Mitsubishi M62457 Peak hold ic for 5 band spectrum analayzer display Datasheet

MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
DESCRIPTION
PIN CONFIGURATION (TOP VIEW)
The M62457FP is 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.
• Discharg time constant circuit for each band is on the
chip.
• Single 5V power supply.
Vcc/2
1
16
GND2
VREF
2
15
PHOUT
IREF
3
14
GND1
DIFOUT
4
13
ENB
COUT
5
12
SELC
CNF
6
11
SELB
AOUT
7
10
SELA
ANF
8
9
Vcc
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
BPF5
PeaK
Hold5
Peak
Hold
output
µ-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.
VREF
2
V REF Gen.
16 GND2
15 PHOUT
SELECTEOR
(VCC X 0.3 )
IREF
3
BPF IN
DIFOUT
TEST
I REF Gen.
14 GND1
HOLD
OUTPUT
13 ENB
4
Amp-D
BPF 1
P.HOLD
BPF 2
P.HOLD
+
COUT
12 SELC
5
Amp-C
BPF 3
P.HOLD
BPF 4
P.HOLD
+
CNF
11 SELB
6
BPF 5
AOUT
P.HOLD
<PEAK HOLD>
7
10 SELA
Amp-A
+
ANF
8
HOLD C RESET
9
Vcc
(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
I/O
Function
1
Vcc / 2
I
1/2Vcc supply terminal
2
VREF
I
0.3Vcc supply terminal
3
IREF
I
BPF center frequency setting current terminal
4
DIFOPUT
O
Output of amplifier (BPF input signal )
5
COUT
O
Output of amplifier for analog COM series
6
CNF
I
Inverted input of amplifier for analog COM series
7
AOUT
O
Output of amplifier for analog signal series
8
ANF
I
Inverted input of amplifier for analog signal series
9
Vcc
I
System supply terminal
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 enble terminal ( logic input )
14
GND1
I
Ground1 ( it is assumed in the voltage same as PIN16 )
15
PHOUT
O
Peak hold outout terminal
16
GND2
I
Ground2 ( signal series )
( 4 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
PIN DESCRIPTION 2
PIN No.
Name
I/O
1
Vcc / 2
I
Vcc
2
VREF
I
180K
1
180K
3
IREF
I
4
DIFOPUT
O
5
COUT
O
6
CNF
I
7
AOUT
O
8
ANF
I
9
Vcc
I
10
SELA
I
11
SELB
I
12
SELC
I
13
ENB
I
14
GND1
I
15
PHOUT
O
16
GND2
I
Peripheral circuit of pins
350K
2
3
150K
GND2
Vcc/2
6
5
4
Vcc/2
8
7
10,11,12,13
VccX0.3
20K
10K
VccX0.3
10K
GND2
15
( 5 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
ABSOLUTE MAXIMUM RATINGS
Symbol
Vcc(max)
Parameter
Ratings
Conditions
7
Supply Voltage
Unit
V
Pd
Power dissipation
Ta ≤ 25°C
540
mW
K
Thermal derating
Ta > 25°C
5.4
mW/°C
Topr
Operating temperature
Tstg
Vi(max)
Vo(max)
Storage temperature
-20 to +75
°C
-40 to +125
°C
Allowable input
voltage range
GND-0.3 to Vcc+0.3
V
Allowable output
voltage range
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
125
150
AMBIENT TEMPERATURE Ta [ °C ]
( 6 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
Recommended oprating conditions
(
Ta=25°C unless otherwise noted )
Parameter
Supply voltage
Symbol
Conditions
Vcc
MIN
TYP
MAX
4.5
5.0
6.5
V
Unit
Logic input H
level voltage
VIH
Vcc=5V
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 10KΩtyp.
You do the input resistor of microprocessor side in a value fully big
for 10KΩ.
