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EL4430 Datasheet(PDF) 9 Page - Elantec Semiconductor |
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EL4430 Datasheet(HTML) 9 Page - Elantec Semiconductor |
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9 / 12 page  EL4430CEL4431C Video Instrumentation Amplifiers Applications Information Contd Power Supplies The instrumentation amplifiers work well on any supplies from g3V to g15 The supplies may be of different voltages as long as the requirements of the Gnd pin are observed ( see the Ground Pin section for a discussion) The supplies should be bypassed close to the device with short leads 47 mF tantalum capacitors are very good and no smaller bypasses need be placed in parallel Ca- pacitors as low as 001 mF can be used if small load currents flow Single-polarity supplies such as a12V with a 5V can be used where the ground pin is con- nected to a5V and V- to ground The inputs and outputs will have to have their levels shifted above ground to accommodate the lack of nega- tive supply The dissipation of the amplifiers increases with power supply voltage and this must be compati- ble with the package chosen This is a close esti- mate for the dissipation of a circuit PDe 2 c VS c IS max a (VSbVO) c VO RPAR where IS max is the maximum supply current VS is the g supply voltage (assumed equal) VO is the output voltage RPAR is the parallel of all resistors loading the output For instance the EL4431 draws a maximum of 16 mA and we might require a 2V peak output into 150 X and a 270X a 270X feedback divider The RPAR is 117X The dissipation with g5V supplies is 201 mW The maximum supply volt- age that the device can run on for a given PD and the other parameter is VS max e (PD a VO2RPAR) (2IS a VO RPAR) The maximum dissipation a package can offer is PD max e (TJ max b TA max) iJA where TJ max is the maximum die junction temperature 150 C for reliability less to retain optimum electrical performance TA max is the ambient temperature 70 C for commercial and 85 C for industrial range iJA is the thermal resistance of the mounted package obtained from data- sheet dissipation curves The more difficult case is the SO-8 package With a maximum die temperature of 150 C and a maxi- mum ambient temperature of 85 C the 65 C tem- perature rise and package thermal resistance of 170 CW gives a dissipation of 382 mW at 85 C This allows a maximum supply voltage of g85V for the EL4431 operated in our example If an EL4430 were driving a light load (RPAR x%) it could operate on g15V supplies at a 70 C max- imum ambient Output Loading The output stage of the instrumentation amplifi- ers is very powerful It typically can source 80 mA and sink 120 mA Of course this is too much current to sustain and the part will eventu- ally be destroyed by excessive dissipation or by metal traces on the die opening The metal traces are completely reliable while delivering the 30 mA continuous output given in the Absolute Maximum Ratings table in this datasheet or higher purely transient currents Gain or gain accuracy degrades only 10% from no load to 100 X load Heavy resistive loading will degrade frequency response and video distortion for loads k100 X Capacitive loads will cause peaking in the fre- quency response If capacitive loads must be driv- en a small-valued series resistor can be used to isolate it (12 X to 51X should suffice) A 22X se- ries resistor will limit peaking to 25 dB with even a 220 pF load 9 |
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