EL4089C EL4089C DC Restored Video Amplifier Features General Description # 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 g 5V to g 15V # TTL/CMOS hold signal 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. Applications # Input amplifier in video equipment # Restoration amplifier in video mixers Ordering Information Part No. Temp. Range EL4089CN 0§ C to a 75§ C EL4089CS 0§ C to a 75§ C Package OutlineÝ 8-Pin P-DIP MDP0031 8-Lead SO MDP0027 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. Connection Diagram 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. January 1996 Rev B 4089 – 1 DC restoring amplifier with a gain of 2, restoring to ground. 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 g 15V, Load e 1 kX; TA e a 25§ C Parameter Description Temp Min Typ Max Test Level Units 12 25 II mV Amplifier Section (HOLD e 5V) VOS Input Offset Voltage a 25§ C Ib a IN a Input Bias Current a 25§ C 1 5 II mA Ibb INb Input Bias Current a 25§ C 18 150 II mA ROL Transimpedance (Note 1) a 25§ C 800 II kX RINb INb Resistance a 25§ C 20 V X CMRR Common Mode Rejection Ratio (Note 2) a 25§ C 44 60 II dB VO Output Voltage Swing a 25§ C g 12 g 13 II V ISC Short Circuit Current (IN a Only Driven to 0.5V) a 25§ C 45 100 II mA Composite Input Offset Voltage (Note 3) a 25§ C Ib a ,r Restore In a Input Bias Current a 25§ C IOUT Restoring Current Available a 25§ C 180 300 CMRR Common Mode Rejection Ratio (Note 2) a 25§ C 60 70 180 VOS, Comp 2 3 7 II mV 3 12 II mA II mA II dB TD is 3.5in Restore Section TD is 3.2in EL4089C DC Restored Video Amplifier Open Loop DC Electrical Characteristics Ð Contd. Provisional Supplies at g 15V, Load e 1 kX; TA e a 25§ C Parameter Max Test Level Units II dB Description Temp Min Typ Power Supply Rejection Ratio (Note 4) a 25§ C 60 90 VTHRESHOLD HOLD Logic Threshold a 25§ C 0.8 2.0 II V IIH, Hold HOLD Input Current @ Logic High a 25§ C 1 5 II mA IIL, Hold HOLD Input Current @ Logic Low a 25§ C 5 15 II mA Restore Section ÐContd. PSRR Supply Current Isy, Hold Supply Current (HOLD e 5V) a 25§ C 4.8 6.0 9.0 II mA Isy, Sampling Supply Current (HOLD e 0V) a 25§ C 5.0 6.5 11.0 II mA Closed Loop AC Electrical Characteristics Provisional Supplies at g 15V, 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 Description Min Typ Max Test Level Units Amplifier Section SR Slew Rate (Note 5) 500 V V/ms SR Slew Rate with g 5V Supplies (Note 5) 275 V V/ms BW Bandwidth g 5V Supplies b 3 dB b 3 dB 60 55 V V MHz MHz BW Bandwidth g 5V Supplies g 0.1 dB g 0.1 dB 25 23 V V MHz MHz dG Differential Gain at 3.58 MHz (Note 6) VS e g 15V VS e g 5V 0.02 0.03 V V % % dPh Differential Phase at 3.58 MHz (Note 6) VS e g 15V VS e g 5V 0.05 0.06 V V § § 25 V V/ms SR Restore Amplifier Slew Rate (Test Circuit) 20%–80% THE Time to Enable Hold 25 V ns THD Time to Disable Hold 40 V ns Note Note Note Note Note Note Note 1: For current feedback amplifiers, AVOL e ROL/RINb. 2: VCM e g 10V for VS e g 15V. 3: Measured from S/H Input to amplifier output, while restoring. 4: VOS is measured at VS e g 4.5V and VS e g 16V, both supplies are changed simultaneously. 5: SR measured at 20% to 80% of a 4V pk-pk square wave. 6: DC offset from b0.714V through a 0.714V, ac amplitude is 286 mVp-p, equivalent to 40 ire. 7: 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 Restore Section EL4089C DC Restored Video Amplifier Typical Performance Curves Supply Current vs Temperature VS e g 15V 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 g 15V Amplifier Offset Voltage vs Die Temperature 4089 – 6 4089 – 7 4 EL4089C DC Restored Video Amplifier Typical Performance Curves Ð Contd. CMRR for Amplifier and Restore Section vs Die Temperature 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 for Various Load and Supply Conditions AV e 2; RF e 300 Frequency Response Flatness vs Supply AV e 2; RF e 300 4089 – 12 4089 – 13 5 EL4089C DC Restored Video Amplifier Typical Performance Curves Ð Contd. Differential Gain vs DC Input Offset; AV e 2, FO e 3.58 MHz, RL e 150X Frequency Response Flatness vs CIN b ; AV e 2; RF e 300 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 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. 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 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. 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. 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. 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. 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. 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. 4089 – 19 Figure 1 7 EL4089C EL4089C DC Restored Video Amplifier Table of Charge Storage Capacitor vs Droop Charging Rates Cap Value nF Droop in 60 ms mV Charge in 1.2 ms mV Charge in 4 ms mV 10 33 100 6 1.8 0.6 36 11 3.6 120 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. 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. Because the S/H effectively shorts the input signal during Sample, the input should not be sam- 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. January 1996 Rev B WARNING Ð 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, 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 Printed in U.S.A.