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general description the ssm-2120 is a monolithic integrated circuit designed for the purpose of processing dynamic signals in various analog sys- tems including audio. this dynamic range processor consists of two vcas and two level detectors (the ssm-2122 consists of two vcas only). these circuit blocks allow the user to logarith- mically control the gain or attenuation of the signals presented to the level detectors depending on their magnitudes. this al- lows the compression, expansion or limiting of ac signals, some of the primary applications for the ssm-2120. precision monolithics inc. ? ? ssm-2120/ssm-2122 dynamic range processor/dual vca ? features ? 0.01% thd at +10dbv in/out ? 100db vca dynamic range ? low vca control feedthrough ? 100db level detection range ? log/antilog control paths ? low external component count the ssm-2120/ssm-2122 is mask work protected under the semiconductor chip protection act of 1983. applications ? compressors ? expanders ? limiters ? agc circuits ? voltage-controlled filters ? noise reduction systems ? stereo noise gates C10 c to +50 c operating temperature range ordering information package ssm2120p plastic 22-pin ssm2122p plastic 16-pin simplified schematic (vca section only) pin connections 1 2 3 4 21 22 thresh 1 gnd log av 1 v+ con out 1 sig out 2 sig out 1 +v c2 5 20 +v c1 cft 2 6 19 cft 1 Cv c2 7 18 Cv c1 sig in 2 8 17 sig in 1 rec in 2 9 16 rec in 1 con out 2 10 15 i ref log av 2 11 14 vC thresh 2 12 13 1 2 3 413 14 15 16 gnd gnd sig out 1 v+ +v c1 sig out 2 cft 1 +v c2 51 2 Cv c1 cft 2 61 1 sig in 1 Cv c2 7 i ref sig in 2 89 vC gnd 10 ssm-2122 16-pin plastic dip (p-suffix) ssm-2120 22-pin plastic dip (p-suffix) 5/90, rev. b1 + C v+ +v c Cv c vC current mirrors v+ 36kw 36kw signal out signal input i ref v+ v+ obsolete
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precision monolithics inc. reserves the right to make changes leading to improved performance, reliability or manufacturability. although every effort is made to ensure accuracy of the information contained on this data sheet, pmi assumes no responsibility for circuitry unless entirely contained within a pmi product. the premium performance of this product is achieved through an advanced processing technology. all pmi products are guaranteed to meet or exceed published specifications. ? pmi 1990 5/90, rev. b1 0590 0299g7m printed in usa precision monolithics inc. a bourns company 1500 space park dr. santa clara, ca twx 310-371-9541 tel 800 843-1515 p.o. box 58020 95052-8020 fax 408 727-1550 fader automation the ssm-2120 can be used in fader automation systems to serve two channels. the inverting control port is connected through an attenuator to the vca control voltage source. the noninverting control port is connected to a control circuit (such as figure 6) which senses the input signal level to the vca. above the thresh- old voltage, which can be set quite low (for example e60dbv), the vca operates at its programmed gain. below this threshold the vca will downward expand at a rate determined by the +v c control port attenuator. by keeping the release time constant in the 10 to 25ms range, the modulation of the vca standing noise floor (e80db at unity-gain), can be kept inaudibly low. the ssm-2300 8-channel multiplexed sample-and-hold ic makes an excellent controller for vcas in automation systems. figure 16 shows the basic connection for the ssm-2122 operat- ssm-2120/ssm-2122 dynamic range processor/dual vca

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