ACSHIELD OUTPUT The AD7148 measures capacitance be" />
參數(shù)資料
型號(hào): AD7148ACPZ-1500RL7
廠商: Analog Devices Inc
文件頁(yè)數(shù): 21/57頁(yè)
文件大?。?/td> 0K
描述: IC CAP-TO-DGTL CONV PROG 16LFCSP
標(biāo)準(zhǔn)包裝: 1
類型: 電容性
觸摸面板接口: 2 線
輸入數(shù)/鍵: 8
分辨率(位): 16 b
數(shù)據(jù)接口: I²C,串行
數(shù)據(jù)速率/采樣率 (SPS,BPS): 250k
電壓基準(zhǔn): 內(nèi)部
電源電壓: 2.6 V ~ 3.3 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-VQFN 裸露焊盤,CSP
供應(yīng)商設(shè)備封裝: 16-LFCSP
包裝: 標(biāo)準(zhǔn)包裝
產(chǎn)品目錄頁(yè)面: 781 (CN2011-ZH PDF)
其它名稱: AD7148ACPZ-1500RL7DKR
AD7148
Rev. A | Page 27 of 56
ACSHIELD OUTPUT
The AD7148 measures capacitance between CINx and ground.
Any capacitance to ground on the signal path between the CINx
pins and the sensor is included in the conversion result.
To eliminate the stray capacitance to ground, the ACSHIELD signal
should be used to shield the connection between the sensor and
CINx, as shown in Figure 37. The plane around the sensors
should also be connected to ACSHIELD.
The ACSHIELD output is the same signal waveform as the excita-
tion signal on CINx. Therefore, there is no ac current between
CINx and ACSHIELD, and any capacitance between these pins
does not affect the CINx charge transfer.
Using ACSHIELD eliminates capacitance-to-ground pick-up, which
means that the AD7148 can be placed up to 60 cm away from
the sensors. This allows the AD7148 to be placed on a separate
PCB from the sensors, provided that the connections between
the sensors and the CINx inputs are correctly shielded, using
ACSHIELD.
CIN0
CIN1
CIN2
CIN3
AD7148
ACSHIELD
SEN
S
O
R
PCB
071
55-
036
Figure 37. ACSHIELD
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