TI ADS8881CDGSR

The ADS8881 is an 18-bit, 1MSPS, true differential-input analog-to-digital converter (ADC). This device operates with an external reference voltage ranging from 2.5V to 5V, providing a wide signal range without the need for additional signal conditioning. The reference voltage setting is independent of and can exceed the analog supply voltage (AVDD). The device provides a compatible SPI serial interface. This serial interface also supports daisy-chain operation for cascading multiple devices. An optional busy indicator bit facilitates easy synchronization with the digital host. The device supports unipolar true differential analog input signals with a differential input swing from -VREF to VREF. This true differential analog input structure allows the common-mode voltage to take any value within the range of 0V to VREF (when both inputs are within the input operating voltage range of -0.1V to VREF + 0.1V). The device operation is optimized for extremely low power consumption. The power consumption is directly proportional to the speed. This characteristic makes the ADS8881 well-suited for low-speed applications.

• Sample rate: 1MHz
• No latency output
• Unipolar, true differential input range: –VREF to +VREF
• Wide common-mode voltage range: 0V to VREF (CMRR minimum 90dB)
• SPI-compatible serial interface with daisy-chain option
• Excellent AC and DC performance:
  • ADS8881C:
    • INL: ±1 LSB (typical), ±2.0 LSB (maximum)
    • DNL: ±1.0 LSB (maximum), 18-bit NMC
    • SNR: 100dB, THD: –115dB
  • ADS8881I:
    • INL: ±1.5 LSB (typical), ±3.0 LSB (maximum)
    • DNL: ±1.5 and –1 LSB (maximum), 18-bit NMC
    • SNR: 100dB, THD: –115dB
• Wide operating voltage range:
  • AVDD: 2.7V to 3.6V
  • DVDD: 2.7V to 3.6V (independent of AVDD)
  • REF: 2.5V to 5V (independent of AVDD)
• Operating temperature:
  • ADS8881C: 0°C to +70°C
  • ADS8881I: –40°C to +85°C
• Low power dissipation:
  • 5.5mW at 1MSPS
  • 0.55mW at 100kSPS
  • 55μW at 10kSPS
• Power-down current (AVDD): 50nA
• Full-scale step settled to 18 bits: 290ns
• Package: MSOP-10 and VSON-10

• Automatic Test Equipment (ATE)
• Instrumentation and handler cards
• Precision medical equipment
• Low-power, battery-powered instruments