Datasheet

AD7151
Rev. 0 | Page 3 of 28
SPECIFICATIONS
V
DD
= 2.7 V to 3.6 V; GND = 0 V; –40°C to +85°C, single-ended capacitance mode, unless otherwise noted.
Table 1.
Parameter Min Typ Max Unit
1
Test Conditions/Comments
CAPACITIVE INPUT
Conversion Input Range CIN to EXC
2
3.2 4 pF 4 pF input range
1.6 2 pF 2 pF input range
0.8 1 pF 1 pF input range
0.4 0.5 pF 0.5 pF input range
Resolution
3
2.0 fF 4 pF input range
1.6 fF 2 pF input range
1.4 fF 1 pF input range
1.0 fF 0.5 pF input range
Allowed Capacitance CIN to GND
3
150 pF
Allowed Resistance CIN to GND
3
15 MΩ
Allowed Serial Resistance
3
200 kΩ
Gain Error −20 +20 %
Gain Deviation over Temperature
3
0.5 %
Gain Matching Between Ranges
3
−2 +2 %
Offset Error
3
50 fF CIN and EXC pins disconnected
Offset Deviation over Temperature
3
5 fF CIN and EXC pins disconnected
Integral Nonlinearity (INL)
3
0.1 %
Power Supply Rejection
3
4 fF/V
CAPDAC
2
Full Range 10 12.5 pF
Resolution (LSB)
3
200 fF
Differential Nonlinearity (DNL)
3
0.25 LSB
AutoDAC Increment/Decrement
3
25 75 % of C
IN
Range
EXCITATION
Voltage ±V
DD
/2 V
Frequency 15.4 16 16.3 kHz
Allowed Capacitance EXC to GND
3
300 pF
Allowed Resistance EXC to GND
3
1 MΩ
LOGIC OUTPUT (OUT)
Output Low Voltage (V
OL
) 0.4 V I
SINK
= −4 mA
Output High Voltage (V
OH
) V
DD
– 0.6 V I
SOURCE
= 4 mA
SERIAL INTERFACE INPUTS (SCL, SDA)
Input High Voltage (V
IH
) 1.5 V
Input Low Voltage (V
IL
) 0.8 V
Input Leakage Current ±0.1 ±5 μA
Input Pin Capacitance 6 pF
OPEN-DRAIN OUTPUT (SDA)
Output Low Voltage (V
OL
) 0.4 V
I
SINK
= −6.0 mA
Output High Leakage Current (I
OH
) 0.1 5 μA V
OUT
= V
DD
POWER SUPPLY MONITOR
V
DD
Threshold Voltage 2.45 2.65 V