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ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R
SBAS459K – JANUARY 2010 – REVISED AUGUST 2015
ADS129x Low-Power, 8-Channel, 24-Bit Analog Front-End for Biopotential Measurements
1 Features
1
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.
Device Information
(1)
PART NUMBER
ADS129x,
ADS129xR
GPIO AND CONTROL
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Eight Low-Noise PGAs and Eight High-Resolution
ADCs (ADS1298, ADS1298R)
Low Power: 0.75 mW/channel
Input-Referred Noise: 4
μV
PP
(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
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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
Simplified Schematic
REF
Test Signals and
Monitors
ADS129xR
A1
RESP
DEMOD
Reference
SPI
ADC1
SPI
A2
ADC2
A3
ADC3
PACKAGE
NFBGA (64)
TQFP (64)
BODY SIZE (NOM)
8.00 mm × 8.00 mm
10.00 mm × 10.00 mm
CLK
INPUTS
A4
MUX
ADC4
Control
Oscillator
A5
ADC5
A6
ADC6
A7
ADC7
(1) For all available packages, see the package option addendum
at the end of the data sheet.
A8
To Channel
WCT
Wilson
Terminal
ADC8
RESP
¼
Resp
¼
¼
ADS129xR
RLD
PACE
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R
SBAS459K – JANUARY 2010 – REVISED AUGUST 2015
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features
..................................................................
1
Applications
...........................................................
1
Description
.............................................................
1
Revision History.....................................................
2
Device Comparison
...............................................
5
Pin Configuration and Functions
.........................
6
Specifications.......................................................
12
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
Absolute Maximum Ratings ....................................
ESD Ratings............................................................
Recommended Operating Conditions.....................
Thermal Information ................................................
Electrical Characteristics.........................................
Timing Requirements: Serial Interface....................
Switching Characteristics: Serial Interface..............
Typical Characteristics ............................................
12
12
12
13
13
17
17
18
9.4 Device Functional Modes........................................
51
9.5 Programming...........................................................
59
9.6 Register Maps .........................................................
65
10 Application and Implementation........................
84
10.1 Application Information..........................................
84
10.2 Typical Applications ..............................................
89
11 Power Supply Recommendations
.....................
96
11.1 Power-Up Sequencing ..........................................
96
11.2 Connecting to Unipolar (3 V or 1.8 V) Supplies....
97
11.3 Connecting to Bipolar (±1.5 V or ±1.8 V)
Supplies ...................................................................
97
12 Layout...................................................................
98
12.1 Layout Guidelines .................................................
98
12.2 Layout Example ....................................................
99
13 Device and Documentation Support
...............
100
13.1
13.2
13.3
13.4
13.5
Related Links ......................................................
Community Resources........................................
Trademarks .........................................................
Electrostatic Discharge Caution ..........................
Glossary ..............................................................
100
100
100
100
100
8
9
Parameter Measurement Information
................
22
8.1 Noise Measurements ..............................................
22
Detailed Description
............................................
24
9.1 Overview .................................................................
24
9.2 Functional Block Diagram .......................................
25
9.3 Feature Description.................................................
26
14 Mechanical, Packaging, and Orderable
Information
.........................................................
100
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision J (January 2014) to Revision K
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Page
Added
ESD Ratings
table,
Feature Description
section,
Device Functional Modes, Application and Implementation
section,
Power Supply Recommendations
section,
Layout
section,
Device and Documentation Support
section, and
Mechanical, Packaging, and Orderable Information
section .................................................................................................
1
Changed text throughout data sheet for clarity ......................................................................................................................
1
Added note to DAISY_IN pin .................................................................................................................................................
8
Added note to DAISY_IN pin ...............................................................................................................................................
10
Changed
Equation 3
............................................................................................................................................................
32
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Changes from Revision I (January 2012) to Revision J
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Page
Changed NC pin discription in
Pin Assignments
table .........................................................................................................
10
Changed NC pin discription in
Pin Assignments
table .........................................................................................................
10
Added graph of INTERNAL V
REF
DRIFT vs TEMPERATURE .............................................................................................
21
Changed order of subsections in the
Theory of Operation
section ......................................................................................
26
Changed single-ended input description to correct input range values ...............................................................................
30
Changed
Figure 27
to show correct input range for single-ended inputs ............................................................................
30
Changed
Figure 28
to show correct input range for single-ended inputs ............................................................................
30
Deleted text regarding large scale signal .............................................................................................................................
31
Changed
Figure 32
to provide a more stable external reference driver circuit ....................................................................
33
Updated
Figure 57
...............................................................................................................................................................
51
Added
Figure 58
..................................................................................................................................................................
52
Added discussion of SCLK/DRDY bus behavior to
Data Ready (DRDY)
section................................................................
53
Added
Figure 60
..................................................................................................................................................................
53
Submit Documentation Feedback
Copyright © 2010–2015, Texas Instruments Incorporated
Product Folder Links:
ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R
ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R
www.ti.com
SBAS459K – JANUARY 2010 – REVISED AUGUST 2015
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Added
status Word
section and
Figure 61
to discuss the status word ................................................................................
53
Added
Readback Length
section..........................................................................................................................................
53
Added
SCLK Clocking Methods
section...............................................................................................................................
60
Changed units in TEST_AMP bit description in CONFIG2 register .....................................................................................
68
Changed
Figure 93
to clarify Initial Flow at Power-Up .........................................................................................................
85
Changed
Power-Up Sequencing
section text to clarify start-up timing ................................................................................
96
Changed
Figure 105
............................................................................................................................................................
