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| EL2120C EL2120C 100 MHz Current Feedback Amplifier Features Excellent differential gain and phase on g5V to g15V supplies 100 MHz b 3 dB bandwidth from gains of g1 to g10 700 V ms slew rate 0 1 dB flatness to 20 MHz Output disable in 50 ns - remains high impedance even when driven with large slew rates Single a 5V supply operation AC characteristics are lot and temperature stable Available in small SO-8 package General Description The EL2120C is a wideband current feedback amplifier optimized for video performance Its 0 01% differential gain and 0 03 degree differential phase performance when at g5V supplies exceeds the performance of other amplifiers running on g15V supplies Operating on g8 to g15V supplies reduces distortions to 0 01% and 0 01 degrees and below The EL2120C can operate with supplies as low as g2 5V or a single a 5V supply Being a current feedback design bandwidth is a relatively constant 100 MHz over the g1 to g10 gain range The EL2120C has been optimized for flat gain over frequency and all characteristics are maintained at positive unity gain Because the input slew rate is similar to the 700 V ms output slew rate the part makes an excellent high-speed buffer The EL2120C has a superior output disable function Time to enable or disable is 50 ns and does not change markedly with temperature Furthermore in disable mode the output does not draw excessive currents when driven with 1000 V ms slew rates The output appears as a 3 pF load when disabled Applications Video gain block Residue amplifier Multiplexer Current to voltage converter Coax cable driver with gain of 2 ADC driver Simplified Schematic Ordering Information Part No Temp Range Package Outline EL2120CN 0 C to a 75 C EL2120CS 0 C to a 75 C 8-Pin P-DIP MDP0031 8-Lead SO MDP0027 Connection Diagrams P-DIP January 1996 Rev E 2120 - 1 SO 2120 - 21 2120 - 2 Top View 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 1991 Elantec Inc EL2120C 100 MHz Current Feedback Amplifier Absolute Maximum Ratings (TA e 25 C) Voltage between V a and Vb Voltage at a IN b IN VOUT Voltage between a IN and b IN Voltage at Disable Current into a IN b IN and Disable 33V (Vb) b 0 5V to (V a ) a 0 5V g5V (V a ) b 10V to (V a ) a 0 5V g5 mA Output Current Internal Power Dissipation Operating Ambient Temperature Range Operating Junction Temperature P-DIP or SO Storage Temperature Range g50 mA See Curves 0 to 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 VS e g5V RL e 150X TA e 25 C unless otherwise specified Parameter VOS DVOS DT IB a IBb CMRR b ICMR Description Input Offset Voltage VS e g15V Input Offset Drift a VIN Input Bias Current b VIN Input Bias Current Temp Full Full Full Full Full Full Full Full 25 C Full Full Full 25 C Min Typ 4 2 20 5 10 Max 20 25 Test Level II II V Units mV mV mV C mA mA dB mA V dB mA V mA V TD is 3 2in kX dB MX 15 50 II II II Common-Mode Rejection (Note 1) b Input Current Common-Mode Rejection (Note 1) 50 55 8 20 II II V PSRR a IPSR b IPSR Power Supply Rejection (Note 2) a Input Current Power Supply Rejection (Note 2) b Input Current Power Supply Rejection (Note 2) 65 80 0 03 06 5 II II II V ROL AVOL a RIN Transimpedance Voltage Gain a VIN Input Impedance 70 58 140 66 2 2 EL2120C 100 MHz Current Feedback Amplifier Open Loop DC Electrical Characteristics VS e g5V RL e 150X TA e 25 C unless otherwise specified Parameter VIN VO ISC IO DIS VDIS ON VDIS OFF IDIS ON IDIS OFF IS Description a VIN Range Contd Test Level II II II 50 II II (V a ) b 4 5 II II II 17 20 II Temp Full Full 25 C Full Full Full Full Full Full Min g3 0 g3 0 Typ g3 5 g3 5 Max Units V V mA mA V V mA mA mA TD is 2 7in TD is 2 4in Output Voltage Swing Output Short-Circuit Current Output Current Disabled Disable Pin Voltage for Output Enabled Disable Pin Voltage for Output Disabled Disable Pin Current for Output Enabled Disable Pin Current for Output Disabled Supply Current (VS e g15V) 100 5 (V a ) b 1 10 Note 1 The input is moved from b3V to a 3V Note 2 The supplies are moved from g5V to g15V Closed Loop AC Electrical Characteristics VS e g15V AV e a 2 (RF e RG e 270X) RL e 150X CL e 7 pF CINb e 2 pF TA e 25 C Parameter SR Description Slew Rate VOUT from b3V to a 3V Measured at b2V and a 2V VS e g15V VS e g5V Settling Time to 0 25% of a 0 to a 10V Swing AV e a 1 with RF e 270X RG e % and RL e 400X Bandwidth b 3 dB g1 dB g0 1 dB Min Typ Max Test Level Units 750 550 V V V ms V ms tS 50 95 50 16 75 35 11 05 V V V V V V V V ns MHz MHz MHz MHz MHz MHz dB BW BW 2 5V Bandwidth at VS e g2 5V b 3 dB g1 dB g0 1 dB Peaking 3 EL2120C 100 MHz Current Feedback Amplifier Closed Loop AC Electrical Characteristics Parameter dG