參數(shù)資料
型號(hào): AD7745ARUZ-REEL7
廠商: ANALOG DEVICES INC
元件分類: 溫度/濕度傳感器
英文描述: 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
中文描述: DIGITAL TEMP SENSOR-SERIAL, 24BIT(s), 2Cel, RECTANGULAR, SURFACE MOUNT
封裝: LEAD FREE, MO-153-AB, TSSOP-16
文件頁數(shù): 3/28頁
文件大?。?/td> 391K
代理商: AD7745ARUZ-REEL7
AD7745/AD7746
SPECIFICATIONS
V
DD
= 2.7 V to 3.6 V or 4.75 V to 5.25 V; GND = 0 V; EXC = 32 kHz; EXC = ±V
DD
/2; –40°C to +125°C, unless otherwise noted.
Table 1.
Parameter
Min
Typ
CAPACITIVE INPUT
Conversion Input Range
±4.096
Integral Nonlinearity (INL)
2
No Missing Codes
2
24
Resolution, p-p
16.5
Resolution Effective
19
Output Noise, rms
2
Absolute Error
3
Offset Error
2, 4
Rev. 0| Page 3 of 28
Max
±0.01
±4
32
Unit
pF
1
% of FSR
Bit
Bit
Bit
aF/
Hz
fF
1
aF
1
Test Conditions/Comments
Factory calibrated
Conversion time ≥ 62 ms
Conversion time = 62 ms, see Table 5
Conversion time = 62 ms, see Table 5
See Table 5
25°C, V
DD
= 5 V, after offset calibration
After system offset calibration,
Excluding effect of noise
4
25°C, V
DD
= 5 V
See Figure 9 and Figure 10
50 Hz ± 1%, conversion time = 62 ms
60 Hz ± 1%, conversion time = 62 ms
AD7746 only
7-bit CAPDAC
Configurable via digital interface
System Offset Calibration Range
2
Offset Drift vs. Temperature
Gain Error
5
Gain Drift vs. Temperature
2
Allowed Capacitance to GND
2
Power Supply Rejection
Normal Mode Rejection
Channel-to-Channel Isolation
CAPDAC
Full Range
Resolution
6
Drift vs. Temperature
2
EXCITATION
Frequency
Voltage Across Capacitance
Average DC Voltage Across
Capacitance
Allowed Capacitance to GND
2
TEMPERATURE SENSOR
7
Resolution
Error
2
VOLTAGE INPUT
7
Differential VIN Voltage Range
Absolute VIN Voltage
2
Integral Nonlinearity (INL)
No Missing Codes
2
Resolution, p-p
–28
17
24
–1
0.02
–26
0.3
65
55
70
21
164
26
32
±V
DD
/8
±V
DD
/4
±V
DD
×
3/8
±V
DD
/2
±1
0.08
–24
60
1
28
<±40
pF
aF/°C
% of FS
ppm of FS/°C
pF
fF/V
dB
dB
dB
pF
fF
ppm of FS/°C
kHz
V
V
V
V
mV
GND 0.03
24
0.1
±0.5
±2
±V
REF
±3
16
100
±2
V
DD
+ 0.03
±15
pF
°C
°C
°C
V
V
ppm of FS
Bit
Bits
See Figure 11
V
REF
internal
Internal temperature sensor
External sensing diode
8
V
REF
internal or V
REF
= 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
Output Noise
3
μV rms
Offset Error
Offset Drift vs. Temperature
Full-Scale Error
2, 9
±3
15
0.025
0.1
μV
nV/°C
% of FS
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AD7747 制造商:AD 制造商全稱:Analog Devices 功能描述:24-Bit Capacitance-to-Digital Converter with Temperature Sensor