UCT T PROD ACEMEN at E T L E r L P e E O t OBS NDED R port Cen /tsc E p m M u S co ECOM echnical .intersil. w NO R T w r Data Sheet November 14, 2002 u w ct o L or conta -INTERSI 1-888 ® EL2110 FN7042 Low Cost, Gain of 1, Video Op Amp Features The EL2110 operational amplifier, built using Elantec’s complementary bipolar process, offers unprecedented high frequency performance at a very low cost. It is suitable for any application, such as consumer video, where traditional DC performance specifications are of secondary importance to the high frequency specifications. On a 5V supply at a gain of +1 the EL2110 will drive a 150Ω load to +2V, with a bandwidth of 50MHz. This device achieves 0.1dB bandwidth at 5MHz. • Optimized for 5V operation The recommended power supply voltage is 5V. At zero and 5V supplies, the inputs will operate to ground. When the outputs are at 0V the amplifier draws only 2.4mA of supply current. • Consumer video amplifier • Stable at gain of 1 • 50MHz gain bandwidth product • 130V/µs slew rate • Drives 150Ω load to video levels • Input and outputs operate at negative supply rail Applications • Active filters/integrators • Cost sensitive applications • Single supply amplifiers Ordering Information PART NUMBER PACKAGE TAPE & REEL PKG. NO. EL2110CN 8-Pin PDIP - MDP0031 EL2110CS 8-Pin SO - MDP0027 EL2110CW 5-Pin SOT-23* - MDP0038 *EL2110CW symbol is .Dxxx where xxx represents date code Pinouts EL2110 (8-PIN PDIP, SO) TOP VIEW EL2110 (5-PIN SOT23) TOP VIEW OUT 1 GND 2 IN+ 3 5 VS+ - 8 NC NC 1 IN- 2 + - 7 VS+ + 4 IN- IN+ 3 GND 4 1 6 OUT 5 NC CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 321-724-7143 | Intersil (and design) is a registered trademark of Intersil Americas Inc. Copyright © Intersil Americas Inc. 2003. All Rights Reserved. Elantec is a registered trademark of Elantec Semiconductor, Inc. All other trademarks mentioned are the property of their respective owners. EL2110 Absolute Maximum Ratings (TA = 25°C) Power Dissipation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . See Curves Storage Temperature Range . . . . . . . . . . . . . . . . . .-65°C to +150°C Operating Temperature Range . . . . . . . . . . . . . . . . -40°C to +85°C Total Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18V Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -6VS Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6V Peak Output Current . . . . . . . . . . . . . . . . . . . . . . 75mA per amplifier CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied. IMPORTANT NOTE: All parameters having Min/Max specifications are guaranteed. Typical values are for information purposes only. Unless otherwise noted, all tests are at the specified temperature and are pulsed tests, therefore: TJ = TC = TA DC Electrical Specifications PARAMETER VS = +5V, RL = 1kΩ, VIN = 1V, TA = 25°C unless otherwise specified. DESCRIPTION CONDITIONS MIN TYP MAX UNIT -20 10 20 mV VOS Input Offset Voltage TCVOS Average Offset Voltage Drift IB Input Bias Current -15 -7 -3 µA IOS Input Offset Current -1 0.3 1.0 µA TCIOS Average Offset Current Drift (Note 1) AVOL Open Loop Gain VOUT = 0.5, 2.5, RL = 1kΩ (Note 1) -50 µV/°C -3 nA/°C 160 250 V/V VOUT = 0.5, 2.5, RL = 150kΩ 160 250 V/V PSRR Power Supply Rejection Ratio VS = 4.5V to 5.5V 43 50 dB CMRR Common Mode Rejection Ratio VCM = 0V to 3.8V 55 65 dB CMIR Common Mode Input Range VOUT Output Voltage Swing RFB = RG = 1kΩ, RL = 150Ω 2.8 3.2 V ISC Output Short Circuit Current Output to Ground (Note 2) 75 125 mA IS Supply Current No load (per channel) VIN = 0V 2.0 2.4 RIN Input Resistance Differential 150 kΩ Common mode 1.5 MΩ 1 pF 0.150 W CIN Input Capacitance ROUT Output Resistance PSOR Power Supply Operating Range 0.0 AV = 1 @ 10MHz Single supply 3.0 4 3.0 V mA 6 V MAX UNIT NOTES: 1. Measured from TMIN to TMAX. 2. A heat-sink is required to keep junction temperature below absolute maximum when an output is shorted. Closed-Loop AC Electrical Specifications PARAMETER BW VS = 5V, AC Test Figure, TA = 25°C unless