MITSUBISHI SOUND PROCESSORS M61506FP Peak hold IC for 5 band spectrum analyzer displays DESCRIPTION The M61506FP is a 5 band peak hold ICs that use microprocessor time division to produce serial output for spectrum analyzer displays. FEATURES 5 band peak hold elements for spectrum analyzer displays. Discharge time constant circuit for each band is on the chip. Single 5V power supply. RECOMMENDED OPERATING CONDITIONS Supply voltage range 4.5 to 6.5V Rated supply voltage 5.0 V SYSTEM BLOCK DIAGRAM Audio signal BPF5 Peak BPF5 Peak Peak BPF5 Hold5 Peak BPF5 Hold5 Peak BPF5 Hold5 Hold5 Hold5 Peak SELECTOR Hold output µ-com interface SELA SELC SELB ENB MITSUBISHI ELECTRIC ( 1 / 13 ) BLOCK DIAGRAM Vcc/2 1 Vcc/2 Gen. VREF 2 V REF Gen. 16 GND2 SELECTOR 15 PHOUT (VccX0.3) IREF TEST I REF Gen. 3 HOLD OUTPUT BPF IN DIFOUT 4 13 ENB 2K + D P.HOLD f2 BPF 2 P.HOLD 5 12 SELC Amp- f3 BPF 3 P.HOLD f4 BPF 4 P.HOLD + C CNF f1 BPF 1 Amp- 2K COUT 11 SELB 6 f5 BPF 5 AOUT 7 14 GND1 P.HOLD <PEAK HOLD> 10 SELA 2K Amp-A + ANF HOLD C RESET 8 9 Vcc (Notes)f1=105Hz,f2=340Hz,f3=1KHz,f4=3.4KHz,f5=10.5KHz (The value is the design value) Units Resistance :Ω Capacitance: F MITSUBISHI ELECTRIC ( 2 / 13 ) FUNCTIONAL DESCRIPTION (1)The audio signal amplified by Amp-A and Amp-D into BPF/peak hold circuit for spectrum analyzer display. Because the last output signal inputs into A/D of microprocessor. The Vcc,GND had better be common with Vcc,GND of A/D of maicroprocessor. It untilizes effect of common-mode rejection of Amp-D.Amp-C is the input amplifier to reject common-mode signal(noise).To get to good ground isolation. (2)BPF/peak hold circuit is fit for 5 band spectrum analyzer display. <center frequency> f1=105Hz f2=340Hz f3=1KHz f4=3.4KHz f5=10.5KHz (The value is the design value) Center frequency and Q of BPF is ω0=gm/C gm:matual condactance of inside amplifier circuit (It depends on outside resistor value of Pin.No.3) C:inside capacitor Q=(R1+R2)/R1:it is fixed by inside resistor ratio. (The design value of Q is 3.5) (3)The hold capacitor of peak hold circuit is included. The reset(discharge) signal is made automatically after ending the output of hold value(Discharge pulse effect:-3dB(typ).fall refer to output value) (4)The internal output voltage of peak hold circuit is refered to Vcc/2. (Pin.No.1) When it is selected by the output select circuit,it appear at PHout (Pin.No.15) refered to GND. MITSUBISHI ELECTRIC ( 3 / 13 ) PIN DESCRIPTION PIN No. Name I/O Function 1 Vcc/2 I 1/2Vcc bias 2 VREF I 0.3Vcc bias 3 IREF I BPF center frequency setting current terminal 4 DIFOUT O Output of amplifier-D(BPF input signal) 5 COUT O Output of amplifier-C 