Datasheet EL4501CU, EL4501CS Datasheet (ELANT)

EL4501C - Preliminary

Vi deo Front End

EL4501C - Preliminary

Features

• DC restore and sync s e parator

• Wideband (100MHz) DC restore

• Advanced sync separator

• Programmable data slicer

• Single 5 volt operation

• Differential Gain = 0.1%

• Differential Phase = 0.1°

• Low power (<75 mW)

Applications

• Video Capture & Editing

• Video Projectors

• Set Top Boxes

• Security Video

• Embedded data recovery

Ordering Information

Part No. Temp. Range Package Outline #

EL4501CS -40°C to +85°C 24-Pin SOIC MDP0027 EL4501CU -40°C to +85°C 24-Pin QSOP MDP0031

General Description

The EL4501C Video Front End (VFE) is an in tegrated soluti on that
provides the key analog signal conditioning functions for analog video
signals. It forms the front end interface for either an analog or ana­log/digital video syst em. The VFE contain s a high bandwidth DC
Restore, a sophistica ted Sync Se para tor, and a Data Sl icer for e mbed­ded data recovery.

The VFE will perform the restoration of the DC reference level
(blanking level) and the extraction of all of the necessary timing sig­nals needed for synchronization and control. The sync separator is
designed for very good nois e im mun ity by incor pora ting a sign al q ual­ification scheme and internal brick wall filter. A data slicer is also
included to help decode data embedded in the active video or VBI
areas of the signal.

The VFE operates from a single 5 volt supply and is available in a
small 24 pin QSOP pac kag e tha t ta kes on ly 0.0 8in

2

(54mm

2

) of board

area, as well as a standard 24 pin SOIC.

Connection Diagram

1

VIDEO_OUTVFB

24

© 2000 Elantec Semiconductor, Inc.

VIDEO_IN

DS_MODE

DS_ENAB

GND

GNDD

RFREQ

FSEL

SYNC_IN

LOS

COMPOSITE

HORIZONTAL

2

3

4

5

6

7

8

9

10

11

12

DS_OUT

23

DS_REF

22

REF_IN

21

REF_OUT

20

VS

19

VSD

18

SYNC_AMP

17

NC

16

BACK_PORCH

15

ODD/EVEN

14

VERTICAL

13

September 7, 2000

EL4501C - Preliminary

Video Front End

Absolute Maximum Ratings (T

Values beyond absolute maximum ratings can cause the device to be pre­maturely damaged. Absolute maximum ratings are stress ratings only and
functional device operation is not implied.

Supply Voltage (V

EL4501C - Preliminary

Input Voltage GND - 0.3V, V

to GND) +6V

S

= 25°C)

A

+0.3V

S

Storage Temperature Range -65°C to +150°C
Ambient Operating Temperature -40°C to +85°C
Operating Junction Temperature 125°C
Power Dissipation See Curves

Important Note:
All parameters having Min/Max specifications are guaranteed. Typ values are for information purposes only. Unless otherwise noted, all tests are at the

specified temperature and are pulsed tests, therefore: T

= TC = TA.

J

Electrical Characteristics

VS = +5V, GND = 0V, TA = 25°C, Input Video = 1V

Parameter Description Conditions Min Typ Max Unit

I

S

Supply Current No Load, V

Video Amplifier Section

V

OP

V

ON

+I

OUT

-I

OUT

dG Differential Gain Error
dP Differential Phase Error

Positive Output V oltage Swing RL = 150Ω to V

Negative Output V oltage Swing RL = 150Ω to V

Positive Output Current RL = 10Ω to V
Negative Output Current RL = 10Ω to V

[1]

[1]

