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ADS1291

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24-bit, 1-ch, Low-Power Analog Front END (AFE) for ECG Applications

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24-bit, 1-ch, Low-Power Analog Front END (AFE) for ECG Applications

ADS1291

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Product details

Parameters

Resolution (Bits) 24 Number of input channels 1 Sample rate (Max) (kSPS) 8 Interface SPI Architecture Delta-Sigma Input type Differential, Single-Ended Multi-channel configuration — Rating Catalog Reference mode Int, Ext Input range (Max) (V) 5.25 Input range (Min) (V) 0 Features Daisy-Chainable, GPIO, Oscillator, PGA Operating temperature range (C) -40 to 85 Power consumption (Typ) (mW) 0.35 Analog voltage AVDD (Min) (V) 2.7 SNR (dB) 107 Analog voltage AVDD (Max) (V) 5.25 Digital supply (Min) (V) 1.7 Digital supply (Max) (V) 3.6 Approx. price (US$) 3.30 | 1ku open-in-new Find other Precision ADCs (<=10MSPS)

Package | Pins | Size

TQFP (PBS) 32 49 mm² 7 x 7 VQFN (RSM) 32 16 mm² 4 x 4 open-in-new Find other Precision ADCs (<=10MSPS)

Features

  • Two low-noise PGAs and two high-resolution ADCs
    (ADS1292 and ADS1292R)
  • Low power: 335 µW/channel
  • Input-referred noise: 8 µVPP
    (150-Hz BW, G = 6)
  • Input bias current: 200 pA
  • Data rate: 125 SPS to 8 kSPS
  • CMRR: 120 dB
  • Programmable gain: 1, 2, 3, 4, 6, 8, or 12
  • Supplies: unipolar or bipolar
    • Analog: 2.7 V to 5.25 V
    • Digital: 1.7 V to 3.6 V
  • Built-in right leg drive amplifier, lead-off detection, test signals
  • Integrated respiration impedance measurement (ADS1292R)
  • Built-in oscillator and reference
  • Flexible power-down, standby mode
  • SPI™-compatible serial interface
  • Operating temperature range: –40°C to +85°C

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Description

The ADS1291, ADS1292, and ADS1292R are multichannel, simultaneous sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator.

The ADS1291, ADS1292, and ADS1292R incorporate all features commonly required in portable, low-power medical electrocardiogram (ECG), sports, and fitness applications.

With high levels of integration and exceptional performance, the ADS1291, ADS1292, and ADS1292R enable the creation of scalable medical instrumentation systems at significantly reduced size, power, and overall cost.

The ADS1291, ADS1292, and ADS1292R have a flexible input multiplexer per channel that can be independently connected to the internally-generated signals for test, temperature, and lead-off detection. Additionally, any configuration of input channels can be selected for derivation of the right leg drive (RLD) output signal. The ADS1291, ADS1292, and ADS1292R operate at data rates up to 8 kSPS. Lead-off detection can be implemented internal to the device, using the device internal excitation current sink or source. The ADS1292R version includes a fully integrated respiration impedance measurement function.

The devices are packaged in a 5-mm × 5-mm, 32-pin thin quad flat pack (TQFP) and a 4-mm x 4-mm, 32-pin quad flat pack with no leads (VQFN). Operating temperature is specified from –40°C to +85°C.

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Technical documentation

= Featured
No results found. Please clear your search and try again. View all 8
Type Title Date
* Datasheet ADS129x Low-Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements datasheet (Rev. C) Apr. 24, 2020
Application notes QFN and SON PCB Attachment (Rev. B) Aug. 24, 2018
Application notes Digital Filter Types in Delta-Sigma ADCs Jun. 27, 2017
More literature Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs Mar. 19, 2015
Application notes Understanding Lead-Off Detection in ECG (Rev. A) Jan. 14, 2015
Application notes Improving Common-Mode Rejection Using the Right-Leg Drive Amplifier Jul. 06, 2011
Application notes Respiration Rate Measurement Using Impedance Pneumography Mar. 01, 2011
Application notes Analog Front-End Design for ECG Systems Using Delta-Sigma ADCs (Rev. A) Apr. 13, 2010

Design & development

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

Hardware development

EVALUATION BOARDS Download
Description

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 transformer-coupled (...)

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EVALUATION BOARDS Download
document-generic User guide
$99.00
Description

The ADS1x9xECG FE is a demonstration kit for the ADS1192 and ADS1292, a two channel, simultaneous sampling, 16-bit or 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with a built-in programmable gain amplifier (PGA), internal reference, and an on-board oscillator. The ADS1192 (...)

Features
  • Easy-to-use evaluation software for Microsoft™ Windows XP or Windows 7
  • Built-in analysis tools including oscilloscope, FFT, and histogram displays
  • Flexible input configurations
  • Digital Low Pass, High Pass, and 50/60Hz notch filters for post processing
  • Real time data streaming from the demo board to the (...)
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Design tools & simulation

SIMULATION MODELS Download
SBAM163A.ZIP (145 KB) - IBIS Model
SIMULATION TOOLS Download
SPICE-based analog simulation program
TINA-TI — 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 (...)
document-generic User guide
CALCULATION TOOLS Download
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 (...)
Features
  • Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
    • Noise calculations
    • Common unit translation
  • Solves common amplifier circuit design problems
    • Gain selections using standard resistors
    • Filter configurations
    • Total noise for common amplifier configurations
  • (...)
View details

Reference designs

REFERENCE DESIGNS Download
Multi-Parameter Bio-Signal Monitor Reference Design For Personal Monitoring
TIDM-BIOSIGNMONITOR — The Multi-Parameter Bio-signal Monitor (MPBSM) is a proof-of-concept Evaluation Module (EVM) that is capable of measuring three of the four primary vital signs. The MPBSM proof of concept can directly measure Electrocardiogram (ECG), Galvanic Skin Response (GSR), and skin temperature. The MPBSM (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Wireless Heart Monitor with Bluetooth Low Energy
TIDA-00096 — The Wireless Heart Rate Monitor with Bluetooth low-energy (BLE) is intended as a reference design that customers can use to develop end-products for battery-powered, 3-channel health and fitness electrocardiogram (ECG) applications.  The ADS1293 is a highly integrated low-power analog front end (...)
document-generic Schematic document-generic User guide

CAD/CAE symbols

Package Pins Download
TQFP (PBS) 32 View options
VQFN (RSM) 32 View options

Ordering & quality

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Training series

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Videos

Hands-on Experiment – System Power Scaling

This hands-on experiment shows the impact that ADC sampling rate has on the system power consumption.

Posted: 09-Jan-2018
Duration: 13:54

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