DIY CD drive based on a computer CDROM

[rfbrw]

Originally posted by kairon
Would the DS80C320 (8052 compatible) be a good chip for controlling something like a cd drive?

For play,stop,fwd,rev and pause, the DS80C320 would be enough. For anything more complex e.g. playing back audio through the IDE interface, the DS80C320 will not be enough.

ray.

[rfbrw]

Originally posted by Oli
I Picked up a cheap NEC CDR500 CD ROM drive at the weekend (SCSI). I have already taken it to pieces- a nice aluminium cast assembly like a CD-PRO mechanism. Unfortunately I was not too observant and there is no S/PDIF out! Looking on the board I have found a TDA1545A (with I2S bus). I wish to use the I2S, together with a CS8402A to provide me with a nice S/PDIF output so I can use with a variety of equipment (I know it is not the ultimate!) Of course I am going to reclock the transport. Currently the clock operates at 384 x fs (44100). However the Crystal Semiconductor transmitter only operates at 256 x fs

My question to others is- will a divide by 1.5 clock divider circuit (using flip flops and logic) result in significant jitter? Is there an alternate transmitter on the market that will operate from 384 x fs (44100) ?

AKM AK4101/AK4103
TI DIT4096/DIT4192

ray.

[Oli]

Just checked the data sheet for the first item you suggested- It seems to be just the ticket- no clock devision required!

CHEERS!

[Matttcattt]

Originally posted by Lupulroz
Mattcatt, in your schematic couldn't be 16F84 (only 18 pins). Anyway I'm working on a version with 16F8xx that supports LCD display and remote. The first attempt of sound will be with AD1892 receiver with some reclocking.
The ATA specs are really a mess; I hope I can transform data into I2S with a help of a CPLD; otherwise a DSP will be the only alternative to make a good standalone CD.

oops, im so used to typing it, i forgot its meant to be a PIC16F877.

i hope to hear of your project

[Matttcattt]

also, i have not had any answer about the DACs. the links are:

One Two Three

[Lupulroz]

For sure I will not go for a dac with digital filter inside.

[frenzic]

Me neither.

[Matttcattt]

Originally posted by Lupulroz
For sure I will not go for a dac with digital filter inside.

Originally posted by frenzic
Me neither.

why?

could someone point me to a DAC tutorial? the datasheets are not very helpful.

[rfbrw]

Originally posted by Matttcattt
why?

Fashion? Dogma? Satan uses a dac with a built-in filter?

could someone point me to a DAC tutorial? the datasheets are not very helpful.

Not a tutorial and based on rather old IC's, Analog Devices' AN-394 application note gives a useful insight into the design of a dac and AN-283 covers the bitstream type dacs, the type of dac ic that usually comes with a built-in filter.
You might also find this useful
http://members.chello.nl/~m.heijlige...tml/dactop.htm

ray

[Matttcattt]

Originally posted by rfbrw

Fashion? Dogma? Satan uses a dac with a built-in filter?


Not a tutorial and based on rather old IC's, Analog Devices' AN-394 application note gives a useful insight into the design of a dac and AN-283 covers the bitstream type dacs, the type of dac ic that usually comes with a built-in filter.
You might also find this useful
http://members.chello.nl/~m.heijlige...tml/dactop.htm

ray

thanks, ill have a look when i have a chance.