Re: need L290 substitute

Dave Platt wrote:
How fast do the bits change? Can you do it in software
with a PIC/AVR/8051? ...
Way to go.

Seems likely! At a trade show yesterday I picked up a sample of a
Silicon Labs 336D development "stick". The daughter board's micro is a
QFN20 device with an 8051-compatible core, 16 kB of flash code space,
768 bytes of RAM, a ten-bit 200 ksps 16-channel AC, and a single
10-bit current-output DAC, runs at up to 25 MIPS using its onboard
oscillator or at lower speeds (onboard or RC or crystal).

Writing a lookup-table-based quadrature-to-value loop with a DAC
output would be easy and fast. Cost for the bare chips from Mouser is
$4.31 in onesies, under $3 in hundreds.


That's one of the issues, the 8051 species are usually not exaclty a bargain. There is a price to be paid for reducing the effects of obsolenscence.


I'm sure that similar capabilities are available in other micro
families (e.g. PIC, TI MSP340, etc.). If you can accept a coarser DAC
output (e.g. a low-pass-filtered PWM or PDM output) then even a pretty
tiny jellybean PIC or AVR could do the job.


The MSP430F2002 can be had for close to a buck in quantities. If only TI wouldn't have dropped the ball on support. How is SiLabs' support?

--
Regards, Joerg

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Relevant Pages

  • Re: need L290 substitute
    ... Silicon Labs 336D development "stick". ... oscillator or at lower speeds (onboard or RC or crystal). ... And no design changes so far. ... TI wouldn't have dropped the ball on support. ...
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  • Re: need L290 substitute
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