RS1 CIN R
參數(shù)資料
型號(hào)： AD7150BRMZ-REEL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 17/28頁(yè)
文件大小： 0K
描述： IC CAP CONV 2CH ULT LP 10MSOP
設(shè)計(jì)資源： Using AD7150 for Proximity Sensing Appls (CN0095)
標(biāo)準(zhǔn)包裝： 3,000
類(lèi)型： 電容數(shù)字轉(zhuǎn)換器
輸入類(lèi)型： 電壓
輸出類(lèi)型： 數(shù)字
接口： 2 線串口
電流 - 電源： 120µA
安裝類(lèi)型： 表面貼裝
封裝/外殼： 10-TFSOP，10-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 10-MSOP
包裝： 帶卷 (TR)
配用： EVAL-AD7150EBZ-ND - BOARD EVAL FOR AD7150
AD7150
Rev. 0 | Page 24 of 28
PARASITIC SERIAL RESISTANCE
DATA
CDC
EXC
RS1
CIN
RS2
CX
06
51
7-
0
55
Figure 47. Parasitic Serial Resistance
The AD7150 CDC result is affected by a resistance in series
with the measured capacitance. The total serial resistance (RS1 +
RS2 in Figure 47) should be on the order of hundreds of Ω.
INPUT OVERVOLTAGE PROTECTION
EXC
GND
CDC
RS1
CIN
RS2
CX
06
51
7-
0
56
Figure 48. AD7150 CIN Overvoltage Protection
The AD7150 capacitive input has an internal ESD protection.
However, some applications may require an additional
overvoltage protection, depending on the application-specific
requirements. Any additional circuit in the capacitive front end
must be carefully designed, especially with respect to the limits
recommended for maximum capacitance to ground, maximum
serial resistance, maximum leakage, and so on.
INPUT EMC PROTECTION
EXC
CDC
CIN
CX
10k
82k
39k
47pF
22pF
68pF
GND
06
51
7-
05
7
Figure 49. AD7150 CIN EMC Protection
Some applications may require an additional input filter for
improving electromagnetic compatibility (EMC). Any input
filter must be carefully designed, considering the balance between
the system capacitance performance and system electromagnetic
immunity.
Figure 49 shows one of the possible input circuit configurations
significantly improving the system immunity against high
frequency noise and slightly affecting the AD7150 performance
in terms of additional gain and offset error.
POWER SUPPLY DECOUPLING AND FILTERING
CDC
GND
SDA
SCL
0.1F
10F
1k
VDD
1k
0
65
17
-0
58
Figure 50. AD7150 VDD Decoupling and Filtering
The AD7150 has good dc and low frequency power supply
rejection but may be sensitive to higher frequency ripple and
noise, specifically around the excitation frequency and its
harmonics. Figure 50 shows a possible circuit configuration for
improving the system immunity against ripple and noise
coupled to the AD7150 via the power supply.
If the serial interface is connected to the other circuits in the
system, it is better to connect the pull-up resistors on the other
side of the VDD filter than to connect to the AD7150. If the
AD7150 is used in standalone mode and the serial interface is
not used, it is better to connect the pull-up resistors directly to
the AD7150 VDD.
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