Datasheet > AD7818_15

AD7818_15

更新时间： 2024-11-20 01:22:35

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
20页	1587K
描述
Dual, Low Power CMOS, Analog Front End with DSP Microcomputer

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AD7818_15 数据手册

Dual, Low Power CMOS, Analog Front End

with DSP Microcomputer

Data Sheet

AD7817/AD7818

FEATURES

FUNCTIONAL BLOCK DIAGRAMS

REF

10-bit ADC with 9 µs conversion time

1 AD7818 and 4 AD7817 single-ended analog input channels

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%)

AD7817

OVERTEMP

REG

A > B

OTI

TEMP

SENSOR

CHARGE

REDISTRIBUTION

DAC

REF

2.5V

DATA

OUT

IN1

IN2

IN3

IN4

MUX

CONTROL

LOGIC

REG

CONTROL

SAMPLING

CAPACITOR

SCLK

RD/WR

CLOCK

BALANCE

Overtemperature indicator

AGND

DGND

BUSY

CONVST

Automatic power-down at the end of a conversion

Low power operation

Figure 1. AD7817 Functional Block Diagram

4 µW at a throughput rate of 10 SPS

40 µW at a throughput rate of 1 kSPS

400 µW at a throughput rate of 10 kSPS

Flexible serial interface

AD7818

OVERTEMP

REG

A > B

OTI

TEMP

SENSOR

REF

2.5V

CHARGE

REDISTRIBUTION

DAC

DATA

OUT

APPLICATIONS

IN/OUT

Data acquisition systems with ambient temperature

monitoring

IN1

MUX

CONTROL

LOGIC

SAMPLING

CAPACITOR

CONTROL

REG

SCLK

Industrial process control

Automotive

RD/WR

CLOCK

GENERATOR

BALANCE

Battery charging applications

AGND

CONVST

Figure 2. AD7818 Functional Block Diagram

GENERAL DESCRIPTION

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

digital converters (ADCs) with an on-chip temperature sensor that

can operate from a single 2.7 V to 5.5 V power supply. Each part

contains a 9 µs successive approximation converter based around

a capacitor digital-to-analog converter (DAC), an on-chip

temperature sensor with an accuracy of 2°C, an on-chip clock

oscillator, inherent track-and-hold functionality, and an on-chip

reference (2.5 V).

information, refer to the AD7817 Serial Interface section and

the AD7818 Serial Interface Mode section.

The AD7817 is available in a narrow body, 0.15 inch, 16-lead

SOIC and a 16-lead TSSOP, and the AD7818 comes in an 8-lead

SOIC and an 8-lead MSOP.

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.

2. An overtemperature 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 overtemperature

when a predetermined temperature is exceeded.

The on-chip temperature sensor of the AD7817/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 the Temperature Measurement section.

The AD7817/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, and

National Semiconductors MICROWIRE protocols. For more

3. The automatic power-down feature enables the AD7817 and

AD7818 to achieve superior power performance at slower

throughput rates, that is, 40 µW at 1 kSPS throughput rate.

Rev. D

Document Feedback

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 that may result fromits use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks andregisteredtrademarks 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

Technical Support

www.analog.com

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与AD7818_15相关器件

型号	品牌	获取价格	描述	数据表
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
AD7818ARZ	ADI	获取价格	Dual, Low Power CMOS, Analog Front End with DSP Microcomputer

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