MC13001XP 查看數據表（PDF） - Motorola => Freescale

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MC13001XP

MONOMAX BLACK AND WHITE TV SUBSYSTEM

Motorola => Freescale 

MC13001X MC13007X

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.

Figure 10. Vertical Waveforms

7.0 V

23

6.0 V

1.0 V pp

–2.5 V 20

2.0 V

22

500 mV pp

0V

21

–4.0 V

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.

Figure 11. Power Supply Circuit

RBL =

VBL – 8

4 x 10–3

+ VBL

Horizontal

Startup Bleed

Main

12 V Supply

RBL

R6

18

IEXT

19

8.2 V to

External

Circuits

8.2 V to

Horizontal

System

R1

Q6

D1

D2

Q1

Z1

Q7

Q3

Q5

R2

Q2

R3

Q4

R5

R4

8.2V to

All Monomax

Circuits Except

Horizontal

IEXT (mA) R6 (Ω)

< 5.0

150

20

82

35

68

MOTOROLA ANALOG IC DEVICE DATA

7

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