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| EL2140C 2141C EL2140C 2141C 150 MHz Differential Twisted Pair Driver Features Fully differential inputs outputs and feedback Differential input range g2 3V 150 MHz 3 dB bandwidth 800 V ms slew rate b 55 dB distortion at 3 MHz b 75 dB distortion at 100 kHz g5V supplies or a 6V single supply 50 mA minimum output current Output swing (200X load) to within 1 5V of supplies (14V pk-pk differential) Low power-11 mA typical supply current General Description The EL2140C 2141C is a very high bandwidth amplifier whose output is in differential form and is thus primarily targeted for applications such as driving twisted pair lines or any application where common mode injection is likely to occur The input signal can be in either single-ended or differential form but the output is always in differential form On the EL2141C two feedback inputs provide the user with the ability to set the device gain (stable at minimum gain of two) whereas the EL2140C comes with a fixed gain of two The output common mode level is set by the reference pin (VREF) which has a b 3 dB bandwidth of over 100 MHz Generally this pin is grounded but it can be tied to any voltage reference The transmission of ADSL HDSL signals requires very low distortion amplification so this amplifier was designed with this as a primary goal The actual signal distortion levels depend upon input and output signal amplitude as well as the output load impedance (See distortion data inside ) Both outputs (VOUT VOUTB) are short circuit protected to withstand temporary overload condition Applications Twisted pair driver Differential line driver VGA over twisted pair ADSL HDSL driver Single ended to differential amplification Transmission of analog signals in a noisy environment Connection Diagrams EL2140C EL2141C Ordering Information Part No Temp Range Package Outline EL2140CN b 40 C to a 85 C 8-pin PDIP MDP0031 EL2140CS b 40 C to a 85 C 8-pin SOIC MDP0027 EL2141CN b 40 C to a 85 C 8-pin PDIP MDP0031 EL2141CS b 40 C to a 85 C 8-pin SOIC MDP0027 2140-1 2140-2 October 1995 Rev A 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 1995 Elantec Inc EL2140C 2141C 150 MHz Differential Twisted Pair Driver TD is 0 3in TD is 3 7in Absolute Maximum Ratings Supply Voltage (VCC - VEE) Maximum Output Current Storage Temperature Range Operating Junction Temperaure 0V - 12 6V g60 mA b 65 C to a 150 C a 150 C b 40 C to 85 C Recommended Operating Temperature VIN VINB VREF VEE a 0 8V (MIN) to VCCb0 8V (MAX) g5V VIN -VINB 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 VCC e a 5V VEE e b5V TA e 25 C VIN e 0V RL e 200 unless otherwise specified Parameter Vsupply IS VOS IIN ZIN VDIFF AV AVOL VCM VOUT(200) VOUT(100) VN VREF VREFOS PSRR IOUT(min) CMRR ROUT Description Supply Operating Range (VCC - VEE) Power Supply Current (No Load) Input Referred Offset Voltage Input Bias Current (VIN VINB VREF) Differential Input Impedance Differential Input Range Voltage Gain (EL2140C) VIN e 2V pk-pk Open Loop Voltage Gain (EL2141C) Input Common Mode Voltage Range (EL2140C) Output Voltage Swing (200X load VOUT to VOUTB) (EL2141C) Output Voltage Swing (100X Load VOUT to VOUTB) (EL2141C) Input Referred Voltage Noise Output Voltage Control Range (EL2140C) Output Offset Relative to VREF Power Supply Rejection Ratio Minimum Output Current Input Common Mode Rejection Ratio (EL2140C) VCM e g 2V (VOUT e VOUTB e 0V) Output Impedence b2 5 b 60 b 25 b2 6 g3 4 g2 9 g3 6 g3 1 g2 0 Min g3 0 Typ g5 0 Max g6 3 Test Level I I I I V I Units V mA mV mA kX V VV dB V V V nV 11 b 25 b 20 14 40 20 10 6 400 g2 3 1 95 1 985 75 2 02 I V a4 0 I I I V 36 a3 3 a 60 SHz V I I I I I V mV dB mA dB X 60 50 60 70 60 70 01 2 EL2140C 2141C 150 MHz Differential Twisted Pair Driver AC Electrical Characteristics VCC e a 5V VEE e b5V TA e 25 C VIN e 0V RLOAD e 200 unless otherwise specified Parameter BW(b3 dB) SR Tstl GBW VREFBW(b3 dB) VREFSR THDf1 dP dG Description b 3 dB Bandwidth (EL2140C and EL2141C Min gain of 2) Typ 150 800 15 400 130 100 b 75 Max Test Level V V V V V V V V V Units MHz V ms ns MHz MHz V ms TD is 2 0in dB Differential Slewrate Settling Time to 1% Gain Bandwidth Product VREF b3 dB Bandwidth VREF Slewrate Distortion at 100 kHz (Note 1) Differential Phase Differential Gain 3 58 MHz 3 58 MHz 0 16 0 24 % Note 1 Distortion measurement quoted for VOUT -VOUTB e 12V pk-pk RLOAD e 200X Vgain e 8 Pin Description Pin No EL2140C EL2141C 1 3 1 4 4 5 6 7 8 3 5 6 7 8 2 Pin Name VIN VINB FBP FBN VREF VOUTB VCC VEE VOUT Non-inverting Input Inverting Input (EL2140C only) Non-inverting Feedback Input Resistor R1 must be Connected from this Pin to VOUT (EL2141C only) Inverting Feedback Input Resistor R3 must be Connected from this pin to VOUTB (EL2141C only) Output Common-mode Control The Common-mode Voltage of VOUT and VOUTB will Follow the Voltage on this Pin Note that on the EL2141 this pin is also the VINB pin Inverting Output Positive Supply Negative Supply Non-inverting Output Function 3 EL2140C 2141C 150 MHz Differential Twisted Pair Driver Typical Performance Curves IS vs Supply Voltage EL2140 Frequency Response 2140-3 2140-4 EL2141 