AD7817 Temperature Sensor (On Chip) 4-Channel, 9 µs, 10-Bit ADC

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).

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
Analog to Digital Converters
Data Sheets
Documentnote
AD7817/AD7818: Dual, Low Power CMOS, Analog Front End with DSP Microcomputer Data Sheet (Rev. E)PDF 1580 kB
Application Notes
Documentnote
AN-101: Cross Plot Generator Allows Quick A/D Converter EvaluationPDF 280 kB
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD7817ARU Production16 ld TSSOPOTH 96-40 to 85C00N
AD7817ARU-REEL7 Production16 ld TSSOPREEL 1000-40 to 85C00N
AD7817ARUZ Production16 ld TSSOPOTH 96-40 to 85C5.454.21Y
AD7817ARUZ-REEL7 Production16 ld TSSOPREEL 1000-40 to 85C04.21Y
AD7817ARZ Production16 ld SOICOTH 48-40 to 85C5.454.21Y
AD7817ARZ-REEL7 Production16 ld SOICREEL 1000-40 to 85C04.26Y
AD7817BRU Production16 ld TSSOPOTH 96-40 to 85C8.036.2N
AD7817BRU-REEL7 Last Time Buy16 ld TSSOPREEL 1000-40 to 85C00N
AD7817BRUZ Production16 ld TSSOPOTH 96-40 to 85C7.35.64Y
AD7817BRUZ-REEL Production16 ld TSSOPREEL 2500-40 to 85C05.64Y
AD7817BRUZ-REEL7 Production16 ld TSSOPREEL 1000-40 to 85C05.64Y
AD7817BRZ Production16 ld SOICOTH 48-40 to 85C7.35.64Y
AD7817BRZ-REEL Production16 ld SOICREEL 2500-40 to 85C05.64Y
AD7817BRZ-REEL7 Production16 ld SOICREEL 1000-40 to 85C05.64Y
AD7817SR Production16 ld SOICOTH 48-40 to 85C00N
Reference Materials
AD7817/AD7818: Dual, Low Power CMOS, Analog Front End with DSP Microcomputer Data Sheet (Rev. E) ad7818
AN-101: 交会图发生器加快模数转换器评估 (Rev. 0) ad677
AN-101: Cross Plot Generator Allows Quick A/D Converter Evaluation ad677
MS-2210:高速ADC的电源设计 ad9861