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| EL4390C EL4390C Triple 80 MHz Video Amplifier with DC Restore Features 80 MHz b 3 dB bandwidth for gains of 1 to 10 800 V ms slew rate 15 MHz bandwidth flat to 0 1 dB Excellent differential gain and phase TTL CMOS compatible DC restore function Available in 16 lead P-DIP 16 lead SOL General Description The EL4390C is three wideband current-mode feedback amplifiers optimized for video performance each with a DC restore amplifier The DC restore function is activated by a common TTL CMOS compatible control signal while each channel has a separate restore reference Each amplifier can drive a load of 150X at video signal levels The EL4390C operates on supplies as low as g4V up to g15V Being a current-mode feedback design the bandwidth stays relatively constant at approximately 80MHz over the g1 to g10 gain range The EL4390C has been optimized for use with 1300X feedback resistors Applications RGB drivers requiring DC restoration RGB multiplexers requiring DC restoration RGB building blocks Video gain blocks requiring DC restoration Sync and color burst processing Connection Diagram Ordering Information Part No Temp Range Package Outline EL4390CN b 40 C to a 85 C 16-Pin P-DIP MDP0031 EL4390CM b 40 C to a 85 C 16-Lead SOL MDP0027 November 1994 Rev A 4390 - 1 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 1994 Elantec Inc EL4390C Triple 80 MHz Video Amplifier with DC Restore Absolute Maximum Ratings (TA e 25 C) Voltage between VS a and VSb Voltage at VS a Voltage at VSb Voltage between VIN a and VINb Current into VIN a and VINb a 33V a 18V b18V g6V Internal Power Dissipation Operating Ambient Temp Range Operating Junction Temperature Storage Temperature Range See Curves b 40 C to a 85 C 150 C b 65 C to a 150 C 5mA 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 Supplies at g15V Parameter Description Temp Min Typ Load e 1KX Max Test Level Units Amplifier Section (not restored) VOS IB a IBb ROL RINb CMRR PSRR VO ISC ISY Input Offset Voltage IIN a Input Bias Current IINb Input Bias Current Transimpedance (Note 1) INb Resistance Common-Mode Rejection Ratio (Note 2) Power Supply Rejection Ratio (Note 4) Output Voltage Swing RL e 1kX Short-Circuit Current Supply Current (Quiescent) a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C 2 02 10 100 220 50 50 50 g12 15 5 65 II II II II V II II II mV mA mA kX X dB dB V mA mA 56 70 g13 45 10 70 20 100 32 II II Restoring Section VOS COMP IB a R IOUT PSRR GOUT ISY RES VIL RES VIH RES Composite Input Offset Voltage (Note 3) Restore IN a Input Bias Current Restoring Current Available Power Supply Rejection Ratio (Note 4) Conductance Supply Current Restoring RES Logic Low Threshold RES Logic High Threshold a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C a 25 C 8 02 2 50 4 70 8 10 23 10 14 18 35 5 II II II II V mV mA mA dB mA V TD is 4 1in mA V V 37 14 II II II 2 EL4390C Triple 80 MHz Video Amplifier with DC Restore Open Loop DC Electrical Characteristics Supplies at g15V Parameter Restoring Section IIL RES IIH RES Note Note Note Note 1 2 3 4 RES Input Current Logic Low RES Input Current Logic High a 25 C a 25 C Load e 1KX Max Contd Test Level Units TD is 0 9in TD is 2 7in Description Temp Min Typ 2 05 10 3 II II mA mA For current feedback amplifiers AVOL e ROL RINb VCM e g10V for VS e g15V Measured from VCL to amplifier output while restoring VOS is measured at VS e g4 5V and VS e g16V both supplies are changed simultaneously Closed Loop AC Electrical Characteristics Supplies at g15V Load e 150X and 15 pF TA e 25 C (See note 7 re test fixture) Parameter Amplifier Section SR SR BW BW dG di Restoring Section TRE TRD Time to Enable Restore Time to Disable Restore 35 35 V V ns ns Slew Rate (Note 5) Slew Rate w g5V Supplies (Note 5) Bandwidth b3dB AV e 1 g5V Supplies b 3dB Bandwidth b0 1 dB g5V Supplies b 0 1dB Differential Gain at 3 58 MHz at g5V Supplies (Note 6) Differential Phase at 3 58 MHz at g5V Supplies (Note 6) 800 550 95 72 20 14 0 02 0 02 0 03 0 06 V V V V V V V V V V V ms V ms MHz MHz MHz MHz % % () () Description Min Typ Max Test Level Units Note 5 SR is measured at 20% to 80% of 4V pk-pk square wave with AV e 5 RF e 820X RG e 200X Note 6 DC offset from b0 714V to a 0 714V AC amplitude is 286m Vp-p equivalent to 40 ire Note 7 Test fixture was designed to minimize capacitance at the INb 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 EL4390C Triple 80 MHz Video Amplifier with DC Restore Table 1 