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ADS9817

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Eight-channel, 18-bit, 8-MSPS dual simultaneous-sampling ADC with integrated analog front end

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ADS9817

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Product details

Resolution (Bits) 18 Number of input channels 8 Sample rate (Max) (kSPS) 8000 Interface type SPI, Serial Architecture SAR Rating Catalog Input range (Max) (V) 12 Input range (Min) (V) -12 Features Over-Voltage Protection, PGA Operating temperature range (C) -40 to 125 Power consumption (Typ) (mW) 220 Analog voltage AVDD (Min) (V) 4.75 SNR (dB) 92.3 Analog voltage AVDD (Max) (V) 5.25 INL (Max) (+/-LSB) 2.5 Digital supply (Min) (V) 1.75 Digital supply (Max) (V) 1.85
Resolution (Bits) 18 Number of input channels 8 Sample rate (Max) (kSPS) 8000 Interface type SPI, Serial Architecture SAR Rating Catalog Input range (Max) (V) 12 Input range (Min) (V) -12 Features Over-Voltage Protection, PGA Operating temperature range (C) -40 to 125 Power consumption (Typ) (mW) 220 Analog voltage AVDD (Min) (V) 4.75 SNR (dB) 92.3 Analog voltage AVDD (Max) (V) 5.25 INL (Max) (+/-LSB) 2.5 Digital supply (Min) (V) 1.75 Digital supply (Max) (V) 1.85
VQFN (RSH) 56 49 mm² 7 x 7
  • 8-channel, 18-bit ADC with analog front-end:
    • Dual, simultaneous sampling: 4 × 1 channels
    • Constant 1-MΩ input impedance front-end
  • Programmable low-pass filter bandwidth:
    • 21 kHz and 400 kHz
  • Programmable input ranges:
    • ±12 V, ±10 V, ±7 V, ±5 V, ±3.5 V, and ±2.5 V
    • Single-ended and differential inputs
  • Input overvoltage protection: Up to ±18 V
  • Integrated low-drift 4.096-V precision reference
  • Excellent performance:
    • DNL: ±0.3 LSB, INL: ±1.5 LSB
    • SNR: 92.2 dB, THD: –112 dB
  • Power supply:
    • Analog and digital: 5 V and 1.8 V
    • Digital interface: 1.2 V to 1.8 V
  • Temperature range: –40°C to +125°C
  • 8-channel, 18-bit ADC with analog front-end:
    • Dual, simultaneous sampling: 4 × 1 channels
    • Constant 1-MΩ input impedance front-end
  • Programmable low-pass filter bandwidth:
    • 21 kHz and 400 kHz
  • Programmable input ranges:
    • ±12 V, ±10 V, ±7 V, ±5 V, ±3.5 V, and ±2.5 V
    • Single-ended and differential inputs
  • Input overvoltage protection: Up to ±18 V
  • Integrated low-drift 4.096-V precision reference
  • Excellent performance:
    • DNL: ±0.3 LSB, INL: ±1.5 LSB
    • SNR: 92.2 dB, THD: –112 dB
  • Power supply:
    • Analog and digital: 5 V and 1.8 V
    • Digital interface: 1.2 V to 1.8 V
  • Temperature range: –40°C to +125°C

The ADS981x is an eight-channel data acquisition (DAQ) system based on a dual, simultaneous-sampling, 18-bit successive approximation register (SAR) analog-to-digital converter (ADC). The ADS981x features a complete analog front-end for each channel with an input clamp, 1-MΩ input impedance, independently programmable gain amplifier (PGA), programmable low-pass filter, and an ADC input driver. The device also features a low-drift, precision reference with a buffer to drive the ADCs. A high-speed digital interface supporting 1.2-V to 1.8-V operation enables the ADS981x to be used with a variety of host controllers.

The ADS981x can be configured to accept ±12-V, ±10-V, ±7-V, ±5-V, ±3.5-V, and ±2.5-V bipolar inputs. The high input impedance allows direct connection with sensors and transformers, thus eliminating the need for external driver circuits. The high performance and accuracy, along with zero-latency conversions offered by this device make the ADS981x a great choice for multiple industrial applications.

The ADS981x is an eight-channel data acquisition (DAQ) system based on a dual, simultaneous-sampling, 18-bit successive approximation register (SAR) analog-to-digital converter (ADC). The ADS981x features a complete analog front-end for each channel with an input clamp, 1-MΩ input impedance, independently programmable gain amplifier (PGA), programmable low-pass filter, and an ADC input driver. The device also features a low-drift, precision reference with a buffer to drive the ADCs. A high-speed digital interface supporting 1.2-V to 1.8-V operation enables the ADS981x to be used with a variety of host controllers.

The ADS981x can be configured to accept ±12-V, ±10-V, ±7-V, ±5-V, ±3.5-V, and ±2.5-V bipolar inputs. The high input impedance allows direct connection with sensors and transformers, thus eliminating the need for external driver circuits. The high performance and accuracy, along with zero-latency conversions offered by this device make the ADS981x a great choice for multiple industrial applications.
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Technical documentation

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Type Title Date
* Data sheet ADS981x 18-Bit, 8-MSPS, Dual, Simultaneous-Sampling ADC WithIntegrated Analog Front-End datasheet PDF | HTML 11 Jan 2023
Certificate ADS9817EVM-PDK EU RoHS Declaration of Conformity (DoC) 11 Jan 2023
Technical article Balancing ADC size, power, resolution and bandwidth in precision data-acquisition systems 03 Dec 2021
Technical article Four ways to improve your ADC system power supply rejection 25 Jun 2015
Technical article Leverage coherent sampling and FFT windows when evaluating SAR ADCs (Part 1) 13 Mar 2015
Technical article Delta-sigma ADC basics: Walking around the delta-sigma blocks 03 Mar 2015

Design & development

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

Evaluation board

ADS9817EVM-PDK — ADS9817 performance demonstration kit for simultaneous-sampling ADC with integrated analog front end

The ADS9817 evaluation module (EVM) performance demonstration kit (PDK) is a platform for evaluating the ADS9817, which is a eight-channel, 18-bit, 8-MSPS (per channel) successive approximation register (SAR) analog-to-digital converter (ADC) with an integrated analog front end (AFE) and ADC (...)

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Simulation model

ADS9817 TINA-TI Reference Design

SBAM495.TSC (37 KB) - TINA-TI Reference Design
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Calculation tool

ADC-INPUT-CALC — Analog-to-digital converter (ADC) input driver design tool supporting multiple input types

ADC-INPUT-CALC is an online tool that provides support for designing the input buffer to an analog-to-digital converter (ADC). It offers 24 different op-amp based buffer circuits that can be used to drive an ADC input. The available topologies cover differential, single-ended and (...)
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Calculation tool

ANALOG-ENGINEER-CALC — Analog engineer's calculator

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 operational-amplifier (...)
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Simulation tool

TINA-TI — SPICE-based analog simulation program

TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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