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Original question:

TL7660: Operating frequency

TL7660: Inverting a low (2.5 V) DC signal with the TL7660

Camille Leclerc
Prodigy 120 points
Part Number: TL7660

I am in the process of finishing up the design of sensitive cascaded op amp system that will require ± 2.5 V DC supply to each op amp. Although I have a dual channel power supply (1760A B&K DC power supply) it would be optimal to only have to use one of the supply’s channel as I will need the other channel to power other hardware. I found the TL7660 to be a possible/promising component for my preliminary design and configured into the design below using figure 3 and 8 of the corresponding datasheet (had to make a mock model for the TL7660 on TINA):

However, I am not very knowledgeable on how voltage converters work and would like to confirm a few questions (apologize for my mundane questions):

  1. I want to confirm that the inverter is capable of converting a DC signal and not just AC signals. This previous post about the component makes me think it does… TI e2e.ti.com/.../tl7660-operating-frequency
    (The data sheets shows it has a switching frequency which I assume has to do with the internal IC system… but I am honestly unsure if it requires an external AC input to drive properly.)
  2. Will the output be an AC signal for a DC input due to the oscillation frequency?
  3. If I plan on coupling the inverted output of the TL7660 to the Vee rail of my op-amp, will the load of the op amps impede my ability to change the oscillator frequency down to ~ 1 kHz? (The signal I am trying to amplify with my op-amp system is modulating at 10 kHz so I don’t want additional switching noise at 10 kHz from the TL7660 to be coupled to the op amps.)

Additionally, I have a question regarding noise decoupling for my envisioned system as the 1760A B&K power supplies are quite noisy (if this question should be a separate/independent forum post please let me know).

  1. Other than using bypass capacitors to remove/compensate any transients of the power supply/TL7660 from coupling with the op amps supply pins… are LDOs a valid option to stabilize the Vcc and Vee supply voltages?

Thank you for taking the time to read my queries, I hope they are not an inconvenience.

PowerSupplytoRails.TSC