Control
CLK GPIOANDCONTROL
Oscillator
SPI
TestSignalsand
Monitors
PACE
SPI
RLD
Wilson
Terminal
WCT
Reference
REF
ADC7
ADC8
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
A7
A8
A1
A2
A3
A4
A5
A6
MUX
INPUTS
¼ ¼
¼
ToChannel
RESP
Resp
RESP
DEMOD
ADS129xR
ADS129xR
ADS1294, ADS1294R
ADS1296, ADS1296R
ADS1298, ADS1298R
www.ti.com
SBAS459I –JANUARY 2010–REVISED JANUARY 2012
Low-Power, 8-Channel, 24-Bit Analog Front-End for Biopotential Measurements
Check for Samples: ADS1294,ADS1294R,ADS1296,ADS1296R,ADS1298,ADS1298R
With its high levels of integration and exceptional
1FEATURES performance, the ADS1294/6/8/4R/6R/8R family
23•Eight Low-Noise PGAs and Eight enables the development of scalable medical
High-Resolution ADCs (ADS1298, ADS1298R) instrumentation systems at significantly reduced size,
•Low Power: 0.75mW/channel power, and overall cost.
•Input-Referred Noise: 4μVPP (150Hz BW, G = 6) The ADS1294/6/8/4R/6R/8R have a flexible input
multiplexer per channel that can be independently
•Input Bias Current: 200pA connected to the internally-generated signals for test,
•Data Rate: 250SPS to 32kSPS temperature, and lead-off detection. Additionally, any
•CMRR: –115dB configuration of input channels can be selected for
•Programmable Gain: 1, 2, 3, 4, 6, 8, or 12 derivation of the right leg drive (RLD) output signal.
The ADS1294/6/8/4R/6R/8R operate at data rates as
•Supports AAMI EC11, EC13, IEC60601-1, high as 32kSPS, thereby allowing the implementation
IEC60601-2-27, and IEC60601-2-51 Standards of software PACE detection. Lead-off detection can
•Unipolar or Bipolar Supplies: be implemented internal to the device, either with a
AVDD = 2.7V to 5.25V, DVDD = 1.65V to 3.6V pull-up/pull-down resistor or an excitation current
sink/source. Three integrated amplifiers generate the
•Built-In Right Leg Drive Amplifier, Lead-Off Wilson Central Terminal (WCT) and the Goldberger
Detection, WCT, PACE Detection, Test Signals Central Terminals (GCT) required for a standard
•Integrated Respiration Impedance 12-lead ECG. The ADS1294R/6R/8R versions
Measurement (ADS1294R/6R/8R only) include a fully-integrated, respiration impedance
•Digital PACE Detection Capability measurement function.
•Built-In Oscillator and Reference Multiple ADS1294/6/8/4R/6R/8R devices can be
•Flexible Power-Down, Standby Modes cascaded in high channel count systems in a
daisy-chain configuration.
•SPI™-Compatible Serial Interface Package options include a tiny 8mm ×8mm, 64-ball
•Operating Temperature Range: BGA and a TQFP-64. The ADS1294/6/8 BGA version
–40°C to +85°Cis specified over the commercial temperature range of
0°C to +70°C. The ADS1294R/6R/8R BGA and
APPLICATIONS ADS1294/6/8 TQFP versions are specified over the
•Medical Instrumentation (ECG, EMG and EEG): industrial temperature range of –40°C to +85°C.
Patient monitoring; Holter, event, stress, and
vital signs including ECG, AED, telemedicine
Bispectral index (BIS), Evoked audio potential
(EAP), Sleep study monitor
•High-Precision, Simultaneous, Multichannel
Signal Acquisition
DESCRIPTION
The ADS1294/6/8/4R/6R/8R 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
ADS1294/6/8/4R/6R/8R incorporate all of the features
that are commonly required in medical
electrocardiogram (ECG) and electroencephalogram
(EEG) applications.
1Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2SPI is a trademark of Motorola.
3All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date. Copyright ©2010–2012, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.