TLV2404: TLV2404ID -Transimpedance Amplifier Operation

Hey Krishna, 

Thanks for attaching the report, it provides a lot of details. However, could you please share the input (SMU) frequency? 
Looking at the test results, since some of the outputs are close to the rail (±5V), the op amp is entering into a non-linear state due to either: 

• I/O limitations
• Bandwidth limitation 

Additionally, could you please share why you have chosen to use the TLV2404 instead of the new alternative TLV9104? Is there a parameter of interest? 

I plan to use the following circuit design to facilitate the rest of the support, please feel free to reference it yourself if that is faster: Transimpedance amplifier circuit 

All the best,
Carolina

Hello Carolina

1)We had originally Chosen TLC2274 as we needed Dual Supply (+/-5V)& Input range of Current is +/-10nA to+/-1ma with 4 channels. 

1a)We tested TLC2274 & Found with 1K Feedback resistor all 4 channels saturate even with +/-0.1mA input Current

2)Since TLC2274 -SOIC package also did not have linearity and facing similar Saturation, one Equivalent was TLV2404

3)I am not convinced on ur answer of IO & BW Limitations as we are giving DC current and even with 1 Mega ohm feedback Resistor we are not getting proper linearity.

4)The Current input is only +/-0.3mA to +/-0.4mA for 1K Feedback Resistor, it Saturates at less than 1/10th of Max Input Current

5)How do you think with above requirement your Suggested Parts OPA170/OPA1671 will resolve the issue??- Please clarify

Thanks 

Krishna.P.N.

Hey Krishna, 

Understood on the DC test, no expected frequency.

TLV2404 is not an equivalent part to the TLC2274, it's about a tenth of the short circuit current. 
In the test report attached, the input current of ±400uA, this is outside of the spec of the device: 

Which explains why the test report shows non-linearity at the extremes: 

Instead I recommend testing with OPA4991IDR. Here is a test sim: TIA_2991.TSC

All the best,
Carolina 

Hey Krishna, 

Yes this can be done through your local TI sales representative. 
I will message you with their details. 

All the best,
Carolina 

Carolina

I have not heard from TI-Local Sales rep so far and i have sent 3 emails so far!!

Can u please check and let me know

Thanks

Krishna.P.N.