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M62457

Peak hold IC for 5 band spectrum analayzer displays

MITSUBISHI ELECTRIC  

Functional description

MITSUBISHI SOUND PROCESSOR ICs

M62457FP

Peak hold IC for 5 band spectrum analayzer displays

(1) Audio signal passes Amp-a and Amp-d, and it is input into BPF/peak hold

circuit for spectrum analyzer.

Basic use examples,the last output signal is input into A/D of microprocessor.

Howevwe VCC,GND of analog series had better be common with VCC,GND of

maicroprocessor. THe maicroprocessor does groundisolation to analog series.

Amp-C is the input amplifier to reject common-mode signal (noise),

it utilizes effect of common-mode rejection of Amp-D.

(2) BPF/peak hold circuit is setting of 5 band spectrum analyzer

< 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 done general setting of like next.

w0=gm/C

gm:matual condactance of inside amplifier circuit

(It depends on outside resistor of Pin.No.3)

C:inside capacitor

Q=(R1+R2)/R1 ; it is fixed by inside resistor ratio.

(The design value is 3.5)

(3) The hold capasitor of peak hold circuit use inside capasitor.

When a selection of hold output is over the reset signal of hold value,

The reset signal is made automatically.

(Discharge pulse : -3dBtyp. output value fall)

(4) Output voltage of peak hold circuit is Vcc/2(Pin.No1)

When it is selected by the optput select circuit, it is converted into the voltage

of GND standard and outputs it in PHout (Pin.No.15).

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