Almost on-topic, because it's for an ambedded app.
Does anyone have a favorite method for conversion of a pulse and direction PWM signal to a bipolar analogue signal? I can do the obvious opamp approach, but I'm hoping that someone knows of a nice small IC that only needs a resistor and a capacitor, in a SOT-23 package, or even better 8 channels in a 30-pin SOIC??
Well, anything small will do :-)
Cheers
-- Trevor Barton
Hint: you can invert the gain of a an op-amp with half of a dual n-channel MOSFET.
Best regards, Spehro Pefhany
-- "it's the network..." "The Journey is the reward" speff@interlog.com Info for manufacturers: http://www.trexon.com Embedded software/hardware/analog Info for designers: http://www.speff.com
Just an idea:
XOR (74HC266) the two signals (PWM and DIR) and use an RC-network for LP-filtering and offset adding.
/Pär
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