ADS1294, ADS1296
ADS1298
www.ti.com
SBAS459E –JANUARY 2010–REVISED AUGUST 2010
Low-Power, 8-Channel, 24-Bit Analog Front-End for Biopotential Measurements
Check for Samples: ADS1294, ADS1296, ADS1298
With its high levels of integration and exceptional
1
FEATURES
performance, the ADS1294/6/8 family enables the
creation of scalable medical instrumentation systems
at significantly reduced size, power, and overall cost.
23
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Eight Low-Noise PGAs and
Eight High-Resolution ADCs (ADS1298)
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•
•
•
•
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Low Power: 0.75mW/channel
Input-Referred Noise: 4mVPP (150Hz BW, G = 6)
Input Bias Current: 200pA
The ADS1294/6/8 have a flexible input multiplexer
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 ADS1294/6/8
operate at data rates as high as 32kSPS, thereby
allowing the implementation of software pace
detection. Lead-off detection can be implemented
internal to the device, either with a pull-up/pull-down
resistor or an excitation current sink/source. Three
integrated amplifiers generate the Wilson Central
Terminal (WCT) and the Goldberger Central
Terminals (GCT) required for a standard 12-lead
ECG.
Data Rate: 250SPS to 32kSPS
CMRR: –115dB
Programmable Gain: 1, 2, 3, 4, 6, 8, or 12
Supplies: Unipolar or Bipolar
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Analog: 2.7V to 5.25V
Digital: 1.65V to 3.6V
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Built-In Right Leg Drive Amplifier, Lead-Off
Detection, WCT, Test Signals
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Pace Detection
Digital Pace Detection Capability
Built-In Oscillator and Reference
Flexible Power-Down, Standby Mode
SPI™-Compatible Serial Interface
Operating Temperature Range: –40°C to +85°C
Multiple ADS1294/6/8 devices can be cascaded in
high channel count systems in
configuration.
a
daisy-chain
Package options include a tiny 8mm × 8mm, 64-ball
BGA and a TQFP-64. The BGA version is specified
over the commercial temperature range of 0°C to
+70°C. The TQFP version is specified over the
industrial temperature range of –40°C to +85°C.
APPLICATIONS
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Medical Instrumentation (ECG and EEG)
including:
REF
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Patient monitoring; Holter, event, stress,
and vital signs including ECG, AED,
telemedicine, fetal ECG
Bispectral index (BIS), Evoked audio
potential (EAP), Sleep study monitor
Test Signals and
Monitors
Reference
ADC1
ADC2
ADC3
ADC4
ADC5
ADC6
ADC7
ADC8
SPI
A1
A2
A3
A4
A5
A6
A7
A8
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High-Precision, Simultaneous, Multichannel
Signal Acquisition
Oscillator
MUX
Control
DESCRIPTION
The ADS1294/6/8 are a family of multichannel,
simultaneous sampling, 24-bit, delta-sigma (ΔΣ)
analog-to-digital converters (ADCs) with a built-in
programmable gain amplifier (PGA), internal
reference, and an onboard oscillator. The
ADS1294/6/8 incorporate all of the features that are
commonly required in medical electrocardiogram
(ECG) and electroencephalogram (EEG) applications.
To Channel
RESP
Wilson
Terminal
WCT
¼
¼
¼
RLD
PACE
1
Please 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.
2
3
SPI is a trademark of Motorola.
All other trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2010, Texas Instruments Incorporated
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