18-Bit, 400-kSPS, 1-Ch SAR ADC with True-Differential Input, SPI Interface and Daisy-Chain


Product details


Resolution (Bits) 18 Number of input channels 1 Sample rate (Max) (kSPS) 400 Interface type SPI Architecture SAR Input type Differential Multi-channel configuration Rating Catalog Reference mode Ext Input range (Max) (V) 5 Input range (Min) (V) -5 Features Daisy-Chainable, Oscillator, Small Size Operating temperature range (C) -40 to 85 Power consumption (Typ) (mW) 2.6 Analog voltage AVDD (Min) (V) 2.7 SNR (dB) 100 Analog voltage AVDD (Max) (V) 3.6 INL (Max) (+/-LSB) 3 Digital supply (Min) (V) 1.65 Digital supply (Max) (V) 3.6 open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

VSON (DRC) 10 9 mm² 3 x 3 VSSOP (DGS) 10 9 mm² 3 x 3 open-in-new Find other Precision ADCs (<=10MSPS)


  • Sample Rate: 400 kHz
  • No Latency Output
  • Unipolar, True-Differential Input Range:
    –VREF to +VREF
  • Wide Common-Mode Voltage Range:
    0 V to VREF with 90-dB CMRR (min)
  • SPI™-Compatible Serial Interface with
    Daisy-Chain Option
  • Excellent AC and DC Performance:
    • SNR: 100 dB, THD: –115 dB
    • INL: ±1.5 LSB (typ), ±3.0 LSB (max)
    • DNL: +1.5 and –1 LSB (max), 18-Bit NMC
  • Wide Operating Range:
    • AVDD: 2.7 V to 3.6 V
    • DVDD: 1.65 V to 3.6 V
      (Independent of AVDD)
    • REF: 2.5 V to 5 V (Independent of AVDD)
    • Operating Temperature: –40°C to +85°C
  • Low-Power Dissipation:
    • 2.6 mW at 400 kSPS
    • 0.65 mW at 100 kSPS
    • 65 µW at 10 kSPS
  • Power-Down Current (AVDD): 50 nA
  • Full-Scale Step Settling to 18 Bits: 1200 ns
  • Packages: MSOP-10 and SON-10
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The ADS8885 is an 18-bit, 400-kSPS, true-differential input, analog-to-digital converter (ADC). The device operates with a 2.5-V to 5-V external reference, offering a wide selection of signal ranges without additional input signal scaling. The reference voltage setting is independent of, and can exceed, the analog supply voltage (AVDD).

The device offers an SPI-compatible serial interface that also supports daisy-chain operation for cascading multiple devices. An optional busy-indicator bit makes synchronizing with the digital host easy.

The device supports unipolar, true-differential analog input signals with a differential input swing of –VREF to +VREF. This true-differential analog input structure allows for a common-mode voltage of any value in the range of 0 V to +VREF (when both inputs are within the operating input range of –0.1 V to VREF + 0.1 V).

Device operation is optimized for very low-power operation. Power consumption directly scales with speed. This feature makes the ADS8885 excellent for lower-speed applications.

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Technical documentation

= Featured
No results found. Please clear your search and try again. View all 4
Type Title Date
* Datasheet 18-Bit, 400-kSPS, Serial Interface, microPower, Miniature, True-Differential Inp datasheet (Rev. A) Dec. 17, 2013
Application notes Circuit for protecting low-voltage SAR ADC from electrical overstress with minim May 25, 2019
White papers Voltage-reference impact on total harmonic distortion Aug. 01, 2016
White papers Best of Baker's Best: Precision Data Converters -- SAR ADCs May 21, 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SBAM172.ZIP (35 KB) - IBIS Model
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Analog engineer's calculator
ANALOG-ENGINEER-CALC — The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
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    • Gain selections using standard resistors
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Reference designs

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CAD/CAE symbols

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VSON (DRC) 10 View options
VSSOP (DGS) 10 View options

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