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LM194H/883 Datasheet(PDF) 1 Page - National Semiconductor (TI) |
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LM194H/883 Datasheet(HTML) 1 Page - National Semiconductor (TI) |
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1 / 10 page  TLH9241 December 1994 LM194LM394 Supermatch Pair General Description The LM194 and LM394 are junction isolated ultra well- matched monolithic NPN transistor pairs with an order of magnitude improvement in matching over conventional tran- sistor pairs This was accomplished by advanced linear pro- cessing and a unique new device structure Electrical characteristics of these devices such as drift ver- sus initial offset voltage noise and the exponential relation- ship of base-emitter voltage to collector current closely ap- proach those of a theoretical transistor Extrinsic emitter and base resistances are much lower than presently avail- able pairs either monolithic or discrete giving extremely low noise and theoretical operation over a wide current range Most parameters are guaranteed over a current range of 1 mA to 1 mA and 0V up to 40V collector-base voltage ensuring superior performance in nearly all applications To guarantee long term stability of matching parameters internal clamp diodes have been added across the emitter- base junction of each transistor These prevent degradation due to reverse biased emitter currentthe most common cause of field failures in matched devices The parasitic iso- lation junction formed by the diodes also clamps the sub- strate region to the most negative emitter to ensure com- plete isolation between devices The LM194 and LM394 will provide a considerable improve- ment in performance in most applications requiring a closely matched transistor pair In many cases trimming can be eliminated entirely improving reliability and decreasing costs Additionally the low noise and high gain make this device attractive even where matching is not critical The LM194 and LM394LM394BLM394C are available in an isolated header 6-lead TO-5 metal can package The LM394LM394BLM394C are available in an 8-pin plastic dual-in-line package The LM194 is identical to the LM394 except for tighter electrical specifications and wider temper- ature range Features Y Emitter-base voltage matched to 50 mV Y Offset voltage drift less than 01 mV C Y Current gain (hFE) matched to 2% Y Common-mode rejection ratio greater than 120 dB Y Parameters guaranteed over 1 mA to 1 mA collector current Y Extremely low noise Y Superior logging characteristics compared to conventional pairs Y Plug-in replacement for presently available devices Typical Applications Low Cost Accurate Square Root Circuit IOUT e 10 b 5 010 VIN TLH9241 – 1 Low Cost Accurate Squaring Circuit IOUT e 10 b 6 (VIN)2 TLH9241 – 2 Trim for full scale accuracy C1995 National Semiconductor Corporation RRD-B30M115Printed in U S A |
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