Datasheet

ADS1246
ADS1247
ADS1248
SBAS426G –AUGUST 2008–REVISED OCTOBER 2011 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Minimum/maximum specifications apply from –40°C to +105°C. Typical specifications are at +25°C. All specifications at
AVDD = +5V, DVDD = +3.3V, AVSS = 0V, V
REF
= +2.048V, and oscillator frequency = 4.096MHz, unless otherwise noted.
ADS1246, ADS1247, ADS1248
PARAMETER CONDITIONS MIN TYP MAX UNIT
CURRENT SOURCES (IDACS)
Output current 50, 100, 250, 500, 750, 1000, 1500 μA
Voltage compliance All currents AVDD – 0.7 V
Initial error All currents, each IDAC –6 ±1 6 % of FS
Initial mismatch All currents, between IDACs ±0.15 % of FS
Temperature drift Each IDAC 100 ppm/°C
Temperature drift matching Between IDACs 10 ppm/°C
SYSTEM MONITORS
Voltage T
A
= +25°C 118 mV
Temperature
sensor reading
Drift 405 μV/°C
GENERAL-PURPOSE INPUT/OUTPUT (GPIO)
V
IH
0.7AVDD AVDD V
V
IL
AVSS 0.3AVDD V
Logic levels
V
OH
I
OH
= 1mA 0.8AVDD V
V
OL
I
OL
= 1mA 0.2 AVDD V
DIGITAL INPUT/OUTPUT (other than GPIO)
V
IH
0.7DVDD DVDD V
V
IL
DGND 0.3DVDD V
Logic levels
V
OH
I
OH
= 1mA 0.8DVDD V
V
OL
I
OL
= 1mA DGND 0.2 DVDD V
Input leakage DGND < V
IN
< DVDD ±10 μA
Frequency 1 4.5 MHz
Clock input
(CLK)
Duty cycle 25 75 %
Internal oscillator frequency 3.89 4.096 4.3 MHz
POWER SUPPLY
DVDD 2.7 5.25 V
AVSS –2.5 0 V
AVDD AVSS + 2.7 AVSS + 5.25 V
Normal mode, DVDD = 5V,
230 μA
data rate = 20SPS, internal oscillator
DVDD current Normal mode, DVDD = 3.3V,
210 μA
data rate = 20SPS, internal oscillator
Sleep mode 0.2 µA
Converting, AVDD = 5V,
225 µA
data rate = 20SPS, external reference
Converting, AVDD = 3.3V,
200 µA
data rate = 20SPS, external reference
AVDD current
Sleep mode 0.1 µA
Additional current with internal reference
180 μA
enabled
AVDD = DVDD = 5V,
data rate = 20SPS, internal oscillator, 2.3 mW
external reference
Power dissipation
AVDD = DVDD = 3.3V,
data rate = 20SPS, internal oscillator, 1.4 mW
external reference
TEMPERATURE RANGE
Specified –40 +105 °C
Operating –40 +125 °C
Storage –60 +150 °C
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