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AD7817AR-REEL7 PDF预览

AD7817AR-REEL7

更新时间: 2024-02-26 17:47:46
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

AD7817AR-REEL7 技术参数

是否Rohs认证:不符合生命周期:Obsolete
包装说明:0.150 INCH, LEAD FREE, MS-012AC, SOIC-16Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.74Is Samacsys:N
最大精度(摄氏度):2 Cel主体宽度:3.9 mm
主体高度:1.55 mm主体长度或直径:9.9 mm
JESD-609代码:e0安装特点:SURFACE MOUNT
位数:10端子数量:16
最大工作电流:2 mA最高工作温度:85 °C
最低工作温度:-40 °C输出接口类型:3-WIRE INTERFACE
封装主体材料:PLASTIC/EPOXY封装等效代码:SOP16,.25
封装形状/形式:RECTANGULAR电源:3/5 V
传感器/换能器类型:TEMPERATURE SENSOR,SWITCH/DIGITAL OUTPUT,SERIAL子类别:Other Sensors
最大供电电压:5.5 V最小供电电压:2.7 V
表面贴装:YES端子面层:Tin/Lead (Sn85Pb15)
端接类型:SOLDERBase Number Matches:1

AD7817AR-REEL7 数据手册

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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  
V
REF  
IN  
DD  
AD7817  
OVERTEMP  
REG  
A > B  
A
OTI  
B
TEMP  
SENSOR  
CHARGE  
REDISTRIBUTION  
DAC  
REF  
2.5V  
DATA  
OUT  
D
OUT  
V
IN1  
V
IN2  
MUX  
CONTROL  
LOGIC  
CONTROL  
REG  
V
SAMPLING  
CAPACITOR  
D
IN3  
IN  
V
IN4  
SCLK  
RD/WR  
CLOCK  
V
BALANCE  
CS  
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  
register. The overtemperature 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 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  
© 2004 Analog Devices, Inc. All rights reserved.  

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