FCFIFRAGA%CIUC2.UC.RCCN.PT@CUNYVM.CUNY.EDU (FRANCISCO AMARAL F FRAGA) (11/16/90)
Does any anyone know how one can get an application note of the new bitstream chip from Philips, the 8350? I read some features in a hifi magazine and they seem interesting. The chip has two one bit DAC's, no digital filter and can interface with filters of 16, 18 and 20 bits, with oversampling rates as high as 8! It is now used in the very expensive Meridiam 603 converter and just yesterday I read a review of the new Deltec PDM1 Mk2 converter which started using this chip too. The reviewer said something about an upgrading kit for old Deltecs, but any one else seems to know about it. He also says that the digital filter is sourced from Yahama. I tried getting the application from Philips, but got no answer. ........................................................ Francisco A. F. Fraga Dept. Physics Univ. Coimbra 3000 Coimbra PORTUGAL tel. 351-39-34668 fax 351-39-29158 FCFIFRAGA@CIUC2.UC.RCCN.PT
daan@cs.vu.nl (11/20/90)
Hi, Asking philips information of the 8350 is not so wise I think. Ask for the 7350 instead!!. To my knowledge the 8350 does not exist. Read in HifiNews&RecordReview about it . I think it's in the November issue. In the October issue there is a picture of a 7350 in the Meridian. Maybe you already know that philips developed an new 1 bit D/A converter instead of using CMOS like the 7321 they used BIMOS technique. It needs 10 Volts and is a bare 1 bit converter, you have to do the upsampling youreself. It is the first according to the designteam at Philips Nat Lab an D/A converter with true 18 bit resolution (S/N = 120 dB (?)). I heard it at an AES meeting at the Philips Nat Lab a couple of month ago. To my knowledge it hasn't left the lab yet . The Name will be TDA 1547 when it comes out. Bye the way the people at philips laughed about the statement by Sony that their NOT 1 bitter would run at 50 Mhz, more is NOT better. The problem: digital 10's Mhz will cause trouble in the analog part of the configuration plus the intergrator at the end of the switched capacitor config. has to have a bandwith greater than the clockfreq and that's not easy !!!!.. There are more differences but I'm not an electronics expert. Daan van Egmond Daan van Egmond e-mail: daan@nat.vu.nl Physics Faculty, Free University Amsterdam, Amsterdam, Holland