Datasheet

AD7291 Data Sheet
Rev. C | Page 4 of 28
Parameter Min Typ Max Unit
1
Test Conditions/Comments
Floating State Leakage Current ±0.01 ±1 µA
Floating State Output Capacitance
3
8 pF
TEMPERATURE SENSOR—INTERNAL
Operating Range −40 +125 °C
Accuracy ±1 ±2 °C T
A
= −40°C to +85°C
±1 ±3 °C T
A
= 85°C to 125°C
Resolution 0.25 °C LSB size
CONVERSION RATE
Conversion Time 3.2 μs
Autocycle Update Rate
6
50 μs
Throughput Rate
22.22
kSPS
f
SCL
= 400 kHz
POWER REQUIREMENTS Digital inputs = 0 V or V
DRIVE
V
DD
2.8 3 3.6 V
V
DRIVE
1.65 3 3.6 V
I
TOTAL
7, 8
Normal Mode (Operational) 2.9 3.5 mA
Normal Mode (Static) 2.9 3.3 mA
Full Power-Down Mode 0.3 1.6 μA T
A
= −40°C to +25°C
1.6 4.5 μA T
A
= >25°C to 85°C
4.9 12 μA T
A
= >85°C to 125°C
Power Dissipation
8
Normal Mode (Operational) 8.7 10.5 mW V
DD
= 3 V, V
DRIVE
= 3 V
10.4 12.6 mW
Normal Mode (Static) 10.4 11.9 mW
Full Power-Down Mode
1.1
5.8
µW
T
A
= −40°C to +25°C
5.8 16.2 µW T
A
= >25°C to 85°C
17.6 43.2 µW T
A
= >85°C to 125°C
1
All specifications expressed in decibels are referred to full-scale input, FSR, and tested with an input signal at 0.5 dB below full scale, unless otherwise specified.
2
See the Terminology section.
3
Sample tested during initial release to ensure compliance.
4
Refers to Pin V
REF
specified for 25
o
C.
5
A correction factor can be required on the temperature sensor results when using an external V
REF
(see the Temperature Sensor Averaging section).
6
Sampled during initial release to ensure compliance; not subject to production testing.
7
I
TOTAL
is the total current flowing in V
DD
and V
DRIVE
.
8
I
TOTAL
and power dissipation are specified with V
DD
= V
DRIVE
= 3.6 V, unless otherwise noted.