EVAL-AD7152EBZ View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-AD7152EBZ' PDF : 24 Pages View PDF
AD7152/AD7153
Data Sheet
The offset register of the AD7152/AD7153 allows for offset
calibration over the full capacitive input range. However, the
user must ensure that the offset to be removed is within 40% of
the full scale range; this can be achieved by using the CAPCAC
to perform a coarse offset calibration and use the system offset
calibration then to compensate for an offset within the 40% of
full-scale range pF of the CAPDAC.
The offset calibration register is reloaded by the default value
0x8000 at power-on or after reset. Therefore, if the offset
calibration is not repeated after each system power-up, the
calibration coefficient value should be stored by the host
controller and reloaded as part of the AD7152/AD7153 setup.
Note that the AD7152/AD7153 zero scale for differential mode
is around 0x8000; therefore, the offset register also needs a
value of around 0x8000, where the zero scale in single-ended
mode is 0x0000, with a required offset register value of 0x3000.
For more detailed information, see the Data Registers section.
TYPICAL APPLICATION DIAGRAM
R1
R2 CIN1(+)
C1
C2
CSENS1
R3
R4
C3
CSENS2
CIN1(–)
C4
0.1µF
VDD
1kΩ
10µF
3.3V
ADP1720-3.3
1µF
AD7153
1kΩ 1kΩ
SDA
SCL
HOST
SYSTEM
GND
10kΩ
EXC1
47pF
GND
Figure 41. Basic Application Diagram for a Differential Capacitive Sensor
VSUPPLY
1µF
Rev. A | Page 22 of 24
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