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Product details

Parameters

Applications 3-lead ECG, 5-lead ECG, 6-lead ECG, Patient monitoring Number of input channels 4 Resolution (Bits) 16 Interface type SPI Operating temperature range (C) 0 to 70 open-in-new Find other Biosensing AFEs

Package | Pins | Size

NFBGA (ZXG) 64 64 mm² 8 x 8 TQFP (PAG) 64 144 mm² 12 x 12 open-in-new Find other Biosensing AFEs

Features

  • Eight Low-Noise PGAs and
    Eight High-Resolution ADCs (ADS1198)
  • Low Power: 0.55mW/channel
  • Input-Referred Noise:
    12µVPP (150Hz BW, G = 6)
  • Input Bias Current: 200pA
  • Data Rate: 125SPS to 8kSPS
  • CMRR: –105dB
  • Programmable Gain: 1, 2, 3, 4, 6, 8, or 12
  • Supports AAMI EC11, EC13, IEC60601-1, IEC60601-2-27, and IEC60601-2-51 Standards
  • Supplies: Unipolar or Bipolar
    • Analog: 2.7V to 5.25V
    • Digital: 1.65V to 3.6V
  • Built-In Right Leg Drive Amplifier, Lead-Off Detection, WCT, Test Signals
  • Pace Detection Channel Select
  • Built-In Oscillator and Reference
  • Flexible Power-Down, Standby Mode
  • SPI™-Compatible Serial Interface
  • Operating Temperature Range:
    0°C to +70°C
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Description

The ADS1194/6/8 are a family of multichannel, simultaneous sampling, 16-bit, delta-sigma (ΔΣ) analog-to-digital converters (ADCs) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator.

With its high levels of integration and exceptional performance, the ADS1194/6/8 family enables the creation of scalable medical instrumentation systems at significantly reduced size, power, and overall cost.

The ADS1194/6/8 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 ADS1194/6/8 operate at data rates as high as 8kSPS, thereby allowing the implementation of software pace detection. Lead-off detection can be implemented internal to the device, either with a pull-up/pull-down resistor or an excitation current sink/source. Three integrated amplifiers generate the Wilson Center Terminal (WCT) and the Goldberger terminals (GCT) required for a standard 12-lead medical electrocardiogram (ECG).

Multiple ADS1194/6/8 devices can be cascaded in high channel count systems in a daisy-chain configuration.

Package options include a tiny 8mm × 8mm, 64-ball BGA and a TQFP-64. Both packages are specified over the temperature range of 0°C to +70°C.

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Technical documentation

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Type Title Date
* Data sheet Low-Power, 8-Channel, 16-Bit Analog Front-End for Biopotential Measurements datasheet (Rev. C) Nov. 29, 2011
E-book Fundamentals of Precision ADC Noise Analysis Jun. 19, 2020
Application note Digital Filter Types in Delta-Sigma ADCs Jun. 27, 2017
Application note How delta-sigma ADCs work, Part 1 (Rev. A) Sep. 19, 2016
Technical article Offset correction improves the next generation of heart-rate smart watches Aug. 24, 2015
E-book Best of Baker's Best: Precision Data Converters -- Delta-Sigma ADCs Mar. 19, 2015
Technical article A new way to illuminate the human condition Dec. 30, 2013
Technical article Oximeter signaling: There’s more than meets the eye Dec. 04, 2013
Technical article Virtual hospital implementation using a worn health monitor Nov. 13, 2013
User guide TIPD111 Verified Design Reference Guide Jun. 18, 2013
Application note How delta-sigma ADCs work, Part 2 Nov. 09, 2011
Application note Improving Common-Mode Rejection Using the Right-Leg Drive Amplifier Jul. 06, 2011
Application note Thermal Noise Analysis in ECG Applications May 03, 2011
Application note Respiration Rate Measurement Using Impedance Pneumography Mar. 01, 2011
Application note 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 BOARD Download
document-generic User guide
Description

The ADS1198ECG FE is a reference design for the ADS1198, a simultaneous sampling, 16-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC) with a built-in programmable gain amplifier (PGA), internal reference, and an onboard oscillator. The ADS1198 incorporates all of the features that (...)

Features
  • Easy-to-use evaluation software for Microsoft™ Windows XP and Windows 7
  • Built-in analysis tools including oscilloscope, FFT, and histogram displays
  • Flexible input configurations
  • Optional external reference circuits
  • Ability to export data in simple test files for post processing

Design tools & simulation

SIMULATION MODEL Download
SBAM080C.ZIP (144 KB) - IBIS Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

Reference designs

REFERENCE DESIGNS Download
Reference Design for Software Pacemaker Detection in an ECG
TIPD197 This circuit is designed to condition and digitize an electrocardiogram signal output from the integrated PACE_OUT buffer on the ADS129x to detect artifacts of an artificial pacemaker. This circuit includes an op amp which serves as a signal conditioner and input driver for a fast-sampling SAR ADC.
document-generic Schematic
Design files
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

CAD/CAE symbols

Package Pins Download
NFBGA (ZXG) 64 View options
TQFP (PAG) 64 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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