ASD1194 Datasheet, PDF (1/76 Pages) Texas Instruments – Low-Power, 8-Channel, 16-Bit Analog Front-End for Biopotential Measurements

ADS1194, ADS1196
ADS1198
www.ti.com
SBAS471C – APRIL 2010 – REVISED NOVEMBER 2011
Low-Power, 8-Channel, 16-Bit Analog Front-End
for Biopotential Measurements
Check for Samples: ADS1194, ADS1196, ADS1198
FEATURES
1
•23 Eight Low-Noise PGAs and
Eight High-Resolution ADCs (ADS1198)
• Low Power: 0.55mW/channel
• Input-Referred Noise:
12μV_PP (150Hz BW, G = 6)
• Input Bias Current: 200pA
• Data Rate: 125SPS to 8kSPS
• CMRR: –105dB
• Programmable Gain: 1, 2, 3, 4, 6, 8, or 12
• Supports AAMI EC11, EC13, IEC60601-1,
IEC60601-2-27, and IEC60601-2-51 Standards
• Supplies: Unipolar or Bipolar
– Analog: 2.7V to 5.25V
– Digital: 1.65V to 3.6V
• Built-In Right Leg Drive Amplifier, Lead-Off
Detection, WCT, Test Signals
• Pace Detection Channel Select
• Built-In Oscillator and Reference
• Flexible Power-Down, Standby Mode
• SPI™-Compatible Serial Interface
• Operating Temperature Range:
0°C to +70°C
APPLICATIONS
• Medical Instrumentation (ECG) including:
– Patient monitoring; Holter, event, stress,
and vital signs Including ECG, AED,
Telemedicine
– Evoked audio potential (EAP), Sleep study
monitor
• High-Precision, Simultaneous, Multichannel
Signal Acquisition
DESCRIPTION
The ADS1194/6/8 are a family of multichannel,
simultaneous sampling, 16-bit, delta-sigma (ΔΣ)
analog-to-digital converters (ADCs) with a built-in
programmable gain amplifier (PGA), internal
reference, and an onboard oscillator.
With its high levels of integration and exceptional
performance, the ADS1194/6/8 family enables the
creation of scalable medical instrumentation systems
at significantly reduced size, power, and overall cost.
The ADS1194/6/8 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 ADS1194/6/8
operate at data rates as high as 8kSPS, 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 Center
Terminal (WCT) and the Goldberger terminals (GCT)
required for a standard 12-lead medical
electrocardiogram (ECG).
Multiple ADS1194/6/8 devices can be cascaded in
high channel count systems in a daisy-chain
configuration.
Package options include a tiny 8mm × 8mm, 64-ball
BGA and a TQFP-64. Both packages are specified
over the temperature range of 0°C to +70°C.
REF
Test Signals and
Monitors
Reference
A1
ADC1
SPI
A2
ADC2
A3
ADC3
A4
MUX
A5
ADC4
ADC5
Control
Oscillator
A6
ADC6
A7
ADC7
WCT
Wilson
Terminal
A8
ADC8
To Channel
¼¼
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.
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 © 2010–2011, Texas Instruments Incorporated