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Hi Jimmy,
Schematic looks okay to me. Few questions :
1. Are you using internal reference ?
2. What is the USB of LM2904V opamp that you have used in the DAC OUT and VSENSEP path ?
Thanks,
Sanjay
Hi team,
Yes, we are using internal reference.
LM2904V is used as a buffer between DAC81401 and external devices.
Hi Jimmy,
I wanted to know UGB - unity gain bandwidth (not USB) of the LM2904V (U24A, U24B). This is ensure the loop stability for DAC output.
Thanks,
Sanjay
Hi Sanjay,
The frequency response of LM2904V is as shown below. The signal we provide to the load is 0~10V, and the load operates in
Hi Jimmy,
DAC81401 output will be unstable with LM2904V as buffer in VSENSEP path. And also output signal BW will degrade with LM2904V as buffer in output path.
Please choose :
1. OUTPUT buffer : BW more than 1MHz
2. VSENSEP buffer : BW more than 3x BW of OUTPUT buffer
Thanks,
Sanjay
Hi Jimmy,
You can use the parts mentioned below:
1. OUTPUT buffer :TLV9101
2. VSENSEP buffer :TLV172
Thanks,
Sanjay