Datasheet

ADS1281
SBAS378D –AUGUST 2007–REVISED JUNE 2010 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Limit specifications at –40°C to +85°C, typical specifications at +25°C, AVDD = +2.5V, AVSS = –2.5V, f
CLK
(1)
= 4.096MHz,
VREFP = +2.5V, VREFN = –2.5V, DVDD = +3.3V, and f
DATA
= 1000SPS, unless otherwise noted.
ADS1281
PARAMETER CONDITIONS MIN TYP MAX UNIT
VOLTAGE REFERENCE INPUTS
Reference input voltage (AVDD – AVSS)
0.5 5 V
V
REF
= VREFP – VREFN + 0.2
Negative reference input VREFN AVSS – 0.1 VREFP – 0.5 V
Positive reference input VREFP VREFN + 0.5 AVDD + 0.1 V
Reference input impedance 85 kΩ
DIGITAL INPUT/OUTPUT
V
IH
0.8 × DVDD DVDD V
V
IL
DGND 0.2 × DVDD V
V
OH
I
OH
= 1mA 0.8 × DVDD V
V
OL
I
OL
= 1mA 0.2 × DVDD V
Input leakage 0 < V
DIGITAL IN
< DVDD ±10 mA
Clock input f
CLK
1 4.096 MHz
POWER SUPPLY
AVSS –2.6 0 V
AVDD AVSS + 4.75 AVSS + 5.25 V
DVDD 1.65 3.6 V
Operating mode 2 3 | mA |
AVDD, AVSS current Standby mode 1 15 | mA |
Power-Down mode 1 15 | mA |
Operating mode 0.6 0.8 mA
Modulator mode 0.1 mA
DVDD current
Standby mode 25 50 mA
Power-Down mode
(9)
1 15 mA
Operating mode 12 18 mW
Power dissipation Standby mode 90 250 mW
Power-Down mode 10 150 mW
(9) CLK input stopped.
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