AD8139 Low Noise, Rail-to-Rail, Differential ADC Driver

Product Details

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 analog-to-digital converters (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 four resistors determine the closed-loop gain of the amplifier.

The AD8139 is manufactured on the proprietary Analog Devices, Inc., second-generation XFCB process, enabling it to achieve low levels of distortion with input voltage noise of only 2.25 nV/√Hz.

The AD8139 is available in an 8-lead SOIC package with an exposed paddle (EP) on the underside of its body and a 3 mm × 3 mm LFCSP. It is rated to operate over the temperature range of −40°C to +125°C.

Applications

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

Features and Benefits

  • Fully differential
  • Low noise
    • 2.25 nV/√Hz
    • 2.1 pA/√Hz
  • Low harmonic distortion
    • 98 dBc SFDR at 1 MHz
    • 85 dBc SFDR at 5 MHz
    • 72 dBc SFDR at 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 at 1 MHz
  • 80 dB dc CMRR
  • Low offset: ±0.5 mV maximum
  • Low input offset current: 0.5 µA maximum
  • 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 a small SOIC package and an 8-lead LFCSP