issue 2 - october 2007 1 www.zetex.com ? zetex semiconductors plc 2007 zxcd1210 high performance analog input class d modulator description the zxcd1210 provides complete control and modulation functions at the heart of high efficiency high performance class d switching audio amplifier solutions. in combination with high performance output stages and open or closed loop architectures, the zxcd1210 provides a high performance audio amplifier with all the inherent benefits of class d. the zxcd1210 solution uses proprietary circuit design to realise the true benefits of class d without the traditional drawback of poor distortion performance. the combination of reference circuit designs, magnetic component choice and layout are essential to realising these benefits. features ? output power 50w to 500w into 4 thd+n <0.05% dynamic range 98db open loop and closed loop reference designs frequency response subwoofers: 0.5db from 10hz to 250hz full band: 0.5db from 20hz to 20khz 200khz pwm frequency output drive free of crossover artifacts qfn16 4x4 package the zxcd1210 reference designs provide output powers up to 500w rms with typical distortion and noise of less than 0.05% and a dynamic range of 98db. the closed loop designs ensure a high damping factor and excellent supply rejection. the open loop designs provide high performance in the most economic implementation. the closed loop reference designs include circuits specifically for subwoofer applications featuring a flat frequency response up to 250hz. the open loop designs give the zxcd1210 the ability to produce amplifiers with full a 20khz bandwidth. applications subwoofers home theatre systems multimedia wireless speakers portable audio this plot shows the thd+n versus power plot for a 500w closed loop subwoofer reference design. thd+n is 0.02% between 10w and 200w which is outstanding performance. 0.02 0.3 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 thd+n (%) 100m 500 200m 500m 1 2 5 10 20 50 100 200 output power (w)
zxcd1210 issue 2 - october 2007 2 www.zetex.com ? zetex semiconductors plc 2007 absolute maximum ratings - terminal voltage with respect to gnd v cc 20v power dissipation 1w package thermal resistance ( ja) 55c/w operating temperature range -40c to 70c maximum junction te mperature 125c storage temperature range -50c to 85c stresses beyond those listed under ?absolute maximum rating s? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum conditions for extended periods may affect device reliability. electrical characteristics - test conditions (unless otherwise stated) v cc = 16v, t a = 25c symbol parameter conditions limits units min. typ. max. v cc operating voltage range (*) notes: (*) for optimum thermal performance it is recommended that the zxcd1210 is operated with a v cc of 12v. 12 16 18 v i ss quiescent current v cc =12v 45 ma v cc = 18v, 16v 50 ma f ck clock frequency clock capacitor =330pf 150 200 250 khz t ck clock frequency tolerance clock capacitor = 330pf 25 % v olpwm low level pwm output voltage no load 100 mv v ohpwm high level pwm output voltage no load 7.5 v t dr pwm output rise and fall time load capacitance = 2200pf 50 ns t reg5v5 reg5v5 tolerance 1uf decoupling 5.23 5.5 5.77 v t reg9v ref9v tolerance 1uf decoupling 8.32 8.75 9.18 v r ain audio input impedance 1.35 1.8 2.3 k r sli modulation input impedance 1.35 1.8 2.3 k b ain audio input bias level 2.95 3.1 3.25 v b sli modulation input bias level 2.95 3.1 3.25 v v ck clock amplitude 0.89 1.05 1.2 v
zxcd1210 issue 2 - october 2007 3 www.zetex.com ? zetex semiconductors plc 2007 pin connection diagrams qfn16 4x4 package pin no. pin name pin description 1 pwml pwm drive 2 reg5v5 internal supply rail 3 ainl audio input 4 modil modulation control 5 modol modulation control 6 n/c no connection 7 ck external capacitor to set pwm frequency 8 modor modulation control 9 modir modulation control 10 ainr audio input 11 sgnd signal ground 12 pwmr pwm drive 13 pgnd power ground 14 reg9vr internal supply rail 15 vcc internal supply pin 16 reg9vl internal supply rail 1 2 3 4 5 6 7 8 12 11 10 9 16 15 14 13
zxcd1210 issue 2 - october 2007 4 www.zetex.com ? zetex semiconductors plc 2007 functional description on chip series regulators drop the external v cc supply (12v recommended) to the 9v and 5.5v supplies required by the internal circuitry of the device. the on chip oscillator produces a clock which is set to approximately 200khz by an external capacitor and an on chip resistor. the clock is set at least an order higher in frequency than the audio input. this clock is a triangle waveform which is used to modulate the incident analogue signal in order to produce the required pwm output. with no audio input signal applied, the pwm dut y cycle is nominally 50 %. as the audio input signal ascends towards the peak level, the crossing points with the (higher frequency) triangle wave also ascend. the pwm output exhibits a corresponding increase in output duty cycle. similarly, as the audio input si gnal descends, the duty cycle is correspondingly reduced. thus the triangle modulates the audio input generating a pulse width modulated (pwm) output. this principle is illustrated below. the pwm outputs drive the speaker load with th e audio information contained in the pwm signal, via the off chip gate drivers, h bridge and single stage lc filter network. the triangle amplitude is approximately 1v. the audio inputs are internally biased to a dc voltage of approximately v cc /5. the mid point dc level of the modulation control is around 2v. the triangular wave at the ck pin traverses between about 2.7v and 3.8v. audio triangle pwm comparator pwm output audio comparator o/p (duty cycle = 50%) comparator o/p (duty cycle = 75%) triangle output audio triangle output triangle input audio input pwm output
