ADS1291_14 Datasheet, PDF (1/75 Pages) Texas Instruments – Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements

www.ti.com
ADS1291
ADS1292
ADS1292R
SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012
Low-Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements
Check for Samples: ADS1291, ADS1292 , ADS1292R
FEATURES
1
•23 Two Low-Noise PGAs and
Two High-Resolution ADCs
(ADS1292 and ADS1292R)
• Low Power: 335 μW/channel
• Input-Referred Noise: 8 μV_PP
(150-Hz BW, G = 6)
• Input Bias Current: 200 pA
• Data Rate: 125 SPS to 8 kSPS
• CMRR: –105 dB
• Programmable Gain: 1, 2, 3, 4, 6, 8, or 12
• Supplies: Unipolar or Bipolar
– Analog: 2.7 V to 5.25 V
– Digital: 1.7 V to 3.6 V
• Built-In Right Leg Drive Amplifier, Lead-Off
Detection, Test Signals
• Integrated Respiration Impedance
Measurement (ADS1292R)
• Built-In Oscillator and Reference
• Flexible Power-Down, Standby Mode
• SPI™-Compatible Serial Interface
• Operating Temperature Range: –40°C to +85°C
APPLICATIONS
• Medical Instrumentation (ECG) including:
– Patient monitoring: Holter, event, stress,
and vital signs including ECG, AED, and
telemedicine
– Sports and fitness
(heart rate, respiration, and ECG)
• High-Precision, Simultaneous, Multichannel
Signal Acquisition
The ADS1291, ADS1292, and ADS1292R
incorporate all features commonly required in
portable, low-power medical electrocardiogram
(ECG), sports, and fitness applications.
With high levels of integration and exceptional
performance, the ADS1291, ADS1292, and
ADS1292R enable the creation of scalable medical
instrumentation systems at significantly reduced size,
power, and overall cost.
The ADS1291, ADS1292, and ADS1292R 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 ADS1291, ADS1292, and
ADS1292R operate at data rates up to 8 kSPS. Lead-
off detection can be implemented internal to the
device, using the device internal excitation current
sink or source. The ADS1292R version includes a
fully integrated respiration impedance measurement
function.
The devices are packaged in a 5-mm × 5-mm, 32-pin
thin quad flat pack (TQFP) and a 4-mm x 4-mm, 32-
pin quad flat pack with no leads (QFN). Operating
temperature is specified from –40°C to +85°C.
REF
Test Signals and
Monitors
Reference
SPI
MUX
(ADS1292R)
A1
RESP
DEMOD
ADC1
A2
ADC2
To Channel
Control
Oscillator
DESCRIPTION
¼
(ADS1292R)
The ADS1291, ADS1292, and ADS1292R are
RESP
MOD
¼
RESP
multichannel, simultaneous sampling, 24-bit, delta-
sigma (ΔΣ) analog-to-digital converters (ADCs) with a
RLD
built-in programmable gain amplifier (PGA), internal
reference, and an onboard oscillator.
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.
SPI is a trademark of Motorola.
2
All other trademarks are the property of their respective owners.
3
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 © 2011–2012, Texas Instruments Incorporated