ADS1198 datasheet(24/110 Pages) TI

24 / 110 page

ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R

SBAS459K – JANUARY 2010 – REVISED AUGUST 2015

www.ti.com

9 Detailed Description

9.1 Overview

NOTE

The ADS129xR channel performance differs from the ADS129x in regards to respiration

circuitry found on channel one. Unless otherwise noted, ADS129x refers to all

specifications and functional descriptions of the ADS1294, ADS1296, ADS1298,

ADS1294R, ADS1296R, and ADS1298R. ADS129xR refers to all specifications and

functional descriptions of only the ADS1294R, ADS1296R, and ADS1298R.

The ADS129x are low-power, multichannel, simultaneously-sampling, 24-bit delta-sigma (

ΔΣ) analog-to-digital

converters (ADCs) with integrated programmable gain amplifiers (PGAs). These devices incorporate various

ECG-specific

functions

that

make

them

well-suited

for

scalable

electrocardiogram

(ECG),

electroencephalography (EEG), and electromyography (EMG) applications. These devices are also used in high-

performance, multichannel data acquisition systems by powering down the ECG-specific circuitry.

The ADS129x have a highly-programmable multiplexer (mux) that allows for temperature, supply, input short,

and RLD measurements. Additionally, the mux allows any of the input electrodes to be programmed as the

patient reference drive. The PGA gain is chosen from one of seven settings: 1, 2, 3, 4, 6, 8, or 12. The ADCs in

the device offer data rates from 250 SPS to 32 kSPS. Communicate with the device by using an SPI-compatible

interface. The device provides four GPIO pins for general use. Synchronize multiple devices by using the START

pin.

Program the internal reference to either 2.4 V or 4 V. The internal oscillator generates a 2.048-MHz clock. The

versatile right-leg drive (RLD) block allows for choosing the average of any combination of electrodes to generate

the patient drive signal. Lead-off detection is accomplished either by using a pullup or pulldown resistor, or a

current source or sink. An internal ac lead-off detection feature is also available. These devices support both

hardware pace detection and software pace detection. Use the Wilson central terminal (WCT) block to generate

the WCT point of the standard 12-lead ECG.

Additionally, the ADS129xR provide options for an internal respiration modulator and a demodulator circuit in the

signal path of channel 1.

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Product Folder Links: ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R

ADS1198 Datasheet(PDF) 24 Page - Texas Instruments

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