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參數(shù)資料
| 型號： | M62457FP |
| 廠商： | Mitsubishi Electric Corporation |
| 英文描述： | Peak hold IC for 5 band spectrum analayzer displays |
| 中文描述： | 峰值保持5頻段analayzer顯示芯片 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 131K |
| 代理商： | M62457FP |
Peak hold IC for 5 band spectrum analayzer displays
M62457FP
MITSUBISHI SOUND PROCESSOR ICs
(
/ 12 )
(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).
3
Functional description
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