ADA4930-2 Ultralow Noise Drivers for Low Voltage ADCs

Product Details

The ADA4930-1/ADA4930-2 are very low noise, low distortion, high speed differential amplifiers. They are an ideal choice for driving 1.8 V high performance ADCs with resolutions up to 14 bits from dc to 70 MHz. The adjustable output common mode allows the ADA4930-1/ADA4930-2 to match the input of the ADC. The internal common-mode feedback loop provides exceptional output balance, suppression of even-order harmonic distortion products, and dc level translation.

With the ADA4930-1/ADA4930-2, differential gain configurations are easily realized with a simple external feedback network of four resistors determining the closed-loop gain of the amplifier.

The ADA4930-1/ADA4930-2 are fabricated using Analog Devices, Inc., proprietary silicon-germanium (SiGe), complementary bipolar process, enabling them to achieve very low levels of distortion with an input voltage noise of only 1.2 nV/√Hz.

The low dc offset and excellent dynamic performance of the ADA4930-1/ADA4930-2 make them well suited for a wide variety of data acquisition and signal processing applications.

The ADA4930-1 is available in a Pb-free, 3 mm × 3 mm 16-lead LFCSP, and the ADA4930-2 is available in a Pb-free, 4 mm × 4 mm 24-lead LFCSP. The pinout has been optimized to facilitate printed circuit board (PCB) layout and minimize distortion. The ADA4930-1 is specified to operate over the −40°C to +105°C temperature range, and the ADA4930-2 is specified to operate over the −40°C to +105°C temperature range for 3.3 V or 5 V supply voltages.


  • ADC drivers 
  • Single-ended-to-differential converters 
  • IF and baseband gain blocks 
  • Differential buffers 
  • Line drivers

Features and Benefits

  • Low input voltage noise: 1.2 nV/√Hz 
  • Low common-mode output: 0.9 V on single supply
  • Extremely low harmonic distortion
    • −104 dBc HD2 at 10 MHz 
    • −79 dBc HD2 at 70 MHz 
    • −73 dBc HD2 at 100 MHz 
    • −101 dBc HD3 at 10 MHz 
    • −82 dBc HD3 at 70 MHz 
    • −75 dBc HD3 at 100 MHz 
  • High speed
    • −3 dB bandwidth of 1.35 GHz, G = 1 
    • Slew rate: 3400 V/μs, 25% to 75% 
    • 0.1 dB gain flatness to 380 MHz 
    • Fast overdrive recovery of 1.5 ns
  • 0.5 mV typical offset voltage 
  • Externally adjustable gain 
  • Differential-to-differential or single-ended-to-differential operation
  • Adjustable output common-mode voltage 
  • Single-supply operation: 3.3 V or 5 V