Mitsubishi M62457FP Datasheet
MITSUBISHI SOUND PROCESSOR ICs
for
spectrum analyzer displays.
• Single 5V power supply.
CD radio cassette players , mini-component stereo systems, car stereos
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
DESCRIPTION
The M62457FP is 5 band peak hold ICs that use
microprocessor time division to produce serial output
FEATURES
• 5 band peak hold elements for spectrum analyzer
displays.
• Discharg time constant circuit for each band is on the
chip.
APPLICATION
RECOMMENDED OPERATING CONDITIONS
Supply voltage range • • • • 4.5 to 6.5V
Rated supply voltage • • • • 5.0V
PIN CONFIGURATION (TOP VIEW)
Vcc/2
VREF
IREF
DIFOUT
COUT
CNF
AOUT
ANF
1
2
3
4
5
6
7
16
15
14
13
12
11
10
98
GND2
PHOUT
GND1
ENB
SELC
SELB
SELA
Vcc
Outline 16P2N-A
SYSTEM BLOCK DIAGRAM
Audio
signal
BPF5
SELA
µ-com
interfac
SELB
PeaK
Hold5
SELC
SELECTOR
Peak
Hold
output
ENB
1
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MITSUBISHI SOUND PROCESSOR ICs
Peak hold IC for 5 band spectrum analayzer displays
PIN CONFIGURATION AND IC INTERNAL BLOCK DIAGRAM
M62457FP
Vcc/2
VREF
IREF
DIFOUT
COUT
1
2
3
4
5
Amp-C
Vcc/2 Gen.
V REF Gen.
(VCC X 0.3 )
I REF Gen.
BPF IN
Amp-D
+
+
HOLD
OUTPUT
BPF 1
BPF 2
BPF 3
SELECTEOR
P.HOLD
P.HOLD
P.HOLD
TEST
16
15
14
13
12
GND2
PHOUT
GND1
ENB
SELC
CNF
AOUT
ANF
BPF 4
6
BPF 5
P.HOLD
P.HOLD
11
SELB
<PEAK HOLD>
SELA
7
Amp-A
+
HOLD C RESET
8
10
9
Vcc
(Notes)f1=105Hz,f2=340Hz,f3=1KHz,f4=3.4KHz,f5=10.5KHz
(The value is the design value)
( / 12 )
2
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
Functional description
(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
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PIN DESCRIPTION 1
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
PIN No.
1
2
3
4
5
6
7
8
9
10
Name
Vcc / 2
VREF
IREF
DIFOPUT
COUT
CNF
AOUT
ANF
Vcc
SELA
I / O Function
I
I
I
O
O
I
O
I
I
I
1/2Vcc supply terminal
0.3Vcc supply terminal
BPF center frequency setting current terminal
Output of amplifier (BPF input signal )
Output of amplifier for analog COM series
Inverted input of amplifier for analog COM series
Output of amplifier for analog signal series
Inverted input of amplifier for analog signal series
System supply terminal
Output setting control terminal A ( logic input )
11
12
13
14
15
16
SELB
SELC
ENB
GND1
PHOUT
GND2
O
I
I
I
I
I
Output setting control terminal B ( logic input )
Output setting control terminal C ( logic input )
Output setting control enble terminal ( logic input )
Ground1 ( it is assumed in the voltage same as PIN16 )
Peak hold outout terminal
Ground2 ( signal series )
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4
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