96
Changed power-up reset wait time in
Table 38
...................................................................................................................
96
Changes from Revision H (October 2011) to Revision I
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Page
Added eighth Features bullet (list of standards supported)....................................................................................................
1
Updated BGA pin out..............................................................................................................................................................
6
Deleted duplicate
Digital input voltage
and
Digital output voltage
rows from Absolute Maximum Ratings table.................
12
Changed parameter name of Channel Performance,
Common-mode rejection ratio
and
Power-supply rejection ratio
parameters in Electrical Characteristics table ......................................................................................................................
14
Updated
Functional Block Diagram
.....................................................................................................................................
25
Updated description of
Analog Input
section........................................................................................................................
30
Updated
Figure 30
...............................................................................................................................................................
32
Updated
Figure 33
...............................................................................................................................................................
34
Updated
Figure 34
...............................................................................................................................................................
35
Changed description of START pin in
START
section.........................................................................................................
51
Changed description of
Data Ready (DRDY)
section ..........................................................................................................
52
Changed conversion description in
Single-Shot Mode
section ............................................................................................
54
Changed conversion description in
Continuous Mode
section.............................................................................................
55
Changed Unit column in
Table 14
........................................................................................................................................
55
Added power-down recommendation to bit 7 description of
CHnSET: Individual Channel Settings
section.......................
71
Changed description of bit 5 in
RESP: Respiration Control Register
section ......................................................................
80
Corrected name of bit 6 in
WCT2: Wilson Central Terminal Control Register
section.........................................................
83
Changes from Revision G (February 2011) to Revision H
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Page
Changed footnote 1 of BGA Pin Assignments table ..............................................................................................................
7
Added footnote 1 cross-reference to
RLDIN, TESTP_PACE_OUT1,
and
TESTP_PACE_OUT
in BGA Pin
Assignments table ..................................................................................................................................................................
7
Changed footnote 1 of PAG Pin Assignments table ............................................................................................................
10
Added footnote 1 cross-reference to
TESTP_PACE_OUT1, TESTP_PACE_OUT2,
and RLDIN in PAG Pin
Assignments table ................................................................................................................................................................
10
Changed description of
AVSS
and
AVDD
in PAG Pin Assignments table ..........................................................................
11
Added
(ADS1298)
to
High-Resolution mode
and
Low-Power mode
test conditions of Supply Current section in
Electrical Characteristics table .............................................................................................................................................
16
Changed 3-V Power Dissipation,
Quiescent channel power
test conditions in
Electrical Characteristics
table ..................
16
Changed 5-V Power Dissipation,
Quiescent channel power
test conditions in
Electrical Characteristics
table ..................
16
Changed title of
Figure 20
...................................................................................................................................................
20
Updated
Figure 42
...............................................................................................................................................................
41
Added new paragraph to
Respiration
section ......................................................................................................................
46
Updated
Equation 5
.............................................................................................................................................................
49
Changed title of
Table 13
....................................................................................................................................................
54
Submit Documentation Feedback
3
Copyright © 2010–2015, Texas Instruments Incorporated
Product Folder Links:
ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R
ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R
SBAS459K – JANUARY 2010 – REVISED AUGUST 2015
www.ti.com
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Updated
Figure 66
...............................................................................................................................................................
57
Changed description of
STANDBY: Enter STANDBY Mode
section ...................................................................................
61
Changed bit name for bits 5, 6, and 7 in ID register of
Table 16
........................................................................................
65
Changed bit name for bits 5, 6, and 7 in
ID: ID Control Register
section ............................................................................
66
Added footnote to
Figure 97
................................................................................................................................................
89
Changed description of solid ceramic capacitor in
Power Supplies and Grounding
section ...............................................
96
Changed description of
Connecting the Device to Bipolar (±1.5 V/1.8 V) Supplies
section ................................................
97
4
Submit Documentation Feedback
Copyright © 2010–2015, Texas Instruments Incorporated
Product Folder Links:
ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R
ADS1294, ADS1294R, ADS1296, ADS1296R, ADS1298, ADS1298R
www.ti.com
SBAS459K – JANUARY 2010 – REVISED AUGUST 2015
5 Device Comparison
PACKAGE
OPTIONS
TQFP-64
NFBGA-64
TQFP-64
NFBGA-64
TQFP-64
NFBGA-64
TQFP-64
NFBGA-64
NFBGA-64
TQFP-64
NFBGA-64
NFBGA-64
TQFP-64
NFBGA-64
NFBGA-64
OPERATING
TEMPERATURE
RANGE
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
0°C to 70°C
–40°C to +85°C
0°C to 70°C
–40°C to +85°C
–40°C to +85°C
0°C to 70°C
–40°C to +85°C
–40°C to +85°C
0°C to 70°C
–40°C to +85°C
RESPIRATION
CIRCUITRY
No
No
No
External
Yes
External
Yes
External
Yes
8
24
32 kSPS
6
24
32 kSPS
ADC
RESOLUTION
16
16
16
MAXIMUM
SAMPLING
RATE
8 kSPS
8 kSPS
8 kSPS
PRODUCT
ADS1194
ADS1196
ADS1198
ADS1294
ADS1294R
ADS1296
ADS1296R
ADS1298
ADS1298R
CHANNELS
4
6
8
4
24
32 kSPS
Copyright © 2010–2015, Texas Instruments Incorporated
Submit Documentation Feedback
5
Product Folder Links:
ADS1294 ADS1294R ADS1296 ADS1296R ADS1298 ADS1298R
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