EL2142C EL2142C Differential Line Receiver Features General Description # # # # # # The EL2142C is a very high bandwidth amplifier designed to extract the difference signal from noisy environments, and is thus primarily targeted for applications such as receiving signals from twisted pair lines, or any application where common mode noise injection is likely to occur. Differential input range g 2.3V 150 MHz 3 dB bandwidth 400 V/ms slewrate g 5V supplies or single supply 50 mA minimum output current Output swing (100X load) to within 1.5V of supplies # Low power b 11 mA typical Applications # # # # # Twisted pair receiver Differential line receiver VGA over twisted pair ADSL/HDSL receiver Differential to single ended amplification. # Reception of analog signals in a noisy environment. The EL2142C is stable for a gain of one, and requires two external resistors to set the voltage gain. 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 output can deliver a minimum of g 50 mA and is short circuit protected to withstand a temporary overload condition. Connection Diagrams EL2142C SO, P-DIP Ordering Information Part No. Temp. Range Package EL2142CN b 40§ C to a 85§ C 8-pin DIP EL2142CS Outline Ý MDP0031 b 40§ C to a 85§ C 8-pin SOIC MDP0027 2142-1 January 1996 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. © 1996 Elantec, Inc. EL2142C Differential Line Receiver Absolute Maximum Ratings (TA e 25§ C) Supply Voltage (VCC – VEE) Maximum Output Current Storage Temperature Range 0V to 12.6V g 60 mA b 65§ C to a 150§ C a 150§ C a 300§ C b 40§ C to a 85§ C Operating Junction Temperature Lead Temperature ( k5 sec) Recommended Operating Temperature 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 b 5V, TA e 25C, VIN e 0V, RL e 100, unless otherwise specified) Description Min Typ Max Test Level g 3.0 g 5.0 g 6.3 I V 11 14 I mA mV Units Vsupply Supply Operating Range (VCC – VEE) IS Power Supply Current (no load) VOS Input Referred Offset Voltage b 25 10 40 I IIN Input Bias Current (VIN, VINB, VREF) b 20 6 20 I mA ZIN Differential Input Resistance 400 V KX CIN Differential Input Capacitance pF VDIFF Differential Input Range AVOL Open Loop Voltage Gain VIN Input Common Mode Voltage Range b 2.6 VOUT Output Voltage Swing (50X load to GND) g 2.9 g 3.1 I V IOUT(min) Minimum Output Current 50 60 I mA VN Input Referred Voltage Noise V nV/ SHz VREF Output Voltage Control Range I V PSRR Power Supply Rejection Ratio 60 70 I dB CMRR2 Input Common Mode Rejection Ratio (VIN e g 2V) 60 70 I dB CMRR1 Input Common Mode Rejection Ratio (full VIN range) 50 60 I dB g 2.0 1 V g 2.3 I V 75 V dB I V a 4.0 36 b 2.5 2 a 3.3 TD is 3.3in Parameter EL2142C Differential Line Receiver AC Electrical Characteristics Parameter Description BW(b3dB) Min Typ Max Test Level Units b 3 dB Bandwidth (Gain e 1) 150 V MHz SR Slewrate 400 V V/ms Tstl Settling time to 1% 15 V ns GBWP Gain bandwidth product 200 V MHz VREFBW(b3 dB) VREF b3dB Bandwidth 130 V MHz VREFSR VREF Slewrate 100 V V/msec % dG Differential gain at 3.58 MHz. 0.2 V di Differential phase at 3.58 MHz. 0.2 V Pin Description Pin Number Pin Name Function 1 VFB Feedback input 2 VIN Non-inverting input 3 VINB Inverting input 4 VREF Sets output voltage level to VREF when VIN e VINB 5 NC 6 VCC Positive supply voltage 7 VEE Negative supply voltage 8 VOUT Output voltage 3 TD is 1.8in (VCC e a 5V, VEE e b 5V, TA e 25C, VIN e 0V, RLOAD e 100, unless otherwise specified) EL2142C Differential Line Receiver Typical Performance Curves Frequency Response (Gain e 1) IS vs Supply Voltage 2142 – 2 2142 – 3 Frequency Response vs Resistor R1 (Gain e 4) CMRR vs Frequency 2142 – 4 2142 – 5 Distortion vs Frequency (GAIN e 3, RLOAD e 100X) VIN e 2V pk/pk VREF Frequency Response 2142 – 6 2142 – 7 4 EL2142C Differential Line Receiver Applications Information 2142-8 Gain Equation VOUT e ((R2 a R1)/R1) c (VIN-VINB a VREF) when R1 tied to GND VOUT e ((R2 a R1)/R1) c (VIN-VINB) when R1 tied to VREF Choice of Feedback Resistor Capacitance Considerations For a gain of one, VOUT may be shorted back to VFB, but 100X – 200X improves the bandwidth. For gains greater than one, there is little to be gained from choosing resistor R1 value below 200X, for it would only result in increased power dissipation and potential signal distortion. Above 200X, the bandwidth response will develop some peaking (for a gain of one), but substantially higher R1 values may be used for higher voltage gains, such as up to 1 kX at a gain of four before peaking will develop. As with many high bandwidth amplifiers, the EL2142C prefers not to drive highly capacitive loads. It is best if the capacitance on VOUT is kept below 10 pF if the user does not want gain peaking to develop. The VFB node forms a potential pole in the feedback loop, so capacitance should be minimized on this node for maximum bandwidth. 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. 5 EL2142C Differential Line Receiver Typical Applications 2142-9 Figure 1. Typical Twisted Pair Application 2142-10 Figure 2. Coaxial Cable Driver 6 EL2142C Differential Line Receiver Typical Applications Ð Contd. 2142-11 Figure 3. Single Supply Receiver 2142-12 2142-13 Figure 4. Compensated Line Receiver 7 EL2142C EL2142C Differential Line Receiver 2142-14 Figure 5. Two Channel Multiplexer 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 A 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.