Part Number: OPA838 Tool/software: Hi,
Could you please confirm the OPA838 power-down operation?
The question is whether this is simply a reduction of supply current or an actual disable with output disconnect.
Is the output still driving while in Power…
Part Number: OPA838 Tool/software: Hi,
I am implementing a transimpedance amplifier based on the OPA838 and I am experiencing oscillation. The following circuit (figure 1) has been implemented based on the sensor specification and the Application and…
Part Number: OPA838 Tool/software:
I have basic questions about the following configuration of an Op-Amp, which is transimpedance amplifier , I would appreciate your help to help me understand this:
First question, considering that the positive…
Hi,
One device that is pin to pin compatible with the OPA838 and is unity gain stable is the OPA837. This device could be an option as a quick drop-in replacement without reworking the board. There is also the OPA810 that comes in this package that is…
Hello Behnam,
I have been working on lab projects and will be busy this week and next week. Please add your updates here, but I am not able to provide an update on my progress at this time.
Best,
Alec
Part Number: OPA838 Dear all,
I want to choose an accurate vale for an isolation resistor for my OP-AMP (OPA838), based on the datasheet OPA838 is very sensitive to capacitive loads and for make the system robust to instability we need to add an isolation…
Part Number: OPA838 Dear all,
In the datasheet of the OPA838 there are the following recommendations for PCB layout:
1.Signal routing must be direct and as short as possible into and out of the op amp.
2. The feedback path must be short and direct avoiding…
Part Number: OPA838 Dear All,
I have designed a transimpedance amplifier as follows:
I leaned that loading effect can be detrimental to OPA circuit and is very important to be considered. I want to consider and design the output circuit in my PCB for…
Hello Behnam,
We recommend adding pi filters at the supplies. This type of filtering at the supplies are commonly used to reduce noise in our EVMs. An example of this pi filter can be seen in the THS3491EVM .
I talk about this concept more in this e2e…
Part Number: OPA838
Tool/software:
Dear Engineers,
I have designed a transimpedance amplifier as follows:
Based on the simulation, I should get around 58 dB for SNR @3MHz:
But what I achieved in my experimental results is as follows:
- Supply vo…
