Joel,
The OPA847 is a rather sensitive device, it would be best to solder the device directly on a board and avoid bread-boarding at all cost.
In non inverting configuration, the minimum gain stable is 12V/V, with a flat frequency response for 20V…
Hello Ryuji,
There are a plethora of generic PCBs that you can use to evaluate our op amps. Most of the product names start with "DEM-OPA". Simply type that in the search box at www.ti.com and you will get a long list of options. I am not sure if…
Other Parts Discussed in Thread: DEM-OPA-SO-1A Hello TI engineers
I saw PCB for high speed amplifier DEM-OPA-SO-1A like a picture and I have 2 questions about this design.
1. Why top side has no ground plane?
2. Why ground plane at bottom side blank area…
Other Parts Discussed in Thread: LMH6554 , LMH6629 , OPA653 , OPA656 , OPA657 , THS4601 , LMH6601 , OPA2354 , OPA2355 , OPA2356 , OPA2357 , OPA3355 , OPA354 , OPA355 , DEM-OPA-SO-1A , DEM-OPA-SOT-1A Hi,
I have a voltage signal in the range of 10 µV which should be amplified…
Hello Samir and Livingstone,
In addition to Samir's comments, here are my inputs to your questions:
1) Photodiode / Mimicking a current generator: If you can use an actual photodiode for bench testing, I found some which are close to the 70pF terminal…
Other Parts Discussed in Thread: OPA656 , DEM-OPA-SO-1A , LMH6629 Hi,
I am using OPA656 to measure the power spectral density of the gate current of 745 pA.
I am using a VI on labview for the noise spectral density measurements. Please find attached the…
Hi Feixiao,
I bread-boarded the OPA657 as a transimpedance amplifier (gain = 22kV/A) and tested it with a bench generator and I got good results + no instability.
Here is the TINA-TI circuit which simulates closely with the measured results:
http://e2e…
Hi Michael,
Yes, those were our default first cut at the SMB settings. Here is a more recent set of settings with the override bits set: The DEMA/B are pulled to 1 by the SDA and SCL pull-up resistors. We are able to pull them down to a more reasonable…
Aaron,
If a part oscillates, it doesn't necessarily mean that you have damaged the part, however when op-amps oscillate they tend to self-heat and may end up damaging themselves.
Now that you've fixed the gain issue, here's a few other things you…
Hello Julien,
You could use TINA-TI to simulate the amplifier along with the expected loading from the ADS1251 and the parasitics from your PCB to see if you have a potantial stability issue.
With regards to testing functionality, I think when using…
