Datasheet

ADS7945
ADS7946
SBAS539B –JUNE 2011– REVISED SEPTEMBER 2011 www.ti.com
ELECTRICAL CHARACTERISTICS: ADS7945 (Differential) (continued)
Minimum/maximum specifications at T
A
= –40°C to +125°C, AVDD = 2.7 V to 5.25 V, DVDD = 1.65 V to AVDD, input
common-mode = V
REF
/2 ± 0.2, and f
SAMPLE
= 2 MSPS, unless otherwise noted.
Typical specifications at T
A
= +25°C, AVDD = 5 V, DVDD = 1.8 V, input common-mode = V
REF
/2 ± 0.2, and f
SAMPLE
= 2 MSPS.
PARAMETER TEST CONDITIONS MIN TYP MAX UNITS
DIGITAL INPUT/OUTPUT
Logic family CMOS
V
IH
0.7DVDD V
V
IL
0.3DVDD V
Logic level
V
OH
SDO load 20 pF 0.8DVDD V
V
OL
SDO load 20 pF 0.2DVDD V
Input leakage current I
IH
, I
IL
0 < V
IN
< DVDD ±20 nA
External reference 2.5 AVDD V
POWER-SUPPLY REQUIREMENTS
AVDD 2.7 3.3 5.25 V
DVDD 1.65 3.3 AVDD V
AVDD = 3.3 V, f
SAMPLE
= 2 MSPS 3.5 4 mA
I
DYNAMIC
AVDD = 5 V, f
SAMPLE
= 2 MSPS 4 5 mA
AVDD supply current
AVDD = 3.3 V, SCLK off 2.3 mA
I
STATIC
AVDD = 5 V, SCLK off 2.5 3 mA
DVDD = 3.3 V, f
SAMPLE
= 2 MSPS,
DVDD supply current
(9)
750 µA
SDO load 20 pF
I
PD-DYNAMIC
SCLK = 40 MHz 550 µA
Power-down state
AVDD supply current
I
PD-STATIC
SCLK off 2.5 µA
Power-up time From power-down state using PDEN pin 1 µs
TEMPERATURE RANGE
Specified performance –40 +125 °C
(9) DVDD consumes only dynamic current. I
DVDD
= C
LOAD
× DVDD × number of 0→1 transitions in SDO × f
SAMPLE
.
This is a load-dependent current and there is no DVDD current when the output is not toggling.
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