AD7150

更新时间： 2024-02-08 01:31:13

品牌	Logo	应用领域
亚德诺 - ADI		转换器
页数	文件大小	规格书
24页	258K
描述
Ultra Low Power, 2 Channel, Capacitance Converter for Proximity Sensing

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技术参数
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AD7150 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：	TSSOP
包装说明：	TSSOP,	针数：	10
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	0.77
Is Samacsys：	N	商用集成电路类型：	CONSUMER CIRCUIT
JESD-30 代码：	S-PDSO-G10	JESD-609代码：	e3
长度：	3 mm	湿度敏感等级：	1
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：	TSSOP
封装形状：	SQUARE	封装形式：	SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度（摄氏度）：	260	认证状态：	Not Qualified
座面最大高度：	1.1 mm	最大供电电压 (Vsup)：	3.6 V
最小供电电压 (Vsup)：	2.7 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	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：	30
宽度：	3 mm	Base Number Matches：	1

AD7150 数据手册

AD7150

Preliminary Technical Data

ARCHITECTURE AND MAIN FEATURES

+3.3V

CLOCK

GENERATOR

PWR DOWN

TIMER

AD7150

IN1

SENS1

SCL

DIGITAL

FILTER

SERIAL

INTERFACE

PROGRAMMING

INTERFACE

Σ−∆ CDC

SDA

EXC1

MUX

OUT1

IN2

THRESHOLD

CAP DAC

SENS2

DIGITAL

OUTPUTS

OUT2

EXCITATION

THRESHOLD

GND

EXC2

Figure 10. AD7150 Block Diagram

OVERVIEW

The AD7150 core is a high performance capacitance to digital

converter (CDC), which allows the part to be interfaced directly

to a capacitive sensor.

CAPACITANCE TO DIGITAL CONVERTER

(CDC)

The comparators compare the CDC result with thresholds,

either fixed or dynamically adjusted by the on-chip adaptive

threshold algorithm engine. Thus, the outputs indicate a

defined change in the input sensor capacitance.

CLOCK

GENERATOR

0x000 .. 0xFFF

DATA

CIN

Σ-∆

MODULATOR

DIGITAL

FILTER

SENS

0..4pF

The AD7150 also integrates an excitation source and CAPDAC

for the capacitive inputs, an input multiplexer, a complete clock

generator, a power down timer, control logic, and an I2C-

compatible serial interface for configuring the part and

accessing the internal CDC data, status, etc., if required in the

system. See Figure 10.

EXC

EXCITATION

Figure 11. CDC Simplified Block Diagram

CAPDAC

CAPACITANCE TO DIGITAL CONVERTER

The AD7150 CDC core maximum full-scale input range is 4 pF.

However, the part can accept a higher capacitance on the input

and the offset (not-changing component) capacitance up to 10

pF can be balanced by a programmable on-chip CAPDAC.

Figure 11 shows the CDC simplified functional diagram. The

converter consists of a second order Σ-Δ (or charge balancing)

modulator and a third order digital filter. The measured

capacitance C_Xis connected between an excitation source and

the Σ-Δ modulator input. The excitation signal is applied on the

C_Xduring the conversion and the modulator continuously

samples the charge going through the C_X. The digital filter

processes the modulator output, which is a stream of 0s and 1s

containing the information in 0 and 1 density. The data are

processed by the adaptive threshold engine and output

comparators; the data can be also read through the serial

interface.

CAPDAC

10pF

0x000 .. 0xFFF

CIN(+)

EXC

0..4pF

CDC

DATA

SENS

10..14pF

Figure 12. Using CAPDAC

The AD7150 is designed for floating capacitive sensors.

Therefore, both C_Xplates have to be isolated from ground or

any other fixed potential node in the system.

The CAPDAC can be understood as a negative capacitance

connected internally to the CIN pin. The CAPDAC has a 6-bit

resolution and a monotonic transfer function. The example in

Figure 12 shows how to use the CAPDAC to shift the CDC 4 pF

input range to measure capacitance between 10 pF to 14 pF.

The AD7150 features slew rate limiting on the excitation voltage

output, which decrease the energy of higher harmonics on the

excitation signal and dramatically improves the system EMC

radiation performance.

Rev. PrD | Page 8 of 24

1...5 6 789 10 11...24

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与AD7150相关器件

型号	品牌	描述	获取价格	数据表
AD7150BRMZ	ADI	Ultra-Low Power, 2-Channel, Capacitance Converter for Proximity Sensing	获取价格
AD7150BRMZ-REEL	ADI	Ultra-Low Power, 2-Channel, Capacitance Converter for Proximity Sensing	获取价格
AD7151	ADI	Ultra-Low Power, 1-Channel, Capacitance Converter for Proximity Sensing	获取价格
AD7151BRMZ	ADI	Ultra-Low Power, 1-Channel, Capacitance Converter for Proximity Sensing	获取价格
AD7151BRMZ-REEL	ADI	Ultra-Low Power, 1-Channel, Capacitance Converter for Proximity Sensing	获取价格
AD7152	ADI	12-Bit Capacitance-to-Digital Converter	获取价格

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