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ics for audio common use 1 AN7328K pre-settable equalizer ic for radio-cassette n overview the AN7328K is an ic designed for radio cassette equal- izers with five preset modes making it possible to select one of the five frequency response characteristics. by using this ic as the prestage circuit of an output amplifier, audio output with optimum tone characteristics according to rock, pop, flat, jazz, or classical music is obtainaed. n features equalizer characteristics with peaking audio frequen- cies of 100 hz and 7 khz are available in five different modes the rock mode is automatically selected as a default setting microcomputer control possible low operating voltage (supply voltage : 3.6 v min.) n applications stereo radio cassette recorder with built-in cd player portable stereo set n block diagram sdip022-p-0300a unit : mm 1 2 3 4 5 6 7 8 9 10 11 22 21 20 19 18 17 16 15 14 13 12 bass bass treble treble flat flat flat flat mix. mix. analog switch regulator v ref v cc mute t rr gnd 7.62 0.25 3 to 15 0.35 + 0 .1 0 ?0 .0 5 19.1 0.3 111 22 12 6.35 0.30 4.50 0.25 3.45 0.25 1.10 0.25 1.778 0.5 0.1 0.90 0.25 seating plane maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
2 AN7328K ics for audio common use n absolute maximum ratings parameter symbol ratings unit supply voltage v cc 14 v supply current i cc 50 ma power dissipation p d 700 mw operating ambient temperature * t opr - 25 to + 75 c storage temperature * t stg - 55 to + 150 c n recommended operating range parameter symbol range unit supply voltage v cc 3.6 to 12 v note) * : except these items, all other measurements are taken at t a = 25 c. pin no. description 1 r-ch. input 2 r-ch. negative feedback 1 3 r-ch. bass 4 r-ch. treble 5 r-ch. negative feedback 2 6 r-ch. output 7 classic 8 rock 9 jazz 10 pops 11 flat n pin descriptions pin no. description 12 gnd 13 v cc 14 ripple rejection 15 mute t 16 reference voltage 17 l-ch. output 18 l-ch. negative feedback 2 19 l-ch. treble 20 l-ch. bass 21 l-ch. negative feedback 1 22 l-ch. input maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
ics for audio common use AN7328K 3 n electrical characteristics at v cc = 6 v, freq. = 1 khz, t a = 25 c,flat mode,unless otherwise specified parameter symbol conditions min typ max unit quiescent current i cq1 no input 10.5 15.0 19.5 ma channel balance cb v inl = 0.1 v, v inr = 0.1 v - 10 1db reference voltage v ref no input 2.4 3.4 4.3 v ripple rejection rr v r = 0.1 v, f r = 100 hz 35 40 ? db channel separation cs v in = 0.1 v, measure v out 35 40 ? db output noise * v no v in = 0 v, r g = 2.2 k w? 10 20 m v thd (1 khz) * thd1 v in = 0.1 v ? 0.1 0.3 % gain (100 hz) g v1 v in = 0.1 v - 2.0 - 0.5 2.0 db gain (7 khz) g v2 v in = 0.1 v - 2.0 0.5 2.0 db maximum output voltage v om thd = 1 %,r l = 10 k w 0.6 1.0 1.4 v rms channel (classic) quiescent current i cq2 no input 11.5 16.0 20.5 ma gain (100 hz) g v3 v in = 0.1 v 2 4 6 db gain (7 khz) g v4 v in = 0.1 v 2 4 6 db channel (rock) quiescent current i cq3 no input 10.5 14.5 19.0 ma gain (100 hz) g v5 v in = 0.1 v 6 8 10 db gain (7 khz) g v6 v in = 0.1 v 6 8 10 db channel (jazz) quiescent current i cq4 no input 10.5 14.5 19.0 ma gain (100 hz) g v7 v in = 0.1 v 6 8 10 db gain (7 khz) g v8 v in = 0.1 v 2 4 6 db channel (pops) quiescent current i cq5 no input 10.5 14.5 19.5 ma gain (100 hz) g v9 v in = 0.1 v 2 4 6 db gain (7 khz) g v10 v in = 0.1 v 6 8 10 db channel (classic) thd (1 khz) * thd2 v in = 0.1 v ? 0.25 0.3 % channel (rock) thd (1 khz) * thd3 v in = 0.1 v ? 0.25 0.3 % channel (jazz) thd (1 khz) * thd4 v in = 0.1 v ? 0.25 0.3 % channel (pops) thd (1 khz) * thd5 v in = 0.1 v ? 0.25 0.3 % note) * : din audio filter used maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
4 AN7328K ics for audio common use n terminal equivalent circuits pin no. equivalent circuit description dc bias (v) 1 bass input for r-ch. : 3.40 these are the inputs to the ic. these inputs can be from pre or vol block,through a 0.47 m f cap. i/p impedance ? 5.8 k w 2 negative feedback pin & pass filter pin : 3.40 3c f and r in form a low pass filter and its cutoff frequency can be changed by varying c f . g v can be changed by varying r in externally. 4 refer to pin1 treble input for r-ch. : 3.40 the output signal of previous stage will go through a filtering network before input to this pin. impedance ? decided by the filter network. nb : peak frequency can be changed by varying capacitor value. 10 k w 0.47 m f 0.068 m f 0.01 m f v in v ref v cc v cc v ref 1.8 k w pin 1, 22 pin 4, 19 430 w rin pin 2, 21 pin 3, 20 output input v ref rf cf 0 db fcut freq. g v (db) 0 db - 3 db 7 khz freq. g v (db) maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
