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From: Gary Tait
Subject: Re: Frustrated over converting 8 bit bcd to serial data
X-Newsreader: Forte Free Agent 1.92/32.572
Date: Wed, 30 Oct 2002 14:04:09 -0500
NNTP-Posting-Date: Wed, 30 Oct 2002 14:04:25 EST
Organization: WorldCom Canada Ltd. News Reader Service
On Wed, 30 Oct 2002 17:12:56 -0800, "Jeroen" wrote:
>"MG" wrote in message
>> I am using a Burr-Brown PGA2311PA to create an active stereo headphone
>> volume control. This IC uses a three wire serial input to set the volume.
>> The serial input is of the form (R is the right channel volume setting
>> 0-255, and L is the left channel):
>> with each bit corresponding to a clock pulse. Now, let's say I use a 555
>> chip to supply the clock and one 8 position dip switch to set the volume
>> one of 256 levels. I want the R and L values to always be the same. What
>> else do I need to conver the dip switch setting into the 16 bit serial
>> above. Basically, I need something that converts 8-bit BCD into two
>> identical back to back serial bursts (One for the R channel and one for
>> L), clocked by the 555.
>You need a parallel to serial shiftregister.
Such as a 4021. Just run it twice.
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