ADS8912B - 18-Bit, 500KSPS, SAR ADC With Internal Reference Buffer, Internal LDO, and multiSPI™ Interface

The ADS8910B, ADS8912B, and ADS8914B (ADS891xB) belong to a family ofpin-to-pin compatible, high-speed, single-channel, high-precision, 18-bit successive approximationregister (SAR) analog-to-digital convertors (ADCs) with an integrated reference buffer andintegrated low-dropout regulator (LDO). The device family includes the ADS890xB (20-bit) andADS892xB (16-bit) resolution variants.

The ADS891xB boost analog performancewhile maintaining high-resolution data transfer by using TI’s enhanced-SPI feature. Enhanced-SPIenables the ADS89xxB to achieve high throughput at lower clock speeds, thereby simplifying theboard layout and lowering system cost. Enhanced-SPI also simplifies clocking-in of data, therebymaking this device an excellent choice for applications involving FPGAs, DSPs. The ADS89xxB iscompatible with a standard SPI Interface.

The ADS891xB has an internal data parityfeature that can be appended to the ADC data output. ADC data validation by the host, using paritybits, improves system reliability.

• Resolution: 18-Bits
• High Sample Rate With No Latency Output:
  • ADS8910B: 1-MSPS
  • ADS8912B: 500-kSPS
  • ADS8914B: 250-kSPS
• Integrated LDO Enables Single-Supply Operation
• Low-Power Reference Buffer With No Droop
• Excellent AC and DC Performance:
  • SNR: 102.5-dB, THD: –125-dB
  • INL: ±0.5-LSB
  • DNL: ±0.2-LSB, 18-Bit No-Missing-Codes
• Wide Input Range:
  • Unipolar Differential Input Range: ±V_REF
  • V_REF Input Range: 2.5-V to 5-V
• Single-Supply, Low-Power Operation
  (Includes Internal Reference Buffer and LDO)
  • ADS8910B : 21-mW at 1-MSPS
  • ADS8912B : 16-mW at 500-kSPS
  • ADS8914B : 14-mW at 250-kSPS
• Enhanced-SPI Digital Interface
  • Interface SCLK: 20-MHz at 1-MSPS
  • Configurable Data Parity Output
• Extended Temperature Range: –40°C to +125°C
• Small Footprint: 4-mm × 4-mm VQFN

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