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AD7747 Datasheet(PDF) 3 Page - Analog Devices

Part # AD7747
Description  24-Bit Capacitance-to-Digital Converter with Temperature Sensor
PDF  20 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD7747 Datasheet(HTML) 3 Page - Analog Devices

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Preliminary Technical Data
AD7747
Rev. PrC| Page 3 of 20
SPECIFICATIONS
VDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V; GND = 0 V; EXC = ±VDD/2; –40°C to +125°C, unless otherwise noted.
Table 1.
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
CAPACITIVE INPUT
Conversion Input Range
±8.192
pF1
Factory calibrated
Integral Nonlinearity (INL)2
±0.01
% of FSR
No Missing Codes2
24
Bit
Conversion time ≥ 124 ms
Resolution, p-p
16
Bit
Conversion time 124 ms, see Table 5
Resolution Effective
18.5
Bit
Conversion time 124 ms, see Table 5
Output Noise, rms
15
aF/
√Hz
See Table 5
Absolute Error3
±8
fF1
25°C, VDD = 5 V, after offset calibration
Offset Error2, 4
TBD
aF1
After system offset calibration,
Excluding effect of noise4
System Offset Calibration Range2
TBD
pF
Offset Drift vs. Temperature
TBD
aF/°C
Gain Error5
TBD
% of FS
25°C, VDD = 5 V
Gain Drift vs. Temperature2
–26
ppm of FS/°C
Power Supply Rejection
TBD
fF/V
Normal Mode Rejection
TBD
dB
50 Hz ± 1%, conversion time 124 ms
TBD
dB
60 Hz ± 1%, conversion time 124 ms
CAPDAC
Full Range
17
21
pF
Resolution6
330
fF
6-bit CAPDAC
Drift vs. Temperature2
26
ppm of FS/°C
EXCITATION
Frequency
16
kHz
AC Voltage Across Capacitance
±VDD/2
V
Configurable via digital interface
Average DC Voltage Across
Capacitance
TBD
mV
ACTIVE SHIELDING
Allowed Capacitance to GND2
50
pF
SHLD pin
TEMPERATURE SENSOR7
VREF internal
Resolution
0.1
°C
Error2
±0.5
±2
°C
Internal temperature sensor
±2
°C
External sensing diode8
VOLTAGE INPUT7
VREF internal or VREF = 2.5 V
Differential VIN Voltage Range
±VREF
V
Absolute VIN Voltage2
GND − 0.03
VDD + 0.03
V
Integral Nonlinearity (INL)
±3
±15
ppm of FS
No Missing Codes2
24
Bit
Conversion time = 122.1 ms
Resolution, p-p
16
Bits
Conversion time = 62 ms
See Table 6 and Table 7
Output Noise
3
µV rms
Conversion time = 62 ms
See Table 6 and Table 7
Offset Error
±3
µV
Offset Drift vs. Temperature
15
nV/°C
Full-Scale Error2, 9
0.025
0.1
% of FS
Full-Scale Drift vs. Temperature
5
ppm of FS/°C
Internal reference
0.5
ppm of FS/°C
External reference



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