EL4581C

Sync Separator 50% Slice S-H Filter

Dynamic Characteristics

Parameter

Description

Temp

Min

Typ

Max

Test

Units

Level

(Note 3)

25 C

190

230

300

I

ms

(Note 3)

25 C

25

35

45

I

ms

25 C40

55

70

I

ms

Filter Attenuation

25 C24

V

dB

Composite Sync Prop Delay

25 C

260

400

I

ns

(Note 3)

Input Dynamic Range

p-p NTSC Signal

25 C

05

2

I

V

(Note 5)

Slice Level

25 C

40%

50%

60%

I

(Note 6)

Full

40%

50%

60%

IV

Note 4 Attenuation is a function of Rset (PIN6)

Note 6 Refers to threshold level of sync tip to back porch amplitude

Pin Descriptions

Pin No

Pin Name

Function

1

Composite Sync Out

Composite sync pulse output Sync pulses start on a falling edge and end on a rising edge

2

Composite Video in

AC coupled composite video input Sync tip must be at the lowest potential (Positive

picture phase)

3

Vertical Sync Out

Vertical sync pulse output The falling edge of Vert Sync is the start of the vertical period

4

GND

Supply ground

5

BurstBack Porch Output

BurstBack porch output Low during burst portion of composite video

An external resistor to ground sets all internal timing 681k 1% resistor will provide correct

timing for NTSC signals

7

OddEven Output

OddEven field output Low during odd fields high during even fields Transitions occur at

start of Vert Sync pulse

Positive supply (5V)

3