otherwise specified. DESCRIPTION -3dB Bandwidth (VOUT = 0.4mVP-P) CONDITIONS MIN TYP AV = 1 100 MHz ±0.1dB Bandwidth (VOUT = 0.4mVP-P) AV = 1 10 MHz GBWP Gain Bandwidth Product 50 MHz PM Phase Margin 55 ° SR Slew Rate 85 130 V/µs FBWP Full Power Bandwidth (Note 1) 8 11 MHz tR , tF Rise Time, Fall Time 0.1V step 2 ns OS Overshoot 0.1V step 15 % 2 EL2110 Closed-Loop AC Electrical Specifications PARAMETER VS = 5V, AC Test Figure, TA = 25°C unless otherwise specified. (Continued) DESCRIPTION tPD Propagation Delay tS Settling to 0.1% (AV = 1) dG CONDITIONS MIN TYP MAX UNIT 3.5 ns VS = 5V, 2V step 80 ns Differential Gain (Note 2) NTSC/PAL 0.1 % dP Differential Phase (Note 2) NTSC/PAL 0.2 ° eN Input Noise Voltage 10kHz 15 nV/√Hz iN Input Noise Current 10kHz 1.5 nV/√Hz CS Channel Separation P = 5MHz 55 dB NOTES: 1. For VS = 5V, VOUT = 4VP-P. Full power bandwidth is based on slew rate measurement using: FPBW = SR/(2pi*VPEAK) 2. Video performance measured at VS = 5V, AV = 2 with 2 times normal video level across RL = 150Ω 3 EL2110 Typical Performance Curves 8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature 8-Pin SO Maximum Power Dissipation vs Ambient Temperature Simplified Block Diagram 5-Pin SOT23 Maximum Power Dissipation vs Ambient Temperature ± supplies. All electrical characteristics are measured with a 5V supply. Output Swing vs Load Please refer to the simplified block diagram. This amplifier provides an NPN pull-up transistor output and a passive 1250Ω pull-down resistor to the most negative supply. In a application where the load is connected to VS- the output voltage can swing to within 200mV of VS-. Output Drive Capability This device does not have short circuit protection. Each output is capable of than 100mA into a shorted output. Care must be used in the design to limit the output current with a series resistor. Single 5V Supply Video Cable Driver Applications Information Product Description The EL2110 operational amplifier is stable at a gain of 1. It is built on Elantec’s proprietary complimentary bipolar process. This topology allows it to be used in a variety of applications where current mode amplifiers are not appropriate because of restrictions placed on the feedback elements. This product is especially designed for applications where high bandwidth and good video performance characteristics are desired but the higher cost of more flexible and sophisticated products are prohibitive. Power Supplies The EL2110 is designed to work at a supply voltage difference of 4.5V to 5.5V. It will work on any combination of 4 These amplifiers may be used as a direct coupled video cable driver with a gain of 2. With a 75Ω back matching resistor driving a terminated 75Ω cable the output at the cable load will be original video level (1V NTSC). The best operating mode is with direct coupling. The input signal must be offset to keep the entire signal within the range of the amplifier. The required offset voltage can be set with a resistor divider and a bypass capacitor in the video path (Figure 1). The input DC offset should be between 0.3V and 0.5V. With RA = 68k and RB = 4.7k the input offset will be 0.32V. Since these amplifiers require a DC load at their outputs it is good design practice to add a 250Ω resistor to ground directly at the amplifier output. Then if the 75Ω cable termination resistor were inadvertently removed there would still be an output signal. The values in Figure 1 give an output range of 0V to 2.6V. Output capacitive coupling also has some restrictions. These amplifiers require a DC load at their outputs. A 75Ω back EL2110 (Figure 2) and with a white picture level is about 583mV (Figure 3). This gives a maximum change in average value of about 555mV. A direct coupled amplifier with a standard NTSC video signal needs a dynamic range of 1.143V. But with input capacitance coupling the dynamic range requirements are the sum of the 1.143V video plus the average picture value change of 0.555V or 1.698VP-P. At a gain of