Datasheet

ADS131E04
ADS131E06
ADS131E08
SBAS561A –JUNE 2012–REVISED APRIL 2013 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Minimum and maximum specifications apply from –40°C to +105°C. Typical specifications are at +25°C. All specifications are
at DVDD = 1.8 V, AVDD = 3 V, AVSS = 0 V, V
REF
= 2.4 V, external f
CLK
= 2.048 MHz, data rate = 8 kSPS, and gain = 1,
unless otherwise noted.
ADS131E0x
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
OPERATIONAL AMPLIFIER
Integrated noise 0.1 Hz to 250 Hz 9 µV
RMS
Noise density 2 kHz 120 nV/√Hz
GBP Gain bandwidth product 50 kΩ || 10-pF load 100 kHz
SR Slew rate 50 kΩ || 10-pF load 0.25 V/µs
Load current 50 µA
THD Total harmonic distortion f
IN
= 100 Hz 70 dB
AVSS + AVDD –
CMIR Common-mode input range V
0.7 0.3
Quiescent power consumption 20 µA
INTERNAL REFERENCE
T
A
= +25°C, V
REF
= 2.4 V 2.394 2.4 2.406 V
V
O
Output voltage
T
A
= +25°C, V
REF
= 4 V 4 V
V
REF
accuracy ±0.2 %
Temperature drift –40°C ≤ T
A
≤ +105°C 20 ppm/°C
Start-up time Settled to 0.2% 150 ms
SYSTEM MONITORS
Analog 2 %
Supply reading
error
Digital 2 %
From power-up to DRDY low 150 ms
Device wake up
STANDBY mode 31.25 µs
Voltage T
A
= +25°C 145 mV
Temperature
sensor reading
Coefficient 490 μV/°C
SELF-TEST SIGNAL
Hz
f
CLK
/ 2
21
Signal frequency See Register Map section for settings
Hz
f
CLK
/ 2
20
±1 mV
Signal voltage See Register Map section for settings
±2 mV
Accuracy ±2 %
CLOCK
Nominal frequency 2.048 MHz
Internal oscillator clock frequency T
A
= +25°C ±0.5 %
–40°C ≤ T
A
≤ +105°C 2.5 %
Internal oscillator start-up time 20 μs
Internal oscillator power
120 μW
consumption
CLKSEL pin = 0, AVDD = 3 V 1.7 2.048 2.25 MHz
External clock input frequency
CLKSEL pin = 0, AVDD = 5 V 0.7 2.048 2.25 MHz
DIGITAL INPUT AND OUTPUT (DVDD = 1.8 V to 3.6 V)
DVDD +
V
IH
High 0.8 DVDD V
Logic level,
0.1
input voltage
V
IL
Low –0.1 0.2 DVDD V
V
OH
High I
OH
= –500 µA 0.9 DVDD V
Logic level,
output voltage
V
OL
Low I
OL
= +500 µA 0.1 DVDD V
I
IN
Input current 0 V < V
DigitalInput
< DVDD –10 +10 μA
POWER-SUPPLY REQUIREMENTS
AVDD Analog supply AVDD – AVSS 2.7 3 5.25 V
DVDD Digital supply 1.8 1.8 3.6 V
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