MC44140DW Ver la hoja de datos (PDF) - Motorola => Freescale

Número de pieza

componentes Descripción

Fabricante

MC44140DW

Chroma Delay Line HCMOS

Motorola => Freescale 

PIN DESCRIPTIONS

Pin

Symbol

2

VDD

3

VSS

1

CK

5

SS

4

SC

15

IN1A

14

IN2A

6

IN1B

11

IN2B

8

EXT1

9

EXT2

7

OUT1

10

OUT2

16

BIAS

Function

Positive supply voltage.

Supply ground.

System clock. Supplied from MC440XX master clock. Either 17.734475 MHz (PAL and SECAM) or

14.31818 MHz (NTSC) sine wave.

System selection. 4–level signal supplied by MC440XX to indicate whether color difference signals

are PAL, NTSC, SECAM, or EXTERNAL.

Sandcastle pulse. Periodic multi–level signal supplied by MC440XX. The pulse has 4 levels to

indicate the timing of black level, ident. gate, and active signal, together with a level changing every

other line. Used to control the clamps and for the timing of the SECAM switching.

R–Y (IN1) and B–Y (IN2) inputs to the A/D converters. Baseband color difference (0 to 1.2 MHz)

signals supplied by MC440XX via external coupling capacitors of a value greater than 560 nF; these

may originate from PAL, NTSC, or SECAM systems.

From same source as the “A” inputs but using separate 100 nf coupling capacitors to the direct

(un–delayed) inputs.

External R–Y (EXT1) and B–Y (EXT2) inputs. These are baseband color difference signals which

are ac coupled via 10 nF capacitors from an external source.

R–Y (OUT1) and B–Y (OUT2) outputs. The “corrected” baseband color difference signals are

returned to MC440XX via external 10 nF capacitors.

Bias current. A bias current is fed to this pin by means of an external pull–up resistor of 68 kΩ, in

order to set the dc operating point of the operational amplifiers. An external decoupling capacitor to

GND of 10 nF is required.

MOTOROLA

MC44140

2–3

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