ADA4940-1ARZ-R7

The ADA4940-1/ADA4940-2 are low noise, low distortion fully differential amplifiers with very low power consumption. They are an ideal choice for driving low power, high resolution, high performance SAR and Σ-Δ analog-to-digital converters (ADCs) with resolutions up to 16 bits from dc to 1 MHz on only 1.25 mA of quiescent current. The adjustable level of the output commonmode voltage allows the ADA4940-1/ADA4940-2 to match the input common-mode voltage of multiple ADCs. The internal common-mode feedback loop provides exceptional output balance, as well as suppression of even-order harmonic distortion products. With the ADA4940-1/ADA4940-2, differential gain configurations are easily realized with a simple external feedback network of four resistors determining the closed-loop gain of the amplifier. The ADA4940-1/ADA4940-2 achieve very low levels of distortion with an input voltage noise of only 3.9 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4940-1/ADA4940-2 make them well suited for a variety of data acquisition and signal processing applications.

Applications

• Low power PulSAR/SAR ADC drivers
• Single-ended-to-differential conversion
• Differential buffers
• Line drivers
• Medical imaging
• Industrial process controls
• Portable electronics

Key features

• Small signal bandwidth: 260 MHz
• Ultralow power 1.25 mA
• Extremely low harmonic distortion −122 dB THD at 50 kHz, −96 dB THD at 1 MHz
• Low input voltage noise: 3.9 nV/√Hz
• 0.35 mV maximum offset voltage
• Balanced outputs
• Settling time to 0.7%: 34 ns
• Rail-to-rail output: -V5 + 0.1 V to +Vs - 0.1 V
• Adjustable output common-mode voltage
• Flexible power supplies: 3 V to 7 V (LFCSP)
• Disable pin to reduce power consumption
• Available in LFCSP and SOIC packages