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| 型号： | AD7156BCPZ-REEL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 17/28页 |
| 文件大小： | 0K |
| 描述： | IC CDC 2CH 12BIT 1.8V 10-LFCSP |
| 标准包装： | 5,000 |
| 类型： | 电容数字转换器 |
| 分辨率（位）： | 12 b |
| 采样率（每秒）： | 100k |
| 数据接口： | 串行 |
| 电压电源： | 单电源 |
| 电源电压： | 1.8 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘，CSP |
| 供应商设备封装： | 10-LFCSP-WD（3x3） |
| 包装： | 带卷 (TR) |
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AD7156
Rev. 0 | Page 24 of 28
HARDWARE DESIGN CONSIDERATIONS
OVERVIEW
The AD7156 is an interface to capacitive sensors.
On the input side, Sensor CX can be connected directly between
the AD7156 EXC and CIN pins. The way it is connected and the
electrical parameters of the sensor connection, such as parasitic
resistance or capacitance, can affect the system performance.
Therefore, any circuit with additional components in the capacitive
front end, such as overvoltage protection, has to be carefully
designed, considering the AD7156 specified limits and informa-
tion provided in this section.
On the output side, the AD7156 can work as a standalone device,
using the power-up default register settings and flagging the
result on the digital outputs. Alternatively, the AD7156 can be
interfaced to a microcontroller via the 2-wire serial interface,
offering flexibility by overwriting the AD7156 register values
from the host with a user-specific setup.
PARASITIC CAPACITANCE TO GROUND
DATA
CDC
EXC
CGND1
CIN
CGND2
CX
07
72
6-
0
52
Figure 42. Parasitic Capacitance to Ground
The CDC architecture used in the AD7156 measures the
capacitance, CX, connected between the EXC pins and the
CIN pins. In theory, any capacitance, CGND, to ground should
not affect the CDC result (see Figure 42).
The practical implementation of the circuitry in the chip implies
certain limits, and the result is gradually affected by capacitance
to ground (for information about the allowed capacitance to
GND for CIN and information about excitation see Table 1
and Figure 4 to Figure 9).
PARASITIC RESISTANCE TO GROUND
DATA
CDC
EXC
RGND1
CIN
RGND2
CX
07
72
6-
0
53
Figure 43. Parasitic Resistance to Ground
The AD7156 CDC result is affected by a leakage current from
CX to ground; therefore, CX should be isolated from the ground.
The equivalent resistance between CX and ground should be
to Figure 13.
PARASITIC PARALLEL RESISTANCE
DATA
CDC
EXC
CIN
RP
CX
07
72
6-
05
4
Figure 44. Parasitic Parallel Resistance
The AD7156 CDC measures the charge transfer between the
EXC and CIN pins. Any resistance connected in parallel to the
resistance of the sensor, also transfers charge. Therefore, the
parallel resistor is seen as an additional capacitance in the
output data. The equivalent parallel capacitance (or error
caused by the parallel resistance) can be approximately
calculated as
4
1
×
=
EXC
P
f
R
C
where:
RP is the parallel resistance.
fEXC is the excitation frequency.
For additional information, see Figure 15.
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相关代理商/技术参数 |
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| AD7156BCPZ-REEL7 | 功能描述:IC CDC 2CH 12BIT 1.8V 10LFCSP RoHS:是 类别:集成电路 (IC) >> 数据采集 - ADCs/DAC - 专用型 系列:- 产品培训模块:Data Converter Basics 标准包装:1 系列:- 类型:电机控制 分辨率（位）:12 b 采样率（每秒）:1M 数据接口:串行，并联 电压电源:单电源 电源电压:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:100-TQFP 供应商设备封装:100-TQFP（14x14） 包装:剪切带 (CT) 其它名称:296-18373-1 |
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| AD7161BCDZ-1WP | 制造商:Analog Devices 功能描述: |
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| AD-716J4310J-1 | 功能描述:Adapter Coaxial Connector 7/16 Jack, Female Socket To 4.3/10 Jack, Female Socket 50 Ohm 制造商:amphenol-rf division 系列:- 包装:散装 零件状态:有效 适配器类型:插孔至插孔 适配器系列:7/16 DIN 至 4.3/10 中性:母形至母形 转换自（适配器端）:7/16 插孔，母插口 转换至（适配器端）:4.3/10 插孔，母插口 转换类型:跨系列 阻抗:50 欧姆 样式:直形 安装类型:自由悬挂 频率 - 最大值:6GHz 侵入防护:- 特性:- 基体材料:黄铜 基体表面:白青铜 介电材料:聚四氟乙烯（PTFE） 中心触头材料:铜铍 中心触头镀层:银 配接次数:500 标准包装:25 |
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