CXD1159AQ Ver la hoja de datos (PDF) - Sony Semiconductor

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Fabricante

CXD1159AQ

Sync Signal Generator for Camera

Sony Semiconductor 

CXD1159AQ

Functions

1. Generation of various sync signals (See the Timing Chart.)

Various sync signals are generated from clocks.

• Clock frequencies

NTSC: 910fH (14.31818MHz)

PAL: 908fH (14.1875MHz)

4fsc (17.734475MHz)

For the system clock

NTSC: 910fH/7

PAL: 908fH/7 or 6

2. PAL PLL for 4fsc

To the master clock of 908fH is matched a phase of 4fsc. The polarity of the phase comparator can be switched

according to the type of external filter (passive or active).

Filter

Passive

Active

PSEL

L

H

Master

(908fH)

Fast

Slow

Fast

Slow

4fsc

Delay

Fast

Delay

Fast

COMP

H

L

L

H

3. SC (Sub-Carrier) generation

Mode

NTSC

NTSC

PAL

INT or EXT

INT

EXT

x

SC

910fH/4

4fsc/4

4fsc/4

INT: Internal mode

(EXT = L)

EXT: External mode

(EXT = H)

In either mode unused counters are stopped. When SC is not required, by setting SCOF to L all SC counters

are stopped and SC is not output.

4. Initialization and Reset

In INT mode the circuit is initialized with the fall of VINT. At that time, H, V and LALT resets are not accepted.

In EXT mode, VINT is not accepted, whereas H, V and LALT resets are accepted.

–5–

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