HI Kevin,
The overall circuit appears to follow the correct configuration similar to Figure 2 on the LOG114 datasheet. The LOG114EVM / datasheet examples suggest bypass capacitors for the V+/V- supplies but do not include a REF bypass capacitor. One potential…
Part Number: LOG112 Other Parts Discussed in Thread: LOG114EVM Has the evaluation board of LOG112 been released yet?How can we apply it?What is the part number of LOG112 EVM?
Hi Thomas,
LOG114EVM userguide shows results from 10nA to 10mA.
Is this circuit capable of masuring low currents in pA?
Do I need to make any change in the circuit or layout ?
We have created a similar board like LOG114EVM, still we are having same problem on the board.
Application: we are measuring leakage current by applying high voltage to insulation so we have long cable path. how can we handle this.
Part Number: LOG114 Other Parts Discussed in Thread: REF3040 , I modified the LOG114EVM board to create this circuit:
For the first step I didn't connect Vlogout to R5 in order to just evaluate the first amplification step.
Unfortunately I cannot…
Part Number: LOG114
Hi,
We are using LOG114 for measuring current ranging from 100pA to 8mA.
Our Iref is 1 uA. It is generated from a stable voltage reference diode and series resistance.
Output Vlog out is perfect when input is from 1uA to 8mA. When…
Hello Vanitha,
It would be helpful if we could see your LOG114 circuit schematic so that we can make sure that everything is properly connected. Also, an image of your PC board assembly might be useful.
Often, when there are issues obtaining the expected…
Other Parts Discussed in Thread: LOG114EVM , LOG114 I would like to feed a FET current to the input of the LOG114EVM. However, I'm concerned about grounding issues that might arise from the two voltage sources I use to drive the transistor (Vds and Vgs)…
Other Parts Discussed in Thread: LOG114EVM , LOG114 Dear Sir,
One of my customer is testing our LOG114EVM for very low current measurement. He is generating current (uA )by 5 volt and 100M ohm resistance.
He got good response of LOG114 at 1uA input but…
Other Parts Discussed in Thread: LOG114 , LOG114EVM Hi TI,
We are planning to use the LOG114 for optical measurement, and have followed the LOG114EVM design very closely. However, we'd like to understand the design a little better. The EVM has guarding…