BW Bandwidth -3dB, G = 1, R

BW1 Bandwidth +/-0.1dB, G = 2, R
SR Slew Rate 25% to 75%, 3.5V
V

RL

Ref Level Range 03.5V
ts Settling Time to 0.1%, V
R

IN

C

IN

A

VOL

Input Resistance (VIDEO_IN) 90 115 140 kΩ

Input Capacitance (VIDEO_IN) 1.5 pF

Open Loop Voltage Gain RL = no load, V

DC Restore Section

CMIR Common Mode Input Range (REF_IN) CMRR ≥ TBD dB 0 3.5 V
V

OS

TCV
I

B

Input Offset Voltage DC restored -20 +20 mV

Input Offset Voltage Temperature Coefficient 10 µV/°C

OS

Input Bias Current (REF_IN) VCM = 0V to 3.5V 1 100 nA

Data Slicer Section

I
I
V
V
V
V
I

IH
IL

IH
IL
OH
OL

OUT

Input High Current (DS_MODE & DS_ENAB) VIH = 5V 4 6 µA

Input Low Current (DS_MODE & DS_ENAB) VIL = 0V 1 100 nA

Input High Voltage (DS_MODE & DS_ENAB) 4.5 V

Input Low Voltage (DS_MODE & DS_ENAB) 0.5 V

Output High V oltage (DS_OUT) I

Output Low Voltage (DS_OUT) I

Short Circuit Current (DS_OUT) RL = 10Ω to 2.5V 15 20 mA

unless otherwise specified.

P-P

R

= 150Ω to GND 4.20 4.60 V

L

R

= 1k to V

L

R

= 150Ω to GND 0 V

L

R

= 1k to V

L

Standard NTSC test, AV = 2, RL = 150Ω 0.1 %
Standard NTSC test, AV = 2, RL = 150Ω 0.1 °

-3dB, G = 1, R

R

= 150Ω to GND, V

L

= -1mA 4.75 4.9 V

OUT

= 1mA 0.1 0.25 V

OUT

= 0V 20 mA

IN

S

/2

S

/2

S

/2

S

/2

S

/2

S

/2

L = 10kΩ to GND 100 MHz
L = 150Ω to GND 60 MHz

L = 150Ω to GND 8 MHz

, RL = 150Ω 150 200 V/µs

P-P

= 0V to 3V 35 ns

IN

= 0.5V to 3V 54 65 dB

OUT

= 0.5V to 3V 40 50 dB

OUT

4.70 4.85 V

4.95 4.97 V

0.15 0.30 V

0.03 0.05 V

60 80 120 mA

-50 -60 -80 mA

2

EL4501C - Preliminary

Video Front End

Electrical Characteristics

VS = +5V, GND = 0V, TA = 25°C, Input Video = 1V

Parameter Description Conditions Min Typ Max Unit

I

B

Input Bias Current (DS_REF) DS_REF = 0V & 5V -100 1 100 nA Vos Input Offset Voltage -20 +20 mV V

HYS

t

PD

t

R/F

Hysteresis 10 15 mV

Propagation Delay 50% to 50% 18 28 ns

Rise/Fall Time 10% to 90%, RL = 150k, CL = 5pF 1.2 1.8 ns

Sync Separator Section

V

OH

V

OL

V

THSRH

T

CD

T

CD

V

SR

R

INSR

V

RANGE

t

CD

t

BD

t

BW

t

HD

t

HW

t

VW

t

VDD

f

H

V

LOS

t

JIT

Output High V oltage I

Output Low V oltage I

Slicing Level 45 50 55 %

Composite Sync Delay With Filter TBD TBD

Composite Sync Delay Without Filter TBD TBD

Sync In Reference Level 1.5 V

Sync Reference Input Impedance 90 kΩ

Input Dynamic Range 0.5 2.0 Vp-p

Comp Sync Delay From 50% point of leading edge of sync 50 75 100 ns

Back Porch Delay From 50% point of trailing edge of sync 34 0 430 520 ns

Back Porch Width 2.7 3.0 3.3 µs

Horiz Sync Delay From 50% point of leading edge of sync 350 450 550 ns

Horiz Sync Width 3.7 4.7 5.7 µs

V ert Sync Width Serrations 185 195 205 µs

Vert Sync Default Delay No serrations 51 63.5 76 µs

Horiz Scan Rate R

LOS Detect Threshold Compared to Sync Tip Amplitude 72 mV

Output Jitter All sync separator outputs 5 ns

Reference Section

VREF Reference Output Voltage (REF_OUT) I

unless otherwise specified.

