14

Video ICs

BA7207AS / BA7207AK

Fig. 7

∗

∗

∗

∗

∗

33

32

31

29

30

28

27

25

24

23

22

21

20

18

16

13

12

15

17

19

34

35

36

38

40

42

43

44

41

39

37

26

1

2

3

5

4

6

10

11

BA7207AK (QFP44)

PAL

0.1

µ

0.01

µ

0.01

µ

0.1

µ

0.01

µ

100

µ

47

µ

0.01

µ

0.01

µ

0.1

µ

LPF

100p

∆

∆

∆

0.47

µ

0.01

µ

0.01

µ

12

µ

580p

0.1

µ

1k

VR3

VR2

100k

33k

10k

4700p

0.01

µ

SCM

Vreg

× 2

× 2

÷ 4

LIM

LIM

P

P

P

R

P

P

R

R

P

R

R

EQ

DET

VCO

SCM PAL

BELL

FREQUENCY

ADJUSTER

SYNC GATE

TIMING

GENERATOR

1.1MHz

BPF

2.2MHz

BPF

4.3MHz

BPF—A

4.3MHz

BPF—B

PB

SYNC GATE

REC

SYNC GATE

R

MODE

CONTROL

2k

7.5k

VR

VR1

2k

7.5k

VR

100p

47

µ

27p

PAL REC C.

REC C OUT.

SCM/PAL

REC/PB

PBIN

B/W

SYNC IN

PALPB C.

PB C OUT

RECIN

∆

+

+

To cancel the temperature characteristic of the ID, the resistors marked with asterisks should be of the metal film, and have a

temperature coefficient

± 100ppm / °C.

The 100pF capacitor connected to pin 16 is intended to reduce temperature disper of the gate phase.It should have a static

capacitance tolerance of

± 10% or Ic and a temperature coefficient of ± 30ppm / °C ( – 55°C to + 125°C) A (CG).

∗

14

7

9

8

Pin

Low

High (Open)

REC / PB setting switch

Output select switch

Chroma killer switch

RECH (19pin / 21pin)

PB

REC

CTL (21pin / 23pin)

PAL

SECAM

BWL (17pin / 18pin)

(BA7207AS / BA7207AK)

Chroma killer

NORMAL