zxcd1210 issue 2 - october 2007 5 www.zetex.com ? zetex semiconductors plc 2007 applications information the high performance zxcd1210 modulator ic forms the heart of the zetex series of analog input class d amplifier reference designs. the modulator device provides complete control of the modulation function. details of these reference designs are containe d in individual data sheets: zxcdsubev series, zxcd50steval and zxcd100moeval as well as the zxcd series design guide. the zxcdsubev series of reference circuits are specifically designed for subwoofer applications. these switching amplifiers owe much of th eir outstanding audio performance to a unique feedback architecture designed to reduce distortion. by taking its feedback signal from the filtered amplifier output, the high gain circuit design co mpensates for bridge mismatches and filter non- linearities, to achieve a reduction in thd+n across the entire power band. zxcdsubev series architecture zxcdsubev series thd+n versus power pwm output output bridge filter audio input gate driver + - dc servo ac comp network feedback circuits bridge supply input buffering and bias mute zxcd1210 + - dc servo ac comp network feedback circuits mute zxcd1210 0.02 0.3 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 thd+n (%) 100m 500 200m 500m 1 2 5 10 20 50 100 200 output power (w) 0.02 0.3 0.04 0.06 0.08 0.1 0.12 0.14 0.16 0.18 0.2 0.22 0.24 0.26 0.28 thd+n (%) 100m 500 200m 500m 1 2 5 10 20 50 100 200 output power (w)
zxcd1210 issue 2 - october 2007 6 www.zetex.com ? zetex semiconductors plc 2007 the closed loop class d architecture maintains high efficiency ensuring cool running in the smallest footprint whilst achieving much reduc ed output impedance for tight bass control. additionally the feedback architecture comp ensates for supply dips and the bridge design accommodates high off load voltages. this means that use of a basic smps or an unregulated supply is achievable withou t compromising performance. the designs feature soft start controls and under voltage lockout controls to maintain anti-pop behavior. design options include short circuit, th ermal and dc offset prot ection circuits. volume and phase controls and high/low pass filters are simply added to the input circuitry. the scalable architecture of the zxcdsubev series utilises all n-channel output stage with either bridge tied load (btl) or single ended (se) configurations, together with power supply options to generate 150w, 300w or 500w rms into 4 designs from a single platform. many more power options readily produced. the zxcd50steval stereo and zxcd100moeval mono reference designs have an open loop architecture and feature output stages constructe d using zetex mosfets directly driven from the zxcd modulator device. zxcd50steval thd+n versus output power they offer 50w and 100w into 4 respectively with typical thd+n of 0.5% and 0.9% up to 90% full power. careful design has eliminated any potential crossover distortion artifacts. frequency response is flat to 20khz in these designs, typical noise floor is -110db. these designs feature anti- pop and over current protection and operate simply from a single supply rail. alternative configurations of these designs are possible with multi-channel applications simply created with a master slave arrangement. single ended operation is possible with the associated performance compromises. for further information on the zxcd series reference designs, contact your local zetex supplier with details of your production project requirements. 0.2 2.4 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 thd+n (%) 30m 50 50m 100m 200m 500m 1 2 5 10 20 output power (w) 0.2 2.4 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 thd+n (%) 30m 50 50m 100m 200m 500m 1 2 5 10 20 output power (w)
zxcd1210 issue 2 - october 2007 7 www.zetex.com ? zetex semiconductors plc 2007 package outline note: controlling dimensions are in millimeters. ap proximate dimensions are provided in inches ordering information dim. millimeters inches min. max. min. max. a 0.70 0.80 0.028 0.032 a1 0.00 0.05 0.00 0.002 a3 0.178 0.228 0.007 0.009 b 0.25 0.35 0.010 0.014 d 3.95 4.05 0.156 0.159 d2 2.05 2.15 0.081 0.085 e 3.95 4.05 0.156 0.159 e2 2.05 2.15 0.081 0.085 e 0.65 bsc 0.026 bsc l 0.35 0.45 0.014 0.018 device description package tape and reel suffix ZXCD1210JB16 class d modulator qfn16 4x4 ta (1,000 per reel) tc (3,000 per reel) a1 a d pin # 1 e b d2 d2 e2 e a3 e2 l 2 2
