TDA2579B/N2 Просмотр технического описания (PDF) - Philips Electronics

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производитель

TDA2579B/N2

Horizontal/vertical synchronization circuit

Philips Electronics 

Philips Semiconductors

Horizontal/vertical synchronization circuit

Preliminary specification

TDA2579B

PARAMETER

CONDITIONS

Temperature coefficient

horizontal output pulse

Influence of delay time on pulse

width of the horizontal output

signal

Sandcastle output signal (pin 17)

IL = 1 mA

Output voltage during:

burst-key

horizontal blanking

vertical blanking

Zero level output voltage

Pulse width:

burst-key (50 Hz)

burst-key (60 Hz)

Horizontal blanking

Vertical blanking

Phase position burstkey

time between middle sync

pulse at pin 5 and start of

burst pulse at pin 17

Time between start sync pulse

and end of burst pulse at pin 17

(50 Hz)

(60 Hz)

IL = 0.3 mA

Isink = 0.5 mA

note 5

Coincidence detector, video transmitter

identification circuit and time constant

switching levels (see also Fig.1)

Detector output current

Voltage level for in sync

condition (ϕ1 normal)

Voltage for noisy sync pulse

(ϕ1 slow and gated)

Voltage level for noise only

Switching level normal to fast

Switching level

mute output active and

fast to normal

Switching level frame period

counter (3 periods fast)

note 6

SYMBOL MIN.

−

∆HW/td −

V17

9.8

V17

4.1

V17

2.1

V17

−

tp

3.85

tp

3.40

V12

−

2.3

−

−

I18

−

V18

5.8

V18

9

V18

−

V18

< 3.2

V18

< 1.0

V18

< 0.08

TYP.

−5.10-2

0.16

10.4

4.5

2.5

−

4.15

3.65

1.0

2.7

9.3

8.8

0.25

6.5

10

0.3

3.5

1.2

0.12

MAX. UNIT

−

µs/°C

−

µs/µs

−

V

4.9

V

2.9

V

0.7

V

4.6

µs

4.0

µs

−

V

3.1

µs

9.7

µs

9.2

µs

−

mA

7.0

V

−

V

−

V

3.8

V

1.4

V

0.16

V

September 1990

14

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