Datasheet

ADS8331
ADS8332
SBAS363C –DECEMBER 2009–REVISED MAY 2012 www.ti.com
ELECTRICAL CHARACTERISTICS: VA = 5V (continued)
At T
A
= –40°C to +85°C, VA = 5V, VBD = 1.65V to 5V, V
REF
= 4.096V, and f
SAMPLE
= 500kSPS, unless otherwise noted.
ADS8331I, ADS8332I ADS8331IB, ADS8332IB
PARAMETER TEST CONDITIONS MIN TYP MAX MIN TYP MAX UNIT
CLOCK
Internal conversion clock
10.9 11.5 12.6 10.9 11.5 12.6 MHz
frequency
Used as I/O clock only 40 40 MHz
SCLK external serial clock
Used as both I/O clock and
1 21 1 21 MHz
conversion clock
EXTERNAL VOLTAGE REFERENCE INPUT
Input (REF+) – (REF–) 1.2 4.096 4.2 1.2 4.096 4.2 V
V
REF
reference
(REF–) – AGND –0.1 0.1 –0.1 0.1 V
range
(5)
Resistance
(6)
Reference input 20 20 kΩ
DIGITAL INPUT/OUTPUT
Logic family CMOS CMOS
1.65 < VBD < 2.5V 0.8 × VBD VBD + 0.3 0.8 × VBD VBD + 0.3 V
V
IH
High-level input voltage
2.5V ≤ VBD ≤ VA 0.65 × VBD VBD + 0.3 0.65 × VBD VBD + 0.3 V
1.65 < VBD < 2.5V –0.3 0.1 × VBD –0.3 0.1 × VBD V
V
IL
Low-level input voltage
2.5V ≤ VBD ≤ VA –0.3 0.25 × VBD –0.3 0.25 × VBD V
I
I
Input current V
IN
= VBD or DGND –1 1 –1 1 µA
C
I
Input capacitance 5 5 pF
VA ≥ VBD ≥ 1.65V,
V
OH
High-level output voltage VBD – 0.6 VBD VBD – 0.6 VBD V
I
O
= 100μA
VA ≥ VBD ≥ 1.65V,
V
OL
Low-level output voltage 0 0.4 0 0.4 V
I
O
= –100μA
C
O
SDO pin capacitance Hi-Z state 5 5 pF
C
L
Load capacitance 30 30 pF
Data format Straight binary Straight binary
POWER-SUPPLY REQUIREMENTS
VA Analog supply voltage
(5)
4.5 5 5.5 4.5 5 5.5 V
VBD Digital I/O supply voltage 1.65 VA + 0.2 1.65 VA + 0.2 V
f
SAMPLE
= 500kSPS 6.6 7.75 6.6 7.75 mA
f
SAMPLE
= 250kSPS in Auto-
4.2 4.2 mA
Nap mode
IA Analog supply current
Nap mode, SCLK = VBD or
390 500 390 500 μA
DGND
Deep PD mode, SCLK = VBD
80 250 80 250 nA
or DGND
f
SAMPLE
= 500kSPS 1.2 2.0 1.2 2.0 mA
IBD Digital I/O supply current
f
SAMPLE
= 250kSPS in Auto-
0.7 0.7 mA
Nap mode
VA = 5.0V, VBD = 5.0V,
39 48.75 39 48.75 mW
f
SAMPLE
= 500kSPS
Power dissipation
VA = 5.0V, VBD = 5.0V,
f
SAMPLE
= 250kSPS in Auto- 24.5 24.5 mW
Nap mode
TEMPERATURE RANGE
T
A
Operating free-air temperature –40 +85 –40 +85 °C
(5) The ADS8331/32 operates with VA between 2.7V and 5.5V, and V
REF
between 1.2V and VA. However, the device may not meet the
specifications listed in the Electrical Characteristics when VA is between 3.6V and 4.5V.
(6) Can vary ±30%.
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