Datasheet > AD7156

AD7156

更新时间： 2024-01-12 07:08:11

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

PARASITIC SERIAL RESISTANCE

INPUT EMC PROTECTION

39kꢀ

82kꢀ

CIN

68pF

22pF

EXC

CDC

DATA

CIN

CDC

10kꢀ

47pF

GND

Figure 47. AD7156 CIN EMC Protection

EXC

Some applications may require an additional input filter for

improving EMC. Any input filter must be carefully designed,

considering the balance between the system capacitance

performance and system electromagnetic immunity.

Figure 45. Parasitic Serial Resistance

The AD7156 CDC result is affected by a resistance in series

with the measured capacitance.

Figure 47 shows one of the possible input circuit configurations

for significantly improving the system immunity against high

frequency noise while only slightly affecting the AD7156

performance in terms of additional gain and offset error.

The total serial resistance (R_S1+ R_S2in Figure 45) should be in

the order of hundreds of Ω (see Figure 14).

INPUT OVERVOLTAGE PROTECTION

POWER SUPPLY DECOUPLING AND FILTERING

CDC

1kꢀ

0.1µF

10µF

CIN

1kꢀ 1kꢀ

SDA

SCL

EXC

CDC

GND

Figure 48. AD7156 V_DDDecoupling and Filtering

Figure 46. AD7156 CIN Overvoltage Protection

The AD7156 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 48 shows a possible circuit configuration

for improving the system immunity against ripple and noise

coupled to the AD7156 via the power supply.

The AD7156 capacitive input has an internal ESD protection.

However, some applications may require an additional over-

voltage 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.

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 V_DDfilter than to connect to the AD7156. If the

AD7156 is used in standalone mode and the serial interface

is not used, it is better to connect the pull-up resistors directly

to the AD7156 V_DD.

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与AD7156相关器件

型号	品牌	获取价格	描述	数据表
AD7156BCPZ-REEL	ADI	获取价格	Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel
AD7156BCPZ-REEL	ROCHESTER	获取价格	SPECIALTY ANALOG CIRCUIT, PDSO10, 3 X 3 MM, ROHS COMPLIANT, LFCSP-10
AD7156BCPZ-REEL7	ADI	获取价格	Ultralow Power, 1.8 V, 3 mm × 3 mm, 2-Channel
AD7170	ADI	获取价格	12-Bit Low Power Sigma-Delta ADC
AD7170BCPZ-500RL7	ADI	获取价格	12-Bit Low Power Sigma-Delta ADC
AD7170BCPZ-REEL7	ADI	获取价格	12-Bit Low Power Sigma-Delta ADC
AD7171	ADI	获取价格	16-Bit Low Power Sigma-Delta ADC
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
AD7172-2	ADI	获取价格	True rail-to-rail analog and reference input buffers

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