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AD7817AR-REEL7

更新时间： 2024-11-19 12:41:39

品牌	Logo	应用领域
亚德诺 - ADI		传感器换能器温度传感器输出元件
页数	文件大小	规格书
20页	269K
描述
Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor

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AD7817AR-REEL7 数据手册

Single- and 4-Channel, 9 ␮s, 10-Bit ADCs

with On-Chip Temperature Sensor

AD7816/AD7817/AD7818

FEATURES

FUNCTIONAL BLOCK DIAGRAM

10-Bit ADC with 9 ␮s Conversion Time

One (AD7818) and Four (AD7817) Single-Ended Analog

Input Channels

The AD7816 Is a Temperature Measurement Only Device

On-Chip Temperature Sensor

Resolution of 0.25؇C

؎2؇C Error from –40؇C to +85؇C

–55؇C to +125؇C Operating Range

Wide Operating Supply Range

2.7 V to 5.5 V

Inherent Track-and-Hold Functionality

On-Chip Reference (2.5 V ؎ 1%)

Overtemperature Indicator

REF

AD7817

OVERTEMP

REG

A > B

OTI

TEMP

SENSOR

CHARGE

REDISTRIBUTION

DAC

REF

2.5V

DATA

OUT

IN1

IN2

MUX

CONTROL

LOGIC

CONTROL

REG

SAMPLING

CAPACITOR

IN3

IN4

SCLK

RD/WR

CLOCK

BALANCE

BUSY

AGND

DGND

CONVST

Automatic Power-Down at the End of a Conversion

Low Power Operation

4 ␮W at a Throughput Rate of 10 SPS

40 ␮W at a Throughput Rate of 1 kSPS

400 ␮W at a Throughput Rate of 10 kSPS

Flexible Serial Interface

The AD7816, AD7817, and AD7818 have a flexible serial

interface that allows easy interfacing to most microcontrollers.

The interface is compatible with the Intel 8051, Motorola

SPI^®and QSPI™ protocols and National Semiconductors

MICROWIRE™ protocol. For more information refer to the

Serial Interface section of this data sheet.

APPLICATIONS

Ambient Temperature Monitoring (AD7816)

Thermostat and Fan Control

High Speed Microprocessor

The AD7817 is available in a narrow body 0.15" 16-lead small

outline IC (SOIC), in a 16-lead, thin shrink small outline pack-

age (TSSOP), while the AD7816/AD7818 come in an 8-lead

small outline IC (SOIC) and an 8-lead microsmall outline IC

(MSOP).

Temperature Measurement and Control

Data Acquisition Systems with Ambient Temperature

Monitoring (AD7817 and AD7818)

Industrial Process Control

Automotive

Battery Charging Applications

PRODUCT HIGHLIGHTS

1. The devices have an on-chip temperature sensor that allows an

accurate measurement of the ambient temperature to be

made. The measurable temperature range is –55°C to +125°C.

GENERAL DESCRIPTION

The AD7818 and AD7817 are 10-bit, single- and 4-channel

A/D converters with on-chip temperature sensor that can oper-

ate from a single 2.7 V to 5.5 V power supply. Each part con-

tains a 9 µs successive-approximation converter based around

a capacitor DAC, an on-chip temperature sensor with an accu-

racy of Ϯ2°C, an on-chip clock oscillator, inherent track-and-

hold functionality and an on-chip reference (2.5 V). The

AD7816 is a temperature monitoring only device in a SOIC/

MSOP package.

2. An overtemperature indicator is implemented by carrying out a

digital comparison of the ADC code for Channel 0 (tempera-

ture sensor) with the contents of the on-chip overtemperature

a predetermined temperature is exceeded.

3. The automatic power-down feature enables the AD7816,

AD7817, and AD7818 to achieve superior power perfor-

mance at slower throughput rates, e.g., 40 µW at 1 kSPS

throughput rate.

The on-chip temperature sensor of the AD7817 and AD7818

can be accessed via Channel 0. When Channel 0 is selected and

a conversion is initiated, the resulting ADC code at the end of

the conversion gives a measurement of the ambient temperature

with a resolution of Ϯ0.25°C. See Temperature Measurement

section of this data sheet.

REV. C

Information furnished by Analog Devices is believed to be accurate and

reliable. However, no responsibility is assumed by Analog Devices for its

use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat

may result from its use. No license is granted by implication or otherwise

under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

Fax: 781/326-8703

www.analog.com

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与AD7817AR-REEL7相关器件

型号	品牌	获取价格	描述	数据表
AD7817ARU	ADI	获取价格	Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
AD7817ARU-REEL	ADI	获取价格	Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
AD7817ARU-REEL7	ADI	获取价格	Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
AD7817ARUZ	ROCHESTER	获取价格	4-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16, MO-153-AB, TSSOP-16
AD7817ARUZ	ADI	获取价格	Dual, Low Power CMOS, Analog Front End with DSP Microcomputer
AD7817ARUZ-REEL	ADI	获取价格	Dual, Low Power CMOS, Analog Front End with DSP Microcomputer
AD7817ARUZ-REEL7	ADI	获取价格	Dual, Low Power CMOS, Analog Front End with DSP Microcomputer
AD7817ARZ	ADI	获取价格	Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
AD7817ARZ	ROCHESTER	获取价格	4-CH 10-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, PDSO16, LEAD FREE, MS-012-AC, SOI
AD7817ARZ-REEL	ADI	获取价格	Dual, Low Power CMOS, Analog Front End with DSP Microcomputer

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