ics for audio common use AN7328K 5 n terminal equivalent circuits (continued) pin no. equivalent circuit description dc bias (v) 5 nagative feedback pin for treble : 3.40 g v can be changed by varying r in externally. 6 output pin for r-ch. : 3.40 pushpull output pin for connecting to the next stage through a coupling capacitor. z out ? 75 w 7 analog switch : 2.45 or 0 8 switch pin for rock,pops,jazz,classic & 9 flat,with initial mode set at rock mode. 10 11 the current source circuit provides the ability to drive the led indicators. the average current is about 2 ma. if the led indicators need more than 2 ma, additional transistor is needed. please refer to the application notes. selected mode has a bias of 2.45 v & other pins have bias of 0 v. 12 ? gnd 0.00 13 ? v cc 6.00 input pin 6, 17 v ref r l v cc pin 7, 8, 9 10, 11 v cc rin output input pin 5, 18 v ref rf maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
6 AN7328K ics for audio common use n terminal equivalent circuits (continued) pin no. equivalent circuit description dc bias (v) 14 ripple rejection : 5.00 to connect with a capacitor to minimize ripple generated from v cc source. 15 mute t : 1.60 to connect with a capacitor to mute pop noise. the time constant of the mute pulse may be changed by varying c sd . 16 reference voltage : 3.40 provide fixed dc bias, which is slightly above 1/2 v cc to allow for bigger dynamic range. 17 refer to pin6 output pin for l-ch. : 3.40 refer to pin6 18 refer to pin5 nagative feedback pin for treble : 3.40 refer to pin5 19 refer to pin4 treble input for l-ch. : 3.40 refer to pin4 20 refer to pin2 negative feedback pin & pass filter pin : 3.40 refer to pin2 21 refer to pin2 negative feedback pin & pass filter pin : 3.40 refer to pin2 22 refer to pin1 bass input for l-ch. : 3.40 refer to pin1 14 13 k w v cc 10 k w 1 k w 22 m f 15 28 k w v cc csd 10 m f 16 bias bias cref 47 m f maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
ics for audio common use AN7328K 7 n application circuit example 12 13 14 15 16 17 18 19 20 21 lin bfl nf1l tfl nf2l lout rr gnd mute t v ref v cc v cc 22 11 10 9 8 7 6 5 4 3 2 1 flat pops jazz rock classic rout nf2r tfr bfr rin v in r v out r nf1r 1.5 k w 1.8 k w 2.0 k w 10 k w 430 w 0.01 m f 1 m f 0.068 m f 0.47 m f 0.068 m f e d c b a 0.47 m f 0.01 m f 1 m f 10 m f 22 m f 100 m f 47 m f 0.068 m f 0.068 m f 2.0 k w 1.8 k w 1.5 k w 430 w v out l v in l * * note) * : for more information regarding frequency response characteristics and led indicator interfacing, please refer to appli- cation notes. maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
8 AN7328K ics for audio common use n application note preset graphic equaliser this ic provides 5 preset modes by means of 5 push button switches, with built-in led indicator. the boosting frequencies are 100 hz and 7 khz. a) rock by pressing this switch, both 100 hz and 7 khz signal are boosted by 8 db. this is the initial preset mode, i.e. when v cc is turn on, this mode will be on automatically. b) pops this preset mode will boost 100 hz signal by 4 db and 7 khz signal by 8 db. c) flat there is a built-in buffer for this mode to pass the signal directly to output without processing. d) classic this mode will boost both 100 hz and 7 khz signal by 4 db. e) jazz this preset mode will boost 100 hz signal by 8 db and 7 khz signal by 4 db. frequency response curve 100 hz 7 khz response curve rock + 8 db + 8 db pops + 4 db + 8 db flat ?? classic + 4 db + 4 db jazz + 8 db + 4 db 8 0 8 4 4 0 0 0 8 0 100 hz 7 khz 4 maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
ics for audio common use AN7328K 9 n application note (continued) interfacing with microcomputer micom o/p selected p4 p3 p2 p1 p0 mode l l l l h flat l l l h l pops l l h l l jazz l h l l l rock h l l l l classic micom o/p decoder o/p selected p2 p1 p0 b4 b3 b2 b1 b0 mode lllllllh flat l l h l l l h l pops l h l l l h l l jazz l h h l h l l l rock h l l h l l l l classic 122 21 20 19 18 17 16 15 14 13 12 2 3 4 5 6 7 8 9 10 11 AN7328K micom 10 k w 10 k w 10 k w 10 k w 10 k w output ports classic p4 p3 p2 p1 p0 rock jazz pops flat 122 21 20 19 18 17 16 15 14 13 12 2 3 4 5 6 7 8 9 10 11 AN7328K 3 to 8 decoder 10 k w 10 k w 10 k w 10 k w 10 k w output ports output ports input ports classic b4 b3 b2 b7 b6 b5 b1 b0 micom p2 p1 p0 a2 a1 a0 rock jazz pops flat maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
