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| 型號： | EVAL-AD7746EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 22/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7746 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 傳感器類型： | 觸摸，電容式 |
| 接口： | I²C |
| 電源電壓： | 2.7 V ~ 5.25 V |
| 嵌入式： | 否 |
| 已供物品： | 板，纜線，CD |
| 已用 IC / 零件： | AD7746 |
| 產(chǎn)品目錄頁面： | 781 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | AD7746ARUZ-ND - IC CONV 2CH CAP TO DGTL 16-TSSOP AD7746ARUZ-REEL7-ND - IC CONV 2CH CAP TO DGTL 16-TSSOP AD7746ARUZ-REEL-ND - IC CONV 2CH CAP TO DGTL 16-TSSOP |
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AD7745/AD7746
Rev. 0| Page 3 of 28
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
Min
Typ
Max
Unit
Test Conditions/Comments
CAPACITIVE INPUT
Conversion Input Range
±4.096
pF1
Factory calibrated
Integral Nonlinearity (INL)2
±0.01
% of FSR
No Missing Codes2
24
Bit
Conversion time ≥ 62 ms
Resolution, p-p
16.5
Bit
Conversion time = 62 ms, see Table 5
Resolution Effective
19
Bit
Conversion time = 62 ms, see Table 5
Output Noise, rms
2
aF/
√Hz
See Table 5
Absolute Error3
±4
fF1
25°C, VDD = 5 V, after offset calibration
Offset Error2, 4
32
aF1
After system offset calibration,
Excluding effect of noise4
System Offset Calibration Range2
±1
pF
Offset Drift vs. Temperature
–1
aF/°C
Gain Error5
0.02
0.08
% of FS
25°C, VDD = 5 V
Gain Drift vs. Temperature2
–28
–26
–24
ppm of FS/°C
Allowed Capacitance to GND2
60
pF
Power Supply Rejection
0.3
1
fF/V
Normal Mode Rejection
65
dB
50 Hz ± 1%, conversion time = 62 ms
55
dB
60 Hz ± 1%, conversion time = 62 ms
Channel-to-Channel Isolation
70
dB
AD7746 only
CAPDAC
Full Range
17
21
pF
Resolution6
164
fF
7-bit CAPDAC
Drift vs. Temperature2
24
26
28
ppm of FS/°C
EXCITATION
Frequency
32
kHz
Voltage Across Capacitance
±VDD/8
V
Configurable via digital interface
±VDD/4
V
±VDD
× 3/8
V
±VDD/2
V
Average DC Voltage Across
Capacitance
<±40
mV
Allowed Capacitance to GND2
100
pF
See Figure 11
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
Output Noise
3
V rms
Conversion time = 62 ms
Offset Error
±3
V
Offset Drift vs. Temperature
15
nV/°C
Full-Scale Error2, 9
0.025
0.1
% of FS
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