Datasheet
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.
ADS1291, ADS1292, ADS1292R
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
DIGITAL FILTER
–3-dB bandwidth 0.262 f
DR
Hz
Digital filter settling Full setting 4 Conversions
RIGHT LEG DRIVE (RLD) AMPLIFIER
RLD integrated noise BW = 150 Hz 1.4 μV
RMS
GBP Gain bandwidth product 50 kΩ || 10 pF load, gain = 1 100 kHz
SR Slew rate 50 kΩ || 10 pF load, gain = 1 0.07 V/μs
THD Total harmonic distortion f
IN
= 100 Hz, gain = 1 –85 dB
CMIR Common-mode input range AVSS + 0.3 AVDD – 0.3 V
Common-mode resistor matching Internal 200-kΩ resistor matching 0.1 %
I
SC
Short-circuit current 1.1 mA
Quiescent power consumption 5 μA
LEAD-OFF DETECT
Frequency See Register Map section for settings 0, f
DR
/ 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 I
RESP
= 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 mΩ
PP
using I
RESP
= 30 µA with 2-kΩ baseline load,
gain = 4
Maximum modulator current Using Internal reference 100 μA
EXTERNAL REFERENCE
3-V supply V
REF
= (VREFP – VREFN) 2 2.5 VDD – 0.3 V
Reference input voltage
5-V supply V
REF
= (VREFP – VREFN) 2 4 VDD – 0.3 V
VREFN Negative input AVSS V
VREFP Positive input AVSS + 2.5 V
Input impedance 120 kΩ
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