noise, high SFDR, and wide bandwidth, it is an ideal choice for driving ADCs with resolutions to 18 bits. The AD8139 is easy to apply, and its internal common-mode feedback architecture allows its output common-mode voltage to be controlled by the voltage applied to one pin. The internal feedback loop also provides outstanding output balance as well as suppression of even-order harmonic distortion products. Fully differential and single-ended-to-differential gain configurations are easily realized by the AD8139. Simple external feedback networks consisting of a total of four resistors determine the amplifier’s closed-loop gain.

FEATURES
   Fully differential
   Low noise
      2.25 nV/√Hz
      2.1 pA/√Hz
   Low harmonic distortion
   98 dBc SFDR @ 1 MHz
   85 dBc SFDR @ 5 MHz
   72 dBc SFDR @ 20 MHz
   High speed
      410 MHz, 3 dB BW (G = 1)
      800 V/µs slew rate
      45 ns settling time to 0.01%
   69 dB output balance @ 1 MHz
   80 dB dc CMRR
   Low offset: ±0.5 mV max
   Low input offset current: 0.5 µA max
   Differential input and output
   Differential-to-differential or single-ended-to-differential
      operation
   Rail-to-rail output
   Adjustable output common-mode voltage
   Wide supply voltage range: 5 V to 12 V
   Available in small SOIC package

APPLICATIONS
   ADC drivers to 18 bits
   Single-ended-to-differential converters
   Differential filters
   Level shifters
   Differential PCB board drivers
   Differential cable drivers