1 Features

1• Eight Low-Noise PGAs and Eight High-Resolution

ADCs (ADS1298, ADS1298R)

• Low Power: 0.75 mW/channel

• Input-Referred Noise: 4 μVPP (150 Hz BW, G = 6)

• Input Bias Current: 200 pA

• Data Rate: 250 SPS to 32 kSPS

• CMRR: –115 dB

• Programmable Gain: 1, 2, 3, 4, 6, 8, or 12

• Supports systems meeting AAMI EC11, EC13,

IEC60601-1, IEC60601-2-27, and IEC60601-2-51

Standards

• Unipolar or Bipolar Supplies:

– AVDD = 2.7 V to 5.25 V

– DVDD = 1.65 V to 3.6 V

• Built-In Right Leg Drive Amplifier, Lead-Off

Detection, Wilson Center Terminal, Pace

Detection, Test Signals

• Integrated Respiration Impedance Measurement

• Digital Pace Detection Capability

• Built-In Oscillator and Reference

• SPI™-Compatible Serial Interface

2 Applications

• Medical Instrumentation (ECG, EMG, and EEG):

Patient Monitoring; Holter, Event, Stress, and Vital

Signs Including ECG, AED, Telemedicine

Bispectral Index (BIS), Evoked Audio Potential

(EAP), Sleep Study Monitor

3 Description

The ADS1294, ADS1296, ADS1298 (ADS129x) and

ADS1294R, ADS1296R ADS1298R (ADS129xR) are

a family of multichannel, simultaneous sampling,

24-bit, delta-sigma (ΔΣ) analog-to-digital converters

(ADCs) with built-in programmable gain amplifiers

(PGAs), internal reference, and an onboard oscillator.

The ADS129x and ADS129xR incorporate all of the features that are commonly required in medical

electrocardiogram (ECG) and electroencephalogram

(EEG) applications. With high levels of integration

and exceptional performance, the ADS129x and

ADS129xR enables the development of scalable

medical instrumentation systems at significantly reduced size, power, and overall cost.

The ADS129x and ADS129xR have a flexible input

multiplexer (mux) 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 ADS129x and ADS129xR operate

at data rates as high as 32 kSPS, thereby allowing

the implementation of software pace detection. Lead•

off detection can be implemented internal to the

device, either with a pullup or pulldown resistor, or an excitation current sink or source. Three integrated

amplifiers generate the Wilson central terminal (WCT)

and the Goldberger central terminals (GCT) required

for a standard 12-lead ECG. The ADS129xR versions

include a fully integrated, respiration impedance

measurement function. Multiple ADS129x and

ADS129xR devices can be cascaded in high channel

count systems in a daisy-chain configuration.

Package options include a tiny 8-mm × 8-mm,

64-ball BGA, and a TQFP-64. The ADS129x BGA

version is specified over the commercial temperature

range of 0°C to 70°C. The ADS129xR BGA and

ADS129x TQFP versions are specified over the

industrial temperature range of –40°C to +85°C.