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M65856SP
Digital Echo with Mic-mixing Circuit
REJ03F0085-0100Z Rev.1.0 Sep.22.2003
Description
The M65856SP is a CMOS IC that has a microphone peripheral circuit and an echo generation circuit for karaoke use, on a single chip. Its Karaoke function makes it ideal for video CDs, mini-compos, CD radio cassette players, VIRs and other similar devices.
Features
* High-performance digital echo circuit using 16-Kbit RAM * Internal Surround function that allows audio from a monaural audio source to be reproduced in pseudo-stereo, and audio from a stereo audio source to be reproduced as surround audio * A mic amplifier with an ALC makes it possible to handle overload input, and the ALC operating voltage can be externally set to the desired value. * Internal dual-line mic volume, echo volume, and echo feedback volume * Internal stereo mic mixing amplifier * Internal functions for karaoke enjoyment (Vocal Cut, Auto Vocal Support) * Interface pin provided for connection to an external key control IC * The clock has an internal current control-type oscillation circuit, and the generation of unnecessary oscillation can be prevented because the clock does not affect anything external to the unit. * Internal Auto Reset circuit that functions when the power supply is turned on * 5 V single power supply
Recommended Operating Conditions
* Operating power supply voltage range: Vcc = 4.5 to 5.5 V Rated power supply voltage range: Vcc = 5 V
Rev.1.0, Sep.22.2003, page 1 of 18
M65856SP
Pin Configuration
MIC SW 1 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 DATA CLOCK LATCH PS2 PS1 VCFIL LOUT ROUT SOURCEOUT KEYCONIN RIN LIN VOL IN LPF2OUT LPF2IN2 LPF2IN1 DAINTOUT DAINTIN DACONT VCC GND
MCLKCONT 2 VALC 3 MIC1IN 4 ALC1 5 MIC1NFIN 6 MIC1OUT 7
MIC1VOLIN 8 MIC2IN 9 ALC2 10 MIC2NFIN 11 MIC2OUT 12 MIC2VOLIN 13 MICOUT 14 LPF1IN1 15 LPF1IN2 16 LPF1OUT 17 ADINTOUT 18 ADINTIN 19 ADCONT 20 REF 21
System Block Diagram
KEY CONTROL IC M65847FP/SP
Lch INPUT
SOURCE SELECTOR L R (L+R)/2 VOCAL CUT
MIX PHASE SHI FTER SURROUND MIX
Lch OUTPUT
Rch INPUT
Rch OUTPUT
ALC
MIC1 MIC VOL MIX ECHO MIC VOL FEEDBACK VOL ECHO VOL MIX
ALC
MIC2
Rev.1.0, Sep.22.2003, page 2 of 18
M65856SP
Description of Pin
Pin no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 Symbol MIC SW MCLKCONT VALC MIC1IN ALC1 MIC1NFIN MIC1OUT MIC1VOLIN MIC2IN ALC2 MIC2NFIN MIC2OUT MIC2VOLIN MICOUT LPF1IN1 LPF1IN2 LPF1OUT ADINTOUT ADINTIN ADCONT REF GND VCC DACONT DAINTIN DAINTOUT LPF2IN1 LPF2IN2 LPF2OUT VOLIN LIN RIN KEYCONIN SOURCEOUT Name Mic switch Oscillator input ALC operating voltage setting Mic 1 input ALC1 control Mic 1 negative feedback input Mic 1 output Mic 1 volume input Mic 2 input ALC2 control Mic 2 negative feedback input Mic 2 output Mic 2 volume input Mic output Low-pass filter 1 input 1 Low-pass filter 1 input 2 Low-pass filter 1 output A/D integrator output A/D integrator input A/D control Reference power supply output Ground Power supply D/A control D/A integrator input D/A integrator output Low-pass filter 2 input 1 Low-pass filter 2 input 2 Low-pass filter 2 output Volume input Left channel line input Right channel line input Monaural input supporting external key control IC Monaural output supporting external key control IC I/O I -- -- I -- I O I I -- I O I O I I O O I -- -- -- -- I I O I I O I I I I O Interface pin for connecting external key control IC Function L: Mic off H: Mic on Internal clock is controlled by external resistor ALC