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MC13007X bảng dữ liệu(PDF) 7 Page - Motorola, Inc |
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MC13007X bảng dữ liệu(HTML) 7 Page - Motorola, Inc |
7 / 10 page MC13001X MC13007X 7 MOTOROLA ANALOG IC DEVICE DATA The period during which sync can reset the counter and cause flyback is determined by the window control which defines a count range during which the gate is open. One of two ranges is selected according to the condition of the signal. The normal “narrow” range is 514 to 526 counts for a 525 line system and is selected after the coincidence detector indicates that the reset is coincident, twice in succession, with the 525 count from the counter. When the detector indicates non–coincidence 8 times in succession, then the window control switches to the “wide” mode (384 to 544 counts) to achieve rapid re–synchronization. For the 625 line version the counts are 614 to 626 for narrow mode and 484 to 644 for wide mode. Note that the OR gate after the sync gate is used to terminate the count at the end of the respective window if a sync pulse has not appeared. This method accepts nonstandard signals almost in the same way as a conventional triggered RC oscillator and has a similar fast lock–in time. However, the use of a window control on the counter reset ensures that when locked with a normal standard broadcast signal the counter will reject most spurious noise pulse. The blanking output is provided from a latch which is set by the counter reset pulse and terminated by count 20 from the counter chain. 7.0 V 6.0 V –2.5 V 2.0 V 0 V –4.0 V 500 mV pp 1.0 V pp 23 20 22 21 Figure 10. Vertical Waveforms Power Supply The power supply regulator, although of simple design, provides two independent power supplies – one for the horizontal PLL section and the other for the remainder of the chip. The supplies share the same reference voltage but the design of the main regulator is such that it can be switched on independently to give minimum loading on the “bleed” voltage source during startup phase of a defection–derived supply system. + VBL RBL = VBL – 8 4 x 10–3 Horizontal Startup Bleed Main 12 V Supply IEXT 8.2 V to External Circuits R6 RBL 18 19 8.2V to All Monomax Circuits Except Horizontal 8.2 V to Horizontal System R1 Q6 D1 Z1 Q7 Q1 Q4 R5 R4 Q2 R3 Q3 R2 Q5 D2 Figure 11. Power Supply Circuit IEXT (mA) < 5.0 R6 (Ω) 150 20 82 35 68 |
Số phần tương tự - MC13007X |
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Mô tả tương tự - MC13007X |
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