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Hi, studiing the ADSP-21161N Preliminary Data Sheet (from July 2000, there is no newer version, is'nt it?) I found the following: Table 37 at page 73/74 shows for PBGA Pin# P14 a pin named "AVSS". Well, that pin is'nt shown at table 13-1, pages 543-561 of the "ADSP-21161N SHARC DSP Hardware Reference" sheet. Instead there a pin named "AGND" can be found, but that pin is not shown in Table 37 of the "ADSP-21161N Preliminary Data Sheet" Well, I want to build a library file for our pcb layout program, and now my question is: are "AVSS" and "AGND" the same pins/signals? Thanks, Karsten -- Ein Programm, dessen Implementierung ich nicht verstehe, kann ich weder erweitern, noch ist dessen Wiederverwendung zuverlaessig. |
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ADSP21161N datasheet question
Started by ●July 31, 2001
Reply by ●August 1, 20012001-08-01
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Hallo Karsten Yes, I think it is pretty safe to assume that this is the same pin. VSS is often used to refer to the source voltage as opposed to the drain voltage (usually VDD). The pins on the FPGA package and the pin table seem consistent too. The AGND pin can be tied to the digital ground plane (it is the return for the current used in the analog PLL circuitry). The analog VCC should be filtered according to the data sheet. Cheers, Clifford Karsten Backhaus wrote: > Hi, > > studiing the ADSP-21161N Preliminary Data Sheet (from July 2000, there > is no newer version, is'nt it?) I found the following: > > Table 37 at page 73/74 shows for PBGA Pin# P14 a pin named "AVSS". Well, > that pin is'nt shown at table 13-1, pages 543-561 of the "ADSP-21161N > SHARC DSP Hardware Reference" sheet. Instead there a pin named "AGND" > can be found, but that pin is not shown in Table 37 of the "ADSP-21161N > Preliminary Data Sheet" > > Well, I want to build a library file for our pcb layout program, and now > my question is: > are "AVSS" and "AGND" the same pins/signals? > > Thanks, > > Karsten > > -- > Ein Programm, dessen Implementierung ich nicht verstehe, kann ich > weder erweitern, noch ist dessen Wiederverwendung zuverlaessig. > > _____________________________________ > Note: If you do a simple "reply" with your email client, only the author of this message will receive your answer. You need to do a "reply all" if you want your answer to be distributed to the entire group. > > _____________________________________ > About this discussion group: > > To Join: Send an email to > > To Post: Send an email to > > To Leave: Send an email to > > Archives: http://groups.yahoo.com/group/adsp > > Other Groups: http://www.dsprelated.com/groups.php3 > ">http://docs.yahoo.com/info/terms/ | |||||||
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Reply by ●August 2, 20012001-08-02
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On Tue, 31 Jul 2001 18:12:53 +0200, Karsten Backhaus wrote: > are "AVSS" and "AGND" the same pins/signals? Sounds like someone changed the name along the way. VCC (collector voltage) and GND are commonly used in TTL chips with bipolar transistors, while VDD and VSS (drain and source voltage) are used in MOS chips with FET's. The purpose is the same; the names change to reflect the kind of transistor in use. |