6 CNF I Inverted input of amplifier-C 7 AOUT O Output of amplifier-A 8 ANF I Inverted input of amplifier-A 9 Vcc I System supply 10 SELA I Output setting control terminal A(logic input) 11 SELB I Output setting control terminal B(logic input) 12 SELC I Output setting control terminal C(logic input) 13 ENB I Output setting control enable terminal(logic input) 14 GND1 I Ground 1 15 PHOUT O Peak hold output terminal 16 GND2 I Ground 2 MITSUBISHI ELECTRIC ( 4 / 13 ) PIN No. 1 2 Name Vcc/2 VREF I Vcc I 180K 1 180K 3 IREF I 4 DIFOUT O 5 COUT O 6 CNF I 7 AOUT O 350K 2 3 150K GND2 Vcc/2 6 5 2K 2K Vcc/2 8 8 ANF I 9 Vcc I SELA I 10 Peripheral circuit of pins I/O 2K 4 7 Supply 10,11,12,13 11 SELB I VccX0.3 20K 12 SELC I 10K VccX0.3 13 ENB I 14 GND1 I 15 PHOUT O 16 GND2 I Ground1 10K GND2 15 Ground2 MITSUBISHI ELECTRIC ( 5 / 13 ) ABSOLUTE MAXIMUM RATINGS Parameter Symbol Vcc(max) Conditions Supply Voltage Ratings Unit 7 V Pd Power dissipation Ta<25 = C 540 mW K Thermal derating Ta>25 C 5.4 mW/ C Topr Operating temperature -20 to +75 C Tstg Storage temperature -40 to +125 C Vi(max) Input voltage range Vo(max) Output voltage range GND-0.3 to Vcc+0.3 V GND to Vcc V Thermal derating(maximum rating) 0.6 0.54 0.5 0.4 0.3 0.27 0.2 0.1 0 0 25 50 75 100 AMBIENT TEMPERATURE Ta ( MITSUBISHI ELECTRIC 125 150 C) ( 6 / 13 ) Recommended operating conditions (Ta=25 C unless otherwise noted) Parameter Supply voltage Logic input H level voltage Logic input L level voltage Symbol Conditions Vcc MIN TYP MAX 4.5 5.0 6.5 V VCC V 0.5 V VIH Vcc=5V 2.5 VIL Vcc=5V GND Unit (Note 1) The center frequency characteristics of BPF are determined by the resistor connected between 3pin terminal and GND.If it is necessary,adjust the resistor value(note:all bands will be shifted together). The Q of BPF is fixed in 3.5 by inside circuit. (Note 2) The internal output resistor of peak hold output(PIN 15)is 10kW typ. The input resistance of the microprocessor must be much larger than 10k W . (Note 3) The control voltage from the microprocessor must be from GND -0.3V to Vcc+0.3V. If the control voltage is out of the above range. It`s necessary to modify the control voltage in the above range by using resistors or diodes. MITSUBISHI ELECTRIC ( 7 / 13 ) OUTPUT CONTROL SPECIFICATION <Output select logic table> PHout (PinNo.15) ENB SELA SELB SELC GND(output stop) 0 X X X GND 1 0 0 0 f1:105Hz 1 0 0 1 f2:340Hz 1 0 1 0 GND 1 0 1 1 f3:1kHz 1 1 0 0 GND 1 1 0 1 f4:3.4kHz 1 1 1 0 f5:10.5kHz 1 1 1 1 Note X:Don`t Care <Note 1> 'H'=low level,'1'=high level,'X'='0'or'1' <Note 2> The output setting time is more than 10µsec. (When the output setting time is short,the output value