ADS1291_14 Datasheet, PDF (4/75 Pages) Texas Instruments – Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements

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 f_CLK = 512 kHz, data rate = 500 SPS, C_FILTER = 4.7 nF⁽²⁾,
and gain = 6, unless otherwise noted.
PARAMETER
DIGITAL FILTER
–3-dB bandwidth
Digital filter settling
RIGHT LEG DRIVE (RLD) AMPLIFIER
RLD integrated noise
GBP
Gain bandwidth product
SR
Slew rate
THD
Total harmonic distortion
CMIR Common-mode input range
Common-mode resistor matching
I_SC
Short-circuit current
Quiescent power consumption
LEAD-OFF DETECT
Frequency
Current
Current accuracy
Comparator threshold accuracy
RESPIRATION (ADS1292R)
Frequency
Phase shift
Impedance range
Impedance measurement noise
Maximum modulator current
EXTERNAL REFERENCE
Reference input voltage
VREFN
VREFP
Negative input
Positive input
Input impedance
TEST CONDITIONS
ADS1291, ADS1292, ADS1292R
MIN
TYP
MAX
UNIT
Full setting
0.262 f_DR
4
Hz
Conversions
BW = 150 Hz
50 kΩ || 10 pF load, gain = 1
50 kΩ || 10 pF load, gain = 1
f_IN = 100 Hz, gain = 1
Internal 200-kΩ resistor matching
AVSS + 0.3
1.4
100
0.07
–85
AVDD – 0.3
0.1
1.1
5
μV_RMS
kHz
V/μs
dB
V
%
mA
μA
See Register Map section for settings
ILEAD_OFF [1:0] = 00
ILEAD_OFF [1:0] = 01
ILEAD_OFF [1:0] = 10
ILEAD_OFF [1:0] = 11
0, f_DR / 4
kHz
6
nA
22
nA
6
μA
22
μA
±10
%
±10
mV
Internal source
External source
See Register Map section for settings
I_RESP = 30 µA
0.05-Hz to 2-Hz brick wall filter, 32-kHz
modulation clock, phase = 112.5,
using I_RESP = 30 µA with 2-kΩ baseline load,
gain = 4
Using Internal reference
32, 64
kHz
32
64
kHz
0
112.5
168.75 Degrees
2000
10,000
Ω
40
mΩ_PP
100
μA
3-V supply V_REF = (VREFP – VREFN)
5-V supply V_REF = (VREFP – VREFN)
2
2.5 VDD – 0.3
V
2
4 VDD – 0.3
V
AVSS
V
AVSS + 2.5
V
120
kΩ
4
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