ADS1298: Complete family of Analog Front Ends for ECG/EEG

All devices in the ADS1298 family have low-noise programmable gain amplifiers (PGAs), test signals, a right leg drive amplifier, oscillator, voltage reference and lead-off detection function to simplify design, while significantly reducing board space requirements and cutting power consumption.

ADS1298 | ADS1299 | ADS1293 | ADS1298 Family Table

ADS1293 provides up to 85% lower power consumption in battery powered ECG applications

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For battery powered healthcare patient monitoring system designers who want an integrated solution that is easy to use, high performance, and low power, TI’s ADS1293 is an integrated three-channel analog front end for biopotential measurements that provides very low power consumption with low noise. The ADS1293 delivers a solution that can extend battery life, simplify product design and improve overall performance. The ADS1293 incorporates all features commonly required in portable, low-power medical electrocardiogram (ECG), sports, and fitness applications. With high levels of integration and exceptional performance, the ADS1293 enables the creation of scalable medical instrumentation systems at significantly reduced size, power and overall cost.

ADS1293 Block Diagram Enlarge

ADS1293 Specifications

ADS1293	Parametrics
Resolution (Bits)	24
# Input Channels	3
PGA Gain Setting (typ) (V/V)	3.5
Input-Referred Noise (typ) (uVpp)	7
Sample Rate (Max) (kSPS)	25.6
IVDD Supply Current (typ) (mA)	0.10
IVDDIO Supply Current (typ) (mA)	10
Power/Channel (typ) (mW)	0.30
Power Consumption (typ) (mW)	0.90
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ADS1299: The world’s lowest noise AFE for EEG applications

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The ADS1299 is the industry's lowest noise AFE for the EEG market. Due to the extremely low input-referred noise of the ADS1299, it allows for direct interface to EEG bio-potential signals. With a typical noise of 1µVP-P and a 70Hz input bandwidth, this is a 77% reduction in currently existing medical AFEs.

Before such a low input-referred noise option existed, designers would have to discretely lay out ICs to accommodate an EEG signal, due to the signal amplitude only being 10µV-100µV. In a typical 32-electrode EEG system, about 149 ICs would have to be used to realize the full analog signal chain. With the ADS1299, only four of the ADS1299 devices would have to be used, resulting in a 97% reduction in overall ICs used, making it the only one-chip solution for the EEG signal chain.  This fact, combined with the easy-to-use SPI interface that allows for daisy-chaining, enables a fully realized analog signal chain that greatly reduces board complexity for EEG designers.

ADS1299 Specifications

ADS1299	Parametrics
Resolution (Bits)	24
# Input Channels	8
PGA Gain Setting	1, 2, 4, 6, 8, 12, or 12
Input-referred Noise (typ)	1µVpp
Common-Mode Rejection Ratio (CMRR) (typ)	-120dB
Analog Voltage AV/DD Range	4.75V-5.25V
Signal-to-noise Ratio (SNR) (typ)	121dB
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ADS1298: Complete family of Analog Front Ends for ECG/EEG

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TI is the first to provide a complete family of electrocardiography (ECG) and electroencephalography (EEG) AFEs for applications ranging from portable to diagnostic- and research-grade systems. All devices in the ADS1298 family have low-noise programmable gain amplifiers (PGAs), test signals, a right leg drive amplifier, oscillator, voltage reference and lead-off detection function to simplify design, while significantly reducing board space requirements and cutting power consumption. This level of integration enables customers to focus development efforts on firmware, FDA approvals, field testing and more, rather than hardware design.

ECG Block Diagram

ADS1298 Block Diagram Enlarge

Guides

Medical Applications Guide

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Analog Signal Chain Guide

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Videos

Additional Design Resources

• WEBENCH® Medical AFE Designer
• TI Medical Site

TI E2E community forums

• Precision Data Converter Community

e-Newsletters

• Analog Applications Journal
• Analog Connection

Media Mentions

• En-Genius Says
• ZDNet Healthcare Review
• Electronic Products Featured Product
• EE Times Featured Article

News Releases

• TI introduces industry's first single- and dual-channel, 16- and 24-bit ECG/EEG analog front ends

Application Notes

• Respiration Rate Measurement Based on Impedance Pneumography
  (PDF 697 KB) 1,558 views
  01 Mar 2011, Read Abstract
• Improving Common-Mode Rejection Using the Right-Leg Drive Amplifier
  (PDF 697 KB) 1,558 views
  01 Mar 2011, Read Abstract
• Analog Front-End Design for ECG Systems Using Delta-Sigma ADCs
  (PDF 191 KB) 1,673 views
  13 Apr 2010, Read Abstract