
AD7156
Rev. 0 | Page 3 of 28
SPECIFICATIONS
VDD = 1.8 V to 3.6 V, GND = 0 V, temperature range = 40°C to +85°C, unless otherwise noted.
Table 1.
Parameter
Min
Typ
Max
Test Conditions/Comments
CAPACITIVE INPUT
Conversion Input Range, CIN to
EXC2, 33.2
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
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
Maximum Allowed Capacitance, CIN to
GND4, 650
pF
Minimum Allowed Resistance, CIN to
GND4, 610
MΩ
50
kΩ
Gain Error
20
+20
%
Gain Deviation over Temperatu
re40.5
%FSR
Gain Matching Between Ra
nges42
+2
%
50
fF
CIN and EXC pins disconnected
Offset Deviation over Tempera
ture45
fF
CIN and EXC pins disconnected
Integral Nonlinearity (
INL)40.05
%
Channel-to-Channel Isolat
ion460
dB
4
fF/V
CAPDAC
Full Range
10
12.5
pF
200
fF
Differential Nonlinearity
(DNL)40.25
LSB
Auto-DAC Increment/Decremen
t4, 725
75
% of CIN range
EXCITATION
±VDD/2
V
Frequency
16
kHz
Maximum Allowed Capacitance EXC to GN
D4, 61000
pF
Minimum Allowed Resistance EXC to
GND4, 61
MΩ
LOGIC OUTPUTS (OUT1, OUT2)
Output Low Voltage (VOL)
0.4
V
ISINK = 3 mA
Output High Voltage (VOH)
VDD – 0.6
V
ISOURCE = +3 mA
SERIAL INTERFACE INPUTS (SCL, SDA)
Input High Voltage (VIH)
70
% of VDD
Input Low Voltage (VIL)
25
% of VDD
Input Leakage Current
±0.1
±5
μA
Input Pin Capacitance
6
pF
OPEN-DRAIN OUTPUT (SDA)
Output Low Voltage (VOL)
0.4
V
ISINK =
6.0 mA
Output High Leakage Current (IOH)
0.1
5
μA
VOUT = VDD