X-fs from WS (PLL)

[blu_line]

Hello,

I need a PLL which can derive an X-fs from a I2S WS signal !
There must be some standard chip to do this i guess ?!

Any one an idea ?

grtz

Simon

[rfbrw]

Originally posted by blu_line
Hello,

I need a PLL which can derive an X-fs from a I2S WS signal !
There must be some standard chip to do this i guess ?!

Any one an idea ?

grtz

Simon

One or two. What is X ?

[blu_line]

fixed integer ranging from 64 to 768

grtz

Simon

[rfbrw]

Originally posted by blu_line
fixed integer ranging from 64 to 768

grtz

Simon

I can think of three options.
1. A 768Fs VCXO, a Philips 74HC4046/7046/9046 PLL and a divider.

2. One of AD's DDS chips http://www.analog.com/en/subCat/0,28...0%255F,00.html

3. One of AD's PLL synthesizers.
http://www.analog.com/en/subCat/0,28...0%255F,00.html

[gmarsh]

I've built this circuit a few times, here's my recipe:

- ADF4001 PLL synthesizer from ADI
- 3rd order PLL filter with ~20Hz F1 frequency
- VCXO
- 12C508A PIC for configuring ADF4001, if there isn't a host controller around to do it.

Google for "Dean's Book", written by a National Semiconductor PLL designer. It's a great reference for designing this kind of stuff.

[rfbrw]

http://www.national.com/appinfo/wire...Deansbook3.pdf
http://www.national.com/appinfo/wire...sBook_4_01.pdf

Philips have a comprehensive application note for their 4046/7046/9046 PLL's but it is order only.

[blu_line]

thanks for all your suggestions !
I'll look in to it.

grtz

Simon