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Part Number: INA333
Tool/software: TINA-TI or Spice Models
I have been working with the Tina sim program. I was using an outdated sim model... since corrected...
I have 2 issue...
1) The Ref pin 5... on my PCB card seems to be sourcing +VCC .... I should be able to swing the pin using OPA333 ... The Tina program shows the Ref, but in the real PCB the pin never changes..?
2) I still can't get the real chip to flip its output... regardless which part of the bridge resistor I change..?INA333 WSB Sensor Redundant Circuit Oct 1B 2017.TSC
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In reply to Herman Theodorus - WEBENCH Design Center:
Over the past few weeks I have enjoyed working with the INA333 WSB chip. The chip is working very nice. I did how ever see something in the technical specification sheet that makes me wounder?
My boss as me to write and get a response to this question. On the first page, Section 3 description, it suggest that only one resistor is needed to set the gain from 1-1000... On Page 5, Section 6.5 specification
list the "Range of Gain", =1000 V/V, yet on page 13, Section 7.3, the "Feature Description", summary states that the chip has the capacity to have a gain of 10,000?
Would you be kind enough to explain the difference in operations... I have operated the chip with a gain setting of ~3000 and it works just fine... is there any reason to limit the Gain to just 1000 or can this chip
operate at a higher gains without causing any problems?
With warm regards,
-eINA333 WSB Circuit Nov 11 2017.pdf
In reply to Eddie Sines:
In reply to Ian Williams:
Thanks for looking into this... The application is low frequency and did a prototype circuit and set the Gain to 2800 and it worked fine. Personally I think the chip can do more... the out put was low noise and stable.
Now I am turning my attention to finding a electronic means of changing the Gain or using the INA333 as the front end for a microprocessor design. I look forward to
reading your response.
I can confirm that the information in section 7.3 is a typo. The official specification for maximum gain on the INA333 is 1000V/V. While some units may achieve higher gain, we do not guarantee any level of performance past 1000V/V. If you need a precision INA with higher gain, you can select from the devices listed here.
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