Charge Storage Capacitor Value vs Droop and Charging Rates Cap Value (nF) 10 22 47 100 220 Droop in 60mS (mV) 30 13 6 64 30 1 36 Charge in 2mS (mV) 400 182 85 40 18 Charge in 4mS (mV) 800 364 170 80 36 These numbers represent the worst case bias current and the worst case charging current Note that to get the full (2mA a ) charging current the clamp input must have l 250mV of error voltage Note that the magnitude of the bias current will decrease as temperature increases The basic droop formula is V (droop) e IB a c (Line time b Charge time) and the basic charging formula is V (charge) e IOUT c Charge time capacitor value capacitor value 120 Where IOUT is IOUT e (Clamp voltage b IN a voltage) 4 EL4390C Triple 80 MHz Video Amplifier with DC Restore Typical Performance Curves Gain Flatness for Various RF VS e g15V AV e 0 dB Gain Flatness for Various RF VS e g5V AV e 0 dB Gain Flatness for Various RF and RG Values VS e g15V AV e 6 dB 4390 - 2 4390 - 3 4390 - 4 Gain Flatness for Various RF and RG Values VS e g5V AV e 6 dB Phase Shift for AV e 2 RF e RG e 1300X Phase Shift for AV e 2 RF e RG e 1000X at VS e g5V and VS e g15V 4390 - 5 4390 - 7 4390 - 6 Gain Flatness VS e g15V AV e 14 dB RF RG as Shown Gain Flatness VS e g5V AV e 14 dB RF RG as Shown Phase Shift for AV e 5 dB RF e 820X RG e 200X VS e g5V 4390 - 8 4390 - 9 4390 - 10 5 EL4390C Triple 80 MHz Video Amplifier with DC Restore Typical Performance Curves Gain Flatness VS e g5V AV e 20 dB RF RG as Shown Contd Gain Flatness VS e g5V AV e 26 dB RF e 680X RG e 36X Differential Gain at VS e g15V 4390 - 11 4390 - 12 4390 - 17 Differential Phase at VS e g15V Differential Gain at VS e g5V Differential Phase at VS e g5V 4390 - 19 4390 - 18 4390 - 20 Frequency Response for Various CLOAD VS e g15V RF e RG e 1300X Frequency Response for Various CLOAD VS e g5V RF e RG e 1300X Crosstalk Channel R and B to Channel G VS e g5V RF e 1300X 4390 - 13 4390 - 14 4390 - 15 6 EL4390C Triple 80 MHz Video Amplifier with DC Restore Typical Performance Curves Crosstalk Channel R and G to Channel B VS e g5V RF e 1300X Contd IN a Input Impedance during SAMPLE VS e g5V IN a Input Impedance during HOLD VS e g5V 4390 - 21 4390 - 22 4390 - 16 Phase Shift at IN a Pin during Restore RS e 75X and 150X VS e g5V IOUT Restoring vs Clamp Voltage at VS e g5V Pulse Response with AV e 2 RF e RG e 1300X at VS e g5V 4390 - 24 4390 - 25 4390 - 23 Output during DC-Restoration Showing DC Droop RF e RG e 1300X VS e g5V Output during DC-Restoration RF e RG e 1300X VS e g5V Pulse Response with AV e 5 RF e 820X and RG e 200X at VS e g15V 4390 - 27 4390 - 26 4390 - 28 7 EL4390C Triple 80 MHz Video Amplifier with DC Restore Typical Performance Curves Maximum Power Dissipation vs Ambient Temperature 16-Pin PDIP Contd Maximum Power Dissipation vs Ambient Temperature 16-Pin SOL 4390 - 29 4390 - 30 4390 - 31 Simplified Schematic of One Channel of EL4390 8 EL4390C Triple 80 MHz Video Amplifier with DC Restore Applications Information Circuit Operation Each channel of the EL4390 contains a current feedback amplifier and a TTL CMOS compatible clamp circuit The current that the clamp can source or sink into the non-inverting input is approximately I e (VCLAMP b VIN a ) 120 So when the non-inverting input is at the same voltage as the clamp reference no current will flow and hence no charge is added to the capacitor When there is a difference in voltage current will flow in an attempt to cancel the error AT THE NON-INVERTING input The amplifier's offset voltage and (IB b c RF) DC errors are not cancelled with this loop It is purely a method of adding a controlled DC offset to the signal As well as the offset voltage error which goes up with gain and the IB b c RF error which drops with gain there is also the IB a error term Since the amplifier is capacitively coupled this small current is slowly integrated and shows up as a very slow ramp voltage Table below shows the output voltage drift in 60mS for various values of coupling capacitor all assuming the very worst IB a current Table 1 Charge Storage Capacitor Value vs Droop and Charging Rates Cap Value (nF) 10 22 47 100 220 Droop in 60mS (mV) 30 13 6 64 30 1 36 Charge in 2mS (mV) 400 182 85 40 18 Charge in 4mS (mV) 800 364 170 80 36 In normal circuit operation the picture content will also cause a slow change in voltage across the capacitor so at every back porch time period these error terms can be corrected When a signal source is being switched eg from two different surveillance