6

Multimedia ICs

BA7232FS

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

GND

GND

FILTER

BFP

BFP

BFP

MATRIX

SYNC

CLAMP

CLAMP

CLAMP

0.1

µ

560

4.7k

Color subcarrier

Burst flag pulse

(BFP)

Composite synch

0.1

µ

0.1

µ

0.1

µ

75

220

µ

+

Color TV

signal output

Composite synch output

Analog B signal

Analog G signal

Analog R signal

75

Ω

75

Ω

75

Ω

75

Ω

75

Ω

75

Ω

SSOP - A20

11

10

20

1

8.7

± 0.2

0.36

± 0.1

0.8

0.3Min.

0.15

(1) Input impedance at the input terminals should be as

low as possible as the analog RGB signal is clamped

there.

(2) The color subcarrier should have a duty of 50%.

Duty fluctuation will affect chroma phase. Resistance-

splitting input is used in the "Application example" to

(3) Composite synch and burst flag pulse inputs should

conform to their respective standards, as improper tim-

ing between them can prevent the TV from displaying

color images. For input, use the TTL level and an

impedance of 8k

Ω.