Part Number: OPA858
I am planning to use OPA858 as the Transimpedance Amplifier for the following TIA circuit. C2, R8 are to AC couple the circuit:
In the data sheet of OPA858, it recommends using this layout with Riso in order to reduce the resonance…
Hi Sima,
Thank you for the clarification.
How do I calculate the value of my output isolation resistor?
Following this thread you linked: https://e2e.ti.com/support/amplifiers-group/amplifiers/f/amplifiers-forum/987143/opa858-another-photodiode-amplifier…
Hi Chi,
for a bandwidth of 100MHz I would make it this way:
I would leave the feedback loop of OPA858 untouched and would make all the gain switchings later in the signal chain.
Kai
Hi Kai / Sima,
thank you both for the above and sorry that it's taken me a while to get back to you both ( I've been diverted onto another project this past week ).
Taking inspiration from your collective thoughts, I think I now understand the…
Part Number: OPA858 Other Parts Discussed in Thread: OPA847 , OPA855 , OPA820
Hi,
I am currently designing a photodetection board, based on a transimpedance amplifier, to characterize the time propoerties of a LED driver board.
Requirements :
- Transimpedance…
Part Number: OPA858 Other Parts Discussed in Thread: OPA855 , LMH5401 , SN74LVC2G66-Q1 , LMH34400 I wouild like to use PSpice for TI to simulate a circuit using the OPA858 and OPA855, but the models are missing the disable function which we need to simulate…
Part Number: OPA858 Other Parts Discussed in Thread: OPA855 Hi Expert,
My customer is using OPA858 as a current source, but it couldn't work normally. could you help to give some advice? thanks.
Thanks.
BR
Chi
Hi Sima,
thanks for aking. I had to make a redesigned board to test it so I have to wait unti i can use that for testing.
But what helped to stop hf ringing was to replaced OPA858 by its similar type OPA859. I know it is quite slow in comparsion to OPA858…
Part Number: OPA858 Hi Expert,
My customer is using OPA858 in optical module, but for the power sequence, they will power up Vin+ and Vin- to 2.5V reference voltage, and then power up the Vs.
based on datasheet, we will see the ESD path from Vin to Vs…
Part Number: OPA858 Hi Expert,
my customer designed a TIA application using OPA858, DC gain is 30K, AC gain is 100K, when PD received a light, there is no AC signal in output. could you help to give some advice?
BR
Chi