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MITSUBISHI SOUND PROCESSORS
M61506FP
Peak hold IC for 5 band spectrum analyzer displays
DESCRIPTION
The M61506FP is a 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. Discharge time constant circuit for each band is on the chip. Single 5V power supply.
RECOMMENDED OPERATING CONDITIONS
Supply voltage range Rated supply voltage 4.5 to 6.5V 5.0 V
SYSTEM BLOCK DIAGRAM
Audio signal
BPF5 Peak BPF5 Peak Peak BPF5 Hold5 Peak BPF5 Hold5 Peak BPF5 Hold5 Hold5 Hold5
Peak
SELECTOR
Hold output
-com interface
SELA
SELC SELB ENB
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BLOCK DIAGRAM
Vcc/2
1
Vcc/2 Gen.
16 GND2
VREF
2
V REF Gen.
SELECTOR
15 PHOUT
(VccX0.3)
IREF I REF Gen.
TEST
3
14 GND1
BPF IN
DIFOUT
HOLD OUTPUT 13 ENB
f1 BPF 1
4
2K + 2K
P.HOLD P.HOLD 12 SELC P.HOLD P.HOLD 11 SELB P.HOLD
AmpD f2 BPF 2 f3 BPF 3
COUT
5
AmpC
+
f4 BPF 4 CNF
6
f5 BPF 5
AOUT
7

2K
10 SELA
Amp-A
+
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)
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FUNCTIONAL DESCRIPTION
(1)The audio signal amplified by Amp-A and Amp-D into BPF/peak hold circuit for spectrum analyzer display. Because the last output signal inputs into A/D of microprocessor. The Vcc,GND had better be common with Vcc,GND of A/D of maicroprocessor. It untilizes effect of common-mode rejection of Amp-D.Amp-C is the input amplifier to reject common-mode signal(noise).To get to good ground isolation.
(2)BPF/peak hold circuit is fit for 5 band spectrum analyzer display. 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 0=gm/C gm:matual condactance of inside amplifier circuit (It depends on outside resistor value of Pin.No.3) C:inside capacitor Q=(R1+R2)/R1:it is fixed by inside resistor ratio. (The design value of Q is 3.5) (3)The hold capacitor of peak hold circuit is included. The reset(discharge) signal is made automatically after ending the output of hold value(Discharge pulse effect:-3dB(typ).fall refer to output value)
(4)The internal output voltage of peak hold circuit is refered to Vcc/2. (Pin.No.1) When it is selected by the output select circuit,it appear at PHout (Pin.No.15) refered to GND.
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PIN DESCRIPTION
PIN No.
Name
Vcc/2 VREF IREF DIFOUT 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
1/2Vcc bias 0.3Vcc bias
Function
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
BPF center frequency setting current terminal Output of amplifier-D(BPF input signal) Output of amplifier-C Inverted input of amplifier-C Output of amplifier-A Inverted input of amplifier-A System supply Output setting control terminal A(logic input) Output setting control terminal B(logic input) Output setting control terminal C(logic input) Output setting control enable terminal(logic input) Ground 1 Peak hold output terminal Ground 2
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PIN No.
Name Vcc/2 VREF IREF DIFOUT COUT CNF AOUT ANF Vcc SELA SELB SELC ENB GND1
I/O I I I O O I 6 Vcc 180K 1 180K GND2
Peripheral circuit of pins
1 2 3 4 5 6 7 8 9 10 11 12 13 14
350K 2 3 150K
Vcc/2
2K
5 4
2K
O 8 I I I 10,11,12,13 I 20K I I I Ground1 10K VccX0.3 VccX0.3 Supply Vcc/2
2K
7
15
PHOUT
O
10K GND2 Ground2
15
16
GND2
I
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ABSOLUTE MAXIMUM RATINGS
Symbol Vcc(max) P d K Topr Tstg Vi(max) Vo(max) Parameter Supply Voltage Power dissipation Thermal derating Operating temperature Storage temperature Input voltage range Output voltage range Thermal derating(maximum rating)
0.6 0.54
Conditions
Ratings 7
Unit V mW mW/ C C C V V
Ta<25 = Ta>25
C C
540 5.4 -20 to +75 -40 to +125
GND-0.3 to Vcc+0.3
GND to Vcc
0.5 0.4 0.3 0.2 0.1 0 0 25 50 75 100 125 150
0.27
AMBIENT TEMPERATURE Ta (
C)
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Recommended operating conditions
(Ta=25 C unless otherwise noted) Parameter Supply voltage Logic input H level voltage Logic input L level voltage
Symbol
Conditions
MIN 4.5
TYP 5.0
MAX 6.5 VCC 0.5
Unit V V V
Vcc VIH Vcc=5V
2.5
VIL
Vcc=5V
GND
(Note 1) The center frequency characteristics of BPF are determined by the resistor connected between 3pin terminal and GND.If it is necessary,adjust the resistor value(note:all bands will be shifted together). The Q of BPF is fixed in 3.5 by inside circuit. (Note 2) The internal output resistor of peak hold output(PIN 15)is 10kW typ. The input resistance of the microprocessor must be much larger than 10k W . (Note 3) The control voltage from the microprocessor must be from GND -0.3V to Vcc+0.3V. If the control voltage is out of the above range. Its necessary to modify the control voltage in the above range by using resistors or diodes.
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OUTPUT CONTROL SPECIFICATION

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
X:Dont Care
'H'=low level,'1'=high level,'X'='0'or'1' The output setting time is more than 10sec. (When the output setting time is short,the output value and reset signal become unstable)
90%
PHout Ts(10Sec.MAX) fn SELECT (internal signal)
Units resistance: capacitance:F
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OUTLINE
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