Video Front End Features General Description • • • • • • • • The EL4501C Video Front End (VFE) is an integrated solution 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 system. The VFE contains a high bandwidth DC Restore, a sophisticated Sync Separator, and a Data Slicer for embedded data recovery. DC restore and sync separator Wideband (100MHz) DC restore Advanced sync separator Programmable data slicer Single 5 volt operation Differential Gain = 0.1% Differential Phase = 0.1° Low power (<75mW) Applications • • • • • Video Capture & Editing Video Projectors Set Top Boxes Security Video Embedded data recovery EL4501C - Preliminary EL4501C - Preliminary 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 noise immunity by incorporating a signal qualification 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 package that takes only 0.08in2(54mm2) of board area, as well as a standard 24 pin SOIC. 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 Connection Diagram VFB 1 VIDEO_IN 2 23 DS_OUT DS_MODE 3 22 DS_REF DS_ENAB 4 21 REF_IN GND 5 GNDD 6 RFREQ 7 FSEL 8 LOS 10 20 REF_OUT 19 VS 18 VSD 17 SYNC_AMP 16 NC 15 BACK_PORCH COMPOSITE 11 14 ODD/EVEN HORIZONTAL 12 13 VERTICAL September 7, 2000 SYNC_IN 9 © 2000 Elantec Semiconductor, Inc. 24 VIDEO_OUT EL4501C - Preliminary EL4501C - Preliminary Video Front End Absolute Maximum Ratings (T A = 25°C) 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. +6V Supply Voltage (VS to GND) Input Voltage GND - 0.3V, VS +0.3V Storage Temperature Range Ambient Operating Temperature Operating Junction Temperature Power Dissipation -65°C to +150°C -40°C to +85°C 125°C 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: TJ = TC = TA. Electrical Characteristics VS = +5V, GND = 0V, TA = 25°C, Input Video = 1VP-P unless otherwise specified. Parameter IS Description Supply Current Conditions Min Typ No Load, VIN = 0V Max Unit 20 mA Video Amplifier Section VOP VON Positive Output Voltage Swing Negative Output Voltage Swing RL = 150Ω to VS/2 4.70 4.85 V RL = 150Ω to GND 4.20 4.60 V RL = 1k to VS/2 4.95 4.97 RL = 150Ω to VS/2 0.15 RL = 150Ω to GND 0 RL = 1k to VS/2 V 0.30 V 0.03 0.05 V V +IOUT Positive Output Current RL = 10Ω to VS/2 60 80 120 mA -IOUT Negative Output Current RL = 10Ω to VS/2 -50 -60 -80 mA dG Differential Gain Error dP Differential Phase Error BW BW1  Standard NTSC test, AV = 2, RL = 150Ω 0.1 Standard NTSC test, AV = 2, RL = 150Ω 0.1 ° Bandwidth -3dB, G = 1, RL = 10kΩ to GND 100 MHz -3dB, G = 1, RL = 150Ω to GND 60 MHz Bandwidth +/-0.1dB, G = 2, RL = 150Ω to GND 8 MHz 25% to 75%, 3.5VP-P, RL = 150Ω SR Slew Rate VRL Ref Level Range ts Settling Time  RIN Input Resistance (VIDEO_IN) CIN Input Capacitance (VIDEO_IN) AVOL Open Loop Voltage Gain 150 200 0 to 0.1%, VIN = 0V to 3V % V/µs 3.5 35 90 115 V ns 140 kΩ 1.5 pF RL = no load, VOUT = 0.5V to 3V 54 65 dB RL = 150Ω to GND, VOUT = 0.5V to 3V 40 50 dB DC Restore Section CMIR Common Mode Input Range (REF_IN) CMRR ≥ TBD dB VOS Input Offset Voltage DC restored TCVOS Input Offset Voltage Temperature Coefficient IB Input Bias Current (REF_IN) 0 3.5 V -20 +20 mV 10 VCM = 0V to 3.5V 1 µV/°C 100 nA Data Slicer Section IIH Input High Current (DS_MODE & DS_ENAB) VIH = 5V 4 6 µA IIL Input Low Current (DS_MODE & DS_ENAB) VIL = 0V 1 100 nA VIH Input High Voltage (DS_MODE & DS_ENAB) VIL Input Low Voltage (DS_MODE & DS_ENAB) 0.5 V VOH Output High Voltage (DS_OUT) IOUT = -1mA VOL Output Low Voltage (DS_OUT) IOUT = 1mA IOUT Short Circuit Current (DS_OUT) RL = 10Ω to 2.5V 4.5 4.75 V 4.9 0.1 2 15 20 V 0.25 V mA Video Front End Electrical Characteristics VS = +5V, GND = 0V, TA = 25°C, Input Video = 1VP-P unless otherwise specified. Parameter Description IB Input Bias Current (DS_REF) Vos Input Offset Voltage Conditions DS_REF = 0V & 5V Min Typ Max -100 1 100 nA +20 mV mV -20 Unit VHYS Hysteresis 10 15 tPD Propagation Delay 50% to 50% 18 28 ns tR/F Rise/Fall Time 10% to 90%, RL = 150k, CL = 5pF 1.2 1.8 ns Sync Separator