Order Number LMM-8 or LMN See NS Package Number M08A or N08E. Order Number LMM-8 or LMN See NS Package. versions (LM, LM) and its output swings. Solenoids Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2All trademarks are Product Folder Links: LMN LMN. LMN-8 Datasheet, LMN-8 National Semiconductor Frequency to Voltage Converter Datasheet, buy LMN
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Post any general technical questions here. I had the idea to use an LMN-8 frequency to voltage converter and after reading through the data knocked up a circuit.
I have now read that the datsaheet of this chip is limited to this ammount so I need some ideas dataaheet on how to boost the output so it can reach 16v DC at around Hz input. Do I need a transistor amplifier? Thanks for any help. If it is just the output voltage that is low you might be OK with an op-amp on a single supply – after all the output doesn’t need to swing negative.
Op-amps such as the LM are intended for single-supply operation LM is quad, not sure if there is a single version. Only problem is that you don’t get a linear response near 0V. Is there any way of applying a positive offset of say 0.
Set the split to give at least 16V on the positive side, and a lower negative side hopefully enough to give linear response from the amp down to 0V.
You need to experiment to see if this would work though – it’s not something I’ve had the need to try.
Alternatively a simple transistor dztasheet might work. Simon Carter Electronics http: There is another version of the same chip LMN-8 which doesn’t have this zener so I will try one of those first I think, Vcc will be 24v to the chip so higher output voltage should be possible.
The NS datasheet is poor at explaining this difference but at least one of the example circuits using the has a v output with a 15v supply.
According to the formulas I should be good up to 30K Hz input it previously stopped increasing at 3Khz not 30 as I had written previously. I chose the zener version because it offers output stability with supply rail fluctuations which I will have off an alternator, but I think I will try and limit those with a regulator on the supply instead now.
Remember that the drop-out voltage of a standard 78x regulator is V, so a probably won’t work.
lmm2917n-8 You might have to use a lower voltage regulator, a low drop-out type or an LM or similar adjustable regulator set to around 20V or so. I’ve hooked up an LM now to supply 20v as you suggested.
Just waiting for my new chip and I’ll report on the results.
datashdet I installed it all on a diesel shunting locomotive yesterday and it now has a working tacho for the first time in many years. The only thing that might kill it now is low temperatures as the LM regulator I had on hand was a ‘T’ version which is only good down to 0 degrees C, I may have to upgrade it to an ‘AT’ version at a later date good for degs.