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AD7818ARMZ-REEL Datasheet(PDF) 1 Page - Analog Devices |
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AD7818ARMZ-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page Dual, Low Power CMOS, Analog Front End with DSP Microcomputer Data Sheet AD7817/AD7818 Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2012 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES 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%) Overtemperature indicator Automatic power-down at the end of a conversion Low power operation 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 APPLICATIONS Data acquisition systems with ambient temperature monitoring Industrial process control Automotive Battery charging applications FUNCTIONAL BLOCK DIAGRAMS AD7817 TEMP SENSOR VIN1 VIN2 VIN3 VIN4 MUX AGND DGND VBALANCE SAMPLING CAPACITOR REF 2.5V REFIN OTI DOUT DIN SCLK RD/WR CS VDD BUSY CONVST CLOCK REG CONTROL CONTROL LOGIC DATA OUT A B OVERTEMP REG CHARGE REDISTRIBUTION DAC A > B Figure 1. AD7817 Functional Block Diagram AD7818 TEMP SENSOR VIN1 MUX AGND VBALANCE SAMPLING CAPACITOR REF 2.5V OTI DIN/OUT SCLK RD/WR VDD CONVST CLOCK GENERATOR CONTROL REG CONTROL LOGIC DATA OUT A B OVERTEMP REG CHARGE REDISTRIBUTION DAC A > B 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). 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 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 register. The overtemperature indicator pin goes logic low when a predetermined temperature is exceeded. 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. |
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