1996 Dec 11

8

Philips Semiconductors

Product specification

Picture Signal Improvement (PSI) circuit

with enhanced peaking function

TDA4672

Notes

1.

α

α

2. A number of more than 31 burst key pulses repeats the counter cycle of delay time control.

input voltage threshold for

H and V sync

SC5-bit = 0 (+12 V)

1.1

1.5

1.9

V

input voltage threshold for burst

SC5-bit = 0 (+12 V)

5.5

6.5

7.5

V

input voltage threshold for

H and V sync

SC5-bit = 1 (+5 V)

1.1

1.5

1.9

V

input voltage threshold for burst

SC5-bit = 1 (+5 V)

3.0

3.5

4.0

V

input resistance

+12 V input level

30

40

50

k

Ω

+5 V input level

15

20

25

k

Ω

input capacitance

−

48pF

burst key pulse width

3.0

4.0

4.6

µs

leading edge delay for clamping

pulse

−

1

−µs

number of required burst key

pulses vertical blanking interval

note 2

4

−

31

−

HIGH level input voltage on

pins 9 and 10

3

−

5V

LOW level input voltage on pins 9

and 10

0

−

1.5

V

input current on pins 9 and 10

−−±10

µA

output voltage at acknowledge on

pin 9

−−

0.4

V

output current at acknowledge on

pin 9

sink current

3

−−

mA

SYMBOL

PARAMETER

CONDITIONS

MIN.

TYP.

MAX.

UNIT