and reset signal become unstable) 90% PHout Ts(10µSec.MAX) fn SELECT (internal signal) <SELECT state> <Automatic Generation by inside time constant> fn RESET (internal signal) Tr(25µSec.TYP) MITSUBISHI ELECTRIC ( 8 / 13 ) TIMING CHART H ENB L H SELA X X X X X X L H SELB L H SELC L PHout f1 GND f2 f3 f4 f5 H f1 RESET (105Hz) L H f2 RESET L (340Hz) H f3 RESET L (1KHz) H f4 RESET (3.4KHz) L H f5 RESET (10.5KHZ) L MITSUBISHI ELECTRIC ( 9 / 13 ) ELECTRICAL CHARACTERISTICS (Ta=25 C ,Vcc=5.0V,PHout(Pin.No.15)RL=1MΩ unless otherwise noted.VAIN=-30dBV, f=1KHz,ENB(Pin.No.13)=1) Parameter Symbol Condition Icc No signal,No select (ENB,SELA,SELB,SELC=0) Vo f1 to f5 Measured at each output (VAIN=-14dBV) Output offset voltage Vos f1 to f5 Measured at each output (No signal,ENB=0/1) Logic input H level VIH Logic input L level Circuit current Maximum output level Common-mode rejection ratio Limits Min 4.0 typ Max Unit 8 13 mA V 4.7 30 60 mV 2.5 5.0 Vcc +0.3 V VIL GND -0.3 0 0.5 V CMRR 25 50 dB f1 output level Vo1 f1(fin=80 to 130Hz) 0.5 1.0 1.70 V f2 output level Vo2 f2(fin=270 to 410Hz) 0.5 1.0 1.70 V f3 output level Vo3 f3(fin=0.8 to 1.2KHz) 0.5 1.0 1.70 V f4 output level Vo4 f4(fin=2.7 to 4.1KHz) 0.5 1.0 1.70 V f5 output level Vo5 f5(fin=8.0 to 13.0KHz) 0.5 1.0 1.70 V Ts The time from the rise of output selection until the rise of PHout (90% of peak) 5 10 Output response time µsec <Reference> Discharge level DS Inside reset signal Tr=25µsecTYP. MITSUBISHI ELECTRIC -3 dB ( 10 / 13 ) TEST CIRCUIT Vcc/2 Vcc/2 Gen. 1 16 GND2 0.1m PHOUT VREF 2 0.1m 15 SELECTOR V REF Gen. 1M IREF I REF Gen. 3 100K HOLD OUTPUT BPF IN 4 T CIRCUIT f1 BPF 1 P.HOLD D 2K f2 BPF 2 P.HOLD BPF 3 P.HOLD f4 BPF 4 P.HOLD BPF 5 P.HOLD 12 f3 + C CN F 6 f5 39K Px4 ENB 5 100K IN CONTROL Amp- Amp- 0.47m GND1 13 2K + COU 14 MCU I/F DIFOUT OUTPUT CONTROL (Vccx0.3) Px3 SELC 11 Px2 SELB AOU <PEAK HOLD> T 7 Amp-A 100K 0.47m AIN 2K + 10 Px1 SELA HOLD C RESET AN Vcc F 8 9 39K 0.01m 10m Units resistance:W capacitance:F MITSUBISHI ELECTRIC ( 11 / 13 ) APPLICATION EXAMPLE Vcc/2 Vcc/2 Gen. 1 16 GND2 0.1µ VREF 2 V REF Gen. 0.1µ SELECTOR PHOUT (VccX0.3) IREF 14 I REF Gen. 3 100K HOLD OUTPUT BPF IN DIFOUT 4 COU T P.HOLD f2 BPF 2 P.HOLD BPF 3 P.HOLD AmpD 2K Amp- A/D f3 f4 BPF 4 P.HOLD BPF 5 P.HOLD F 6 f5 270K/2 Px4 ENB 12 + C CN 0.47µ f1 BPF 1 5 100K GND1 13 2K + COM 15 Px3 SELC MCU 11 Px2 SELB <Common-mode Noise Rejection > ground isolation AOU <PEAK HOLD> T 7 2K Amp-A 100K + 0.047µ CH1 CH2 Px1 SELA HOLD C RESET AN Vcc F 8 0.047µ 10 9 270K 0.01µ 270K 10µ <Input Audio Signal> Units resistance:Ω capacitance:F MITSUBISHI ELECTRIC ( 12 / 13 ) OUTLINE MITSUBISHI ELECTRIC ( 13 / 13 )