Применения > > Ultralow Power, 18-Bit, Differential PulSAR ADC Driver

Ultralow Power, 18-Bit, Differential PulSAR ADC Driver (CN0237)

The circuit shown in Figure 1 uses the ultralow power AD7982 18-bit, 1 MSPS analog-to-digital converter (ADC) driven by the ADA4940-1, a low power fully differential amplifier. The ADR435 low noise precision 5.0 V voltage reference is used to supply the 5 V needed for the ADC. All the ICs shown in Figure 1 are available in small packages, either 3 mm × 3 mm LFCSP or 3 mm × 5 mm MSOP, which helps to reduce board cost and space.

Power dissipation of the ADA4940-1 in the circuit is typically 6.25 mW. The 18-bit, 1 MSPS AD7982 ADC consumes only 7 mW at 1 MSPS. This power also scales with the throughput. The ADR435 consumes only 4.7 mW, making the total power dissipated by the system less than 18 mW.

Figure 1. High Performance 18-Bit Differential ADC Driver (Simplified Schematic: All Connections and Decoupling Not Shown)


  • 18 bit ADC driver circuit
  • Conversions speeds up to 1 MSPS
  • System power disappation at 17 mW


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