Section VOH Output High Voltage IOH = -1.6mA VOL Output Low Voltage IOL = 1.6mA VTHSRH Slicing Level TCD Composite Sync Delay With Filter TBD TCD Composite Sync Delay Without Filter TBD VSR Sync In Reference Level 1.5 V RINSR Sync Reference Input Impedance 90 kΩ VRANGE Input Dynamic Range tCD Comp Sync Delay From 50% point of leading edge of sync 50 75 100 ns tBD Back Porch Delay From 50% point of trailing edge of sync 340 430 520 ns tBW Back Porch Width 2.7 3.0 3.3 µs tHD Horiz Sync Delay From 50% point of leading edge of sync 350 450 550 ns tHW Horiz Sync Width 3.7 4.7 5.7 µs µs 4.6 45 V 50 0.4 V 55 % TBD TBD 0.5 2.0 Vp-p tVW Vert Sync Width Serrations 185 195 205 tVDD Vert Sync Default Delay No serrations 51 63.5 76 µs fH Horiz Scan Rate RFREQ = xx to yy kΩ 15 130 kHz VLOS LOS Detect Threshold Compared to Sync Tip Amplitude tJIT Output Jitter All sync separator outputs 72 mV 5 ns 1.4 V Reference Section VREF Reference Output Voltage (REF_OUT) IOUT = +2mA to -0.5mA 3 1.2 1.3 EL4501C - Preliminary EL4501C - Preliminary EL4501C - Preliminary EL4501C - Preliminary Video Front End Typical Performance Curves 4 Video Front End 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 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 EL4501C - Preliminary EL4501C - Preliminary EL4501C - Preliminary Video Front End Timing Diagrams (cont.) Video In Composite Sync Output tCD tBD Burst/Back Porch Output tBW tHD tHW Horizontal Sync Output Video In Vertical Sync Output tCD+t t<< tCD ODD/EVEN tCD+2t 6 Video Front End Pin Description Pin Number Pin Name Pin Type Pin Description 1 VFB Input Connection for gain and feedback resistors, RF and RG. 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 GNDD Input Digital ground 7 RFREQ 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 VSD Input Digital power supply. Nominally +5V 19 VS 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. 7 EL4501C - Preliminary EL4501C - Preliminary EL4501C - Preliminary EL4501C - Preliminary Video Front End Block Diagram VS VSD DS_REF DS_MODE Input video VIDEO_IN DS_ENAB + + DS_OUT 0.1uF - VIDEO_OUT RF VFB + SYNC_IN 0.1uF RG REF_IN 1.3V REF_OUT + – LOS’ FSEL BACK_PORCH Filter COMPOSITE Sync Separator SYNC_AMP HORIZONTAL LOS VERTICAL RFREQ ODD/EVEN GND GNDD 8 Video Front End Description of Operation The EL4501C incorporates the following functional blocks: also includes a qualification scheme which rejects noise pulses and other video artifacts. The horizontal line rate timing is controlled with the use of a resistor, RFREQ. • DC restore amplifier The following outputs are available: • Advanced sync separator • Composite sync • Data Slicer • Horizontal sync Combined they provide the key analog processing functions for a number of video system applications. The operation of each of these blocks is described below. • Vertical sync • Burst gate Sync Separator • Odd/Even field identification 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 • Loss of signal detected • Sync amplitude detected 9 EL4501C - Preliminary EL4501C - Preliminary EL4501C - Preliminary EL4501C - Preliminary Video Front End General Disclaimer Specifications contained in this data sheet are in effect as of the publication date shown. Elantec, Inc. reserves the right to make changes in the circuitry or specifications contained herein at any time without notice. Elantec, Inc. assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. September 7, 2000 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 intended to support 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 application of Elantec, Inc. Products in Life 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 cover injury to persons or property or other consequential damages. Elantec Semiconductor, Inc. 675 Trade Zone Blvd. Milpitas, CA 95035 Telephone: (408) 945-1323 (888) ELANTEC Fax: (408) 945-9305 European Office: +44-118-977-6080 Japan Technical Center: +81-45-682-5820 10 Printed in U.S.A.