Datasheet

ADS1174
ADS1178
SBAS373B – OCTOBER 2007 – REVISED SEPTEMBER 2008 ........................................................................................................................................ www.ti.com
ELECTRICAL CHARACTERISTICS (continued)
Limit specifications at T
A
= – 40 ° C to +105 ° C. Typical specifications at T
A
= +25 ° C, AVDD = +5V, DVDD = +1.8V, IOVDD =
+3.3V, f
CLK
= 27MHz, VREFP = 2.5V, VREFN = 0V, and all channels active, unless otherwise noted.
ADS1174, ADS1178
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
VOLTAGE REFERENCE INPUTS
Reference input voltage (V
REF
) V
REF
= VREFP – VREFN 0.5 2.5 3.1 V
Negative reference input (VREFN) AGND – 0.1 AGND + 0.1 V
Positive reference input (VREFP) VREFN + 0.5 VREFN + 3.1 V
High-Speed mode 2.6 k Ω
ADS1174
Reference Input impedance
Low-Power mode 13 k Ω
High-Speed mode 1.3 k Ω
ADS1178
Reference Input impedance
Low-Power mode 6.5 k Ω
DIGITAL INPUT/OUTPUT (IOVDD = 1.8V to 3.6V)
V
IH
0.7 IOVDD IOVDD V
V
IL
DGND 0.3 IOVDD V
V
OH
I
OH
= 4mA 0.8 IOVDD IOVDD V
V
OL
I
OL
= 4mA DGND 0.2 IOVDD V
Input leakage 0 < V
IN DIGITAL
< IOVDD ± 10 µ A
Master clock rate (f
CLK
) 0.1 27 MHz
POWER SUPPLY
AVDD 4.75 5 5.25 V
DVDD 1.65 1.8 1.95 V
IOVDD 1.65 3.6 V
AVDD 1 10 µ A
Power-down current DVDD 1 15 µ A
IOVDD 1 10 µ A
ADS1174
High-Speed mode 23 35 mA
ADS1174
AVDD current
Low-Power mode 5 9 mA
High-Speed mode 10 15 mA
ADS1174
DVDD current
Low-Power mode 2.5 4.5 mA
High-Speed mode 0.075 0.3 mA
ADS1174
IOVDD current
Low-Power mode 0.02 0.15 mA
High-Speed mode 135 210 mW
ADS1174
Power dissipation
Low-Power mode 30 55 mW
ADS1178
High-Speed mode 44 64 mA
ADS1178
AVDD current
Low-Power mode 9 14 mA
High-Speed mode 12 17 mA
ADS1178
DVDD current
Low-Power mode 3 4.5 mA
High-Speed mode 0.125 0.5 mA
ADS1178
IOVDD current
Low-Power mode 0.035 0.2 mA
High-Speed mode 245 355 mW
ADS1178
Power dissipation
Low-Power mode 50 80 mW
4 Submit Documentation Feedback Copyright © 2007 – 2008, Texas Instruments Incorporated
Product Folder Link(s): ADS1174 ADS1178