Datasheet > AD7746

AD7746

更新时间： 2024-02-10 11:29:26

品牌	Logo	应用领域
亚德诺 - ADI		转换器传感器温度传感器
页数	文件大小	规格书
28页	780K
描述
24-Bit Capacitance-to-Digital Converter with Temperature Sensor

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中文翻译

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技术参数
数据手册

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AD7746 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	针数：	16
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.31
最大精度（摄氏度）：	2 Cel	主体宽度：	4.4 mm
主体高度：	1.2 mm	主体长度或直径：	5 mm
JESD-609代码：	e3	安装特点：	SURFACE MOUNT
位数：	24	最大工作电流：	0.7 mA
最高工作温度：	125 °C	最低工作温度：	-40 °C
输出接口类型：	2-WIRE INTERFACE	封装形状/形式：	RECTANGULAR
传感器/换能器类型：	TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL	最大供电电压：	5.25 V
最小供电电压：	2.7 V	表面贴装：	YES
端子面层：	Matte Tin (Sn)	端接类型：	SOLDER

AD7746 数据手册

AD7745/AD7746

If the capacitive sensor can be considered to be at the same

temperature as the AD7745/AD7746 chip, the internal

temperature sensor can be used as a system temperature sensor.

That means the complete system temperature drift

compensation can be based on the AD7745/AD7746 internal

temperature sensor without need for any additional external

components. See the typical performance characteristics in

ꢀigure 18.

VOLTAGE INPUT

VDD

ANALOG TO DIGITAL CONVERTER

(ADC)

CLOCK

GENERATOR

VIN(+)

DATA

24-BIT Σ-∆

MODULATOR

DIGITAL

FILTER

RTD

EXTERNAL TEMPERATURE SENSOR

VIN(–)

EXTERNAL

TEMPERATURE

SENSOR

I ... N × I

REFIN(+)

REFIN(–)

VOLTAGE

REFERENCE

CLOCK

GENERATOR

REF

VIN (+)

VIN (–)

2N3906

∆V

DATA

DIGITAL

FILTER

AND

24-BIT Σ-∆

MODULATOR

GND

SCALING

Figure 42. Resistive Temperature Sensor Connected to the Voltage Input

The AD7745/AD7746 Σ-Δ core can work as a high resolution

(up to 21 ENOB) classic ADC with a fully differential voltage

input. The ADC can be used either with the on-chip high

precision, low drift, 1.17 V voltage reference, or an external

reference connected to the fully differential reference input pins.

VOLTAGE

REFERENCE

Figure 41. Transistor as an External Temperature Sensor

The AD7745/AD7746 provide the option of using an external

transistor as a temperature sensor in the system. The ∆V_BE

method, which is similar to the internal temperature sensor

method, is used. However, it is modified to compensate for the

serial resistance of connections to the sensor. Total serial

resistance (R_S1+ R_S2in ꢀigure 41) up to 1±± Ω is compensated.

The VIN(–) pin must be grounded for proper external

temperature sensor operation.

The voltage and reference inputs are continuously sampled by a

Σ-Δ modulator during the conversion. Therefore, the input

source impedance should be kept low. See the application

example in ꢀigure 42.

V_DDMONITOR

Along with converting external voltages, the AD7745/AD7746

Σ-Δ ADC can be used for monitoring the V_DDvoltage. The

voltage from the VDD pin is internally attenuated by 6.

The AD7745/AD7746 are factory calibrated for

Transistor 2N39±6 with the ideality factor n_f= 1.±±8.

See the typical performance characteristics shown

in ꢀigure 19.

TYPICAL APPLICATION DIAGRAM

3V/5V

POWER SUPPLY

0.1µF

10µF

10kΩ

VDD

TEMP

SENSOR

CLOCK

GENERATOR

HOST

SYSTEM

AD7745

VIN(+)

VIN(–)

SDA

I C

MUX

24-BIT Σ-∆

MODULATOR

DIGITAL

FILTER

SERIAL

INTERFACE

SCL

RDY

CIN1(+)

CIN1(–)

CONTROL LOGIC

CALIBRATION

CAP DAC

VOLTAGE

REFERENCE

EXCA

EXCB

EXCITATION

GND

REFIN(+) REFIN(–)

Figure 43. Basic Application Diagram for a Differential Capacitive Sensor

Rev. 0 | Page 2± of 28

1...21 22 232425 26 27 28

中文翻译

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与AD7746相关器件

型号	品牌	获取价格	描述	数据表
AD7746_15	ADI	获取价格	24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD7746ARUZ	ADI	获取价格	24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD7746ARUZ-REEL	ADI	获取价格	24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD7746ARUZ-REEL7	ADI	获取价格	24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD7747	ADI	获取价格	24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD7747_17	ADI	获取价格	24-Bit Capacitance-to-Digital Converter
AD7747ARUZ	ADI	获取价格	24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD7747ARUZ-REEL	ADI	获取价格	24-Bit Capacitance-to-Digital Converter
AD7747ARUZ-REEL7	ADI	获取价格	24-Bit Capacitance-to-Digital Converter with Temperature Sensor
AD774B	ADI	获取价格	Complete 12-Bit A/D Converters

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