Description Differential Gain DC Offset from b0 7V through a 0 7V AC Amplitude 286 mVp-p VS e g15V f e 3 58 MHz VS e g15V f e 30 MHz VS e g5V f e 3 58 MHz Differential Phase DC Offset from b0 7V through a 0 7V AC Amplitude 286 mVp-p VS e g15V f e 3 58 MHz VS e g15V f e 30 MHz VS e g5V f e 3 58 MHz Min Contd Test Level VS e g15V AV e a 2 (RF e RG e 270X) RL e 150X CL e 7 pF CINb e 2 pF TA e 25 C Typ Max Units k 0 01 01 0 01 V V V % % % di 0 01 01 0 06 V V V Typical Performance Curves AC Test Circuit 2120 - 3 Frequency Response vs RF Frequency Response vs Gain Frequency Response vs Load 2120 - 4 2120 - 5 2120 - 6 4 TD is 2 0in EL2120C 100 MHz Current Feedback Amplifier Typical Performance Curves Contd Gain Flatness vs RF Gain Flatness vs CIN b b 3 dB Bandwidth 0 1 dB Bandwidth and Peaking vs Temperature at VS g15V b 3 dB Bandwidth 0 1 dB Bandwidth and Peaking vs Temperature at VS g5V b 3 dB Bandwidth 0 1 dB Bandwidth and Peaking vs Supply Voltage Deviation From Linear Phase vs Frequency 2120 - 7 5 EL2120C 100 MHz Current Feedback Amplifier Typical Performance Curves Differential Gain vs DC Input Offset at 3 58 MHz Contd Differential Phase vs DC Input Offset at 3 58 MHz Differential Gain vs DC Input Offset at 30 MHz Differential Phase vs DC Input Offset at 30 MHz Differential Gain and Phase vs Supply Voltage (VIN DC from 0 to a 0 7V) Input Noise Voltage and Current 2120 - 8 6 EL2120C 100 MHz Current Feedback Amplifier Typical Performance Curves Undistorted Output Swing vs Frequency Contd Slew Rate vs Temperature 2120 - 9 Small-Signal Transient Response Large-Signal Transient Response AV e a 2 RF e RG e 270X RL e 150X 2120 - 10 AV e a 2 RF e RG e 270X RL e 150X VS e g15V Long Term Settling Error 2120 - 11 Settling Time vs Swing 2120 - 12 7 EL2120C 100 MHz Current Feedback Amplifier Typical Performance Curves Enable Response for a Family of Inputs Contd Disable Response for a Family of Inputs AV e a 2 RL e 150X VS e g5V 2120 - 13 AV e a 2 RL e 150X VS e g5V 2120 - 14 Supply Current vs Supply Voltage 8-Pin Plastic DIP Maximum Power Dissipation vs Ambient Temperature 8-Lead SO Maximum Power Dissipation vs Ambient Temperature 2120 - 15 8 EL2120C 100 MHz Current Feedback Amplifier Applications Information The EL2120C represents the third generation of current-feedback amplifier design It is designed to provide good high-frequency performance over wide supply voltage load impedance gain temperature and manufacturing lot variations It is a well-behaved amplifier in spite of its 100 MHz bandwidth but a few precautions should be taken to obtain maximum performance The power supply pins must be well bypassed 0 01 mF ceramic capacitors are adequate but lead length should be kept below and a ground plane is recommended Bypassing with 4 7 mF tantalum capacitors can improve settling characteristics and smaller capacitors in parallel will not be needed The lead length of sockets generally deteriorates the amplifier's frequency response by exaggerating peaking and increasing ringing in response to transients Short sockets cause little degradation Load capacitance also increases ringing and peaking Capacitance greater than 35 pF should be isolated with a series resistor Capacitance at the VIN b terminal has a similar effect and should be kept below 5 pF Often the inductance of the leads of a load capacitance will be self-resonant at frequencies from 40 MHz to 200 MHz and can cause oscillations A resonant load can be de-Q'ed with a small series or parallel resistor A ``snubber'' can sometimes be used to reduce resonances This is a resistor and capacitor in series connected from output to ground Values of 68X and 33 pF are typical Increasing the feedback resistor can also improve frequency flatness The VIN a pin can oscillate in the 200 MHz to 500 MHz realm if presented with a resonant or inductive source impedance A series 27X to 68X resistor right on the VIN a pin will suppress such oscillations without affecting frequency response b 3 dB bandwidth is inversely proportional to The greatest frequency response flatness (to 0 1 dB for instance) occurs with RF e 300X to 330X Even the moderate peaking caused by lower values of RF will cause the gain to peak out of the 0 1 dB window and higher values of RF will cause an overcompensated response where the gain falls below the 0 1 dB level Parasitic capacitances will generally degrade the frequency flatness The EL2120C should not output a continuous current above 50 mA as stated in the ABSOLUTE MAXIMUM RATINGS table The output current limit is set to 120 mA at a die temperature of 25 C and reduces to 85 mA at a die temperature of 150 C This large current is needed to slew load capacitance and