Datasheet

ADS1255
ADS1256
SBAS288K − JUNE 2003 − REVISED SEPTEMBER 2013
www.ti.com
4
ELECTRICAL CHARACTERISTICS (continued)
All specifications at −40°C to +85°C, AVDD = +5V, DVDD = +1.8V, f
CLKIN
= 7.68MHz, PGA = 1, and V
REF
= +2.5V, unless otherwise noted.
PARAMETER UNITMAXTYPMINTEST CONDITIONS
Power-Supply
AVDD 4.75 5.25 V
DVDD 1.8 3.6 V
Power-down mode 2 μA
Standby mode 20 μA
AVDD current
Normal mode, PGA = 1, Buffer off 7 10 mA
AVDD current
Normal mode, PGA = 64, Buffer off 16 22 mA
Normal mode, PGA = 1, Buffer on 13 19 mA
Normal mode, PGA = 64, Buffer on 36 50 mA
Power-down mode 2 μA
DVDD current
Standby mode, CLKOUT off,
DVDD = 3.3V
95 μA
Normal mode, CLKOUT off,
DVDD = 3.3V
0.9 2 mA
Power dissipation
Normal mode, PGA = 1, Buffer off,
DVDD = 3.3V
38 57 mW
Power dissipation
Standby mode, DVDD = 3.3V 0.4 mW
Temperature Range
Specified −40 +85 °C
Operating −40 +105 °C
Storage −60 +150 °C
(1)
See text for more information on input impedance.
(2)
SPS = samples per second.
(3)
FSR = full-scale range = 4V
REF
/PGA.
(4)
f
CM
is the frequency of the common-mode input signal.
(5)
Placing a notch of the digital filter at 60Hz (setting f
DATA
= 60SPS, 30SPS, 15SPS, 10SPS, 5SPS, or 2.5SPS) will further improve the
common-mode rejection of this frequency.
(6)
The reference input range with Buffer on is restricted only if self-calibration or gain self-calibration is to be used. If using system calibration or
writing calibration values directly to the registers, the entire Buffer off range can be used.