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PCM78P датащи(PDF) 13 Page - Burr-Brown (TI) |
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PCM78P датащи(HTML) 13 Page - Burr-Brown (TI) |
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13 / 16 page ![]() ® PCM78 13 FIGURE 9. Timing when using S OUT2 Latch. OUT 2 S Clock T 2 Ext Clock Status OUT 2 S Latch OUT 2 S Data OUT 1 S Data T 3 T 4 MSB MSB MSB LSB LSB Data (n – 1) T 1 MSB Data Sample n Data (n + 1) Data n TA = +25°C, VCC = +5V, guaranteed by sample testing; these parameters are not 100% tested in production. TIME (ns) TIME DESCRIPTION MIN TYP MAX T1 SOUT2 Latch pulse width 50 100 T2 SOUT2 Clock Cycle 24 T3 Delay from rising edge of CLOCK OUT to bit data valid 10 30 T4 Delay from rising edge of SOUT2 Clock to rising edge of Ext Clock 50 125 FIGURE 10. Application Example of S OUT 2 Operation. ) ( fS 128 2 Ext Clock ) ( fS 128 3 B 1 Word WDCK (S Latch) (2f ) S OUT 2 Word A's Serial Data Serial Out 2 MSB LSB MSB LSB Word A’s Serial Data Serial Out 1 MSB LSB MSB LSB Word A’s Serial Data S Clock OUT 2 JUMPER 1 234 5 15 X X X X 0 14 0 000 X 13 X 000 X 12 0 X 0 0 X 11 X X 0 0 X 10 0 0 X 0 X 9X 0 X 0 X 80 X X 0 X X: Off 0: On NO OF BITS +5V Clock Out Convert Command PCM78P LS20 12 A CL A CL 1 2 13 LS393 Q Q Q Q Q 3 4 5 6 11 A B C D E 1 2 3 4 5 +5V 10k Ω x 4 Jumper LS20 Short Cycle 18 (PCM78) 10 19 FIGURE 11 . Short Cycle Circuit. CC Clock Short Cycle Status 1234 11 12 13 11 12 13 123 Conversion Time FIGURE 12. Short Cycle Operation Timing. |
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