10 AN7328K ics for audio common use n application note (continued) 1. this ic has two peak frequencies (100 hz & 7 khz) which can be adjusted by varying external component value. below is a table of gain,frequency shift vs external component value. peak freq. (100 hz) peak freq. (7 khz) low freq. gain high freq. gain increase decrease increase decrease increase decrease increase decrease rl 1 ?? - ?? - rl 2 ?????? - rl 3 ???? - ?? rl 4 ?? - ?? - cl 1 ?? - ?? - cl 2 ???? - ?? cl 3 ?? - ?? - cl 4 - ?????? - increase component value and decrease component value 2. if the previous stage has high output impedance (z out ), this may cause the output drop at high frequency. in this situation, the following circuit is recommended to improve the high frequency performance. cl 2 rl 3 cl 1 cl 3 rl 1 rl 2 rl 4 cl 4 v in l 22 21 20 19 18 17 16 1 m f 47 m f v out l AN7328K v in 1,22 2,21 3,20 4,19 5,18 16 47 m f 1 m f 0.068 m f 2200 pf 0.01 m f 910 w 1.8 k w 5.1 k w 2.7 k w AN7328K maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
ics for audio common use AN7328K 11 n application note (continued) interfacing with led indicators whose the current exceed 2 ma. transistor built-in resistor electrical characteristics q2 (rock) r 1 = 10 k w ic = 100 ma r 2 = 10 k w h fe = 35 (min.) to 100 (max.) q1 (classic) r 1 = 4.7 k w ic = 100 ma q3 (jazz) r 2 = 10 k w h fe = 35 (min.) to 100 (max.) q4 (pops) q5 (flat) e.g. r c = 390 w pin voltage to turn on led is ? 2.5 v. v led = 2.68 v, led current ? 13 ma 7 8 9 10 11 r 1 r 2 r c r 1 q1 10 k w q2 q3 q4 q5 r 2 r 1 r 2 r 1 r 2 r 1 r 2 v cc classic rock jazz pops flat maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/
request for your special attention and precautions in using the technical information and semiconductors described in this book (1) if any of the products or technical information described in this book is to be exported or provided to non-residents, the laws and regulations of the exporting country, especially, those with regard to security export control, must be observed. (2) the technical information described in this book is intended only to show the main characteristics and application circuit examples of the products, and no license is granted under any intellectual property right or other right owned by our company or any other company. therefore, no responsibility is assumed by our company as to the infringement upon any such right owned by any other company which may arise as a result of the use of technical information described in this book. (3) the products described in this book are intended to be used for standard applications or general electronic equipment (such as office equipment, communications equipment, measuring instruments and household appliances). consult our sales staff in advance for information on the following applications: ? special applications (such as for airplanes, aerospace, automobiles, traffic control equipment, combustion equipment, life support systems and safety devices) in which exceptional quality and reliability are required, or if the failure or malfunction of the prod- ucts may directly jeopardize life or harm the human body. ? any applications other than the standard applications intended. (4) the products and product specifications described in this book are subject to change without notice for modification and/or im- provement. at the final stage of your design, purchasing, or use of the products, therefore, ask for the most up-to-date product standards in advance to make sure that the latest specifications satisfy your requirements. (5) when designing your equipment, comply with the range of absolute maximum rating and the guaranteed operating conditions (operating power supply voltage and operating environment etc.). especially, please be careful not to exceed the range of absolute maximum rating on the transient state, such as power-on, power-off and mode-switching. otherwise, we will not be liable for any defect which may arise later in your equipment. even when the products are used within the guaranteed values, take into the consideration of incidence of break down and failure mode, possible to occur to semiconductor products. measures on the systems such as redundant design, arresting the spread of fire or preventing glitch are recommended in order to prevent physical injury, fire, social damages, for example, by using the products. (6) comply with the instructions for use in order to prevent breakdown and characteristics change due to external factors (esd, eos, thermal stress and mechanical stress) at the time of handling, mounting or at customer's process. when using products for which damp-proof packing is required, satisfy the conditions, such as shelf life and the elapsed time since first opening the packages. (7) this book may be not reprinted or reproduced whether wholly or partially, without the prior written permission of matsushita electric industrial co., ltd. maintenance/ discontinued maintenance/discontinued includes following four product lifecycle stage. planed maintenance type maintenance type planed discontinued typed discontinued type please visit following url about latest information. http://www.semicon.panasonic.co.jp/en/

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