Datasheet
ADS1294, ADS1294R
ADS1296, ADS1296R
ADS1298, ADS1298R
www.ti.com
SBAS459I –JANUARY 2010–REVISED JANUARY 2012
ELECTRICAL CHARACTERISTICS (continued)
Minimum/maximum specifications apply for all commercial grade (0°C to +70°C) devices and from –40°C to +85°C for
industrial grades devices. Typical specifications are at +25°C. All specifications at DVDD = 1.8V, AVDD – AVSS = 3V
(1)
,
V
REF
= 2.4V, external f
CLK
= 2.048MHz, data rate = 500SPS, High-Resolution mode, and gain = 6, unless otherwise noted.
ADS1294, ADS1296, ADS1298
ADS1294R, ADS1296R, ADS1298R
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
LEAD-OFF DETECT
Frequency See the Register Map section for settings 0, f
DR
/4 kHz
Current See the Register Map section for settings 6, 12, 18, 24 nA
Current accuracy ±20 %
Comparator threshold accuracy ±30 mV
RESPIRATION (ADS1294R/6R/8R Only)
Internal source 32, 64 kHz
Frequency
External source 32 64 kHz
Phase shift See the Register Map section for settings 22.5 90 157.5 Degrees
Impedance range I
RESP
= 30μA 10 kΩ
0.05Hz to 2Hz brick wall filter, 32kHz
modulation clock, phase = 112.5,
Impedance measurement noise 20 mΩ
PP
using I
RESP
= 30μA with 2kΩ baseline load,
gain = 4 test condition
internal reference, signal path = 82kΩ,
Modulator current 29 µA
baseline = 2.21kΩ
EXTERNAL REFERENCE
3V supply V
REF
= (VREFP – VREFN) 2.5 V
Reference input voltage
5V supply V
REF
= (VREFP – VREFN) 4.0 V
Negative input (VREFN) AVSS V
Positive input (VREFP) AVSS + 2.5 V
Input impedance 10 kΩ
INTERNAL REFERENCE
Register bit CONFIG3.VREF_4V = 0,
2.4 V
AVDD ≥ 2.7V
Output voltage
Register bit CONFIG3.VREF_4V = 1,
4.0 V
AVDD ≥ 4.4V
V
REF
accuracy ±0.2 %
T
A
= +25°C 35 ppm/°C
Internal reference drift Commerical grade, 0°C to +70°C 35 ppm
Industrial grade, –40°C to +85°C 45 ppm
Start-up time 150 ms
SYSTEM MONITORS
Analog supply reading error 2 %
Digital supply reading error 2 %
From power-up to DRDY low 150 ms
Device wake up
STANDBY mode 9 ms
Temperature sensor reading, voltage T
A
= +25°C 145 mV
Temperature sensor reading, coefficient 490 μV/°C
Test Signal
Signal frequency See Register Map section for settings Hz
f
CLK
/2
21
, f
CLK
/2
20
Signal voltage See Register Map section for settings ±1, ±2 mV
Accuracy ±2 %
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