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ADS1292 Arkusz danych(PDF) 3 Page - Texas Instruments

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Numer części ADS1292
Szczegółowy opis  Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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ADS1291
ADS1292
ADS1292R
www.ti.com
SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012
ELECTRICAL CHARACTERISTICS
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
ANALOG INPUTS
Full-scale differential input voltage
±VREF / gain
V
(AINP – AINN)
See the Input Common-Mode Range
Input common-mode range
subsection of the PGA Settings and Input
Range section
Input capacitance
20
pF
TA = +25°C, input = 1.5 V
±200
pA
Input bias current (PGA chop = 8 kHz)
TA = –40°C to +85°C, input = 1.5 V
±1
nA
Chop rates other than 8 kHz
See Pace Detect section
No pull-up or pull-down current source
1000
M
Current source lead-off detection (nA),
500
M
DC input impedance
AVSS + 0.3 V < AIN < AVDD – 0.3 V
Current source lead-off detection (µA),
100
M
AVSS + 0.6 V < AIN < AVDD – 0.6 V
PGA PERFORMANCE
Gain settings
1, 2, 3, 4, 6, 8, 12
With a 4.7-nF capacitor on PGA output
Bandwidth
(see PGA Settings and Input Range section
8.5
kHz
for details)
ADC PERFORMANCE
Resolution
24
Bits
Data rate
fCLK = 512 kHz
125
8000
SPS
CHANNEL PERFORMANCE (DC Performance)
Gain = 6(3), 10 seconds of data
8
μVPP
Gain = 6, 256 points, 0.5 seconds of data
8
11
μVPP
Input-referred noise
Gain settings other than 6,
See Noise Measurements section
data rates other than 500 SPS
Integral nonlinearity
Full-scale with gain = 6, best fit
2
ppm
Offset error
±100
μV
Offset error drift
2
μV/°C
Offset error with calibration
15
μV
Gain error
Excluding voltage reference error
±0.1
±0.2
% of FS
Gain drift
Excluding voltage reference drift
2
ppm/°C
Gain match between channels
0.2
% of FS
CHANNEL PERFORMANCE (AC performance)
CMRR
Common-mode rejection ratio
fCM = 50 Hz and 60 Hz
(4)
–105
–120
dB
PSRR
Power-supply rejection ratio
fPS = 50 Hz and 60 Hz
90
dB
Crosstalk
fIN = 50 Hz and 60 Hz
–120
dB
SNR
Signal-to-noise ratio
fIN = 10 Hz input, gain = 6
107
dB
10 Hz, –0.5 dBFs, CFILTER = 4.7nF
–104
dB
100 Hz, –0.5 dBFs, CFILTER = 4.7nF
–95
dB
THD
Total harmonic distortion
ADS1292R channel 1, 10 Hz, –0.5 dBFS,
–82
dB
CFILTER = 47 nF
(1)
Performance is applicable for 5-V operation as well. Production testing for limits is performed at 3 V.
(2)
CFILTER is the capacitor accross the PGA outputs; see the PGA Settings and Input Range section for details.
(3)
Noise data measured in a 10-second interval. Test not performed in production. Input-referred noise is calculated with input shorted
(without electrode resistance) over a 10-second interval.
(4)
CMRR is measured with a common-mode signal of AVSS + 0.3 V to AVDD – 0.3 V. The values indicated are the minimum of the two
channels.
Copyright © 2011–2012, Texas Instruments Incorporated
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