operating voltage is set by applied voltage value Used to connect Mic 1 Used to connect C for setting ALC attack and recovery times Used to set the Mic 1 amplifier gain using external resistor Mic 1 amplifier output C coupling used to reduce noise when volume is switched Used to connect Mic 2 Used to connect C for setting ALC attack and recovery times Used to set the Mic 2 amplifier gain using external resistor Mic 2 amplifier output C coupling used to reduce noise when volume is switched Mixing output of Mic 1 and Mic 2 Pre-filter before A/D conversion for digital echo
Configures an integrator for A/D conversion using external C Determines the constant when ADM-type A/D conversion is applied Used to connect C for 1/2 Vcc output and filter
Determines the constant when ADM-type D/A conversion is applied Configures an integrator for D/A conversion using external C Post-filter before D/A conversion for digital echo
C coupling used to reduce noise when volume is switched
Rev.1.0, Sep.22.2003, page 3 of 18
M65856SP
Description of Pin (cont)
Pin no. 35 36 37 Symbol ROUT LOUT VCFIL Name Right channel line output Left channel line output Vocal Cut filter I/O O O -- Function Mixing output of mic and line systems C connection for low-pass filter that passes frequency components lower than the vocal band through Used to connect a C that configures phase shifter surround Serial path latch input Serial path clock input Serial path data input
38 39 40 41 42
PS1 PS2 LATCH CLOCK DATA
Phase shifter 1 Phase shifter 2 Latch Clock Data
I I I I I
Absolute maximum ratings
Symbol VCC Vi Pd Topr Tstg Item Power supply voltage Input voltage Internal power dissipation Ambient operating temperature Storage temperature Rating 6.0 -0.3 to Vcc+0.3 1.1 -20 to +75 -40 to +125 Unit V V W C C
Recommended Operating Conditions
Symbol VCC VIL VIH Parameter Power supply voltage Input voltage (L level) Input voltage (H level) Measurement conditions Limits Min Pins 40, 41, 42 Pins 40, 41, 42 4.5 0 2.4 Typ 5 -- -- Max 5.5 0.8 VDD V V V Unit
Rev.1.0, Sep.22.2003, page 4 of 18
M65856SP
Block Diagram
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
VCC
22
GND
-COM I/F
PHASE SHIFTER SURROUND
LPF
(L+R) / 2 L R STEREO
D/A
MIC SW
ECHO VOL
ECHO F.BVOL
16kbit SRAM
MAIN LOGIC
MCLK ALC
MIC VOL ALC
MIC VOL LPF A/D
1/2 Vcc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Rev.1.0, Sep.22.2003, page 5 of 18
M65856SP
Electrical Characteristics
(Unless otherwise noted, Vcc = 5 V, f = 1 kHz, Vi = 100 mVrms, Ta = 25C)
Symbol Total Mic amplifier Icc Gvo THD1 THD2 VoALC TAL CAT TAL CRE VoMAX No Zi Mic volume Gv ATTmax THD ViMAX No Gv ATTmax THD VoMAX No Gv VoMAX Td Item Current drawn by the circuit Amplifier bare gain Output distortion Output distortion ALC operating voltage measurement ALC attack time ALC recovery time Maximum output voltage Output noise voltage Input impedance Gain between input/output Maximum attenuation Output distortion Maximum input voltage Output noise voltage Gain between input/output Maximum attenuation Output distortion Maximum output voltage Output noise voltage Gain between input/output Maximum output voltage Delay time Measurement conditions When there is no signal Vo = -17 dBV Vo = -17 dBV, other than ALC operation Vi = -37 dBV, when using ALC operation Measured value = -10 to +30dBV C = 4.7 F C = 4.7 F THD = 10% Rg = 620 , JIS-A At maximum volume At minimum volume At maximum volume THD = 10% JIS-A Volume 0 dB At minimum volume At maximum volume THD = 10% JIS-A THD = 10% Sets delay time using microcomputer Limits Min. -- 44 -- -- -3 25 1.0 1.3 -- 6 -3 -- -- 1.4 -- -3 -- -- 1.1 -- -3 1.1 88.4 117.9 132.6 176.9 THD Output distortion Td = 104.0 mS, 30 kHzLPF Td = 138.7 mS, 30 kHzLPF Td = 156.0 mS, 30 kHzLPF Td = 208.1 mS, 30 kHzLPF No Output noise voltage Vi = 0mVrms, JIS-A Td = 104.0 mS, Rg = 620 Vi = 0mVrms, JIS-A Td = 138.7 mS, Rg = 620 Vi = 0mVrms, JIS-A Td = 156.0 mS, Rg = 620 Vi = 0mVrms, JIS-A Td = 208.1 mS, Rg = 620 -- -- -- -- -- -- -- -- Typ. 40 47 0.5 3.0 0 40 1.5 1.4 -68 10 0 -72 0.15 1.7 -96 0 -72 0.15 1.4 -96 0 1.4 104.0 138.7 156.0 208.1 1.0 1.5 1.5 2.0 -87 -85 -85 -82 Max. 88 50 1.5 6.0 +3 55 2.0 -- -57 16 +3 -67 0.30 -- -90 +3 -67 0.30 -- -90 +3 -- 119.6 159.5 179.4 239.3 2.0 3.0 3.0 4.0 -72 -70 -70 -67 mA dB % % dB msec sec Vrms dBV k dB dBV % Vrms dBV dB dBV % Vrms dBV dB Vrms msec msec msec msec % % % % dBV dBV dBV dBV Unit
Echo volume
Digital echo
Rev.1.0, Sep.22.2003, page 6 of 18
M65856SP
Electrical Characteristics (cont)
Symbol Line Gv THD VoMAX No CS Zi Grej Item Gain between input/output Output distortion Maximum output voltage Output noise voltage Channel separation Input impedance Vocal elimination ratio Vocal Cut 30 kHzLPF THD = 10% JIS-A, MIC SW OFF JIS-A Measurement conditions Limits Min. -3 -- 1.1 -- -- 10 14 Typ. 0 0.02 1.7 -95 -70 20 18 Max. +3 0.04 -- -90 -50 30 -- dB % Vrms dBV dB k dB Unit
Rev.1.0, Sep.22.2003, page 7 of 18
M65856SP
Serial Data Format
This product is controlled by the serial data in the format indicated below. DATA (Pin 42) is read on the rising edge of CLOCK (Pin 41), and the 16 bits of data, which are filled in starting from the right, are loaded on the rising edge of LATCH (Pin 40).
40
LATCH CLOCK
D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15
41
42
DATA
time
Data D0 D1 D2 D3 D4 DO = "L" D5 D6 Source selector Function Digital echo Control contents Used to set the delay time in 4 stages, from 104.0 ms to 208.1 ms Voice multiplex software support Used to set 5 types of multiplex modes: Lch Monaural, Rch Monaural, (L + R) / 2, Vocal Cut, and Stereo Surround using phase shifter; effects can be varied by adjusting external resistor If there is no mic input, this automatically outputs the reference vocal Enables / disables external key control Sets MIC OUT SW to ON or OFF In Test mode and Normal mode, D12 = "L" and D13 = "L" Data is read when D14 = "L" and D15 = "H"; otherwise canceled Data DO D1 D2 D3 D4 DO = "H" D5 D6 Feedback volume Function Echo volume Control contents Used to set the volume in 8 stages, between +3 dB to -15 dB and - Used to set the volume in 5 stages, between -2 dB to - 7 dB and -
D7 D8
Phase shifter surround Auto vocal support Key control passthrough Mic switch
D7 D8
Mic 1 volume
Used to set the volume in 8 stages, between 0 dB to - 18 dB and -
D9
D9
D10
D10
Mic 2 volume
Used to set the volume in 8 stages, between 0 dB to - 18 dB and -
D11
D11 D12
D12, D13
D14 D15
Address
D13 D14 D15 Address Data is read when D14 = "L" and D15 = "H"; otherwise canceled
Rev.1.0, Sep.22.2003, page 8 of 18
M65856SP (Usage Precautions) 1. If the power supply is turned on when DATA (Pin 42), CLOCK (Pin 41), and LATCH (Pin 40) are all "H", the mode switches to the Test mode. Please be aware that the settings in this mode are different from those in the mode following an auto reset. 2. After the serial data has been input in the Test mode, the mode is canceled on the rising edge of LATCH (Pin 40), and returns to the normal (Standard) mode.
Test mode Normal mode
40
LATCH CLOCK DATA
"H"
41
"H"
42
"H" D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 D12 D13 D14 D15
time
Function Settings
Delay time settings
Data D0 D3 L L L H H H D2 L H L H H D1 -- -- -- L H 104.0 ms 138.7 ms 156.0 ms 208.1 ms Delay OFF L Delay time
Source selector
Data D0 D6 L L L H H D5 L L H L H D4 L H -- -- -- Lch, Monaural Rch, Monaural (L + R) / 2 Vocal Cut Stereo Source selector
Phase shifter surround settings
Delay time D0 L D8 L L H H D7 L H ON L H Effect (medium) Effect (large) Phase shifter surround Surround switch OFF Effect Effect (small)
Auto vocal support switch
Data D0 L D9 L H Auto vocal support switch OFF ON
Rev.1.0, Sep.22.2003, page 9 of 18
M65856SP Input selector switch
Data D0 L D10 L H External key control supported (Note) External key control not supported (pass-through) Setting
Mic mixing switch
Data D0 L D11 L H OFF ON Mic mixing OFF Mic mixing ON MIC SW Setting
Note: Only monaural signals are supported as output signals to external key control (Pin 34: SOURCEOUT), so when external key control is supported, the D4 to D6 source selectors should be set to a setting other than "Stereo". (If set to "Stereo", external key control will not be supported.)
Volume Settings
Echo volume settings
Data D0 D3 L L H L L H H H H D2 L L H H L L H H D1 L H L H L H L H +3 0 -3 -6 -9 -12 -15 - H Setting (dB)
Echo feedback volume settings
Data D0 D6 L L L L H D5 L L H H L D4 L H L H L -2 -3 -5 -7 - Setting (dB)
Mic volume settings
Data D0 D9 D12 L L H L L H H H H D8 D11 L L H H L L H H D7 D10 L H L H L H L H MIC1 volume MIC2 volume 0 -3 -6 -9 -12 -15 -18 - Setting (dB)
Address settings
Data D0 L, H D15 L L H H D14 L H L H Data Read Data Cancel Data Cancel Address
Rev.1.0, Sep.22.2003, page 10 of 18
M65856SP
Explanation of Functions
(1) Auto reset When the power supply is turned on, a reset is carried out automatically, and after approximately 120 ms (Vcc = 5 V, REF pin C = 47 F), the function settings are set as described below. * * * * * * * * * Delay time setting: 104.0 ms Source selector: Stereo Phase shifter surround setting: OFF Auto vocal support switch: OFF Key control pass-through: External key control supported Mic mixing switch: OFF Echo volume: - Feedback volume: - Mic volume setting: -9 dB
*1. Reset time The reset time is determined by the values of the resistor in the IC and the capacitor C attached to the REF pin. It can be determined using the following equation.
Reset time (msec) = 2.5 x C (F) Example) When C = 47 F Reset time = 2.5 x 47 = 117.5 (msec) This results in a reset time of approximately 120 msec
(2) Auto mute function When the power supply is turned on or when the delay time setting is switched, the auto mute function is activated in order to suppress the shock noise of the digital delay. * When the power supply is turned on
Reset time
* When the delay time setting is switched
Mute time (400msec)
Delay signal prior to switch
Delay signal after switch
Mute time (400msec)
Rev.1.0, Sep.22.2003, page 11 of 18
M65856SP (3) Clock oscillation circuit This IC incorporates a current control-type oscillation circuit. The oscillation circuit can be configured simply by connecting a resistor for current control to Pin 2 (MCLKCONT). Moreover, the clock is completely internal, so the generation of unnecessary oscillation can be prevented because the clock does not affect anything external to the circuit. The oscillation frequency is fck = 2 MHz (Rc = 47 k)
Rc
DC current 2 Oscillation circuit
Clock frequency: fck
(4) Mic amplifier The gain Gv and low-pass cutoff frequency fcl of the mic amplifier are expressed as follows:
Gv=20log *
R1+1.5K+334K R1+1.5K
fcl=
1 2 * (R1+1.5K) * C1
Gv (max) = 47 dB, fcl = 48.2 Hz R1 = 0 , C1 = 2.2 F
As one example of the various constants, v = 37 dB and fcl = 15.1 Hz, then R1 = 3.3 K and C1 = 2.2 F.
