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ADS1291 Datasheet(PDF) 4 Page - Texas Instruments

Part # ADS1291
Description  Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

ADS1291 Datasheet(HTML) 4 Page - Texas Instruments

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ADS1291
ADS1292
ADS1292R
SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012
www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Minimum and maximum specifications apply from –40°C to +85°C. Typical specifications are at +25°C. All specifications are
at DVDD = 1.8 V, AVDD – AVSS = 3 V
(1), V
REF = 2.42 V, external fCLK = 512 kHz, data rate = 500 SPS, CFILTER = 4.7 nF
(2),
and gain = 6, unless otherwise noted.
ADS1291, ADS1292, ADS1292R
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
DIGITAL FILTER
–3-dB bandwidth
0.262 fDR
Hz
Digital filter settling
Full setting
4
Conversions
RIGHT LEG DRIVE (RLD) AMPLIFIER
RLD integrated noise
BW = 150 Hz
1.4
μVRMS
GBP
Gain bandwidth product
50 k
Ω || 10 pF load, gain = 1
100
kHz
SR
Slew rate
50 k
Ω || 10 pF load, gain = 1
0.07
V/
μs
THD
Total harmonic distortion
fIN = 100 Hz, gain = 1
–85
dB
CMIR
Common-mode input range
AVSS + 0.3
AVDD – 0.3
V
Common-mode resistor matching
Internal 200-k
Ω resistor matching
0.1
%
ISC
Short-circuit current
1.1
mA
Quiescent power consumption
5
μA
LEAD-OFF DETECT
Frequency
See Register Map section for settings
0, fDR / 4
kHz
ILEAD_OFF [1:0] = 00
6
nA
ILEAD_OFF [1:0] = 01
22
nA
Current
ILEAD_OFF [1:0] = 10
6
μA
ILEAD_OFF [1:0] = 11
22
μA
Current accuracy
±10
%
Comparator threshold accuracy
±10
mV
RESPIRATION (ADS1292R)
Internal source
32, 64
kHz
Frequency
External source
32
64
kHz
Phase shift
See Register Map section for settings
0
112.5
168.75
Degrees
Impedance range
IRESP = 30 µA
2000
10,000
Ω
0.05-Hz to 2-Hz brick wall filter, 32-kHz
modulation clock, phase = 112.5,
Impedance measurement noise
40
m
ΩPP
using IRESP = 30 µA with 2-kΩ baseline load,
gain = 4
Maximum modulator current
Using Internal reference
100
μA
EXTERNAL REFERENCE
3-V supply VREF = (VREFP – VREFN)
2
2.5
VDD – 0.3
V
Reference input voltage
5-V supply VREF = (VREFP – VREFN)
2
4
VDD – 0.3
V
VREFN
Negative input
AVSS
V
VREFP
Positive input
AVSS + 2.5
V
Input impedance
120
k
4
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Copyright © 2011–2012, Texas Instruments Incorporated
Product Folder Links: ADS1291 ADS1292 ADS1292R


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