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AD7818:  TEMPERATURE SENSOR (ON-CHIP) SINGLE-CHANNEL, 9 µS, 10-BIT ADC

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 ...More

AD7818:  TEMPERATURE SENSOR (ON-CHIP) SINGLE-CHANNEL, 9 µS, 10-BIT ADC

Product Description

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).

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  • 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
  • Output Type: Digital
  • Sensor Output: MICROWIRE (TM),QSPI (TM),SPI (TM)
  • Temp Res(°C/LSB): 0.25°C/LSB
  • Supply Voltage Range: +2.7V to +5.5V
  • Temp Range(s): -40 to +85

Functional Block Diagram for AD7818

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This is the acceptable operating range of the device. The various ranges specified are as follows:
  • Commercial: 0 to +70 degrees Celsius
  • Military : -55 to +125 degrees Celsius
  • Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
  • Automotive: -40 to +125 degrees Celsius
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*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.
**Sample availability may be better than production availability. Please enter samples into your cart to check sample availability.