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AD7818ARM PDF预览

AD7818ARM

更新时间: 2024-02-19 04:47:43
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
16页 189K
描述
Single- and 4-Channel, 9 us, 10-Bit ADCs with On-Chip Temperature Sensor

AD7818ARM 技术参数

是否无铅: 不含铅是否Rohs认证: 符合
生命周期:Obsolete包装说明:SOP8,.25
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.51
JESD-609代码:e3安装特点:SURFACE MOUNT
端子数量:8最大工作电流:2 mA
最高工作温度:85 °C最低工作温度:-40 °C
封装主体材料:PLASTIC/EPOXY封装等效代码:SOP8,.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/Transducers
表面贴装:YES端子面层:Matte Tin (Sn)
Base Number Matches:1

AD7818ARM 数据手册

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Single- and 4-Channel, 9 s, 10-Bit ADCs  
a
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  
V
REF  
DD  
IN  
AD7817  
OVER-TEMP  
REG  
OTI  
A > B  
A
B
TEMP  
SENSOR  
CHARGE  
REDISTRIBUTION  
DAC  
REF  
2.5V  
DATA  
OUT  
D
OUT  
Resolution of 0.25؇C  
V
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  
V
V
MUX  
CONTROL  
LOGIC  
CONTROL  
REG  
SAMPLING  
CAPACITOR  
D
IN  
V
SCLK  
IN4  
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 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  
© Analog Devices, Inc., 2000  

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