Hi Gordon Varney - Sir,
I think you already know that The PH value depends upon the temperature of the solution so We have referred to the datasheets (LMP91200 old version) We came to know that the LMP91200 has the features to connect the temperature…
Part Number: LMP91200 Hi Team,
My customer says that the old LMP91200 datasheet shows the pin 2, 3 is the CAL and RTD.
The pin description defines these 2 pin to measure the Temp. and do the calibration.
But in the datasheet on ti.com, and we found it…
Part Number: LMP91200
Dear Sirs, I want to use Your lmp91200 part to read isfet based ph sensor output voltage. I found out from Your datasheet and reference design it is foreseen for two electrode glass pH meters with guard. Isfet based ph meter is…
Part Number: LMP91200 Hi sir,
I have query regarding interfacing of lmp91200 ic not getting proper values on adc. I was tried to read analog signal using arduino nano board I have configured adc read in loop() at every 500 ms when i have change ph buffer…
Part Number: LMP91200 Hello!
Is the default setting of the LMP91200 to always have Vcm be 1/2 of Vref? The datasheet is not very clear on this, especially since there is a legacy option to select Vcm in 1/8 steps.
I would appreciate if you could confirm…
Part Number: LMP91200 Hi,
There are two sets of charts for bias current in the datasheet: for Device ON and Device OFF.
What does it mean Device ON/OFF ?
Regards
Krzysztof
Part Number: LMP91200 Other Parts Discussed in Thread: ADS124S08
Hi
I have designed pH measuring device. It is 4-20mA loop powered, isolated using flyback converter. It has STM32, ADS124S08 as ADC and LMP91200 as front end. All running on 3.3V. Vref …
Part Number: LMP91200
Hi
I see this post: https://e2e.ti.com/support/amplifiers/f/amplifiers-forum/657381/lmp91200-orp-sensing-using-lmp91200-ic
Which kind of suggests the input voltage is ±500mV around VCM. But this is for device switched off only isn…
Hi Gordon Varney .
Thanks you for your support during i'm facing with my problem.
I'm will make new PCB and replace connector with BNC and test again.
If i have same problem, i will come back
Thanks and best regards.