zxcd1210 issue 2 - october 2007 8 www.zetex.com ? zetex semiconductors plc 2007 zetex sales offices europe zetex gmbh kustermann-park balanstra?e 59 d-81541 mnchen germany telefon: (49) 89 45 49 49 0 fax: (49) 89 45 49 49 49 europe.sales@zetex.com americas zetex inc 700 veterans memorial highway hauppauge, ny 11788 usa telephone: (1) 631 360 2222 fax: (1) 631 360 8222 usa.sales@zetex.com asia pacific zetex (asia ltd) 3701-04 metroplaza tower 1 hing fong road, kwai fong hong kong telephone: (852) 26100 611 fax: (852) 24250 494 asia.sales@zetex.com corporate headquarters zetex semiconductors plc zetex technology park, chadderton oldham, ol9 9ll united kingdom telephone: (44) 161 622 4444 fax: (44) 161 622 4446 hq@zetex.com ? 2007 published by zetex semiconductors plc definitions product change zetex semiconductors reserves the right to alter, without notice, specifications, design, price or conditions of supply of any product or service. customers are solely responsible for obtaining th e latest relevant information before placing orders. applications disclaimer the circuits in this design/application note are offered as desi gn ideas. it is the responsibility of the user to ensure that t he circuit is fit for the user?s application and meets with the user?s requirements. no representation or warranty is given and no liability whatsoev er is assumed by zetex with respect to the accuracy or use of such in formation, or infringement of patents or other intellectual prop erty rights arising from such use or otherwise. zetex does not assume any le gal responsibility or will not be held legally liable (whether in contract, tort (including negligence), breach of statutory duty, restricti on or otherwise) for any damages, loss of profit, business, con tract, opportunity or consequential loss in the use of th ese circuit applications, under any circumstances. life support zetex products are specifically not authorized for use as critic al components in life support devices or systems without the ex press written approval of the chief executive officer of zetex semiconductors plc. as used herein: a. life support devices or systems are devices or systems which: 1. are intended to implant into the body or 2. support or sustain life and whose failure to perform when proper ly used in accordance with instructions for use provided in t he labelling can be reasonably expected to result in significant injury to the user. b. a critical component is any component in a life support devi ce or system whose failure to pe rform can be reasonably expected to cause the failure of the life support device or to affect its safety or effectiveness. reproduction the product specifications contained in this publication are issu ed to provide outline information only which (unless agreed by the company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the pr oducts or services concerned. terms and conditions all products are sold subjects to zetex? terms and conditions of sale, and this disclaimer (save in the event of a conflict bet ween the two when the terms of the contract shall prevail) according to region, supplied at the time of order acknowledgement. for the latest information on technology, delivery terms and condi tions and prices, please contact your nearest zetex sales off ice. quality of product zetex is an iso 9001 and ts16949 certified semiconductor manufacturer. to ensure quality of service and products we strongly advise the purchase of parts dire ctly from zetex semiconductors or one of our regionally authorized distributors. for a complete listing of authorized distributors please visit: www.zetex.com/salesnetwork zetex semiconductors does not warrant or accept any liability whatsoever in respect of any parts purchased through unauthorized sales channels. esd (electrostatic discharge) semiconductor devices are susceptible to damage by esd. suitab le precautions should be taken when handling and transporting dev ices. the possible damage to devices depends on the circumstances of the handling and transporting, and the nature of the device. the extent of damage can vary from immediate functional or parametric malfunc tion to degradation of function or performance in use over ti me. devices suspected of being affected should be replaced. green compliance zetex semiconductors is committed to envir onmental excellence in all aspects of its operations which includes meeting or exce eding regulatory requirements with respect to the use of hazardous s ubstances. numerous successful programs have been implemented to reduce the use of hazardous substances and/or emissions. all zetex components are compliant with the ro hs directive, and through this it is supporting its customers in their compliance with weee and elv directives. product status key: ?preview? future device intended for production at some point. samples may be available ?active? product status recommended for new designs ?last time buy (ltb)? device will be discontinued and last time buy period and delivery is in effect ?not recommended for new designs? device is still in production to support existing designs and production ?obsolete? production ha s been discontinued datasheet status key: ?draft version? this term denotes a very early datasheet ver sion and contains highly provisional information, which may change in any manner without notice. ?provisional version? this term denotes a pre-release datasheet. it provides a clear indication of anticipated performance. however, changes to the test conditions and specif ications may occur, at any time and without notice. ?issue? this term denotes an issued datasheet cont aining finalized specifications. however, changes to specifications may occur, at any time and without notice.
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