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| ELH0033G 883 8001401ZX ELH0033G 883 8001401ZX Fast Buffer Amplifier Features Slew rate 1500 V ms Output drive 100 mA Rise and fall times 2 9 ns Input resistance 1011X Power bandwidth 100 MHz MIL-STD-883 devices 100% manufactured in U S A General Description The ELH0033 is a high-speed FET input voltage follower buffer designed to provide high output currents from DC to over 100 MHz The ELH0033 slews at 1500 V ms and will drive 100X loads Phase linearity is excellent to 20 MHz allowing the buffer to be included in op amp loops The ELH0033 is intended to fulfill a wide range of buffer applications such as high-speed line drivers video impedance transformation nuclear instrumentation amplifiers op amp isolation buffers for driving reactive loads and high impedance input buffers for high-speed A to D's and comparators These devices are constructed using specially selected junction FETs and active laser trimming to achieve guaranteed performance specifications The ELH0033 is specified for operation from b 55 C to a 125 C Elantec facilities comply with MIL-I-45208A and other applicable quality specifications Elantec's Military devices are 100% fabricated and assembled in our rigidly controlled ultra-clean facilities in Milpitas California For additional information on Elantec's Quality and Reliability Assurance policy and procedures request brochure QRA-1 Advantages Excellent phase linearity Driver cables and other capacitive loads Wide supply range single or split Ordering Information Part No Temp Range Package Outline TO-8 MDP0002 ELH0033G 883B b 55 C to a 125 C 8001401ZX is the SMD version of this device Connection Diagram 12-Pin TO-8 Equivalent Schematic 0033 - 1 Top View Note Case is electrically isolated July 1992 Rev H 0033 - 2 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 Patent pending 1989 Elantec Inc ELH0033G 883 8001401ZX Fast Buffer Amplifier Absolute Maximum Ratings VS VIN PD IOC IOP Supply Voltage (V a b Vb) Input Voltage Power Dissipation (See Curves) Continuous Output Current Peak Output Current 40V 40V 1 5W g100 mA g250 mA TA TJ TST Operating Temperature Range ELH0033 Operating Junction Temperature Storage Temperature Lead Temperature (Soldering 10 seconds) b 55 C to a 125 C 175 C b 65 C to a 150 C 300 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 DC Electrical Characteristics VS e g15V Parameter VOS Description Output Offset Voltage Average Temperature Coefficient of Offset Voltage Input Bias Current VIN e 0V TMIN s TA s TMAX ELH0033 Test Level I I V 250 25 10 0 97 1010 1010 0 98 1011 1011 6 g12 Test Conditions RS s 100 kX TJ e 25 C (Note 1) RS s 100 kX Min Typ 5 Max 10 15 Units mV mV mV C pA nA nA VV X X X V TD is 3 4in V mA mW DVOS DT RS e 100X TJ e 25 C (Note 1) TA e 25 C (Note 2) TJ e TA e TMAX 50 IB I IV I I IV I AV RIN Voltage Gain Input Impedance RS e 100X RL e 1 kX VIN e g10V RL e 1 kX TJ e 25 C (Note 1) RL e 1 kX 1 00 RO VO Output Impedance Output Voltage Swing RL e 1 kX VIN e g1V VIN e g14V RL e 1 kX VIN e g10 5V RL e 100X TA e 25 C 10 I I I g9 IS Supply Current Power Consumption 14 5 20 600 22 660 I I Note 1 Specification is at 25 C junction temperature due to requirements of high-speed automatic testing Actual values at operating temperature will exceed the value at TJ e 25 C When supply voltages are g15V no-load operating junction temperature may rise 40 C- 60 C above ambient and more under load conditions Accordingly VOS may change one to several mV and IB will change significantly during warm-up Refer to IB vs temperature graph for expected values Note 2 Measured in still air 7 minutes after application of power 2 ELH0033G 883 8001401ZX Fast Buffer Amplifier AC Electrical Characteristics TC e 25 C Parameter SR BW Description Slew Rate Bandwidth Phase Non-Linearity tr tp HD AV Rise Time Propagation Delay Harmonic Distortion Voltage Gain VS e g15V RS e 50X RL e 1 kX ELH0033 Test Conditions VIN e g10V VIN e 1 Vrms BW e 1 MHz to 20 MHz DVIN e 0 5V DVIN e 0 5V f l 1 kHz RS e 100X VIN e 1 Vrms f e 1 kHz VIN e 1 Vrms f e 1 kHz 0 97 Min 1000 Typ 1500 100 2 29 12 k0 1 Max Test Level III V V V V V Units V ms MHz ns ns % VV RO Output Impedance 6 10 I X Typical Performance Curves Maximum Power Dissipation Supply Current vs Supply Voltage Output Voltage vs Supply Voltage Negative Pulse Response Positive Pulse Response Frequency Response 0033 - 3 3 TD is 2 3in 0 98 1 00 I ELH0033G 883 8001401ZX Fast Buffer Amplifier Typical Performance Curves Rise and Fall Time vs Temperature Contd Input Bias Current vs Temperature Normalized Input Bias Current During Warm-up Input Bias Current vs Input Voltage 0033 - 4 Typical Applications Offset Zero Adjust Using Resistor Current Limiting Current Limiting Using Current Sources 0033 - 5 0033 - 6 0033 - 7 4 ELH0033G 883 8001401ZX Fast Buffer Amplifier Typical Applications Contd Coaxial Cable Driver High Input Impedance AC Coupled Amplifier fH t 100 MHz Select C1 for optimum pulse response 0033 - 8 0033 - 9 Instrumentation Shield Line Driver 0033 - 10 Single Supply AC Amplifier 4 5 MHz Notch Filter 0033 - 11 1 2qR1C1 R1 e 2 R2 C2 C1 e 2 FO e 0033 - 12 High-Speed Sample and Hold Polycarbon or teflon 0033 - 13 5 ELH0033G 883 8001401ZX Fast Buffer Amplifier Applications Information Recommended Layout Precautions RF video printed circuit board layout rules should be followed when using the ELH0033 since it will provide