NUUTZT507 - PRELIMINARY BAND PASS FILTER FOR AUDIO SPECTRUM ANALYZER DISPLAY WB GENERAL DESCRIPTION MB PACKAGE OUTLINE The NJU7507 is a band pass filter for audio spectrum analyzer display. It consists of high and low band pass filters, CR oscillation circuit, control circuit and DC transfer circuit. Each band pass filter using the switched capacitor filter technology operates at the shared time by 7 bands which filter constant is switched by the internal clock. Therefore, the audio signal shared of 7 bands is output NJU7507XD NJU7507XN from a serial output terminal. The 14 bands version using the double by the cascade connection is prepared. Mi FEATURES i PIN CONFIGURATION @ BPF for the audio spectrum analyzer display of the 7 bands @ 14 bands extension is available by the cascade connection osct 0 1 YS 8{] VDD ( Version of A: For 7 bands application by the single ) ( Version of B : For 14 bands application by the double ) osc2 [J 2 7m] AIN @ BPF using the switched capacitor filter technology @ GR oscillation circuit on chip RST/CLKO [] 3 61] AOUT ( External clock input is avai lable ) @ Power-on initialization circuit on chip RD L| 4 5] VSS ( External reset input is available ) @ CMS Technology @ Package Out |ine DIP8 / DMP8 i BLOCK DIAGRAM >> Audio Signal __ ~~ Control Signal RST/CLKO RD -~--> Clock Signal OSCE . : Power-on oscs OSCFS Control Circuit Jinitialize Hors one/16 Hone/ i Hi [Re ka x) |e: BPF _Wigh Band High Band "Peak Detector LevelShiftor : : yh a | [ | | Out Put BUF Lf AIN eel BPF Low Band _ a) vob Low Band Peak Detector yss VSS 9-32_- New Japan Radio Co,Ltd.NJUT7SO7 . WE TERVINAL DESCRIPTION NO. ke # fe 1 osc External Resistor connecting terminal. 2 0SG2 External Resistor connecting terminal or External clock input terminal. Dor Both as Reset input terminal 3 RST/CLKO and the clock of (2/3)*fosc output terminal. 4 RD Trigger signal for reading-out the Aour of each band output terminal. 5 Ves GND 0 6 8 Voo Positive power supply +5.0 V 6 Aout Peak voltage of each band output terminal. 1 Ain Audio signal input terminal. Ml VERSION LINEUP AND PEAK FREQUENCY The NJU7507 prepares two version of A and B which are different of the peak frequency of each bands. The version of A is reconmended for the 7 bands application using the single and the version of B is reconmended for the 14 bands using the double by the cascade connection, however, the version of A can be used for the 14 bands using the double and the version of B can be used for the 7 bands using the single. Band single e Version of A on of B Version of A Version of B a 107 Note) The bands of fla, f2a, ... f7a correspond to the master side and the bands of fib, f2b, ... f7b correspond to the slave side at the cascade comection of the double. Note) It may not be output along the expectation at the peak frequency of * marking, since the sampling time is not enough. The example of using the single The exanple of using the double oset AQUT| > fla~fTa osci AUT} >fla~f7a | OSC1 AOUTL-> f1b~47b NJU7507 NJUT507 NJUT507 Master Slave __ OSC OSC osc2 f0Sc osc2 RST/CLKO 2/38 osc2 New Japan Radio Co,Ltd 9-33NUU7507 I FUNCTIONAL DESCRIPTION * Interface to external controller The example of the interface between the NUU7507 and the external controller is shown below: (1) Example of the interface to the external controller ( Using the single ) After the RST signal from the external controller is input and then the internal circuit is initialized, each band data is output as shown below timing chart: Since the RD signal is output before each band is switched, the external control ler is to count the number of the RD signal and is to recognize the status of the band and is to read the output data from the Aour terminal through the external A/D converter. __The output type of the external controller connected to the RST/CLKO terminal as the RST input should be the N-channel and oper-drain type or the diode should be connected between the RST/CLKO terminal and the output terminal of the external controller, so that the voltage of the RST/G.KO terminal is not gotten over the Vss level. sn oscl So wD 082 | Fase A/D AOUT > PONVERTEW > VSS RST/CLKO RD uCOM e 2" /fose . _ _ Aout XOX FFX 1 t8 ta t4 tT t1 12 te 18 13 fay tL RD . il fi A il Sl Du fl. tt jl fi Ju J RST Ve : . . 