Frequency Response vs Resistor R2 (GAIN e 2) Frequency Response vs Temperature 2140-5 2140-6 EL2141 Frequency Response vs Resistor R2 (GAIN e 8) EL2141 Distortion vs Frequency (GAIN e 6 RLOAD e 200X) VIN e 2V pk pk 2140-7 2140-8 4 EL2140C 2141C 150 MHz Differential Twisted Pair Driver Typical Performance Curves EL2140 CMRR vs Frequency Contd EL2141 Output Signal and Common Mode Signal vs Frequency 2140-9 2140-10 EL2140 VREF Frequency Response 2140-11 2140-12 EL2140 Small Signal Response (Note 1) Note 1 Photo shows voltages on a 100X transmission line terminated at both ends so voltages at VOUT VOUTB are twice the values shown 5 EL2140C 2141C 150 MHz Differential Twisted Pair Driver Applications Information EL2141C EL2140C 2140-14 GAIN e 2 2140-13 VOUT a VOUTB e VREF 2 (common mode) GAIN e R1 a R2 a R3 R2 The amount of capacitance tolerated on any of these nodes in an actual application will also be dependent on the gain setting and the resistor values in the feedback network Choice of feedback resistor There is little to be gained from choosing resistor R2 values below 400X and in fact it would only result in increased power dissipation and signal distortion Above 400X the bandwidth response will develop some peaking (for a gain of two) but substantially higher resistor R2 values may be used for higher voltage gains such as up to 2 kX at a gain of eight before peaking will develop R1 and R3 are selected as needed to set the voltage gain and while R1 e R3 is suggested the gain equation above holds for any values (see distortion for further suggestions) Distortion considerations The harmonics that these amplifiers will potentially produce are the 2nd 3rd 5th and 6th Their amplitude is application dependent All other harmonics should be negligible by comparison Each should be considered separately H2 The second harmonic arises from the input stage and the lower the applied differential signal amplitude the lower the magnitude of the second harmonic For practical considerations of required output signal and input noise levels the user will end up choosing a circuit gain Referring to Figure 1 it is best if the voltage at the negative feedback node tracks the VREF node and the voltage at the positive feedback node tracks the VIN node respectively This would theoretically require that R1 a R2 e R3 although the lowest distortion is found at about R3 e R1 a (0 7 R2) With this arrangement the second harmonic should be suppressed well below the value of the third harmonic 6 Capacitance considerations As with many high bandwidth amplifiers the EL2140C 2141C prefer not to drive highly capacitive loads It is best if the capacitance on VOUT and VOUTB is kept below 10 pF if the user does not want gain peaking to develop In addition on the EL2141C the two feedback nodes FBP and FBN should be laid out so as to minimize stray capacitance else an additional pole will potentially develop in the response with possible gain peaking EL2140C 2141C 150 MHz Differential Twisted Pair Driver Applications Information Contd H3 The third harmonic should be the dominant harmonic and is primarily affected by output load current which of course is unavoidable However this should encourage the user not to waste current in the gain setting resistors and to use values that consume only a small proportion of the load current so long as peaking does not occur The more load current the worse the distortion but depending on the frequency it may be possible to reduce the amplifier gain so that there is more internal gain left to cancel out any distortion H5 The fifth harmonic should always be below the third and will not become significant until heavy load currents are drawn Generally it should respond to the same efforts applied to reducing the third harmonic H6 The sixth harmonic should not be a problem and is the result of poor power supply decoupling While 100 nF chip capacitors may be sufficient for some applications it would be insufficient for driving full signal swings into a twisted pair line at 100 kHz Under these conditions the addition of 4 7 mF tantalum capacitors would cure the problem Typical Applications Circuits 2140-15 Figure 1 Typical Twisted Pair Application 7 EL2140C 2141C 150 MHz Differential Twisted Pair Driver Typical Applications Circuits Contd 2140-16 Figure 2 Dual Coaxial Cable Driver 2140-17 Figure 3 Single Supply Twisted Pair Driver 8 EL2140C 2141C 150 MHz Differential Twisted Pair Driver Typical Applications Circuits Contd 2140-18 Figure 4 Differential Line Driver with Equalization DC Gain e R1 a R2 a R3 (See Figure 5) R2 R1 a (R2 R4) a R3 (See Figure 5) (R2 R4) HF Gain e 2140-19 Figure 5 where fo e 1 2 q C 1 R2 and fp e 1 2 q C 1 R4 9 EL2140C 2141C 150 MHz Differential Twisted Pair Driver Typical Applications Circuits Contd 2140-20 Figure 6 Dual Signal Transmission Circuit 10 BLANK 11 EL2140C 2141C EL2140C 2141C 150 MHz Differential Twisted Pair Driver 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 October 1995 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 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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