ADS1291_14 Datasheet, PDF (5/75 Pages) Texas Instruments – Power, 2-Channel, 24-Bit Analog Front-End for Biopotential Measurements

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ADS1291
ADS1292
ADS1292R
SBAS502B – DECEMBER 2011 – REVISED SEPTEMBER 2012
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
INTERNAL REFERENCE
Output voltage
Output current drive
V_REF accuracy
Internal reference drift
Start-up time
Quiescent current consumption
SYSTEM MONITORS
Analog supply reading error
Digital supply reading error
Device wake up
VCAP1 settling time
Temperature sensor
reading
Voltage
Coefficient
TEST SIGNAL
Signal frequency
Signal voltage
Accuracy
CLOCK
Internal oscillator clock frequency
Internal clock accuracy
Internal oscillator start-up time
Internal oscillator power consumption
External clock input frequency
DIGITAL INPUT/OUTPUT
V_IH
DVDD = 1.8 V to
3.6 V
V_IL
DVDD = 1.8 V to
3.6 V
V_IH
DVDD = 1.7 V to
1.8 V
V_IL
Logic level
DVDD = 1.7 V to
1.8 V
V_OH
DVDD = 1.7 V to
3.6 V
V_OL
DVDD = 1.7 V to
3.6 V
I_IN
Input current
POWER-SUPPLY REQUIREMENTS
AVDD Analog supply
AVDD – AVSS
DVDD Digital supply
DVDD – DGND
AVDD – DVDD
TEST CONDITIONS
Register bit CONFIG2.VREF_4V = 0
Register bit CONFIG2.VREF_4V = 1
Available for external use
–40°C ≤ T_A ≤ +85°C
Settled to 0.2% with 10-µF capacitor on
VREFP pin
From power-supply ramp after power-on
reset (POR) to DRDY low
From power-down mode to DRDY low
From STANDBY mode to DRDY low
1% accuracy
T_A = +25°C
See Register Map section for settings
See Register Map section for settings
Nominal frequency
T_A = +25°C
–40°C ≤ T_A ≤ +85°C
CLKSEL pin = 0, CLK_DIV = 0
CLKSEL pin = 0, CLK_DIV = 1
I_OH = –500 μA
I_OL = +500 μA
0 V < V_DigitalInput < DVDD
ADS1291, ADS1292, ADS1292R
MIN
TYP
MAX
UNIT
2.42
4.033
100
±0.5
45
100
20
V
V
µA
%
ppm/°C
ms
µA
1
%
1
%
32
ms
10
ms
10
ms
0.5
s
145
mV
490
μV/°C
At dc and 1 Hz
Hz
±1
mV
±2
%
512
kHz
±0.5
%
±1.5
%
32
μs
30
μW
485
512
562.5
kHz
1.94
2.048
2.25
MHz
0.8 DVDD
–0.1
DVDD – 0.2
0.9 DVDD
–10
2.7
1.7
–2.1
DVDD + 0.1
V
0.2 DVDD
V
V
0.2
V
V
0.1 DVDD
V
+10
μA
3
5.25
V
1.8
3.6
V
3.6
V
Copyright © 2011–2012, Texas Instruments Incorporated
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