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Instrumentation Amplifier Suggestion

Eyup Murat NASIR
Prodigy 10 points
Other Parts Discussed in Thread: PGA308, PGA309, ADS1130, ADS1230

Hello, 

I am on project about scaling human weight. I will use Loadcell and make platform scale. I will use an amplifier to amplifify signal level for measuring in 12 bit ADC on MCU.

Could you refer me a instrumentation amplifier, which is suitable for my needs. I want to amplify the output of LoadCell 500 - 1000 times(gain 500-1000).

Condition1 exc+ : 5V  exc- :GND    500kg loadcell / desired resolution 100g

Loadceel produces  2uV for 100g and 10mV for 500kg 

Condition2 exc+ : 12V  exc- :GND    500kg loadcell / desired resolution 100g

Loadceel produces  4.86uV for 100g and 24.3mV for 500kg 

LoadCell: Zemic  L6G 

http://www.zemic.nl/Products-Single-Point-load-cells/product-l6g-load-cell.html

Thanks

  • 0
    Expert 2585 points

    Hi,

    If you would like to use your load cell in the maximum range you will need PGA

    For 5V condition please look  at PGA308 or PGA309.

    As well, alternative  for MCU ADC could be ADC with  integrated PGA like ADS1130 (18-bit ADC) or ADS1230(20-bit ADC)