ADS1291
ADS1292
ADS1292R
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SBAS502A –DECEMBER 2011–REVISED MARCH 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), VREF = 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
INTERNAL REFERENCE
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Register bit CONFIG2.VREF_4V = 0
Register bit CONFIG2.VREF_4V = 1
Available for external use
2.42
4.033
100
V
V
Output voltage
Output current drive
VREF accuracy
µA
±0.5
45
%
Internal reference drift
–40°C ≤ TA ≤ +85°C
ppm/°C
Settled to 0.2% with 10-µF capacitor on
VREFP pin
Start-up time
100
20
ms
µA
Quiescent current consumption
SYSTEM MONITORS
Analog supply reading error
Digital supply reading error
1
1
%
%
From power-supply ramp after power-on
reset (POR) to DRDY low
32
ms
Device wake up
From power-down mode to DRDY low
From STANDBY mode to DRDY low
1% accuracy
10
10
ms
ms
VCAP1 settling time
0.5
145
490
s
Voltage
Coefficient
TA = +25°C
mV
μV/°C
Temperature sensor
reading
TEST SIGNAL
Signal frequency
Signal voltage
Accuracy
See Register Map section for settings
See Register Map section for settings
At dc and 1 Hz
Hz
mV
%
±1
±2
CLOCK
Internal oscillator clock frequency
Internal clock accuracy
Nominal frequency
TA = +25°C
512
kHz
%
±0.5
±1.5
–40°C ≤ TA ≤ +85°C
%
Internal oscillator start-up time
32
30
μs
Internal oscillator power consumption
μW
kHz
MHz
CLKSEL pin = 0, CLK_DIV = 0
CLKSEL pin = 0, CLK_DIV = 1
485
512
562.5
2.25
External clock input frequency
1.94
2.048
DIGITAL INPUT/OUTPUT
DVDD = 1.8 V to
3.6 V
VIH
0.8 DVDD
–0.1
DVDD + 0.1
0.2 DVDD
V
V
V
V
V
DVDD = 1.8 V to
3.6 V
VIL
VIH
DVDD = 1.7 V to
1.8 V
DVDD – 0.2
Logic level
VIL
DVDD = 1.7 V to
1.8 V
0.2
DVDD = 1.7 V to
3.6 V
VOH
IOH = –500 μA
0.9 DVDD
–10
DVDD = 1.7 V to
3.6 V
VOL
IIN
IOL = +500 μA
0.1 DVDD
+10
V
Input current
0 V < VDigitalInput < DVDD
μA
POWER-SUPPLY REQUIREMENTS
AVDD
DVDD
Analog supply
Digital supply
AVDD – DVDD
AVDD – AVSS
DVDD – DGND
2.7
1.7
3
5.25
3.6
V
V
V
1.8
–2.1
3.6
Copyright © 2011–2012, Texas Instruments Incorporated
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