(ACTIVE) 14-Bit 500kSPS Single-Supply SAR ADC Data Acquisition System With Programmable Bipolar Input Ranges


Functional diagram


The ADS8671 and ADS8675 devices belong to a family of integrated data acquisition system based on a successive approximation (SAR) analog-to-digital converter (ADC). The devices feature a high-speed, high-precision SAR ADC, integrated analog front-end (AFE) input driver circuit, overvoltage protection circuit up to ±20 V, and an on-chip 4.096-V reference with extremely low temperature drift.

The devices operate on a single 5-V analog supply, but support true bipolar input ranges of ±12.288 V, ±6.144 V, ±10.24 V, ±5.12 V, and ±2.56 V, as well as unipolar input ranges of 0 V to 12.288 V, 0 V to 10.24 V, 0 V to 6.144 V, and 0 V to 5.12 V. The gain and offset errors are accurately trimmed within the specified values for each input range to ensure high dc precision. The input range selection is done by software programming of the device internal registers. The devices offer a high resistive input impedance (≥ 1 MΩ) irrespective of the selected input range.

The multiSPI digital interface is backward-compatible to the traditional SPI protocol. Additionally, configurable features simplify interface to a wide range of host controllers.


  • 14-Bit ADC with Integrated Analog Front-End
  • High Speed:
    • ADS8671: 1 MSPS
    • ADS8675: 500 kSPS
  • Software Programmable Input Ranges:
    • Bipolar Ranges: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, and ±2.56 V
    • Unipolar Ranges: 0 V–12.288 V, 0 V–10.24 V, 0 V–6.144 V, and 0 V–5.12 V
  • 5-V Analog Supply: 1.65-V to 5-V I/O Supply
  • Constant Resistive Input Impedance ≥ 1 MΩ
  • Input Overvoltage Protection: Up to ±20 V
  • On-Chip, 4.096-V Reference with Low Drift
  • Excellent Performance:
    • DNL: ±0.25 LSB; INL: ±0.4 LSB
    • SNR: 84.5 dB; THD: –105 dB
  • ALARM → High, Low Thresholds per Channel
  • multiSPI™ Interface with Daisy-Chain
  • Extended Industrial Temperature Range:
    –40°C to +125°C


Resolution (Bits) 14   
# Input Channels 1   
Multi-Channel Configuration N/A   
Input Type Single-Ended   
Power Consumption (Typ) (mW) 27   
Input Range (Min) (V) -12.288   
Input Range (Max) (V) 12.288   
Interface SPI   
Features Oscillator^Over-Voltage Protection^PGA   
Analog Voltage AVDD (Min) (V) 4.75   
Analog Voltage AVDD (Max) (V) 5.25   
Architecture SAR   
Operating Temperature Range (C) -40 to 125   
Pin/Package 16TSSOP^16WQFN   
THD (Typ) (dB) -105   
SNR (dB) 84.5   
Reference Mode Ext^Int   

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