ADS1294 datasheet(21/88 Pages) TI

21 / 88 page

ADS1294, ADS1294R

ADS1296, ADS1296R

ADS1298, ADS1298R

www.ti.com

SBAS459H

– JANUARY 2010 – REVISED OCTOBER 2011

OVERVIEW

NOTE

The ADS1294R/6R/8R channel performance differs from the ADS1294/6/8 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.

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 integrate various

ECG-specific

functions

that

make

them

well-suited

for

scalable

electrocardiogram

(ECG),

electroencephalography (EEG), and electromyography (EMG) applications. The devices can also be used in

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

The ADS129x have a highly programmable multiplexer that allows for temperature, supply, input short, and RLD

measurements. Additionally, the multiplexer allows any of the input electrodes to be programmed as the patient

reference drive. The PGA gain can be chosen from one of seven settings (1, 2, 3, 4, 6, 8, and 12). The ADCs in

the device offer data rates from 250SPS to 32kSPS. Communication to the device is accomplished using an

SPI-compatible interface. The device provides four GPIO pins for general use. Multiple devices can be

synchronized using the START pin.

The internal reference can be programmed to either 2.4V or 4V. The internal oscillator generates a 2.048MHz

clock. The versatile right leg drive (RLD) block allows the user to choose the average of any combination of

electrodes to generate the patient drive signal. Lead-off detection can be accomplished either by using a

pull-up/pull-down resistor or a current source/sink. An internal ac lead-off detection feature is also available. The

device supports both hardware PACE detection and software PACE detection. The Wilson Central Terminal

(WCT) block can be used to generate the WCT point of the standard 12-lead ECG.

Additionally, the ADS1294R, ADS1296R, and ADS1298R provide options for an internal respiration modulator

and a demodulator circuit in the signal path of channel 1.

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Product Folder Link(s): ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R

ADS1294 Datasheet(PDF) 21 Page - Texas Instruments

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