Does anyone know of a single chip (a few support components are ok) that meets or comes close to these requirements:

PWM generator either:
Logarithmic, 8 bits or more
Linear, 12 bits or more

Duty controlled by SPI/I2C/other serial interface.
Duty 0% possible

3 channels or more (or 1 ch and very small)

DIL(preferably)

Tah, Dave

 

It sounds like what you are describing is a small microcontroller such as an AVR or a PIC.

I know the AVR by ATMEL has an 8-pin DIP packaged microcontroller (ATTINY series) that can generate a PWM output with 8-bit or 16-bit counter/timer resolution. It also has the SPI interface. It would seem that with a bit of programming you could design would you need.

hgmjr