AD7818

更新时间： 2024-11-22 22:53:31

品牌	Logo	应用领域
亚德诺 - ADI		传感器温度传感器
页数	文件大小	规格书
16页	189K
描述
Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor

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AD7818 数据手册

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

with On-Chip Temperature Sensor

AD7816/AD7817/AD7818

FUNCTIONAL BLOCK DIAGRAM

FEATURES

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

REF

AD7817

OVER-TEMP

REG

OTI

A > B

TEMP

SENSOR

CHARGE

REDISTRIBUTION

DAC

REF

2.5V

DATA

OUT

Resolution of 0.25؇C

IN1

IN2

IN3

؎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%)

Over-Temperature Indicator

MUX

CONTROL

LOGIC

CONTROL

REG

SAMPLING

CAPACITOR

SCLK

IN4

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 inter-

face 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

Temperature Measurement and Control

Data Acquisition Systems with Ambient Temperature

Monitoring (AD7817 and AD7818)

Industrial Process Control

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

Outline IC (SOIC), in a 16-lead, Thin Shrink Small Outline

Package (TSSOP), while the AD7816/AD7818 come in an

8-lead Small Outline IC (SOIC) and an 8-lead microsmall

Outline IC (µSOIC).

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 ±2°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/

µSOIC package.

2. An over-temperature indicator is implemented by carrying

out a digital comparison of the ADC code for Channel 0

(temperature sensor) with the contents of the on-chip over-

temperature register. The over-temperature indicator pin goes

logic low when 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 ±0.25°C. See Measuring Temperature section

of the data sheet.

SPI and QSPI are trademarks of Motorola, Inc.

MICROWIRE is a trademark of National Semiconductor Corporation.

REV. A

Information furnished by Analog Devices is believed to be accurate and

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

use, nor for any infringements of patents or other rights of third parties

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

otherwise under any patent or patent rights of Analog Devices.

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

Tel: 781/329-4700

Fax: 781/326-8703

World Wide Web Site: http://www.analog.com

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与AD7818相关器件

型号	品牌	获取价格	描述	数据表
AD7818_15	ADI	获取价格	Dual, Low Power CMOS, Analog Front End with DSP Microcomputer
AD7818AR	ADI	获取价格	Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
AD7818ARM	ADI	获取价格	Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
AD7818ARM-REEL	ADI	获取价格	Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
AD7818ARM-REEL7	ADI	获取价格	Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
AD7818ARMZ	ADI	获取价格	Dual, Low Power CMOS, Analog Front End with DSP Microcomputer
AD7818ARMZ-REEL	ADI	获取价格	Dual, Low Power CMOS, Analog Front End with DSP Microcomputer
AD7818ARMZ-REEL7	ADI	获取价格	Dual, Low Power CMOS, Analog Front End with DSP Microcomputer
AD7818AR-REEL	ADI	获取价格	Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor
AD7818AR-REEL7	ADI	获取价格	Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor

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