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From: email@example.com (Tim Shoppa)
Subject: Re: digital voltmeter and ammeter
Date: 20 Jan 2003 07:34:13 -0800
References: <3E2AB7F8.firstname.lastname@example.org> <3E2ABEF9.email@example.com> <3E2AC2FE.firstname.lastname@example.org>
NNTP-Posting-Date: 20 Jan 2003 15:34:14 GMT
Spehro Pefhany wrote in message news:...
> On 19 Jan 2003 13:35:52 -0800, the renowned email@example.com
> (Tim Shoppa) wrote:
> >Alex Graham wrote in message news:<3E2AC2FE.firstname.lastname@example.org>...
> >> Yep, a slow one is fine. I need simply to output to either some 7 seg
> >> displays or a LCD. Any suggestions on the actual ADC chip?
> >If 3 and a half digits are enough the ICL7106 (drives LCD) and ICL7107
> >(drives LED) are the granddaddies of the field (must be 20 years old by now).
> More than 25 years old. They won't drive modern multiplexed displays,
> such as these ones, http://www.trexon.com/leds/trexon_led_display.pdf
Pot-AY-toes, Pot-AH-toes. I like non-multiplexed displays, personally;
less switching noise (though that will be a complete non-issue in a
That said, are there any more-modern 3-1/2 digit all-on-one-chip panel
meter type A/D->LED display chips with on-chip reference? Or is
the modern solution to use a PIC?
For a recent project I used a microcontroller with 8 A/D converters
and output composite video with all 8 readings; that was fun :-) (Although
I only used 8-bit converters.) "Cheap Video Cookbook" still lives, just
in case Don Lancaster happens to be reading...
> and their nominal 8mA/segment drive current is too much
> for modern LEDs as well.
The 7107 data sheet tells you how to cut this for power dissipation
reasons (although "too bright" is a complaint that I rarely hear.)
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