M65845_技术文档

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

DIGITAL

ECHO

ALC

MIC VOL

ECHO VOL

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MITSUBISHI SOUND PROCESSOR ICs

M65845AFP

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

IC INTERNAL BLOCK DIAGRAM

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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

POWER SUPPLY

VCC

D/A CONTROL

ADM A/D adaptive control

DACONT

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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

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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

5

5.5

1

Vcc

33,34PIN

ViH

4

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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

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

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

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

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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

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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

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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

H

L

Lch monaural

Rch monaural

vocal cut

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

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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

24kW

C13

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MITSUBISHI SOUND PROCESSOR ICs

M65845AFP

DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT

COMPATIBILITY WITH 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

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

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

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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

LLINEOUT

RLINEOUT

LLINEIN

Lout

MIC2NFIN

MIC2OUT

MIC2VOLIN

MICOUT

LPF1IN

8

9

2.2µ

1µ

Rout

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

47µ

VCC

GND

0.1µ

100µ

Feed Back

0.15µ

50k

Units Resistance :W

Capacitance:F

MITSUBISHI

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型号：	M65845
厂家：	Mitsubishi Group
描述：	DIGITAL ECHO WITH MICROPHONE MIXING CIRCUIT DIGITAL ECHO带麦克风混合电路混合电路
文件：	总15页 (文件大小：113K)
中文：	中文翻译
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