Part Number: LMP7721LMP7721 Guard RING's problem points:
The Faraday GUARD RING of LMP7721, namely GUARD RING, the middle input line, we understand is connected to LMP7721, but, is the outer metal RING connected to the ground?
How to implement…
Hi sir, Actually, I1 is source current fed from Source and Measurement Unit and I want to bias current from 1nA to 50nA using LMP7721 and get the output interms of voltage which is in range of 0.5v to 3.3v. Now, can I done this task with LMP7721? if yes…
Part Number: LMP7721 Hi,
The LMP7721 eval kit is set to a gain of 33, V+ is 2.5V and V- is -2.5V. Vref is ground. Non-inverting default mode. When a 1mV square signal is connected from a signal generator, I get the required output gain. But when I connect…
Part Number: LMP7721 I am using LMP7721 as buffer for signal conditioning of pH probe . I am using lmp7721 as buffer as shown in fig.
My problem is that when it is used as buffer it gives faithful output for some time only.I mean when I used it yesterday…
Part Number: LMP7721 Other Parts Discussed in Thread: LM4140 I am using LMP7721 for designing signal conditioning of pH probe.
I have taken sample of LMP7721 from TI (SMD packaging).
The problem with my LMP7721 is that it works fine for few days(hardly…
Part Number: LMP7721 dear all,
I would like to design a transimpedance amplifier for extremely low current detection (sub pA) in DC-500Hz. However, the shunt resistance of a photodiode is 50 Ohm, its very low. In this case, what types of a circuit are…
Hi Mohan,
Our applications engineer who covers the LMP7721 is currently on travel right now. I will provide some preliminary answers and when our other engineer returns this coming week he should be able to elaborate.
1. Is it unity gain stable…
Dear Raymond,
Thanks for your prompt reply and noticing about the missing images. I updated the post and included the circuits as you explained, thanks for that.
Based on your reply, I studied the Datasheets a bit more in detail and noticed the reduced…
Hello Jack,
The only information about the input capacitance of the LMP7721 is given in the applications section of the data sheet, which states that "the typical input capacitance of the LMP7721 is about 11pF." Based on how the data sheet is worded…
Hi Brian,
The LMP7721 voltage offset and bias current parameters have temperature coefficients as do the input current source and feedback resistor. The PC board can have thermocouples that are created where dissimilar metals come in contact with each…
