remove saa7030

[pisky]

Hi to everyone,

I have a nice old Marantz cd-74.
I have found the datasheets about saa70xx and the service manual about it.
I see that probably is it possible remove the digital filter saa7030 and use saa7000 directly to the two dac tda1540p.
The big problem of this cd-player, maybe is the jitter. I have read in this forum that the kwak clock work also with 4,32 crystal.

For you is possible do these modification?

Bye
Pisky

[rfbrw]

Originally posted by pisky
Hi to everyone,

I have a nice old Marantz cd-74.
I have found the datasheets about saa70xx and the service manual about it.
I see that probably is it possible remove the digital filter saa7030 and use saa7000 directly to the two dac tda1540p.
The big problem of this cd-player, maybe is the jitter. I have read in this forum that the kwak clock work also with 4,32 crystal.

For you is possible do these modification?

Bye
Pisky

Why not use a single TDA1541A instead?

[pisky]

Originally posted by rfbrw



Why not use a single TDA1541A instead?

Yes, maybe is possible but I want try to use saa7000 directly to the double dac.

[rfbrw]

Originally posted by pisky


Yes, maybe is possible but I want try to use saa7000 directly to the double dac.

There is no maybe about it. It is easier to connect the TDA1541A. But as you wish to use the TDA1540P, you will have to put the SAA7000 into 14 bit mode. See the SAA7000 datasheet.

[pisky]

There is no maybe about it. It is easier to connect the TDA1541A.

yes you have reason.


reading the datasheet of saa7000:

PIN6: CLOX buffered clock output (XTAL1)

PIN16: 14/16 select bit lenght of clock burst output from CLCF.

PIN14: clock burst output of either 14 or 16 bit as selected at pin 16. It is used to clock data from DLCF and DRCF.

PIN15: Right channel data output: format is two's complement or offset binary, as selected at DAEC (PIN4).

PIN13: Left channel data output: format is two's complement or offset binary, as selected at DAEC (PIN4).

PIN4: DAEC, serial data samples are recived at DAEC in two's complement form. The data is in 16 bit words separate by gaps; each word comprising two 8 bitsymbols.

PIN11: STR2 active high strobe pulse of 2 CLOX cycles duration occurring every 24 CLOX cycles and use to strobe data to the DACs. This pin should be left disconnect if SAA7030 is not used.

PIN12: STR1 active high strobe pulse of 2 CLOX cycles duration occurring every 96 CLOX cycles - after each pair of words have been clocked out. It is use to strobe data to SAA7030 or to the DACs if SAA7030 is not used.

So I can disconnect pin 11 of saa7000 and connect pin 12 of saa7000 directly to pin 2 of DACs.

Disconnect pin 16 to the ground and connect to +5v for set 16bit.

Connect pin 14 of saa7000 to pin 28 of DACs (clock pulse input).

Connect pin 13 of saa7000 to pin 1 of DAC (DLCF) and connect pin 15 of saa7000 to pin 1 of DAC (DRCF).

Disconnect pin 6 of saa7000 (CLOX).

The last idea is disconnect also the quartz and use a KWAK CLOCK.

What do you think about?

Bye
Pisky

[rfbrw]

Seems about right but I would remove the SAA7030 completely and link across from input to output.

Pin20 DLCF to Pin3 DLFD.
Pin17 DRCF to Pin10 DRFD.
Pin18 /CLCF to Pin6 /CLFD.
Pin21 STR1 to Pin7 LAT.

[pisky]

I have found a lot of information on this site:

http://tube.freeweb.hu/index.html

Unfortunately I don't speak Hungarian.
Is there someone that can translate the webpage?

Bye

[pisky]

Originally posted by rfbrw
Seems about right but I would remove the SAA7030 completely and link across from input to output.

Pin20 DLCF to Pin3 DLFD.
Pin17 DRCF to Pin10 DRFD.
Pin18 /CLCF to Pin6 /CLFD.
Pin21 STR1 to Pin7 LAT.

For example:
Pin20 of SAA7030 DLCF originally is connect to PIN13 of SAA7000, and PIN3 of SAA7030 is connect to PIN1 of TDA1540.
Pin17 of SAA7030 DRCF originally is connect to PIN15 of SAA7000, and PIN10 of SAA7030 is connect to PIN1 of the other TDA1540.

I want instead connect PIN13 and PIN15 of SAA7000 directly to PIN1.

it is the same thing.

I think is possible connect directly SAA7000 to TDA1540

Bye
Pisky

[rfbrw]

Originally posted by pisky


For example:
Pin20 of SAA7030 DLCF originally is connect to PIN13 of SAA7000, and PIN3 of SAA7030 is connect to PIN1 of TDA1540.
Pin17 of SAA7030 DRCF originally is connect to PIN15 of SAA7000, and PIN10 of SAA7030 is connect to PIN1 of the other TDA1540.

I want instead connect PIN13 and PIN15 of SAA7000 directly to PIN1.

it is the same thing.

I think is possible connect directly SAA7000 to TDA1540

Bye
Pisky

Its just a suggestion but I would not leave the SAA7030 running if I were you.

[pisky]

Ah ok I understand.

For you is better completely disconnect the SAA7030, is it correct?

Sorry but I don't speak english very well