cameras it is recommended to synchronize the switching with the vertical blanking period and to drive the HOLD pin (pin 6) low during these lines This will ensure that the system has been completely restored regardless of the average intensity of the two pictures Application Hints Figures 1 2 shows a three channel DC-restoring system suitable for R-G-B or Y-U-V component video or three synchronous composite signals Figure 1 shows the amplifiers configured for noninverting gain and Figure 2 shows the amplifiers configured for inverting gains Note that since the DC-restoring function is accomplished by clamping the amplifier's non-inverting input during the back porch period any signal on the non-inverting input will be distorted For this reason it is recommended to use the inverting configuration for composite video since this avoids the color burst being altered during the clamp time period Since all three amplifiers are monolithic they run at the same temperature and will have very similar input bias currents This can be used to advantage in situations where the droop voltage needs to be compensated since a single trim circuit can be used for all three channels A 560KX or similar value resistor helps to isolate each signal See Figure 2 The advantage of compensating for the droop voltage is that a smaller capacitor can be used which allows a larger level restoration within one line See Table 1 for values of capacitor and charge droop rates 9 EL4390C Triple 80 MHz Video Amplifier with DC Restore Applications Information Contd 4390 - 32 Figure 1 10 EL4390C Triple 80 MHz Video Amplifier with DC Restore Applications Information Contd 4390 - 33 Figure 2 11 EL4390C Triple 80 MHz Video Amplifier with DC Restore Applications Information Contd 4390 - 34 Figure 3 12 EL4390C Triple 80 MHz Video Amplifier with DC Restore Applications Information Contd In Figure 3 one of the three channels is used together with a low-offset op-amp to automatically trim the bias current of the other two channels The two remaining channels are shown in the non-inverting configuration but could equally well be set to provide inverting gains Two DC-restored channels are typically needed in fader applications See the EL4094 and EL4095 for suitable monolithic video faders Layout and Dissipation Considerations As with all high frequency circuits the supplies should be bypassed with a 0 1mF ceramic capacitor very close to the supply pins and a 4 7mF tantalum capacitor fairly close to handle the high current surges While a ground plane is recommended the amplifier will work well with a ``star'' grounding scheme The pin 3 ground is only used for the internal bias generator and the reference for the TTL compatible ``HOLD'' input As with all current feedback capacitors all stray capacitance to the inverting inputs should be kept as low as possible to avoid unwanted peaking at the output This is especially true if the value of Rf has already been reduced to raise the bandwidth of the part while tolerating some peaking In this situation additional capacitance on the inverting input can lead to an unstable amplifier Since there are three amplifiers all in one package and each amplifier can sink or source typically more than 70mA some care is needed to avoid excessive die temperatures Sustained DC currents of over 30mA are not recommended due to the limited current handling capability of the metal traces inside the IC Also the short circuit protection can be tripped with currents as low as 45mA which is seen as excessive distortion in the output waveform As a quick rule of thumb both the SOL and DIP 16 pin packages can dissipate about 1 4 watts at 25 C and with g15V supplies and a worst case quiescent current of 32mA yields 0 96 watts before any load is driven Dissipation of the EL4390 can be reduced by lowering the supply voltage Although some performance is degraded at lower supplies as seen in the characteristic curves it is often found to be a useful compromise The bandwidth can be recovered by reducing the value of RF and RG as appropriate 13 EL4390C Triple 80 MHz Video Amplifier with DC Restore 14 EL4390C Triple 80 MHz Video Amplifier with DC Restore 15 EL4390C EL4390C Triple 80 MHz Video Amplifier with DC Restore 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 November 1994 Rev A 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 16 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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