AD7746 Просмотр технического описания (PDF) - Analog Devices
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AD7746 Datasheet PDF : 28 Pages
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AD7745/AD7746
SPECIFICATIONS
VDD = 2.7 V to 3.6 V or 4.75 V to 5.25 V; GND = 0 V; EXC = 32 kHz; EXC = ±VDD/2; –40°C to +125°C, unless otherwise noted.
Table 1.
Parameter
CAPACITIVE INPUT
Conversion Input Range
Integral Nonlinearity (INL)2
No Missing Codes2
Resolution, p-p
Resolution Effective
Output Noise, rms
Absolute Error3
Offset Error2, 4
System Offset Calibration Range2
Offset Drift vs. Temperature
Gain Error5
Gain Drift vs. Temperature2
Allowed Capacitance to GND2
Power Supply Rejection
Normal Mode Rejection
Channel-to-Channel Isolation
CAPDAC
Full Range
Resolution6
Drift vs. Temperature2
EXCITATION
Frequency
Voltage Across Capacitance
Average DC Voltage Across
Capacitance
Allowed Capacitance to GND2
TEMPERATURE SENSOR7
Resolution
Error2
VOLTAGE INPUT7
Differential VIN Voltage Range
Absolute VIN Voltage2
Integral Nonlinearity (INL)
No Missing Codes2
Resolution, p-p
Output Noise
Offset Error
Offset Drift vs. Temperature
Full-Scale Error2, 9
Min
Typ
Max
Unit
Test Conditions/Comments
±4.096
pF1
Factory calibrated
±0.01
% of FSR
24
Bit
Conversion time ≥ 62 ms
16.5
Bit
Conversion time = 62 ms, see Table 5
19
Bit
Conversion time = 62 ms, see Table 5
2
aF/√Hz
See Table 5
±4
fF1
25°C, VDD = 5 V, after offset calibration
32
aF1
After system offset calibration,
Excluding effect of noise4
±1
pF
–1
aF/°C
0.02
0.08
% of FS
25°C, VDD = 5 V
–28
–26
–24
ppm of FS/°C
60
pF
See Figure 9 and Figure 10
0.3
1
fF/V
65
dB
50 Hz ± 1%, conversion time = 62 ms
55
dB
60 Hz ± 1%, conversion time = 62 ms
70
dB
AD7746 only
17
21
pF
164
fF
7-bit CAPDAC
24
26
28
ppm of FS/°C
32
kHz
±VDD/8
V
±VDD/4
V
±VDD × 3/8
V
±VDD/2
V
<±40
mV
100
pF
0.1
°C
±0.5
±2
°C
±2
°C
GND − 0.03
24
±VREF
±3
16
3
±3
15
0.025
VDD + 0.03
±15
V
V
ppm of FS
Bit
Bits
µV rms
µV
nV/°C
0.1
% of FS
Configurable via digital interface
See Figure 11
VREF internal
Internal temperature sensor
External sensing diode8
VREF internal or VREF = 2.5 V
Conversion time = 122.1 ms
Conversion time = 62 ms
See Table 6 and Table 7
Conversion time = 62 ms
See Table 6 and Table 7
Rev. 0| Page 3 of 28
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