Other Parts Discussed in Thread: TINA-TI , LMP7715 , LMP7721 Tool/software: TINA-TI or Spice Models Hello.
Recently, I was going through "Analog Engineer’s Circuit Cookbook: ADCs" as provided among the cookbooks provided by TI. In this, I have been…
Hello Benjamin,
You will need a couple of amplifier stages to convert the pH probe current output, to a voltage range compatible with the XTR111 input. Have a look at the LMP7721 datasheet, Figure 50. - LMP7721 applied as a pH Electrode Amplifier.…
Other Parts Discussed in Thread: LMP7721 , LMP7715 I have the LMP7721 multi-function evaluation board and would like to use it in TIA mode with frequencies in the 1-10 MHz range. Will I run into any issues with either the LMP7721 or the LMP7715 guard…
Hello David,
When using an op amp in an "ideal diode" application, the op amp becomes open-loop for conditions where the diode is not conducting. This forces the output to saturate until the output returns to a condition that allows the diode to forward…
Hello Mica,
I assume you mean Figure 18. Yes. It should denote "per channel" in the label.
Both channels will be powered, even if you are just using one. You cannot turn one channel off. So the LMP7716 (dual) supply current always be twice the LMP7715…
Hi Sami,
PLEASE verify the wiring of the LMP7715 guard driver. Your schematic above is old and does not match the current layout (IC1 is still a LMP7721 in the schematic). Looks like Pin 1 (output) is not connected to -IN/R3 net.
IC2 (LMP7721) looks…
Other Parts Discussed in Thread: LMP7721 , LMP7715 We have the following problems with the LMP7721, and we do not know if it is caused by our mistaken design, if some people already have the same experience, please help us.
The following is the condition…
Other Parts Discussed in Thread: IVC102 , LMP7715 Dear community,
After very close examination and study of IVC102's datasheet I have made two versions of PCB layout.
I have attached pdf files of each in zip. Blue is the bottom, red is the top side…
Part Number: LM27762 Other Parts Discussed in Thread: PGA117 , TS12A12511 , OPA197 , LMP7715 Background: We have designed a specialized instrumentation system with embedded micro controller/s. Basically the instrumentation on board consists of 10 high…
Hi Ishara,
The simulation is correct.
There is a -9uV difference between ground and the guard. The LMP7715 has a (optimistic) offset of -9.96uV, so you are seeing the addition of the buffers offset voltage.
Also, the input node (LMP7721 negative…
