Datasheet

ADS1258
SBAS297G –JUNE 2005– REVISED MARCH 2011 www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
All specifications at T
A
= –40°C to +105°C, AVDD = +2.5V, AVSS = –2.5V, DVDD = +3.3V, V
REF
= +4.096V, VREFN = –2.5V,
f
CLK
= 16MHz (external clock) or f
CLK
= 15.729MHz (internal clock), and OPA227 buffer between MUX outputs and ADC
inputs, unless otherwise noted.
ADS1258
TEST
PARAMETER CONDITIONS MIN TYP MAX UNIT
DIGITAL INPUT/OUTPUT
V
IH
0.7DVDD DVDD V
V
IL
DGND 0.3DVDD V
Logic Levels
V
OH
I
OH
= 2mA 0.8DVDD DVDD V
V
OL
I
OL
= 2mA DGND 0.2DVDD V
Input Leakage V
IN
= DVDD, GND 10 μA
Frequency 0.1 16 MHz
Master Clock Input (CLKIO)
Duty Cycle 40 60 %
Crystal Frequency 32.768 kHz
Clock Output Frequency 15.729 MHz
Crystal Oscillator
(see Crystal Oscillator section)
Start-Up Time (Clock Output Valid) 150 mS
Clock Output Duty Cycle 40 60 %
POWER SUPPLY
DVDD 2.7 5.25 V
AVSS –2.6 0 V
AVDD AVSS + 4.75 AVSS + 5.25 V
External Clock
0.25 0.6 mA
Operation
Internal Oscillator
Operation, Clock 0.04 mA
Output Disabled
DVDD Supply Current
Internal Oscillator
Operation, Clock 1.4 mA
Output Enabled
(6)
Power-Down
(7)
1 25 µA
Converting 8.2 12 mA
Standby 5.6 mA
AVDD, AVSS Supply Current
Sleep 2.1 mA
Power-Down 2 85 µA
Converting 42 62 mW
Standby 29 mW
Power Dissipation
Sleep 11 mW
Power-Down 14 μW
(6) CLKIO load = 20pF.
(7) No clock applied to CLKIO.
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