MC1374 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

MC1374

TV MODULATOR CIRCUIT

Motorola => Freescale 

MC1374

VCC

Figure 19. A Channel 4 Vestigial Sideband Filter

8

9

RL = 75Ω 8.2pF

24Ω

2.7k

39

pF

33pF

33pF

Both transformer windings

4T #23 AWG

close wound on 1/4″ ID

on common axis, 3/8″ spacing.

8.2pF 24Ω

33pF

24Ω

100Ω

Output

75Ω

8T #23 AWG

close wound on 1/8″ ID,

knife tuned to trap Channel 3

61.25 MHz.

0

–10

–20

–30

–40

Ch. 4 Ch. 4

–50

Pix

S

–60

–70

61 65 69 73

f, FREQUENCY (MHz)

Figure 20. Audio Pre–Emphasis Circuit

25

1

2 π RC

20

C = 0.0012µF

CC = 0.1µF

–+

14

“Flat”

Audio

Input

Audio

r = 56kΩ Input

R

6.0kΩ

5 Gnd

15

10

1

5 2 π (r + R)CC

0

1

2 π rC

–5

21

210 2100 21k

f, FREQUENCY (MHz)

Pre–emphasis = 75 µs = rC =

1

2 π (2100 Hz)

Figure 21. Crystal Controlled RF Oscillator

for Channel 3, 61.25 MHz

VCC

R1 470

C1

0.001

R2 470

61.252

MHz

R3 470

C2

56pF

Ra

180

L1

0.15µH

Rb 18

6

7

MC1374

NOTE: See Application Note AN829 for further information.

8

MOTOROLA ANALOG IC DEVICE DATA

Share Link: