M65845AFP [MITSUBISHI]
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT; DIGITAL ECHO带麦克风混合电路型号: | M65845AFP |
厂家: | Mitsubishi Group |
描述: | DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT |
文件: | 总15页 (文件大小:113K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
DESCRIPTION
The M65845AFP is a CMOS IC built-in Digital Echo function with microphone
peripheral circuits for "Karaoke" equipment packed in a single chip.
It is suitable for "Karaoke" equipments such as Video CD Player,Mini Stereo,
CD-Radio cassette,TV or VCR.
Being pin compatible with the M65845FP,the M65845AFP is suitable for
upgrading the series.
PIN CONFIGURATION
FEATURES
VOCAL CUT FILTER
MIC1 INPUT
1
2
36
ALC SUPPLY VOLTAGE
CONTROL
ALC1 CONTROL
35
34
AUDIO SW2
•High performance digital echo circuit thanks to 16Kbit
memory
•Two microphone-mixing lines,vocal cut circuit,digital echo, and
line-mixing amplifier are contained,enabling single-
chip package of microphone peripheral circuit of "Karaoke"
equipment.
MIC1 NF INPUT
MIC1 OUTPUT
3
4
33 AUDIO SW1
32
MIC1 VOLUME INPUT
MIC2 INPUT
5
6
CLOCK CONT
31 MIC SW
30
ALC2 CONTROL
MIC2 NF INPUT
7
8
MICECHO OUTPUT
29 Lch LINE OUTPUT
28
MIC2 OUTPUT
9
Rch LINE OUTPUT
MIC2 VOLUME INPUT
27 Lch LINE INPUT
10
•ALC-equipped microphone amplifiers permit excessively
high-input. ALC operating voltage can be set as desired.
•Vocal cut circuit of complete stereo construction
•Compatibility with the M65845FP
•Built-in current-control oscillation circuit
•Built-in automatic reset circuit activated with power on
•Single power supply (5V)
MIC OUTPUT 11
LOWPASS FILTER1 INPUT
26 Rch LINE INPUT
25 ECHO VOLUME INPUT
12
LOWPASS FILTER1 OUTPUT 13
A/D INTEGRAL INPUT 14
24 LOWPASS FILTER2 OUTPUT
23 LOWPASS FILTER2 INPUT
A/D INTEGRAL OUTPUT 15
A/D CONTROL 16
22 D/A INTEGRAL OUTPUT
21 D/A INTEGRAL INPUT
REFERENCE 17
GND 18
20 D/A CONTROL
19 POWER SUPPLY
36P2R
RECOMMENDED OPERATING CONDITION
Supply voltage range••••••••••Vcc=4.5~5.5V
Rated supply voltage•••••••••• Vcc=5V
SYSTEM CONFIGURATION
AUDIO SW
Lch
INPUT
SOURCE
SELECTOR
MIX
Lch
L
OUTPUT
R
VOCAL
CUT
MIX
Rch
INPUT
Rch
OUTPUT
ALC
MIC SW
MIC1
MIC2
MIC VOL
MIX
MIX
DIGITAL
ECHO
ALC
MIC VOL
ECHO VOL
MITSUBISHI
ELECTRIC
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MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
IC INTERNAL BLOCK DIAGRAM
MITSUBISHI
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ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
PIN DESCRIPTION
No
1
Pin Name
MIC1 INPUT
Symbol
MIC1IN
ALC1
Function
Connect MIC1
ALC1 CONTROL
Connect C which determine recovery time
Set up MIC1 amp gain for feedback circuit
2
MIC1NFIN MIC1 NF INPUT
3
MIC1OUT
MIC1 OUTPUT
4
Connect microphone volume which turn down
input signal
MIC1VOLIN MIC1 VOLUME INPUT
5
Connect MIC 2
MIC2IN
ALC2
6
MIC2 INPUT
ALC2 CONTROL
MIC2 NF INPUT
Connect C which determine ALC attack ,recovery time
7
MIC2NFIN
8
Forms MIC 2 amp gain with feedback
MIC2OUT MIC2 OUTPUT
9
Connect microphone volume which turn down
input signal
MIC2VOLIN MIC2 VOLUME INPUT
10
MIC OUTPUT
Mixing output with MIC 1 and MIC 2
11
12
13
14
15
16
17
18
19
20
MICOUT
LOWPASS FILTER1
INPUT
LPF1 IN
Forms the front lowpass filter with external
CR for digital echo
LOWPASS FILTER1
OUTPUT
LPF1 OUT
ADINTIN
A/D INTEGRAL INPUT
Forms integrator with external C and R
A/D INTEGRAL
OUTPUT
ADINTOUT
ADCONT
