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SAA2502 Datasheet(PDF) 10 Page - NXP Semiconductors |
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SAA2502 Datasheet(HTML) 10 Page - NXP Semiconductors |
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10 / 64 page  1997 Nov 17 10 Philips Semiconductors Preliminary specification ISO/MPEG Audio Source Decoder SAA2502 7.2.3.1 XOR mode PHDIF is the XOR function of SIG and REF. The frequency is twice the frequency of SIG and REF. The PHDIF output carries a signal, switching between GND and VDD, with an average value Vavg which is a function of the phase difference between SIG and REF (see left part of Fig.6). The locking range in this mode of operation is maximum for even values of N3 (180 degrees phase difference) but less for odd values of N3. It is minimum for N3 =3 (120 degrees phase difference). 7.2.3.2 Edge triggered mode PHDIF is only influenced by the rising edges of SIG and REF. Consequently its frequency is equal to the SIG and REF frequency. The electrical behaviour of the PHDIF output pin in this mode is special: PHDIF is HIGH from the rising edge of REF to the rising edge of SIG and 3-stated elsewhere if REF is leading and PHDIF is low from rising edge of SIG to rising edge of REF and 3-stated elsewhere if REF is trailing. Therefore PHDIF is NOT 3-stated during a portion tup of each cycle when it acts as a pull-up device or during a portion tdown of each cycle when it acts as a pull-down device (see right part of Fig.6). As a result the locking range is always 360 degrees phase difference. The output behaviour as function of phase difference is non-symmetrical with reference to the vertical axis, but a reversed mode is also available (by setting the control flag PHSRVS). Fig.6 PHDIF output behaviour. handbook, full pagewidth MGE473 REF to SIG phase difference REF to SIG phase difference max min 0o 180o 360o −180o 0o +180o 0 1 5/6 1/6 Vavg VDD 100% 100% 0% tup tdown T t1 t2 T t PHDIF 3-stated XOR mode edge triggered mode |
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