10-Bit Digital Temperature Sensor (AD7416) and Four Single-Channel ADCs

The AD7417 and AD7418 are 10-bit, 4-channel and single-channel ADCs with an on-chip temperature sensor that can operate from a single 2.7 V to 5.5 V power supply. The devices contain a 15 μs successive approximation converter, a 5-channel multiplexer, a temperature sensor, a clock oscillator, a track-and-hold, and a reference (2.5 V). The AD7416 is a temperature-monitoring only device in an 8-lead package. The AD7416/AD7417/AD7418 have an on-chip temperature sensor that allows an accurate measurement of the ambient temperature (±1°C @ 25°C, ±2°C overtemperature) to be made. The measurable temperature range is −40°C to +125°C. 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 TOTI setpoint register. The AD7417 offers a space-saving, 10-bit analog-to-digital solution with four external voltage input channels, an on-chip temperature sensor, an on-chip reference, and a clock oscillator. The automatic power-down feature enables the AD7416/ AD7417/AD7418 to achieve superior power performance. At slower throughput rates, the part can be programmed to operate in a low power shutdown mode, allowing further savings in power consumption.

The temperature sensor on the parts can be accessed via multip-lexer 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 (±1°C @ 25°C). On-chip registers can be programmed with high and low tempera-ture limits, and an open-drain overtemperature indicator (OTI) output is provided, which becomes active when a programmed limit is exceeded.

A configuration register allows programming of the sense of the OTI output (active high or active low) and its operating mode (comparator or interrupt). A programmable fault queue counter allows the number of out-of-limit measurements that must occur before triggering the OTI output to be set to prevent spurious triggering of the OTI output in noisy environments.

An I2C® compatible serial interface allows the AD7416/AD7417/ AD7418 registers to be written to and read back. The three LSBs of the AD7416/AD7417 serial bus address can be selected, which allows up to eight AD7416/AD7417 devices to be connected to a single bus.

The AD7417 is available in a narrow body, 0.15 inch, 16-lead, small outline package (SOIC) and in a 16-lead, thin shrink, small outline package (TSSOP). The AD7416 and AD7418 are available in 8-lead SOIC and MSOP packages.

Product Highlights
  • The AD7416/AD7417/AD7418 have an on-chip temperature sensor that allows an accurate measurement of the ambient temperature (±1°C @ 25°C, ±2°C overtemperature) to be made. The measurable temperature range is −40°C to +125°C. 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 TOTI setpoint register.
  • The AD7417 offers a space-saving, 10-bit analog-to-digital solution with four external voltage input channels, an on-chip temperature sensor, an on-chip reference, and a clock oscillator.
  • The automatic power-down feature enables the AD7416/ AD7417/AD7418 to achieve superior power performance. At slower throughput rates, the part can be programmed to operate in a low power shutdown mode, allowing further savings in power consumption.
Applications
  • Data acquisition with ambient temperature monitoring
  • Industrial process control
  • Automotive
  • Battery-charging applications
  • Personal computers
Features and Benefits
  • 10-bit ADC with 15 μs and 30 μs conversion times
  • Single and 4 single-ended analog input channels
  • On-chip temperature sensor:
    −40°C to +125°C
  • On-chip track-and-hold
  • Overtemperature indicator
  • Automatic power-down at the end of a conversion
  • Wide operating supply range: 2.7 V to 5.5 V
  • I2C-compatible serial interface
  • Selectable serial bus address allows connection of up to 8 AD7416/AD7417 devices to a single bus
  • AD7416 is a superior replacement for LM75
  • Analog to Digital Converters
    Sensors
    Data Sheets
    Documentnote
    AD7416/AD7417/AD7418: 10-Bit Digital Temp Sensor (AD7416) and Four/Single-Channel ADCs Data Sheet (Rev. I)PDF 325 kB
    Application Notes
    Documentnote
    AN-588: AD7416/AD7417/AD7418 Power-On Reset Circuit (Rev. 0)PDF 29 kB
    AN-561: AD7416 Connects to the PIC16F84 via Emulated I²C™ Interface (Rev. 0)PDF 74 kB
    User Guides
    Documentnote
    UG-622: Evaluating the AD7416/AD7417/AD7418 10-Bit ADCs with On-Chip Temperature SensorPDF 1.45 M
    Order Information
    Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
    AD7416AR-REEL Last Time Buy8 ld SOICREEL 2500-40 to 125C01.16N
    AD7416ARM Production8 ld MSOPOTH 50-40 to 125C1.321.16N
    AD7416ARM-REEL7 Production8 ld MSOPREEL 1000-40 to 125C01.16N
    AD7416ARMZ Production8 ld MSOPOTH 50-40 to 125C1.151Y
    AD7416ARMZ-REEL Production8 ld MSOPREEL 3000-40 to 125C01Y
    AD7416ARMZ-REEL7 Production8 ld MSOPREEL 1000-40 to 125C01Y
    AD7416ARZ Production8 ld SOICOTH 98-40 to 125C1.151Y
    AD7416ARZ-REEL Production8 ld SOICREEL 2500-40 to 125C01Y
    AD7416ARZ-REEL7 Production8 ld SOICREEL 1000-40 to 125C01Y
    Evaluation Boards
    Part NumberDescriptionPriceRoHS
    EVAL-AD7416/7/8EBZEvaluation Board151.8Y
    AD7416/AD7417/AD7418: 10-Bit Digital Temp Sensor (AD7416) and Four/Single-Channel ADCs Data Sheet (Rev. I) ad7416
    AN-588: AD7416/AD7417/AD7418 Power-On Reset Circuit (Rev. 0) ad7416
    AN-561: AD7416 Connects to the PIC16F84 via Emulated I²C™ Interface (Rev. 0) ad7416
    UG-622: Evaluating the AD7416/AD7417/AD7418 10-Bit ADCs with On-Chip Temperature Sensor ad7416