(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)
ENB
SELA
SELB
SELC
Note
GND(output stop)
0
X
X
X
Don`t Care
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
< Note1 >
”0”=low level,”1”=high level,”X”=”0”or ”1”
< Note2 >
you hold the output setting stare by more than 30µSec for a long time
(When the output setting stare is short, movement of output value and reset
signal become instable )
90%
PHout
Ts(30µSec.MAX)
fn SELECT
(inside signal)
< SELECT state >
fn RESET
(inside signal)
< Outbreak automatic by inside circuit .>
Tr(25µSec.TYP)
( 8 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
Timing chart
H
ENB
L
H
SELA
X
X
X
X
X
X
L
H
SELB
L
H
SELC
L
PH OUT
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
( 9 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
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
Limis
Min
No signal, No select
(ENB,SELA,SELB,SELC=0)
Circuit current
Icc
Maximum output level
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
2.5
Logic input L level
VIL
GND
-0.3
Common-mode rejection ratio
CMRR
2.7
typ
Max
8
13
Unit
mA
V
3.5
30
60
5.0
Vcc
+0.3
V
0
0.5
V
25
50
mV
dB
f1 output level
Vo1
f1 (fin=105Hz)
0.5
1.0
1.70
V
f2 output level
Vo2
f2 (fin=340Hz)
0.5
1.0
1.70
V
f3 output level
Vo3
f3 (fin=1KHz)
0.5
1.0
1.70
V
f4 output level
Vo4
f4 (fin=3.4KHz)
0.5
1.0
1.70
V
f5 output level
Vo5
f5 (fin=10.5KHz)
0.5
1.0
1.70
V
Output response time
Ts
The time from the rise of output
selection until the rise of
PHout(90% of peak)
Discharge level
DS
< Reference >
Inside reset signal
Tr=25µsecTYP
20
-3
30
µsec
dB
( 10 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
TEST CIRCUIT
Vcc/2
16
Vcc/2 Gen.
1
0.1µ
GND2
VREF
PHOUT
2
V REF Gen.
0.1µ
SELECTEOR
15
1M
(Vccx0.3)
IREF
I REF Gen.
3
100K
14
GND1
HOLD
OUTPUT
BPF IN
DIFOUT
13
4
BPF 1
P.HOLD
BPF 2
P.HOLD
BPF 3
P.HOLD
BPF 4
P.HOLD
BPF 5
P.HOLD
Px4
ENB
Amp-D
+
COUT
12
5
Amp-C
100K
IN
SELC
+
CNF
0.47
11
6
39K
AOUT
<PEAK HOLD>
10
Amp-A
100K
ANF
AIN
8
Px2
SELB
7
0.47µ
Px3
+
Px1
SELA
HOLD C RESET
Vcc
9
39K
0.01µ
10µ
Units resistance; Ω
capacitance; F
(11 / 12 )
MITSUBISHI SOUND PROCESSOR ICs
M62457FP
Peak hold IC for 5 band spectrum analayzer displays
APPLICATION EXAMPLE
Vcc/2
1
16
Vcc/2 Gen.
0.1µ
GND2
VREF
2
V REF Gen.
0.1µ
15
SELECTEOR
PHOUT
(Vccx0.3)
IREF
I REF Gen.
3
100K
14
HOLD
OUTPUT
GND1
A/D
BPF IN
DIFOUT
13
4
BPF 1
P.HOLD
BPF 2
P.HOLD
BPF 3
P.HOLD
BPF 4
P.HOLD
BPF 5
P.HOLD
Px4
ENB
Amp-D
+
COUT
12
5
Amp-C
100K
0.47µ
COM
SELC
+
CNF
MCU
11
6
270K/2
AOUT
<PEAK HOLD>
10
Amp-A
100K
0.047µ
ANF
+
Px1
SELA
HOLD C RESET
Vcc
9
8
0.047µ
Px2
SELB
7
CH1
Px3
270K
CH2
270K
0.01µ
10µ
Units resistance; Ω
capacitance; F
( 12 / 12 )
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