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DIY Stompboxes => Building your own stompbox => Topic started by: zachary vex on May 05, 2004, 04:46:55 PM

Title: can someone recommend a stand-alone 8-bit adc?
Post by: zachary vex on May 05, 2004, 04:46:55 PM
i need to do analog-to-digital conversion for a controller circuit, 8-bit, cheap (hopefully around $2 each in 100 quantity.)  my searches for an inexpensive solution are leading me to uP-controlled chips... i just want it to continuously convert with minimum parts count.  power consumption isn't terribly important (non-battery application.)  DIP only.
Title: can someone recommend a stand-alone 8-bit adc?
Post by: rocket on May 05, 2004, 04:57:23 PM
There are several ADC080x (x is 1,2..) types, and the ZN427 (I think its 427 or maybe 417) both should be cheap.

I can't really recommend them because I have no experience with them - I just know the part numbers.
Title: can someone recommend a stand-alone 8-bit adc?
Post by: rocket on May 05, 2004, 05:03:54 PM
I am afraid those are not µPcontrolled, though.
several atmel chip have a/d converters but won't be that cheap
maybe PICs ?
Title: can someone recommend a stand-alone 8-bit adc?
Post by: Brian Marshall on May 05, 2004, 05:30:23 PM
i wish i could help.
Title: can someone recommend a stand-alone 8-bit adc?
Post by: Ry on May 05, 2004, 05:44:34 PM
The TLC0838CN from TI might do what you want, and it looks (at a very cursory glance) to cost about 1.55 per 1000, you might go a little over your $2.00 per 100, though (digikey has them at 2.05/100).

It does stand alone operation and is a through-hole IC.

http://focus.ti.com/docs/prod/folders/print/tlc0838.html

Other possibilities are listed here:

http://www.rutronik.com/highlights/aktiv/analog_ics/mix_sig_con_ics/8_10_12_14_16_conv_ti.htm

Ry
Title: can someone recommend a stand-alone 8-bit adc?
Post by: puretube on May 05, 2004, 05:54:38 PM
simplest solution are the ZN425/-6/-7 series, but not necc. cheap, (6$ ?),
and maybe out of prod. by now... (ya can still find`em, though).
(IIRC: TTL-compatible...)

(rocket: he seems not wanting µP...)
Title: can someone recommend a stand-alone 8-bit adc?
Post by: zachary vex on May 05, 2004, 08:01:20 PM
i neglected to mention... it has to be parallel output.

i've gone over all of the TI pieces and i just don't seem to find any 8-bit standalone analog-to-digital converters with parallel output for a price i can deal with...
Title: can someone recommend a stand-alone 8-bit adc?
Post by: zachary vex on May 05, 2004, 11:39:39 PM
ok, i found one, still a mite expensive, but at least it is a standalone.

ADC080x  where x is 1-5
Title: can someone recommend a stand-alone 8-bit adc?
Post by: puretube on May 06, 2004, 02:14:21 AM
Quote from: zachary vexi neglected to mention... it has to be parallel output.

i assumed that..

AD0820
AM2502



.........ooops, too late
Title: can someone recommend a stand-alone 8-bit adc?
Post by: smoguzbenjamin on May 06, 2004, 01:06:08 PM
Check out maxim (//www.maxim-ic.com) They sent me some brochures a while back and they have some interesting ICs available at pretty OK prices.
Title: can someone recommend a stand-alone 8-bit adc?
Post by: Peter Snowberg on May 06, 2004, 01:50:22 PM
I hate to say it but you're probably better off going with a microcontroller and writing a tiny bit of code. Take these chips for example: http://www.st.com/stonline/books/pdf/docs/8348.pdf Mouser has them for (ST7FLITE05Y0B6) as low as $1.40 in singles. That would give you 8 bit A/D and system timing in a DIP16 package. That's a bit smaller and cheaper than an ADC0804, but now you need a programming step in the assembly.

$2.54 / 100 qty. for ADC0804 is pretty nice. (National/Mouser)

Take care,
-Peter
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