Datasheet > AD7156

AD7156

更新时间： 2024-01-18 23:18:30

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
28页	388K
描述
Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel Capacitance Converter

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AD7156 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	HVSON, SOLCC10,.12,20	针数：	10
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.55
模拟集成电路 - 其他类型：	ANALOG CIRCUIT	JESD-30 代码：	S-PDSO-N10
JESD-609代码：	e3	长度：	3 mm
湿度敏感等级：	3	功能数量：	1
端子数量：	10	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	HVSON	封装等效代码：	SOLCC10,.12,20
封装形状：	SQUARE	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：	260	电源：	2/3.3 V
认证状态：	Not Qualified	座面最大高度：	0.85 mm
子类别：	Other Analog ICs	最大供电电流 (Isup)：	0.085 mA
最大供电电压 (Vsup)：	3.6 V	最小供电电压 (Vsup)：	1.8 V
表面贴装：	YES	温度等级：	INDUSTRIAL
端子面层：	Matte Tin (Sn)	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	40	宽度：	3 mm
Base Number Matches：	1

AD7156 数据手册

AD7156

HARDWARE DESIGN CONSIDERATIONS

OVERVIEW

PARASITIC RESISTANCE TO GROUND

The AD7156 is an interface to capacitive sensors.

On the input side, Sensor C_Xcan 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.

GND1

DATA

CIN

CDC

GND2

EXC

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.

Figure 43. Parasitic Resistance to Ground

The AD7156 CDC result is affected by a leakage current from

C_Xto ground; therefore, C_Xshould be isolated from the ground.

The equivalent resistance between C_Xand ground should be

maximized (see Figure 43). For more information, see Figure 10

to Figure 13.

PARASITIC CAPACITANCE TO GROUND

PARASITIC PARALLEL RESISTANCE

GND1

DATA

CIN

CDC

DATA

CIN

CDC

GND2

EXC

Figure 42. Parasitic Capacitance to Ground

Figure 44. Parasitic Parallel Resistance

The CDC architecture used in the AD7156 measures the

capacitance, C_X, connected between the EXC pins and the

CIN pins. In theory, any capacitance, C_GND, to ground should

not affect the CDC result (see Figure 42).

The AD7156 CDC measures the charge transfer between the

EXC and CIN pins. Any resistance connected in parallel to the

measured capacitance, C_X(see Figure 44), such as the parasitic

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

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).

C_P

R_P× f_EXC× 4

where:

R_Pis the parallel resistance.

_EXCis the excitation frequency.

For additional information, see Figure 15.

Rev. 0 | Page 24 of 28

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与AD7156相关器件

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AD7171BCPZ-500RL7	ADI	获取价格	16-Bit Low Power Sigma-Delta ADC
AD7171BCPZ-REEL7	ADI	获取价格	16-Bit Low Power Sigma-Delta ADC
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