ADM A/D adaptive control
1/2Vcc, connect filter C
A/D CONTROL
REFERENCE
REF
GND
GND
POWER SUPPLY
VCC
D/A CONTROL
ADM A/D adaptive control
DACONT
MITSUBISHI
ELECTRIC
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MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
Symbol
DAINTIN
No
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
Pin name
Function
D/A INTEGRAL INPUT
Forms integrator with external C
D/A INTEGRAL
OUTPUT
DAINTOUT
LPF2 IN
LOWPASS FILTER'2
INPUT
Forms post lowpass filter with external CR
for digital echo
LOWPASS FILTER2
OUTPUT
LPF2 OUT
ECHOVOLIN
RLINEIN
Connect microphone volume which turn down
input signal
ECHO VOLUME
INPUT
Rch LINE INPUT
LLINEIN
Lch LINE INPUT
RLINEOUT Rch LINE OUTPUT
Mixing output with line and microphone
Lch LINE OUTPUT
LLINEOUT
Mixing output with microphone and echo
L; Microphone OFF H; Microphone ON
MIC ECHO OUTPUT
MIC SW
MICECHOOUT
MICSW
Controls built-in clock generation circuit with
external R
CLOCK CONTROL
AUDIO SW1
CLOCK CONT
AUDSW1
Changing source sound signal
AUDIO SW2
AUDSW2
ALC SUPPLY
VOLTAGE CONTROL
Forms ALC operation voltage with control voltage
VALC
VCFIL
VOCAL CUT FILTER Through frequency under vocal level
MITSUBISHI
ELECTRIC
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MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
ABSOLUTE MAXIMUM RATINGS
(Ta=25°C,unless otherwise noted)
Symbol
Parameter
Unit
V
Conditions
Rations
6.0
Supply voltage
Circuit current
Input voltage
Vcc
Icc
Vi
mA
85
-0.3~Vcc+0.3
V
Power dissipation
Pd
860
-20~+75
mW
°C
Operating temperature
Storage temperature
Topr
Tstg
°C
-40~+125
RECOMMENDED OPERATING CONDITION
Limits
Typ
Conditions
Unit
Symbol
Parameter
Min
4.5
0
Max
Supply voltage
L input voltage
H input voltage
Vcc
ViL
V
V
V
5
5.5
1
Vcc
33,34PIN
ViH
4
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ELECTRIC
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MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
ELECTRICAL CHARACTERISTICS
(Vcc=5V,f=1kHz,Vi=100mVrms,fck=2MHz,Ta=25°C ,unless otherwise noted)
Limits
Symbol
Icc
Parameter
Conditions
Typ
Min
25
44
Max
Unit
T/L
No signal
mA
Circuit current
34
70
GVO
Voltage gain
Vo=-17dBV
dB
50
47
THD1
Vo=-17dBV,without ALC
Vi=-27dBV,ALC operate
at -10 ~ +3dBV
Distortion1
0.5 1.5
%
%
THD2 Distortion2
3.0
0
6.0
+3
55
ALC voltage
VoALC
TALCAT
TALCRE
VoMAX
No
dB
ms
s
-3
ALC Attack time
at C=4.7µF
25
40
ALC Recovery time at C=4.7µF
1.0 1.5 2.0
Maximum output voltage
THD=10%
dBV
dBV
kW
-1
2
Gv=47dB,JIS-A,VI=0Vrms
Noise Voltage
input impedance
Delay Time
-68 -57
5
10
20
Zi
Td
Rc=51kW
167 197 226
ms
dB
Voltage gain
Gv
-3.0
-3
0
3.0
Distortion
THD
VoMAX
No
2.0 4.0
1.0
%
Maximum output voltage
THD=10%
JIS-A
dBV
dBV
dB
Noise voltage
Voltage gain
Distortion
-82
0
-67
+3
-3
Gv
0.02 0.1
4
%
THD
VoMAX
No
Maximum output voltage THD=10%
dBV
dBV
kW
1
JIS-A,MICSW=off
Noise voltage
Input impedance
Noise voltage
-97
20
-88
40
10
Zi
JIS-A,Vocal cut ON
No
-95 -72
dBV
Voltage gain
input one side channel
THD=10%
Gv
-3
1
0
4
+3
dB
Maximum output voltage
VoMAX
dBV
GREJ
Vocal rejection ratio
14
18
dB
MITSUBISHI
ELECTRIC
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MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
FUNCTION DESCRIPTION
(1) Microphone amplifier
The gain(Gv) and low cut-off frequency(fcl) of microphone amplifier are expressed
as follows.
