ADS7947 Datasheet, PDF (6/38 Pages) Texas Instruments – 12/10/8-Bit 2MSPS, Dual-Channel Unipolar Pseudo-Differential Ultralow-Power SAR Analog-to-Digital Converters

ADS7947
ADS7948
ADS7949
SLAS708 – SEPTEMBER 2010
www.ti.com
ELECTRICAL CHARACTERISTICS: ADS7948 (10-Bit) (continued)
Minimum/maximum specifications at AVDD = 2.7V to 5.5V, DVDD = 1.65V to AVDD, T_A = –40°C to +125°C, and
f_SAMPLE = 2MSPS, unless otherwise noted. Typical specifications at AVDD = 3V, DVDD = 1.8V, T_A = +25°C, and f_SAMPLE =
2MSPS.
PARAMETER
TEST CONDITIONS
MIN TYP
MAX UNITS
POWER-SUPPLY REQUIREMENTS
AVDD
2.7
3.3
5.5 V
DVDD
1.65
3.3
AVDD V
AVDD supply current
I_DYNAMIC
I_STATIC
AVDD = 3.3V, f_SAMPLE = 2MSPS
AVDD = 5V, f_SAMPLE = 2MSPS
AVDD = 3.3V, SCLK off
AVDD = 5V, SCLK off
2.5
mA
3
3.5 mA
1.8
mA
1.9
2.5 mA
DVDD supply current⁽⁶⁾
DVDD = 3.3V, SCLK = 34MHz,
SDO load 20pF
500
µA
Power-down state
AVDD supply current
Power-up time
I_PD-DYNAMIC
I_PD-STATIC
SCLK = 34MHz
SCLK off
550 µA
2.5 µA
1 µs
TEMPERATURE RANGE
Specified performance
–40
+125 °C
(6) 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.
6
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