AK7720a Datasheet (repost)

highly · 9th March 2007, 02:04 PM

Reposted from Car Audio. Suppose this is a more fitting place.

I was wondering if anyone out there would happen to have the datasheet for the AKM AK7720a DSP. Specifically interested in the data type, word length, and clocking method of the SDOUT on (I believe) pin 17. I have searched the net but only found reference to pinouts in a Clarion service manual that I ran across. AKM does not have the datasheet posted online, but I have attempted to contact them for a datasheet. I'm not holding my breath on that one.
Thanks!

Netlist · 9th March 2007, 02:14 PM

Here is some more info, in case you would have missed it:

http://www.elitecaraudio.com/forums/...6&pagenumber=9
http://www.asahi-kasei.co.jp/akm/en/...a/ak7720a.html

/Hugo

highly · 9th March 2007, 04:42 PM

Thanks.
Thus far using the block diagram from the AK page and a schematic diagram from a service manual for a consumer product that uses this chip I have worked out that there should be a non-switched digital output from the DSP on pin 17. The DSP can either use its internal DACs (as it is in my case) or to use external DACs based on the state of internal switch configuration. According to the block diagram, however, Dout0 is not affected by that internal switch register. From what I can gather, it appears to be a PCM output. My hopes are to use this digital out to run an offboard DSP crossover/DAC over S/PDIF. Before forging ahead I was hoping to get a datasheet that shows 1) that this output should be available even if the primary DSP output path is to the onboard DACs and 2) the clock source and format of the digital data stream (L justified MSB first PCM?) so that I can build a suitable transmitter section for S/PDIF. Thus, the factory datasheet for the part would reeeeealy come in handy right about now.

9th March 2007, 02:04 PM	#1
highly diyAudio Member Join Date: Mar 2007	AK7720a Datasheet (repost) Reposted from Car Audio. Suppose this is a more fitting place. I was wondering if anyone out there would happen to have the datasheet for the AKM AK7720a DSP. Specifically interested in the data type, word length, and clocking method of the SDOUT on (I believe) pin 17. I have searched the net but only found reference to pinouts in a Clarion service manual that I ran across. AKM does not have the datasheet posted online, but I have attempted to contact them for a datasheet. I'm not holding my breath on that one. Thanks!

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Speaker DIY in Wisconsin This is a repost for any who missed my earlier message se	loninappleton	Multi-Way	2	23rd January 2010 06:35 AM
Tiny 6x300W amp(repost)	berni8k	Class D	8	21st August 2009 02:06 PM
AK7720a DSP Datasheet?	highly	Car Audio	2	9th March 2007 02:58 AM
Datasheet help	Stocker	Parts	0	10th March 2004 01:36 PM
Datasheet	Piersma	Digital Source	3	29th January 2003 07:49 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

9th March 2007, 02:14 PM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Here is some more info, in case you would have missed it: http://www.elitecaraudio.com/forums/...6&pagenumber=9 http://www.asahi-kasei.co.jp/akm/en/...a/ak7720a.html /Hugo

9th March 2007, 04:42 PM	#3
highly diyAudio Member Join Date: Mar 2007	Thanks. Thus far using the block diagram from the AK page and a schematic diagram from a service manual for a consumer product that uses this chip I have worked out that there should be a non-switched digital output from the DSP on pin 17. The DSP can either use its internal DACs (as it is in my case) or to use external DACs based on the state of internal switch configuration. According to the block diagram, however, Dout0 is not affected by that internal switch register. From what I can gather, it appears to be a PCM output. My hopes are to use this digital out to run an offboard DSP crossover/DAC over S/PDIF. Before forging ahead I was hoping to get a datasheet that shows 1) that this output should be available even if the primary DSP output path is to the onboard DACs and 2) the clock source and format of the digital data stream (L justified MSB first PCM?) so that I can build a suitable transmitter section for S/PDIF. Thus, the factory datasheet for the part would reeeeealy come in handy right about now.