drive low impedance loads with low distortion but cannot be supported continuously Furthermore package dissipation capabilities cannot be met under short-circuit conditions Current limit should not occur longer than a few seconds The output disable function of the EL2120C is optimized for video performance While in disable mode the feedthrough of the circuit can be modeled as a 0 2 pF capacitor from VIN a to the output No more than g5V can be placed between VIN a and VIN b in disable mode but this is compatible with common video signal levels In disabled state the output can withstand about 1000 V ms slew rate signals impressed on it without the output transistors turning on The Disable pin logic level is referred to V a With g5V supplies a CMOS or TTL driver with pull-up resistor will suffice g15V supplies require a a 14 a 11V drive span or a 15 a 10V nominally Open-collector TTL with a tapped pull-up resistor can provide these spans The impedance of the divider should be 1k or less for optimum enable disable speed The EL2120C enables in 50 ns or less When VIN e 0 only a small switching glitch occurs at the output When VIN is some other value the output overshoots by about 0 7V when settling toward its new enabled value the value of feedback resistor RF The EL2120C will tolerate values as low as 180X for a maximum bandwidth of about 140 MHz but peaking will increase and tolerance to stray capacitance will reduce At gains greater than 5 b 3 dB bandwidth begins to reduce and a smaller RF can be used to maximize frequency response 9 EL2120C 100 MHz Current Feedback Amplifier Applications Information Contd When the EL2120C disables it turns off very rapidly for inputs of g1V or less and the output sags more slowly for inputs larger than this For inputs as large as g2 5V the output current can be absorbed by another EL2120C simultaneously enabled Under these conditions switching will be properly completed in 50 ns or less The greater thermal resistance of the SO-8 package requires that the EL2120C be operated from g10V supplies or less to maintain the 150 C maximum die temperature over the commercial temperature range The P-DIP package allows the full g16 5V supply operation Typical Applications Circuit Dual EL2120C Multiplexer A High Quality Two-Input Multiplexer Channel-to-Channel Isolation of Dual EL2120C Multiplexer 2120 - 17 2120 - 16 Dual EL2120C Multiplexer Switching Channels Uncorrelated Sinewave Switched to a Family of DC Levels Dual EL2120C Multiplexer Switching Channels a Family of DC Levels Switched to an Uncorrelated Sinewave 2120 - 18 2120 - 19 10 EL2120C 100 MHz Current Feedback Amplifier The EL2120C Macromodel This macromodel has been developed to assist the user in simulating the EL2120C with surrounding circuitry It was developed for the PSPICE simulator (copywritten by the Microsim corporation) and may need to be rearranged for other simulators particularly the H operator It approximates frequency response and small-signal transients as well although the effects of load capacitance does not show This model is slightly more complicated than the models used for low-frequency op-amps but is much more accurate for AC The model does not simulate these characteristics accurately noise non-linearities slew rate limitations temperature effects settling time manufacturing variations input or output resonances CMRR and PSRR Revision A March 1992 Enhancements include PSRR CMRR and Slew Rate Limiting a input Connections b input l a Vsupply l l b Vsupply l l l output l l l l l subckt M2120 Input Stage e1 10 0 3 0 1 0 vis 10 9 0V h2 9 12 vxx 1 0 r1 2 11 25 l1 11 12 20nH iinp 3 0 10mA iinm 2 0 5mA r12 3 0 2Meg Slew Rate Limiting 3 l 2 l 7 l 4 l 6 q1 4 18 19 qp q2 7 18 20 qn q3 7 19 21 qn q4 4 20 22 qp r7 21 6 4 r8 22 6 4 ios1 7 19 2 5mA ios2 20 4 2 5mA Supply ips 7 4 10mA h1 13 0 vis 600 r2 13 14 1K d1 14 0 dclamp s2 0 14 dclamp High Frequency Pole e2 30 0 14 0 0 00166666666 15 30 17 1mH c5 17 0 0 5pF r5 17 0 600 Transimpedance Stage g1 0 18 17 0 1 0 rol 18 0 140K cdp 18 0 7 9pF Output Stage Error Terms ivos 0 23 5mA vxx 23 0 0V e4 24 0 6 0 1 0 e5 25 0 7 0 1 0 e6 26 0 4 0 1 0 r9 24 23 562 r10 25 23 10K r11 26 23 10K Models model qn npn (is e 5eb15 bf e 500 tf e 0 1nS) model qp pnp (is e 5eb15 bf e 500 tf e 0 1nS) model dclamp d(is e 1eb30 ibv e 0 02 bv e 4 n e 4) ends 11 TD is 3 8in TAB WIDE TD EL2120C EL2120C 100 MHz Current Feedback Amplifier The EL2120C Macromodel Contd 2120 - 20 EL2120 Macromodel 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 E 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 12 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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