P-P

= -1.6mA 4.6 V

OH

= 1.6mA 0.4 V

OL

= xx to yy kΩ 15 130 kHz

FREQ

= +2mA to -0.5mA 1.2 1.3 1.4 V

OUT

EL4501C - Preliminary

3

EL4501C - Preliminary

Video Front End

Typical Performance Curves

EL4501C - Preliminary

4

Timing Diagrams

Fields One and Three (ODD)

Composite Signal

Composite Sync Output

Burst/Back Porch Output

Horizontal Sync Output

Vertical Sync Output

Odd/Even Output

EL4501C - Preliminary

EL4501C - Preliminary

Video Front End

Fields Two and Four (EVEN)

Composite Signal

Composite Sync Output

Burst/Back Porch Output

Horizontal Sync Output

Vertical Sync Output

Odd/Even Output

5

EL4501C - Preliminary

Video Front End

Timing Diagrams (cont.)

EL4501C - Preliminary

Video In

Composite Sync Output

Burst/Back Porch Output

Horizontal Sync Output

Video In

Vertical Sync Output

ODD/EVEN

t

CD

t

HD

t<< t

CD

t

HW

tCD+2t

tCD+t

t

BD

t

BW

6

EL4501C - Preliminary

Video Front End

Pin Description

Pin

Number Pin Name Pin Type Pin Description

1 VFB Input Connection for gain and feedback resistors, R
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

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 GND
7R
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 V
19 V
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

24 VIDEO_OUT Output Output of DC restore amplifier.

D

FREQ

SD
S

Input Digital ground
Input Connection for bias resistor that sets the overall timing.

Input Digital power supply. Nominally +5V
Input Analog power supply. Nominally +5V.

drain/collector.

depending on the DS_MODE pin.

and RG.

F

EL4501C - Preliminary

7

EL4501C - Preliminary

Video Front End

Block Diagram

EL4501C - Preliminary

Input video

VIDEO_IN

0.1uF

SYNC_IN

0.1uF

SYNC_AMP

V

S

LOS

R

FREQ

V

SD

+

-

LOS’

FilterFSEL

Sync Separator

GND

DS_REF

GND

D

DS_MODE

+

1.3V

DS_ENAB
DS_OUT

VIDEO_OUT

R

VFB

R

REF_IN
REF_OUT

BACK_PORCH

COMPOSITE
HORIZONTAL
VERTICAL
ODD/EVEN

F

G

+

-

+

-

–

8

Description of Operation

The EL4501C incorporates the following functional
blocks:

• DC restore amplifier

• Advanced sync separator

• Data Slicer

Combined they pr ovid e t he key ana l og pr oc essing fun c­tions for a number of video system applications. The
operation of each of these blocks is described below.

Sync Separa t or

The sync separator contained in the EL4501C has been
designed to be compatible with a wide range of video
signal standards, operating with horizontal line rates
from PAL/NTSC rates up to 150kHz. The sync separator

EL4501C - Preliminary

Video Front End

also includes a qualification scheme which rejects noise
pulses and other video arti facts. The h orizontal l ine rate
timing is controlled with the use of a resistor, R

The following outputs are available:

• Composite sync

• Horizontal sync

• Vertical sync

• Burst gate

• Odd/Even field identification

• Loss of signal detected

• Sync amplitude detected

FREQ

.

EL4501C - Preliminary

9

EL4501C - Preliminary

Video Front End

EL4501C - Preliminary

General Disclaimer

Specifications contained in this data sheet are in effect as of the publicat ion date shown. Elantec, Inc. re serves the r ight to make changes in th e cir­cuitry or specifications cont ained herein at a ny time without notice. Elantec , Inc. assumes no res ponsibili ty for t he us e of an y circuits descr ibed
herein and makes no representations that they are free from patent infringement.

WARNING - Life Support Policy

Elantec, Inc. products are not authorized for and should not be used
within Life Support Systems without the specific written consent of
Elantec, Inc. Life Support systems are equipment intend ed to sup-

Elantec Semiconductor, Inc.

675 Trade Zone Blvd.
Milpitas, CA 95035
Telephone: [phone]

(888) ELANTEC
Fax: [phone]
European Office: [phone]
Japan Technical Center: [phone]

port or sustain life and whose failure to perform when properly used
in accordance with instructions provided can be reasonably
expected to result in significant personal injury or death. Users con­templating applicatio n of Elantec, Inc. P roducts in Li fe Support
Systems are requested to contact Elantec, Inc. factory headquarters
to establish suitable terms & conditions for these applications. Elan­tec, Inc. ’s warranty is limited to replacement of defective
components and does not cov er injury to persons or prop erty or
other consequential damages.

September 7, 2000

10

Printed in U.S.A.