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MITSUBISHI SOUND PROCESSOR ICs
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 for spectrum analyzer displays.
PIN CONFIGURATION (TOP VIEW)
Vcc/2 VREF IREF 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 GND2 PHOUT GND1 ENB SELC SELB SELA Vcc
FEATURES
* 5 band peak hold elements for spectrum analyzer displays. * Discharg time constant circuit for each band is on the chip. * Single 5V power supply.
DIFOUT COUT CNF AOUT ANF
Outline 16P2N-A
APPLICATION
CD radio cassette players , mini-component stereo systems, car stereos
RECOMMENDED OPERATING CONDITIONS
Supply voltage range * * * * 4.5 to 6.5V Rated supply voltage * * * * 5.0V
SYSTEM BLOCK DIAGRAM
SELECTOR Audio signal Peak Hold output
BPF5
PeaK Hold5
-com interfac
SELA
SELB SELC ENB
( 1 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
PIN CONFIGURATION AND IC INTERNAL BLOCK DIAGRAM
Vcc/2
1
Vcc/2 Gen.
16 GND2
VREF
2
V REF Gen. (VCC X 0.3 )
SELECTEOR
15 PHOUT
IREF
3
I REF Gen.
TEST
14 GND1
BPF IN
DIFOUT 4
Amp-D
+
HOLD OUTPUT 13 ENB
BPF 1 BPF 2 P.HOLD P.HOLD
COUT
5
Amp-C
+
12 SELC
BPF 3 BPF 4 P.HOLD P.HOLD
CNF
6
BPF 5 P.HOLD
11 SELB
AOUT
7
Amp-A
+

10 SELA
HOLD C RESET 9 Vcc
ANF
8
(Notes)f1=105Hz,f2=340Hz,f3=1KHz,f4=3.4KHz,f5=10.5KHz (The value is the design value)
( 2 / 12 )
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 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays PIN DESCRIPTION 1
PIN No.
Name
Vcc / 2 VREF IREF DIFOPUT COUT CNF AOUT ANF Vcc SELA SELB SELC ENB GND1 PHOUT GND2
I/O I I I O O I O I I I I I I I O I
Function
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 ) 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 )
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
( 4 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays PIN DESCRIPTION 2
PIN No.
Name
Vcc / 2
I/O I I I Vcc 180K 1 180K GND2
Peripheral circuit of pins
1 2 3 4 5 6 7 8 9 10 11 12 13 14
VREF
350K 2 3 150K
IREF
DIFOPUT
O O I 6 Vcc/2 5
COUT
CNF
4
AOUT
O I I I I I I I
8
Vcc/2
7
ANF Vcc SELA SELB SELC ENB GND1
10,11,12,13 VccX0.3 20K 10K VccX0.3
15 16
PHOUT
O
10K GND2
15
GND2
I
( 5 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays ABSOLUTE MAXIMUM RATINGS
Symbol Vcc(max)
Parameter
Conditions
Ratings
Unit V
Supply Voltage Power dissipation Thermal derating Operating temperature Storage temperature Allowable input voltage range Allowable output voltage range Ta 25C Ta > 25C
7
Pd K Topr
540 5.4 -20 to +75
mW mW/C C
Tstg Vi(max) Vo(max)
-40 to +125 GND-0.3 to Vcc+0.3 GND to Vcc
C V V
THERMAL DERATING (MAXIMUM RATING) 0.6
0.54
0.5 0.4 0.3 0.2 0.1 0 0 25 50 75 100 125 150 AMBIENT TEMPERATURE Ta [ C ]
0.27
( 6 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
Recommended oprating conditions ( Ta=25C unless otherwise noted )
Symbol Conditions MIN TYP MAX Unit
Parameter
Supply voltage
Logic input H level voltage
Vcc Vcc=5V
4.5
5.0
6.5
V
VIH
2.5
VCC
V
Logic input L level voltage
VIL
Vcc=5V
GND
0.5
V
(Note1) The center frequency characteristics of BPF are determined by the resistor connected between 3PIN terminal and GND.If it is necessary,use a variable resistor (note:all band will shift together). Q of BPF is fixed in 3.5 by inside circuit. (note 2) The output resistor of peak hold output(PIN 15) is 10Ktyp. You do the input resistor of microprocessor side in a value fully big for 10K. (note 3) Set up as the control voltage from a microprocessor during GND-0.3V and 5V. If the voltage of tolerance outside is added, conserve it resistance or diode.