power gain to frequencies over 100 MHz Ground planes are recommended and power supplies should be decoupled at each device with low inductance capacitors In addition ground plane shielding may be extended to the metal case of the device since it is electrically isolated from internal circuitry Alternatively the case should be connected to the output to minimize input capacitance Short Circuit Protection In order to optimize transient response and output swing output current limit has been omitted from the ELH0033 Short circuit protection may be added by inserting appropriate value resistors between V a and VC a pins and V b and VC b pins Resistor values may be predicted by RLIM j Va Vb e ISC ISC where ISC s 100 mA for ELH0033 The inclusion of limiting resistors in the collectors of the output transistors reduces output voltage swing Decoupling VC a and VC b pins with capacitors to ground will retain full output swing for transient pulses An alternate active current limit technique that retains full DC output swing uses current sources which are saturated during normal operation thus applying full supply voltage to the VC pins Under fault conditions the voltage decreases as required by the overload RLIM j VBE 0 6V e e 10X ISC 60 mA Offset Voltage Adjustment The ELH0033's offset voltages have been actively trimmed by laser to meet guaranteed specifications when the offset preset pin is shorted to the offset adjust pin The pre-calibration allows the devices to be used in most DC or AC applications without individually offset nulling each device If offset null is desirable it is simply obtained by leaving the offset preset pin open and connecting a trim pot of 100X between the offset adjust pin and V b Operation from Single or Asymmetrical Power Supplies This device type may be readily used in applications where symmetrical supplies are unavailable or not desirable A typical application might be an interface to a MOS shift register where V a e a 5V and V b e b 12V In this case an apparent output offset occurs due to the device's voltage gain of less than unity This additional output offset error may be predicted by DVO j (1 b AV) (V a b V b ) e 0 005 (V a b V b ) 2 Capacitive Loading The ELH0033 is designed to drive capacitive loads such as coaxial cables in excess of several thousand picofarads without susceptibility to oscillation However peak current resulting from (C c dv dt) should be limited below absolute maximum peak current ratings for the devices Thus DVIN c CL s IOUT s g250 mA Dt In addition power dissipation resulting from driving capacitive loads plus standby power should be kept below the total package power rating PD pkg t PDC a PAC PD pkg t (V a b V b ) c IS a PAC PAC j (VP-P)2 c f c CL where AV e No load voltage gain typically 0 99 V a e Positive supply voltage V b e Negative supply voltage For the above example DVO would be b 35 mV This may be adjusted to zero as described in Section 2 For AC coupled applications no additional offset occurs if the DC input is properly biased as illustrated in the ``typical applications'' section 6 ELH0033G 883 8001401ZX Fast Buffer Amplifier where VP-P e Peak-to-peak output voltage swing e Frequency f CL e Load Capacitance Hardware In order to utilize the full drive capabilities of the ELH0033 it should be mounted with a heatsink particularly for extended temperature operation The case is isolated from the circuit and may be connected to system chassis Operation within an Op Amp Loop Both devices may be used as a current booster or isolation buffer within a closed loop with op amps such as the ELH0032 and HA2500 and HA2600 series An isolation resistor of 47X should be used between the op amp output and the input of ELH0033 The wide bandwidth and high slew rates of the ELH0033 assure that the loop has the characteristics of the op amp and that additional rolloff is not required IMPORTANT Power supply bypassing is necessary to prevent oscillation with the ELH0033 in all circuits Low inductance ceramic disc capacitors with the shortest practical lead lengths must be connected from each supply lead (within to of the device package) to a ground plane Capacitors should be one or two 0 1mF in parallel adding a 4 7 mF solid tantalum capacitor will help in troublesome instances Burn-In Circuit 0033 - 14 7 ELH0033G 883 8001401ZX Fast Buffer Amplifier ELH0033 Macromodel Connections input TAB WIDE l l l l l l Va l l l l l Vc a l l l l Vb l l l Vcb l l output l subckt M0033 5 12 1 10 9 11 Models model qn npn (is e 5eb14 bf e 150 vaf e 100 re e 1 rb e 5 re e 1 ikf e 200mA a cje e 5pF cjc e 5pF mje e 42 mjc e 23 tf e 3nS tr e 200nS br e 5 vtf e 0) model qp pnp (is e 5eb14 bf e 150 vaf e 100 rc e 2 rb e 3 re e 1 ikf e 100mA a cje e 5 7pF cjc e 4pF tf e 3nS mje e 32 mjc e 43 tr e 170nS br e 5 vtf e 0) model qf njf (vto eb3V beta e 4 0eb3 cgd e 4pF cgs e 10pF lambda e 671 0eb6) Resistors r1 20 21 58 33 r2 27 10 58 33 r3 22 11 2 r4 11 23 2 Transistors j1 12 5 20 qf j4 24 10 26 qf q2 21 21 25 qn q3 24 24 25 qp q5 1 21 22 qn q6 9 24 23 qp q7 26 26 27 qn ends 8 TD is 3 8in ELH0033G 883 8001401ZX Fast Buffer Amplifier ELH0033 Macromodel Contd 0033 - 16 9 BLANK 10 BLANK 11 ELH0033G 883 8001401ZX ELH0033G 883 8001401ZX Fast Buffer Amplifier 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 July 1992 Rev H 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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