AD7091 SAR Analog-to-Digital Converter

By Analog Devices Inc 101

AD7091 SAR Analog-to-Digital Converter

ADI's AD7091 is a 12-bit successive approximation register analog-to-digital converter (SAR ADC) that offers ultra-low power consumption (typically 367 μA at 3 V and 1 MSPS) while achieving fast throughput rates (1 MSPS with a 50 MHz SCLK). The AD7091 operates from a single 2.09 V to 5.25 V power supply. The AD7091 also features an on-chip conversion clock and a high-speed serial interface.

The conversion process and data acquisition are controlled using a CONVST signal and an internal oscillator. The AD7091 has a serial interface that allows data to be read after the conversion while achieving a 1 MSPS throughput rate. The AD7091 uses advanced design and process techniques to achieve very-low power dissipation at high-throughput rates.

The reference is derived internally from VDD. This design allows the widest dynamic input range to the ADC; that is, the analog input range for the AD7091 is from 0 V to VDD. The AD7091 comes in a 8 pin LFCSP package and has an operating temperature range of -40°C to +125°C. It was designed for battery powered systems found in mobile, meters, and test equipment.

  • Ultralow power
    • 367 µA typical at 3 V and 1 MSPS
    • 324 nA typical at 3 V in power-down mode
  • Throughput rate: 1 MSPS
  • Specified for VDD of 2.09 V to 5.25 V
  • INL of ±1 LSB maximum
  • Analog input range of 0 V to VDD
  • Reference provided by VDD
  • Flexible power/throughput rate management
  • High speed serial interface: SPI®-/QSPI™-/MICROWIRE™-/DSP-compatible
  • Busy indicator
  • Power-down mode
  • 8-lead, 2 mm × 2 mm LFCSP package
  • Temperature range: -40°C to +125°C
  • Instrumentation and control systems
  • Data acquisition systems
  • Optical sensors
  • Diagnostic/monitoring functions
  • Energy harvesting
  • Battery-powered systems
    • Handheld meters
    • Medical instruments
    • Mobile communications