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AD7818:  Temperature Sensor (On-Chip) Single-Channel, 9 µs, 10-Bit ADC

Product Details


The AD7818 and AD7817 are 10-bit, single- and 4-channel A/D converters with 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 DAC, an on-chip temperature sensor with an accuracy of ±2°C, an on-chip clock oscillator, inherent track-andhold 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 package (TSSOP), while the AD7816/AD7818 come in an 8-lead small outline IC (SOIC) and an 8-lead microsmall outline IC (MSOP).

FEATURES and BENEFITS

  • 10-Bit ADC with 9 µs 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%)
  • Over-Temperature 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

Functional Block Diagram for AD7818

Documentation

Title Content Type File Type
AD7817/AD7818: Dual, Low Power CMOS, Analog Front End with DSP Microcomputer Data Sheet  (Rev D, 10/2012) (pdf, 1580 kB) Data Sheets PDF
MS-2210: Designing Power Supplies for High Speed ADC  (pdf, 327 kB) Technical Articles PDF
ADT7301: Accurate, SPI-Compatible Temperature Sensor in SOT Package  (htm)
(analogZone September 1, 2003)
Product Reviews HTM
Selection Guide: Temperature Sensors  (pdf, 807 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

AD7818 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD7818ARM Status: Production 8 ld MSOP 8 Ind Tube, 50 $3.40 $2.70 N  Material Info PCN Purchase
AD7818ARM-REEL Status: Last Time Buy 8 ld MSOP 8 Ind Reel, 3000 - $2.70 N  Material Info PCN/PDN Purchase
AD7818ARM-REEL7 Status: Contact ADI 8 ld MSOP 8 Ind Reel, 1000 - - N  Material Info PCN/PDN Contact ADI
AD7818ARMZ Status: Production 8 ld MSOP 8 Ind Tube, 50 $3.11 $2.46 Y  Material Info PCN Purchase Sample
AD7818ARMZ-REEL Status: Production 8 ld MSOP 8 Ind Reel, 3000 - $2.46 Y  Material Info PCN Purchase
AD7818ARMZ-REEL7 Status: Production 8 ld MSOP 8 Ind Reel, 1000 - $2.46 Y  Material Info PCN Purchase
AD7818ARZ-REEL7 Status: Production 8 ld SOIC 8 Comm. Reel, 1000 - $2.46 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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