TLV2254: TLV2254 noise Vpp compared with TLV9064

Damien Zhang

Part Number: TLV2254
Other Parts Discussed in Thread: TLV9064,

dear all,

i'm in a project that need to amplify photodiode output current signal. after signal transfer from current to voltage, i need to amplify this signal multiply 300 through 3 OPA stages.

I found for same schematic and same board but just replace OPA device from TLV2254 to TLV9064, the output signal will bring much noise. i compared input voltage noise density between TLV9064 and TLV2254, TLV9064 is better than TLV2254. But for input current noise density and Peak-to-peak equivalent input noise voltage from 0.1Hz to 10Hz, TLV2254 performance is better than TLV9064.

I know photodiode output signal with a very low BW, so i want to ask which spec mainly influence my photodiode amplify output noise Vpp performance?

thanks so much.

over 5 years ago

0 kai klaas69 over 5 years ago

Guru 140200 points

Hi Damien,

at frequencies below 1kHz the TLV9064 generates much more noise than the TLV2254. Have a look at figure 50 of datasheet of TLV2254 and figure 16 of datasheet of TLV9064.

Kai

0 Damien Zhang over 5 years ago in reply to kai klaas69

TI__Intellectual 1175 points

thanks a lot for your reply. two more question:

1st: when i choose new OPA device on ti.com, i found no any item could meaning low frequency noise performance. 1KHz noise voltage not enough to meaning it. how can i choose a good performance OPA device in below 200Hz? do we have some slides for showing these parts? you also could directly send to me: damien-zhang@ti.com

2nd: for different EE, small signal needs different performance OPA. which EE need to notice low frequency noise voltage performance? do we have some summary slides or onsite training about that different EE to notice different bandwidth?

thanks so much.

0 kai klaas69 over 5 years ago in reply to Damien Zhang

Guru 140200 points

Hi Damien,

yes, you are right, that should be improved. That bothers me, too.

Kai

0 Damien Zhang over 5 years ago in reply to kai klaas69

TI__Intellectual 1175 points

thanks a lot. any slides about my applying please share to me. thanks for your reply :)

0 Dennis Goeke over 5 years ago in reply to Damien Zhang

TI__Genius 11135 points

Damien

We do not have a separate selector guide to help with the search, however if you search on low noise and zero drift this may reduce the number of results you get.

If you need some more information on this you can message Precision Amps Marketing directly...

Regards
Dennis

0 Damien Zhang over 5 years ago in reply to Dennis Goeke

TI__Intellectual 1175 points

thanks a lot. :)

0 Damien Zhang over 5 years ago in reply to Dennis Goeke

TI__Intellectual 1175 points

thanks a lot :)

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TLV2254: TLV2254 noise Vpp compared with TLV9064