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EL4089C
EL4089C
DC Restored Video Amplifier
Features
Complete video level restoration system 0 02% differential gain and 0 05 differential phase accuracy at NTSC 60 MHz bandwidth 0 1 dB flatness to 10 MHz VS e g5V to g15V TTL CMOS hold signal
General Description
The EL4089C is an 8-pin complete DC-restored monolithic video amplifier sub-system It contains a high quality video amplifier and a nulling sample-and-hold amplifier specifically designed to stabilize video performance When the HOLD logic input is set to a TTL CMOS logic 0 the sample- and-hold amplifier can be used to null the DC offset of the video amplifer When the HOLD input goes to a TTL CMOS logic l the correcting voltage is stored on the video amplifier's input coupling capacitor The correction voltage can be further corrected as need be on each video line The video amplifier is optimized for video performance and low power Its current feedback design allows the user to maintain essentially the same bandwidth over a gain range of nearly 10 1 The amplifier drives back-terminated 75X lines The EL4089C is fabricated in Elantec's proprietary Complementary Bipolar process which produces NPN and PNP transistors with equivalent AC and DC performance The EL4089C is specified for operation over 0 C to a 75 C temperature range
Applications
Input amplifier in video equipment Restoration amplifier in video mixers
Ordering Information
Part No Temp Range Package Outline EL4089CN 0 C to a 75 C EL4089CS 0 C to a 75 C 8-Pin P-DIP MDP0031 8-Lead SO MDP0027
Connection Diagram
January 1996 Rev B
4089 - 1
DC restoring amplifier with a gain of 2 restoring to ground
Note All information contained in this data sheet has been carefully checked and is believed to be accurate as of the date of publication however this data sheet cannot be a ``controlled document'' Current revisions if any to these specifications are maintained at the factory and are available upon your request We recommend checking the revision level before finalization of your design documentation
1993 Elantec Inc
EL4089C
DC Restored Video Amplifier
Absolute Maximum Ratings (TA e 25 C)
Voltage between V a and Vb Voltage between VIN a S HIN a and GND pins VOUT Current Current into VINb and HOLD Pins Internal Power Dissipation 33V (V a ) a 0 5V to (Vb) b0 5V 60 mA 5 mA See Curves Operating Ambient Temperature Range Operating Junction Temperature Plastic DIP or SOL Storage Temperature Range 0 C to a 75 C 150 C
b 65 C to a 150 C
Important Note All parameters having Min Max specifications are guaranteed The Test Level column indicates the specific device testing actually performed during production and Quality inspection Elantec performs most electrical tests using modern high-speed automatic test equipment specifically the LTX77 Series system Unless otherwise noted all tests are pulsed tests therefore TJ e TC e TA Test Level I II III IV V Test Procedure 100% production tested and QA sample tested per QA test plan QCX0002 100% production tested at TA e 25 C and QA sample tested at TA e 25 C TMAX and TMIN per QA test plan QCX0002 QA sample tested per QA test plan QCX0002 Parameter is guaranteed (but not tested) by Design and Characterization Data Parameter is typical value at TA e 25 C for information purposes only
Open Loop DC Electrical Characteristics
Provisional Supplies at g15V Load e 1 kX TA e a 25 C Parameter Description Temp Min Typ Max Test Level Units
Amplifier Section (HOLD e 5V) VOS Ib a Ibb ROL RINb CMRR VO ISC Restore Section VOS Comp Ib a r IOUT CMRR Composite Input Offset Voltage (Note 3) Restore In a Input Bias Current Restoring Current Available Common Mode Rejection Ratio (Note 2)
a 25 C a 25 C a 25 C a 25 C
Input Offset Voltage IN a Input Bias Current INb Input Bias Current Transimpedance (Note 1) INb Resistance Common Mode Rejection Ratio (Note 2) Output Voltage Swing Short Circuit Current (IN a Only Driven to 0 5V)
a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C
12 1 18 180 800 20 44
g12
25 5 150
II II II II V II II II
mV mA mA kX X dB V mA
60
g13
45
100
3 3 180 60 300 70
7 12
II II II II
mV mA mA dB TD is 3 5in
2
EL4089C
DC Restored Video Amplifier
Open Loop DC Electrical Characteristics
Provisional Supplies at g15V Load e 1 kX TA e a 25 C Parameter Restore Section PSRR VTHRESHOLD IIH Hold IIL Hold Supply Current Isy Hold Isy Sampling Supply Current (HOLD e 5V) Supply Current (HOLD e 0V)
a 25 C a 25 C
Contd
Min Typ Max Test Level Units
Description Contd Power Supply Rejection Ratio (Note 4) HOLD Logic Threshold HOLD Input Current HOLD Input Current Logic High Logic Low
Temp
a 25 C a 25 C a 25 C a 25 C
60 08
90 20 1 5 5 15
II II II II
dB V mA mA
48 50
60 65
90 11 0
II II
mA mA
Closed Loop AC Electrical Characteristics
Provisional Supplies at g15V Load e 150X and 15 pF Rf and Rg e 300X AV e 2 TA e 25 C (See Note 7 about Test Fixture) Parameter Amplifier Section SR SR BW BW dG dPh Restore Section SR THE THD Note Note Note Note Note Note Note 1 2 3 4 5 6 7 Restore Amplifier Slew Rate (Test Circuit) 20%-80% Time to Enable Hold Time to Disable Hold 25 25 40 V V V V ms ns ns TD is 3 2in Slew Rate (Note 5) Slew Rate with g5V Supplies (Note 5) Bandwidth g5V Supplies Bandwidth g5V Supplies Differential Gain at 3 58 MHz (Note 6) Differential Phase at 3 58 MHz (Note 6)
