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Part Number: LPV7215
Hi I have one question regarding LVP7215M, Does this really generate Square wave @ voltage 1.8 with 580nA..?
I would like to design 1.8v battery based wave form generator with combination of LC and R. if this will not suite my purpose, kindly suggest if any different device fulfill my needs as well.
FYI: I don't have a simulator for this chip.
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The comparator itself will draw 580nA steady-state, but there is also the external resistor dividers and charging current for the capacitor that will add to the supply budget.
You can make the resistors large, but you have to watch making the capacitor too small - or you have to account for stray capacitance.
Comparators also draw peak currents when the output transitions. These peak currents usually occur while the output is moving and they can be many times the quiescent current. This current gets averaged by the bypass cap, but the result is a rising average supply current vs output frequency.
What is the frequency range you are interested in? The faster you go, the more current that will be needed for the faster prop delay spec.
We have newer devices with even lower supply currents, such as the TLV7031(330nA) or even the TLV3691 (70nA). These two both have SPICE models.
But your choices are dominated by the required propagation delay required to achieve your frequencies of interest.
Please see the following appnotes and TI Precision labs presentation:
Relaxation oscillator circuit Appnote TINA file: http://www.ti.com/lit/mo/sbomao3/sbomao3.zip
2103 - Comparator Applications 3.pdf (see Maximum Toggle Frequency - Page 16)
TI Comparators (CMPS) Applications Group
In reply to Paul Grohe:
In reply to RANGANATHAN MANIKANDAN:
a maximum frequency of about 100kHz seems realistic with the TLV7031:
In reply to kai klaas69:
For the upper range of your frequency requirements you will need to switch to our faster version of the tlv7031 which is the TLV7011. This comparator is approximately 10x faster and should get you to your 1MHz max target. Operating at 1.8v will not be a problem and the quiescent is around 5uA in idle state. Models for this comparator are also available.
I have simulated your file, but i can see new scenario.. the waveform swing top and bottom..
Is that real scenario.. (or) for only simulation.
please find the screen print for your reference.
thanks and regards,
change the scope settings:
Also set "Mode" to "Normal".
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