256/fosc Since the RD signal is output before j____"___ > 256/fosc of each band switched, the out- AOUT |. OOEK put data should be read out within the i limited time as shown right: RD =p 8/ tose i Available Period VLA of Read-out If the RST signal which pulse width is AQUT Ta more than 4/fose is input, the internal /tosctiN] 52/tose ! circuit is initialized and the data of or 1 band is output from the Aour termina! _ after 52/fosc of the rise edge of the rst {Tf RST signal. 9-34_- New Japan Radio Co,Ltd.P| voureo> bi (2) Exanple of the interface to the external controller ( Using the double ) The 14 bands application is available using the cascade connection of the double NJU7507 as shown blow. After the RST signals from the external controller are input to each of the master and the slave of the NUJU7507 and then each internal circuit is initialized, each band data is output as shown below timing chart: Since the RD signals are output from the master and the slave before each band is switched, the external controller is to count the number of the RD signals and is to recognize the status of the band and is to read the output data from each Aour terminals through the external A/D converter. __ The master clock for the slave is provided with the output signa! fron_ the RST/CLKO terminal of the master. The master clock for the slave is stopped when the RST signal is input from the external controller to the master, so that the RST/CLKO terminal of the master is used both as the RST input of the master and the master_clock for the slave. __The output type of the external controller connected to each RST/CLKO terminal as the RST input should be the Nchannel and open-drain type or the diodes should be connected between each RST/CLKO termina! and the output terminals of the external controller, so that the voltage of each RST/CLKO terminal is not gotten over the Vss level. Laud AIN Osc are by So wv osc2 v oe nw + Fry > Aout me mm osc2 A/D > 4 AOU, OL 5 > CONVERTER 2 = 2 a T vss RST/CLKO R D| [RST/CLEO RD A on oJ y 1 & zZRCOM i6 Master te 2 / fac . hott ICED BODIE CIE 1 f1 f2 a 4 171 2 f6 48 sta f1 f2 ta 41 , RD o a o o noo noon 1 9 n 0 O of oh 1 ' v WT (ou 16 ' Slave le . _ 2 7 tose * 3/2 . . > AOUT X_ Xs XK CEE NTE XEON OX 2 ' #1 t2 ta t4 17 fl #2 68 "a f& 4y ' f1 RD fl ll Il nt fl fi il 0 n Il St t B t ' ist at onal New Japan Radio Co, Ld 9-35Pe | NJU7507 . 256/fosc Since each RD signal of the master and le (256/fosct3/2) ; the slave is output before 256/fosc AQUT TOOT ( 256/fosc#3/2 ) of each band switched, the output data should be read out with- RD + &B Perose /2) in the limited time as shown right; "() is corre Available Period WMA * The (.) is corresponded to the slave. var lRead-out If the RST signal which pulse width is Aout, ra > more than 4/fosc is input to the master, the internal circuit is initialized and AffosclMIN) B2/Tose the data of f1 band is output from the ast, Ts Aout terminal of the master after ' , ' 59/fosc of the rise edge of the RST rn ' ' + $$ signal. _ 6/foscLMIN] 78/Tosc : The RST signal for the slave should be ' set to L level while the RST signal aot fn" Pre for the master is L level and should keep L level more than 6/fosc. So the slave operates as same as the master after 78/fosc of the rise edge of the RST signal for the slave. 9-36Wew Japan Radio Co.Ltd.NJU7507 MW ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL RAT tNG@S UNIT | NOTE Supply Voltage Voo 0, 3~+7 Vv Vin 0. 3~Vo0+0. 3 2 Input Voltage Vic ~0.3~0 V 3, 6 Output Voltage Vout 0, 3~Vo0+0. 