b 3 dB b 3 dB
g0 1 dB g0 1 dB
Description
Min
Typ
Max
Test Level
Units
500 275 60 55 25 23 0 02 0 03 0 05 0 06
V V V V V V V V V V
V ms V ms MHz MHz MHz MHz % %
VS e g15V VS e g5V VS e g15V VS e g5V
For current feedback amplifiers AVOL e ROL RINb VCM e g10V for VS e g15V Measured from S H Input to amplifier output while restoring VOS is measured at VS e g4 5V and VS e g16V both supplies are changed simultaneously SR measured at 20% to 80% of a 4V pk-pk square wave DC offset from b0 714V through a 0 714V ac amplitude is 286 mVp-p equivalent to 40 ire Test fixture was designed to minimize capacitance at the IN b input A ``good'' fixture should have less than 2 pF of stray capacitance to ground at this very sensitive pin See application notes for further details
3
TD is 3 2in
EL4089C
DC Restored Video Amplifier
Typical Performance Curves
Supply Current vs Temperature VS e g15V Supply Current vs Supply Voltage
4089 - 2
4089 - 3
Restoring Current vs Temperature
Amplifier Input Current vs Die Temperature
4089 - 4
4089 - 5
Amplifier Output Voltage vs Die Temperature VS e g15V
Amplifier Offset Voltage vs Die Temperature
4089 - 6
4089 - 7
4
EL4089C
DC Restored Video Amplifier
Typical Performance Curves
CMRR for Amplifier and Restore Section vs Die Temperature
Contd
Transimpedance (ROL) vs Die Temperature
4089 - 8
4089 - 9
Relative Frequency Response for Various Gains RF e 300X
Frequency Response vs Supply AV e 2 RF e 300
4089 - 10
4089 - 11
Frequency Response Flatness vs Supply AV e 2 RF e 300
Frequency Response Flatness for Various Load and Supply Conditions AV e 2 RF e 300
4089 - 12
4089 - 13
5
EL4089C
DC Restored Video Amplifier
Typical Performance Curves
Frequency Response Flatness vs CIN b AV e 2 RF e 300
Contd
Differential Gain vs DC Input Offset AV e 2 FO e 3 58 MHz RL e 150X
4089 - 14 4089 - 15
Differential Phase vs DC Input Offset AV e 2 FO e 3 58 MHz RL e 150X
4089 - 16
8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature
8-Lead SO Maximum Power Dissipation vs Ambient Temperature
4089 - 17
4089 - 18
6
EL4089C
DC Restored Video Amplifier
Typical Application
The EL4089 can be used to DC-restore a video waveform (see Fig 1) The above circuit forces the cable driving video amplifier's output to ground when the HOLD pin is at a logic low The ``correction voltage'' is stored on capacitor CX1 an external ceramic capacitor The capacitor value is chosen from the system requirements The typical input bias current to the video amplifier is 1 mA so for a 62 ms hold time and a 0 01 mF capacitor the output voltage drift is 6 2 mV in one line The S H amplifier can provide a typical current of 300 mA to charge capacitor CX1 so with a 1 2 ms sampling time the output can be corrected by 36 mV in each line Using a smaller value of CX1 increases both the voltage that can be corrected and the drift while being held likewise using a larger value of CX1 reduces the voltages The RX1 resistor is in the circuit purely to simulate some external source impedance and is not needed as a real component Likewise for RX2 The 75X back terminating resistor RXT is recommended when driving 75X cables The board layout should have a ground plane underneath the EL4089 with the ground plane cut away from the vicinity of the VIN b pin (pin 1) This helps to minimize the stray capacitance on pin 1 Power supply bypassing is important and a 0 1 mF ceramic capacitor from each power pin to ground placed very close to the power pins together with a 4 7 mF tantalum bead capacitor is recommended When both digital and Analog grounds are on the same board the EL4089 should be on the Analog ground The digital ground can be connected to the Analog ground through a 100X -300X resistor near the EL4089 This allows the digital signal a return path while preventing the digital noise from corrupting the analog ground
4089 - 19
Figure 1
7
EL4089C
EL4089C
DC Restored Video Amplifier
Table of Charge Storage Capacitor vs Droop Charging Rates
Cap Value nF 10 33 100 Droop in 60 ms mV 6 18 06 Charge in 1 2 ms mV 36 11 36 Charge in 4 ms mV 120 36 12
Basic formulae are V (droop) e Ib a (Line time b Sample time) Capacitor and V (charge) e IOUT Sample time Capacitor
For best results the source impedance should be kept low using a buffer for example Because the S H effectively shorts the input signal during Sample the input should not be sam-
pled during active video Typically the sample is made during the back porch period of horizontal blanking For this reason color composite signals which have color burst on the back porch can not be passed See EL2090 or EL4093 for this application
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
WARNING
Life Support Policy
January 1996 Rev B
Elantec Inc 1996 Tarob Court Milpitas CA 95035 Telephone (408) 945-1323 (800) 333-6314 Fax (408) 945-9305 European Office 44-71-482-4596
8
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
Printed in U S A

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