7

EL4501C - Preliminary

Video Front End

Pin Description

Pin

Number

Pin Name

Pin Type

Pin Description

1

VFB

Input

2

VIDEO_IN

Input

Input to DC restore amplifier. Input coupling capacitor connects from here to video source.

3

DS_MODE

Input

Sets the mode of the DS comparator. Logic high selects a standard logic output. Logic low selects an open

drain/collector.

4

DS_ENAB

Input

Enables the output of the comparator. A logic high enables the comparator. A logic low tri-states it.

5

GND

Input

Analog ground.

6

Input

Digital ground

Input

Connection for bias resistor that sets the overall timing.

8

FSEL

Input

Enable/ bypass internal brick wall filter. A logic high is used to enable the filter, a logic low to disable it.

9

SYNC_IN

Input

Input to the sync separator. Connects to the video source via a coupling capacitor, or to a color burst input filter.

10

LOS

Output

Loss of signal output. Goes high if no input video signal is detected.

11

COMPOSITE

Output

Composite sync output.

12

HORIZONTAL

Output

Horizontal sync output.

13

VERTICAL

Output

Vertical sync output.

14

ODD/EVEN

Output

Odd/Even field indicator output.

15

BACK_PORCH

Output

Back porch output.

17

SYNC_AMP

Output

Amplitude of sync tip. Can be used to control AGC circuit.

18

Input

Digital power supply. Nominally +5V

19

Input

Analog power supply. Nominally +5V.

20

REF-OUT

Output

Voltage reference for use as blanking level in low cost system

21

REF_IN

Input

Dc voltage on this pin sets the DC restore voltage and output blanking level.

22

DS_REF

Input

Sets the slicing level or reference level for the comparator.

23

DS_OUT

Output

Output of the data slicing comparator. The output is either open drain/collector or standard symmetrical logic

depending on the DS_MODE pin.

24

VIDEO_OUT

Output

Output of DC restore amplifier.