TI’s PurePath Digital™ - Page 2

sovadk · 20th August 2007, 04:19 PM

That is not bad for an open-loop design. I can imagine that he used large bank of supply decoupling capacitors or a smps to overcome the distortion caused by supply pumping. I remember having read that 0.01% THD in a open-loop full-bridge requires a supply impedance below 5mohm. For a hal-bridge design the impedance has to be even lower.

IVX · 20th August 2007, 04:34 PM

Yeah, they called it "Zero dead time switching", actually about 10nS into 20nS rise/fall edges. However Cirrus used ADC for tracking PSRR. You know, i can't find nothing about noise shaper in the tas5261.pdf..

sovadk · 21st August 2007, 01:40 PM

It says in the TAS5261 datasheet "t(low) Minimum low-state pulse duration per PWM frame, noise shaper enabled 50 ns". In other words is has a build in noise shaper which is active as long as the pulse width is above 50ns.

IVX · 21st August 2007, 05:05 PM

Sovadk, ok, but THD performance of the TAS5261, rather the same, not better vs old chips at least. It's strange..

20th August 2007, 04:34 PM	#12
IVX diyAudio Member Join Date: Jul 2003 Location: Everywhere (Buddhist's context)	Yeah, they called it "Zero dead time switching", actually about 10nS into 20nS rise/fall edges. However Cirrus used ADC for tracking PSRR. You know, i can't find nothing about noise shaper in the tas5261.pdf.. __________________ Best regards, E1.

21st August 2007, 05:05 PM	#14
IVX diyAudio Member Join Date: Jul 2003 Location: Everywhere (Buddhist's context)	Sovadk, ok, but THD performance of the TAS5261, rather the same, not better vs old chips at least. It's strange.. __________________ Best regards, E1.

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
FS: TI TAS5261 PurePath Power Stage - 75pcs	theAnonymous1	Swap Meet	5	23rd October 2009 06:01 AM
Getting PurePath Studio GDE	DoctorC	Digital Source	3	26th August 2009 08:10 PM
Where to get PurePath Studio	berni8k	Digital Line Level	16	25th August 2009 03:37 PM
Progress report - digital crossover as a DAC - digital all the way to the amps	Ken L	Multi-Way	0	26th November 2006 11:42 PM
TI Purepath	percy	Digital Source	0	14th March 2006 03:46 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

20th August 2007, 04:19 PM	#11
sovadk diyAudio Member Join Date: Sep 2004 Location: Kaspar Sinding Meyer @ DTU in Lyngby	That is not bad for an open-loop design. I can imagine that he used large bank of supply decoupling capacitors or a smps to overcome the distortion caused by supply pumping. I remember having read that 0.01% THD in a open-loop full-bridge requires a supply impedance below 5mohm. For a hal-bridge design the impedance has to be even lower.

21st August 2007, 01:40 PM	#13
sovadk diyAudio Member Join Date: Sep 2004 Location: Kaspar Sinding Meyer @ DTU in Lyngby	It says in the TAS5261 datasheet "t(low) Minimum low-state pulse duration per PWM frame, noise shaper enabled 50 ns". In other words is has a build in noise shaper which is active as long as the pulse width is above 50ns.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)