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AD7816ARM-REEL7 Datasheet(PDF) 1 Page - Analog Devices |
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AD7816ARM-REEL7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page 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, nor for any infringements of patents or other rights of third parties that 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 www.analog.com Fax: 781/326-8703 © 2004 Analog Devices, Inc. All rights reserved. AD7816/AD7817/AD7818 Single- and 4-Channel, 9 s, 10-Bit ADCs with On-Chip Temperature Sensor 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 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 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 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 Automotive Battery Charging Applications 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/ MSOP package. 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 Temperature Measurement section of this data sheet. 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. 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). 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 (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. CHARGE REDISTRIBUTION DAC CLOCK DOUT SCLK RD/ WR CONVST AGND CONTROL REG A B OVERTEMP REG A > B OTI CONTROL LOGIC VBALANCE SAMPLING CAPACITOR MUX REF 2.5V TEMP SENSOR REFIN VDD DATA OUT DIN DGND BUSY CS VIN1 VIN2 VIN3 VIN4 AD7817 |
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