REF
R1+1.5K+334K
R1+1.5K
1
fcl=
Gv=20log•
2p•(R1+1.5K)•C1
10kW(typ)
1µF
2
MIC
Gv(max)=47dB,fcl=50Hz
R1=0W,C1=2.2µF
5kW
334kW
Assuming Gv=37dB, fcl=15Hz,for instance,
the constants take the following values.
1.5kW
3
4
R1=3.3KW,C1=2.2µF
R1
C1
<< Attention point when M65845FP is replaced with M65845AFP >>
REF
10kW(typ)
R3 and C4 are required for the
M65845FP, not for the M65845AFP.
As mentioned above, the gain of
microphone amplifier can set it up
with R1.
1µF
R2
2
MIC
3
4
C4
R3 and C4 are not required for
the M65845AFP.
R3
R1
C1
R1 for the gain of microphone
amplifier setting in use M65845AFP
Recommended circuit In use M65845FP
( 7 / 15 )
MITSUBISHI
ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
(2) ALC level block diagram
vo(dBV)
10
ALC supply voltage control limits
+3
0
-10
-20
-30
It is set 47dB for microphone amplifier gain.
-60
-50
-40
-30
-20
-10
vi(dBV)
(3) ALC operation voltage control
ALC operation voltage can be formed within the limits of -10 to +3 dBV controlled
by DC control voltage which connect 35 pin.
(Setting up forms)
1
2.5V( Vcc)
2
internal direct bias
half peak
voltage Vpo
35 pin control voltage VALC
0V
1
VALC= Vcc-Vpo
2
When ALC operation voltage is -5dBV
(at Vcc=5V)
-5dBV=0.56Vrms=1.59Vp-p=0.80Vp-o
VALC=2.5-0.8=1.7V
are concerned.
MITSUBISHI
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ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
Input impedance to 35 pin is so high (1MW) that ALC base voltage can be determined
by division resistance.
Vcc
R17(51k)
35
R16
C33(0.01µ )
at Vcc=5V
ALC operation voltage (dBV) 35 pin control voltage VALC (V)
resistance R16 (W)
5.6k
15k
20k
24k
27k
33k
36k
+3
0
0.50
1.09
1.38
1.61
1.79
1.94
2.05
-2
-4
-6
-8
-10
(4) MIC SW
Input low level to 31 pin (MIC SW) ,then microphone and echo signal can be cut.
ECHO SIGNAL
MIC SW
ON
31 pin (MIC SW)
H or OPEN
OUTPUT
ON
MUTE
L
OFF
MITSUBISHI
ELECTRIC
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MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
(5) Audio source select
Changing the switch ,sound source changes four patterns matching with
KARAOKE soft.
33 AUDSW1;D1
34 AUDSW2;D2
Movements
Stereo
L
L
L
H
L
Lch monaural
Rch monaural
vocal cut
H
H
H
1 Stereo
Under the conditions usual 2channels are played back to each outputs.
2 Lch monaural
Under the conditions Lch source is played back to 2ch outputs and suitable for
KARAOKE reproduction of multiple KARAOKE soft and main sound reproduction of
laser disks.
3 Rch monaural
Under the conditions Rch source is played back to 2ch outputs and suitable for
reference vocal reproduction of multiple KARAOKE soft and sub sound reproduction of
laser disks.
MITSUBISHI
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ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
4 Vocal cut
It is a method turned down Lch and Rch input having the same phase and sound .
Lowpass cut off frequency fc is determined by a capacitance which connect to 36 pin
(vocal cut filter).
It is also having a function which through frequency under vocal level for supplying a
lack of low level sound.
Rvc=20k typ
36
C34
1
fc=
2pRvcC34
at fc=50Hz, C34=0.15µF is determined.
Caution; Inside resistance is changeable one by one which rate is ±30%.
MITSUBISHI
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ELECTRIC
MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
(6) Digital Echo
1 Clock oscillator circuit
This IC incorporates a current control type clock oscillator circuit in it, thus providing circuit
configuration just by connecting an Rc for current control pin 32 (CLOCK CONT).
Fully internal clock supply prevents occurrence of undesired radiation without affecting
any external circuit.
The oscillator frequency fck is following.
fck = 2 MHz(Rc=51KW)
Note:
The delay time(Td) for echo is determined by the clock
frequency(fck).
DC Current
Rc
Clock
oscillator
circuit
32
Delay time=1/fckX24XN
(N=the number of memory bits = 16384
fck = 2 MHz(Rc=51KW) : Delay time=197msec
fck = 2.6MHz(Rc=39KW) : Delay time=150msec
fck = 3.9MHz(Rc=24KW) : Delay time=100msec
Clock frequency:fck
2Å@Auto mute function
The IC carries out auto mute function at the time of powering up and switching on
MIC SW in order to suppress shock noise that the digital delay may produce.