( 7 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
Output select logic table
PHout (PinNo.15) GND(output stop) GND f1 ; 105Hz f2 ; 340Hz GND f3 ; 1KHz GND f4 ; 3.4KHz f5 ; 10.5KHz
ENB 0 1 1 1 1 1 1 1 1
SELA X 0 0 0 0 1 1 1 1
SELB X 0 0 1 1 0 0 1 1
SELC X 0 1 0 1 0 1 0 1
Note
Dont Care
< Note1 > "0"=low level,"1"=high level,"X"="0"or "1" < Note2 > you hold the output setting stare by more than 30Sec for a long time (When the output setting stare is short, movement of output value and reset signal become instable )
90%
PHout
Ts(30Sec.MAX) fn SELECT (inside signal) < SELECT state >
fn RESET (inside signal)
< Outbreak automatic by inside circuit .>
Tr(25Sec.TYP) ( 8 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
Timing chart
H ENB L H SELA L H SELB L H SELC L
X
X
X
X
X
X
PH OUT GND 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
f1
f2
f3
f4
f5
( 9 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
ELECTRICAL CHARACTERISTICS
(Ta=25C, Vcc=5.0V,PHout(Pin.No.15) RL=1M unless otherwise noted. VAIN=-30dBV, f=1KHz,ENB(Pin.No.13)=1) Limis Min typ 8 Max 13 Unit
Parameter
Symbol
Condition
Circuit current
Icc
No signal, No select (ENB,SELA,SELB,SELC=0) f1 to f5 Measured at each output (VAIN= -14dBV) 2.7
mA
Maximum output level
Vo
3.5
V
Output offset voltage
Vos
f1 to f5 Measured at each output (No signal,ENB=0/1)
30
60
mV
Logic input H level
VIH
2.5
5.0
Vcc +0.3
V
Logic input L level
VIL
GND -0.3 25 f1 (fin=105Hz) f2 (fin=340Hz) f3 (fin=1KHz) f4 (fin=3.4KHz) f5 (fin=10.5KHz) The time from the rise of output selection until the rise of PHout(90% of peak) < Reference > Inside reset signal Tr=25secTYP 0.5 0.5 0.5 0.5 0.5
0
0.5
V
Common-mode rejection ratio f1 output level f2 output level f3 output level f4 output level f5 output level
CMRR Vo1 Vo2 Vo3 Vo4 Vo5
50 1.0 1.0 1.0 1.0 1.0 1.70 1.70 1.70 1.70 1.70
dB V V V V V sec
Output response time
Ts
20
30
Discharge level
DS
-3
dB
( 10 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays TEST CIRCUIT
Vcc/2 1 0.1
Vcc/2 Gen.
16 GND2
VREF 0.1
PHOUT 2 V REF Gen. (Vccx0.3) SELECTEOR 15 1M
IREF 100K
3
I REF Gen. HOLD OUTPUT BPF IN
14 GND1
DIFOUT
4 BPF 1 Amp-D + COUT 5 Amp-C BPF 3 + CNF 6 BPF 4 BPF 5 P.HOLD P.HOLD BPF 2 P.HOLD P.HOLD
13 ENB
Px4
12 SELC
Px3
100K 0.47
IN
39K
11 P.HOLD SELB
Px2
AOUT 7 100K 0.47 ANF 8 39K + Amp-A
10 SELA HOLD C RESET Vcc 9 Px1
AIN
0.01
10
Units resistance; capacitance; F
(11 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays APPLICATION EXAMPLE
Vcc/2 0.1
1
Vcc/2 Gen.
16 GND2
VREF 0.1
2
V REF Gen. (Vccx0.3)
SELECTEOR
15
PHOUT
IREF 100K
3
I REF Gen. HOLD OUTPUT BPF IN
14 GND1 A/D 13 BPF 1 P.HOLD ENB P.HOLD 12 Px3 Px4
DIFOUT
4 Amp-D + COUT 5 Amp-C BPF 3 + CNF 6 BPF 4 BPF 5 P.HOLD P.HOLD BPF 2
100K 0.47
SELC MCU 11 P.HOLD SELB Px2
COM
270K/2
AOUT 7 100K 0.047 ANF 8 0.047 270K + Amp-A
10 SELA HOLD C RESET Vcc 9 Px1
CH1 CH2
270K
0.01
10
Units resistance; capacitance; F
( 12 / 12 )

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