3 V Power Dissipation Po 500 (DIP) 300 (DMP) nV Operating Temperature Topr -30~85 C Storage Terperature Tate 55-~ 125 C Note 1) If the IC are used on condition above the absolute maximum ratings, the IC may be destroyed. Using the IC within electric characteristics conditions will cause malfunction and poor reliability. Note 2) All voltage values are specified as Vss = OV. Note 3) When the voltage of the RST/CLKO terminal is gotten over the Vss level, the diode should be connected between the RST/CLKO terminal and the external. Note 4) Decoupling capacitor should be connected between the Voo terminal and the Vss due to the stabilization of the operation. Note 5) Applied to the Ain or the OSC2 terminals. Note 6) Applied to the RST/CLKO terminal. Mi ELECTRICAL CHARACTERISTICS DC CHARACTERISTICS ( Voo=5V, Vss= OV, Ta=25C ) PARAMETER SYMBOL CONDITITONS MIN TYP MAX | UNIT | NOTE Operating Voltage Voo 4.5 5.0 6.0 V Operating Current loo Doo TERMINAL _ 6.0 12 mA hos Viv =0V 0.033] 0.05 | 0.1 Input Leak Current 1 ne Ain TERMINAL Vin av <0, 033 10.05 O14 m Input Leak Current 2 tiuz | RST/CLKO TERMINAL | Vin2=O0V 0.05 0.1 0.2 | mA External Clock Viuc 0 1 5 Input Voltage Ving | 0802 TERMINAL 35 [Tso | Vou1 lor 1=100 WA 0 _ 0.5 Output Voltage 1 Voc] RD TERMINAL len =100 4A | 4.5 50 Vv Vor2 | RST/CLKO lou: =100 2A 0 | 05 Output Voltage 2 Vou TERMINAL [lomi=-5uA | 425 145 1475 | Output Offset Voltage | Vos | Aouy TERMINAL Aw: OPEN = 500 | mv Aout TERMINAL Sine Wave Input] 26.0 dB | 7,8,9 BPF Output Voltage Vour | 6 =Fi~f7 Vin=200nVp - 3.5 = Tv_T78 Note 7) This specification is tested on condition of fcrx=400KHz ( The external clock is input to the OSC2 terminal through the capacitor for AC coupling. Note 8) Each input frequency of fl to f7 is reffered to the table of the VERSION LINEUP AND PEAK FREQUENCY . Note 9) This specification is calculated from Vour / Vin . New Japan Radio Co, Ltd 9-37P| voureo si Ml AC CHARACTERISTICS ( Voo=4.5~6.0V, Vss=OV, Ta=25C ) PARAMETER SYNEOL CONDITIONS MIN TYP MAX | UNIT | NOTE Oscillation Clock Freq. | fosc | RSI/CLKO Terminal Voo=>V | 360 400 440 | KHz | 10 External Clock Frequency | fox | RST/QLKO Terminal toa 400 | 800 {KH | 11 Master Ne RD Pulse Width tewro | RD Terminal SUK us | 12 12/fosc Slave 12/fork __ _ Master ifose RST Pulse Width tewrs | RST/CLKO Terminal ose us | 13 Slave ose 6/foik RST Rise/Fall Time tr, tf} RST/CLKO Terminal 100 nA | 13 Note 10) The example for the CR Oscillation 1 OSC1 RT RT:13K92 0 (2%) CT: 221 +5 | osc2 OpF = (5%) CT * The oscillation clock frequency is calculated from the output frequency of the RST/CLKO ter- minal by 3/2. VSS Note 11) The example for the external clock input Open OSGI The input signal for the OSC2 termina! should be the condition of the pulse of DUTY50%+10%. * The oscillation clock frequency is calculated from the output frequency of the RST/CLKO ter- Oscillator osc minal by 3/2 Note 12) The output wave form of the RD terminal. <tpwro > Note 13) The input wave form of the RST terminal. tf> < > <tr i ti 0. To ip Boo 0.2Voo * * 0. 2Voo 9-38 New Japan Radio Co, Ltd.| wauvee> bw Hl APPLICATION CIRCUIT (1) AUDCO IN AUDIO IN Oo >> ---9 Lcu RCH l I oO + | + 0 AUDIO OUT AUDIO OUT frcr(,c,.,CC4 pcccc4 I ' I I ' RESONANCE NJV7305 RESONANCE! ! NJU73 ! KERCUIT H 7306 Lo cercuir ! ! i NIU7307 ! ! ! ' 1 i t ' i I roe ' too ' WA I WW *} #2, SAT. AlN osce NJU7507 220pF OSCI 13K 3 2 > s SF/CLEO Aout y Lig.) DISPLAY DRIVER r= DISPLAY #1) The capacitor for AC coupling connected to the Ais terminal should be needed. #2.) Connecting the attenuator, the dynamic range of the display can be changed. *3) When the voltage of the output terminal of the COM gets over the Vss level, the diode should be connected between the RST/CLKO terminal and the output. of the COM. New Japan Radio Co, Lid 9.39NJIUT7TSO7 = WE APPLICATION CIRCUIT (2) AUDLO IN AUDIO IN Oo O Lei RCH a o + 4 + AUDIO OUT AUDIO OUT yoo t7 777 I | i | RESONANCE, NJU7305 RESONANCE 1 -_| NJU7306 [, | I incuiT NJU7307 teIRCUIT | \ i \ io! i! | ATT. *] ATT. Ain #2 #2 An oscil 13K NJU7507 sc2 NJU7307 osc2 220pF SLAVE WASTER Jt RD AST/CLEO RST/CLEO RD AONT t x3 AONT in A/D = DISPLAY DRIVER DISPLAY *1) The capacitor for AC coupling connected to the Ain terminal should be needed. *2 ) Comecting the attenuator, the dynamic range of the display can be changed. #3) When the voltage of the output terminal of the COM gets over the Ves level, the diode should be connected between the RST/CLKO terminal and the output of the COM 9-40 New Japan Radio Co, Lid.