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AD849x breakout board

I wanted to try OSH Park, so I designed a simple breakout board for the AD849x thermocouple amplifier ICs.

christophChristoph
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Thermocouples are good for measuring high temperatures, but require cold junction-compensation and a high-resolution ADC or amplification. The AD849x ICs do both and generate a 5mV/K output that is much easier to handle.

My design is very similar to that sold by adafruit, but allows you to pick your own filter components, and it supports dual supplies and a reference input for offsetting the signal.
  • 1 × PCB Electronic Components / Misc. Electronic Components
  • 1 × AD849x (AD8494, AD8495, AD8496, or AD8497)
  • 1 × Resistor, 1M Ohm, 0805 package
  • 2 × Resistor, 10k Ohm, 0805 package
  • 3 × Capacitor, 100 nF, 0805 package

View all 9 components

  • Small teensyduino example added

    Christoph • 08/23/2014 at 17:36 • 0 comments

    I've added a small example to the github files. While it's written for teensyduino running on a Teensy 3.0 or 3.1, it shows how easy to use the amplifier is. It should be no problem to port it to other architectures for anyone who has used a microcontroller's ADC before.

    I used it to measure the temperature of my laptop's outlet air (57 °C):

    A close-up of the connections:

    -, Ref, and Gnd are tied together for single supply without any shift in the output. The yellow wire is Out and goes to the Teensy's A0 input, and + is connected to the supply. Simple!

    ^ Going up? ^

View project log

  • 1
    Step 1

    Solder (in this order or you won't have much space left for the tip of your soldering iron):

    • U1, the long silk mask line points to pin 1
    • R3 (10k) and C2 (100 n)
    • R2 (10k)
    • C1 (10n)
    • C4 (100n)
    • R1 (1M), C3 (10n) and C5 (100n)
    • screw terminal
    • pin header
  • 2
    Step 2

    Done. Measure temperatures with it!

View all instructions

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