two this doubles to 3.394V. These amplifiers do not have this much dynamic range so a gain of less than 2 must be used to avoid waveform compression under all conditions. matching resistor to a cable and a 75Ω load to ground at the end of the cable provide a 150Ω DC load. But output capacitive coupling opens this DC path so an extra pulldown resistor on the amplifier output to ground is required. Figure 4 shows a 250Ω resistor. Capacitively coupling the output will require that we shift the output offset voltage higher than in the direct coupled case. Using RA = 43k and RB = 4.7k will make the quiescent output offset voltage about 1V. The output dynamic range will be 0.6V to 3V. Input capacitive coupling will increase the needed dynamic range of the amplifier. The standard NTSC video signal is 1V peak to peak plus 143mV for the color AC peak. The video signal is made up of the -286mV sync pulse plus the 714mV picture signal which may very from 0V to 714mV. The video signal average value for a black picture is about 28mV 0.1µF Capacitively coupling the input and output is worse than a capacitor only on the input. Without any special compromises you can only take a gain of one. But if the backmatch resistor is reduced to 36Ω, reducing the output 0.32VB 68K RA CB 4.7K + AMP 0.64VB V AMP VOUT 1V 250 RIS RCL RO 75 75 75 RB RPD VIN 1K 1K + – RG 75 RIL RF Video 1V + – V1 5V FIGURE 1. VIDEO PATH Gain = 2 1.428 1.166 1.8V offset Amp OutVolts 2.062 1.8 0 -0.572 +0.348 +0.062 Gain = 2 1.8V offset Amp Out Volts Ý10µs 53µs 0.714V 0.6 0.583V 0.867 0.0V -0.286V 1.3µs 3.8µs 5.1µs FIGURE 2. WHITE LEVEL VIDEO 0.714V +3.172 53mV Average BL +45mV 0.686V 0.0V -0.286V +28mV +56mV +1.8 +1.172 Average Picture Value Change — 555mV FIGURE 3. BLACK LEVEL VIDEO 5 EL2110 Printed Circuit Layout range requirement 25% and the output offset is shifted to 2.1V you can take a gain of 1.5 and have a standard NTSC 1V at the 75Ω load. The EL2110 is well behaved, and easy to apply in most applications. However, a few simple techniques will help assure rapid, high quality results. As with any high frequency device, good PCB layout is necessary for optimum performance. Ground-plane construction is highly recommended, as is good power supply bypassing. A 0.1µF ceramic capacitor is recommended for bypassing both supplies. Pin lengths should be as short as possible, and bypass capacitors should be as close to the device pins as possible. For good AC performance, parasitic capacitances should be kept to a minimum at both inputs and at the output. Resistor values should be kept under 5kΩ because of the RC time constants associated with the parasitic capacitance. Metal-film and carbon resistors are both acceptable, use of wire-wound resistors is not recommended because of their parasitic inductance. Similarly, capacitors should be low-inductance for best performance. A simple transistor, capacitor and resistor sync tip clamp may be used when the input is already AC coupled to set the sync tip to ground. This gives the input a fixed DC level and can be used like a direct coupled input. The clamp uses a PNP transistor with the collector at ground and the base has a 200kΩ resistor to 5V. The emitter connects to the amplifier input and a capacitor from the video input. The clamp functions as an inverted Beta current source for input bias current with plus inputs and a clamp to ground for minus inputs. The RA and RB resistors are removed for the clamp option (Figure 4). 2N3904 Clamp Option 200K PNP RC 12K RA 1.4VB V AMP 36 RO RPD 250 - 47µF VOUT 1V CO 75 2.1VB RCL AMP RB VIN + 4.7K CI CB 0.1µF 47µF RIS + – RG 2K RIL RF 75 75 1K 5V V1 + Video – 1V FIGURE 4. All Intersil U.S. products are manufactured, assembled and tested utilizing ISO9000 quality systems. Intersil Corporation’s quality certifications can be viewed at www.intersil.com/design/quality Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries. For information regarding Intersil Corporation and its products, see www.intersil.com 6