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[DPRG] Winbond Voice Recorder - Design Guide?

Subject: [DPRG] Winbond Voice Recorder - Design Guide?
From: Kenneth Maxon kmaxon at qwest.net
Date: Tue Feb 19 16:26:38 CST 2008

A previous girlfriend built up a working demo board around Winbond's ISD2560
device and took the time to build a web page about it...

This may have some of the data that you are looking for.

-Kenneth


-----Original Message-----
From: dprglist-bounces at dprg.org [mailto:dprglist-bounces at dprg.org]On Behalf
Of DeltaGraph at aol.com
Sent: Tuesday, February 19, 2008 1:06 PM
To: dprglist at dprg.org
Subject: [DPRG] Winbond Voice Recorder - Design Guide?


Hello,

Anyone out there  have a design guide for Winbond ISD1700 series voice
recorder chip?

I requested their design guide a week+ ago, then again yesterday, no
response -- other than a response from their sales department when I wrote
them and they sent an email to the same email link I had sent to.

If I can't get an answer --
I am getting pretty serious about doing my own recorder. Flash is cheap.
AVRs have nice A/D leaving the question open whether to do PWM with fancy
filter (Atmel has an example using a 6th order filter) or to go with a DAC /
resistor ladder and maybe much simpler filter.

That is the nice thing about Winbond chip -- incorporates filters for  input
and output
simplifying the design... Also, has a Class D speaker driver built on the
chip.

I only need about 10 to 20 seconds of recorded speech.
certainly I could use Winbond chip with button interface, but really wanted
to go with SPI.
Also, I think that SPI is needed for that series to control things like
input source microphone vs line input..



Ron







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