•At power up
Mute time
(400msec)
Reset Time
•At switching on MIC SW
MIC SW OFF
Mute time
(400msec)
switching on MIC SW
MITSUBISHI
ELECTRIC
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MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
3 Input and output LPF
Signal through frequency fsig is also determined by LPF of Digital Echo cut off frequency.
2 degree LPF of Digital Echo is formed by external resistance and capacitor .
(refer to next figure) So, cut off frequency is determined by next formula.
1
fsig=
2p
R8 • R9 • C13 • C14
LPF1
REF
LPF2
REF
12
23
24
13
R8
24kW
R8
24kW
C14
R9
C14
R9
R7
R7
24kW
24kW
24kW
24kW
C13
C13
MITSUBISHI
ELECTRIC
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MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
COMPATIBILITY WITH M65845FP
<APPLICATION EXAMPLE IN USE M65845FP>
Units Resistance :W
Capacitance:F
5k
0.15µ
*2
VCFIL
0.22µ
0.01µ
51k
36
35
34
33
MICIN
MIC1
1
4.7µ
VALC
ALC1
2
VCC
0.33µ
2.2k
24k
*1
AUDSW2
AUDSW1
CLOCK
D2
MIC1NFIN
MIC1OUT
MIC1VOLIN
MIC2IN
3
*1
200p
150k
*2
D1
*2
4
0.1µ
*2
39k
0.1µ
32
31
VCC
*1
5k
5
30kW
*2
MICSW
100p
MIC
SW
MIC2
6
7
8
0.22µ
4.7µ
*2
MICECHO
OUT
30
29
28
27
ALC2
0.33µ 2.2k
2.2µ
LLINEOUT
RLINEOUT
LLINEIN
*1
Lout
MIC2NFIN
MIC2OUT
MIC2VOLIN
MICOUT
LPF1IN
2.2µ
200p
150k
*1
Rout
*2
9
0.1µ
*2
1µ
1µ
0.1µ
Lin
10
30kW
*2
Rin
RLINEIN
26
11
12
*2
0.1µ
30kW
*2
0.027µ
15k
10k
15k
ECHO
VOLIN
0.047µ
25
24
23
22
21
20
19
0.1µ
*2
*1
2700p
3k
LPF2OUT
LPF2IN
*1
LPF1OUT
ADINTIN
ADINTOUT
ADCONT
REF
13
15k
2700p
10k
14
15
16
17
18
0.027µ
0.068µ
30
DAINTOUT
DAINTIN
DACONT
VCC
*2
15k
*1
0.068µ
0.22µ
0.22µ
47µ
VCC
GND
0.1µ
100µ
*2
Feed Back
0.15µ
30k
As mentioned above, the M65845AFP can be replaced with the M65845FP
without changing the board.
Note
*1: The components marked with a circle are required for the M65845FP, not for
the M65845AFP.
*2: The M65845AFP is different from the M65845FP a part of the components
marked with a circle.
MITSUBISHI
ELECTRIC
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MITSUBISHI SOUND PROCESSOR ICs
M65845AFP
DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT
APPLICATION EXAMPLE
Microphone amplifier : Gv=47dB,fcl=50Hz
ALC operating voltage -4dBV
ECHO
: Delay time 197ms (fs=83.3kHz)
Cut-off frecuency 3.1kHz
5k
0.15µ
1µ
VCFIL
0.01µ
51k
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
MICIN
MIC1
1
2
4.7µ
VALC
AUDSW2
AUDSW1
VCC
ALC1
2.2µ
24k
D2
D1
MIC1NFIN
MIC1OUT
MIC1VOLIN
MIC2IN
3
4
5
1µ
51k
1µ
CLOCK
CONT
VCC
5k
30kW
MICSW
MIC
SW
MIC2
6
7
4.7µ
1µ
MICECHO
OUT
ALC2
2.2µ
2.2µ
LLINEOUT
RLINEOUT
LLINEIN
Lout
MIC2NFIN
MIC2OUT
MIC2VOLIN
MICOUT
LPF1IN
8
9
2.2µ
1µ
Rout
1µ
1µ
Lin
10
1µ
30kW
RLINEIN
Rin
11
12
24k
30kW
1µ
1000p
24k
0.047µ
24k
ECHO
VOLIN
1µ
1000p
24k
LPF2OUT
LPF2IN
LPF1OUT
ADINTIN
ADINTOUT
ADCONT
REF
13
14
15
16
17
18
24k
0.047µ
0.068µ
DAINTOUT
DAINTIN
DACONT
VCC
24k
0.068µ
0.1µ
0.1µ
47µ
VCC
GND
0.1µ
100µ
Feed Back
0.15µ
50k
Units Resistance :W
Capacitance:F
MITSUBISHI
ELECTRIC
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