REF 1F MIC 10k 1.5k
6 7 4
10k (typ)
334k
R1 C1
Rev.1.0, Sep.22.2003, page 12 of 18
M65856SP (5) ALC level diagram
Vo(dBV) ALC operating voltage setting range 10 +3 0 - 10 - 20 - 30 - 70 - 60 - 50 - 40 - 30 - 20 - 10 Vi(dBV) Mic amplifier gain 47 dB set value
(6) ALC operating voltage setting The ALC operating voltage may be set to any desired value within a range of -10 dBV to +3 dBV, depending on the value of the direct current voltage applied to Pin 3 (ALC operating voltage setting).
2.5V( 1 Vcc )
2
Internal direct current bias Peak voltage Vpo of wave height on one side VALC: Voltage applied to Pin [3] OV
VALC= 2 Vcc- Vpo
1
Example showing the ALC operating voltage set to -5 dB (when Vcc = 5 V) -5 dBV = 0.56 Vrms = 1.59 Vp-p = 0.8 Vp-o VALC = 2.5 - 0.8 = 1.7 V Because of the high input impedance of Pins 5 and 10, which exceeds 1 M, the ALC reference voltage can be applied by splitting the resistance.
Vcc 51k 3 R 0.01
at Vcc = 5 V:
ALC operating voltage (dBV) +3 0 -2 -4 -6 -8 -10 Voltage VALC (V) applied to Pins 5 and 10 0.50 1.09 1.38 1.61 1.79 1.94 2.05 Resistance R () 5.6 k 15 k 20 k 24 k 27 k 33 k 36 k
Rev.1.0, Sep.22.2003, page 13 of 18
M65856SP (7) Digital echo input/output low-pass filter The digital echo input/output low-pass filter is configured as shown below.
C2:1000pF 2.2
14 15
C1:4700pF
16 17
24k 24k 24k Input Output
The precision of the resistance in the IC is approximately 30%. The cutoff frequency (fc) is as follows: fc= 1 2 x 24k x C1 X C2 = 1 2 x 24k x 4700pF x 1000pF 3.1KHz
The quality factor (Q) is as follows: Q= 1 3 C1 C2 0.72
(8) Auto Vocal Support When the Karaoke function is used, and when the Audio Signal Source selector is set to "Lch Monaural" (to eliminate the vocal component when multiplex voice software is being used) or "Vocal Cut" (to eliminate the vocal component of ordinary music software), with no voice being input from the microphone, the Auto Vocal Support function is used to output the vocal component of the audio source to provide vocal support.
Presence of mic input signal Yes No Source selector setting Lch Monaural (L+R) / 2 Vocal Cut (L+R) / 2 Stereo Rch Monaural (L + R) / 2 Same as when there is mic input
Rev.1.0, Sep.22.2003, page 14 of 18
M65856SP Timing at which the presence/absence of a mic input signal is detected
Mic volume input signal
Reference level (REF + 125 mV)
Level detection
Release time 1.5 s
Attack time 40 ms
Judgment as to whether there is a mic input signal
On
OFF
On
(9) Vocal Cut This eliminates the vocal component from ordinary music sources (stereo). Normally, the vocal component occupies a center fixed position, and is input to the L and R channels at the same phases and same amplitude. Consequently, Lch - Rch can be used to cut the vocal component. In this case, however, the low-pass region of music with no sense of a fixed position is also eliminated, so a low-pass filter has to be used to pass the low-pass component through to augment what is missing acoustically.
Lch INPUT
Vocal Cut block
Rch INPUT 37 C 0.15 =53.0Hz
OUTPUT
fvc=
1 2 CR
The low-pass filter is configured of an internal resistor R (20 k) and an external capacitor C. If C = 0.15 F, the cutoff frequency will be 53 Hz.
Rev.1.0, Sep.22.2003, page 15 of 18
M65856SP (10) Phase shifter block
Lch INPUT
Phase shifter surround circuit
38 C (external) = 0.022 F 39
Lch OUTPUT
Rch INPUT
Rch OUTPUT
Source selector L R (L+R) / 2 Vocal Cut Stereo
Surround
Pseudo-stereo
Stereo surround
Rev.1.0, Sep.22.2003, page 16 of 18
M65856SP
Application Example
KEY CONTROL M65847FP/SP
Vcc
100 0.0047 0.1
0.022
NP
0.15 1 1 1 1 2.2 0.001
K
0.068
K
0.1
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
VCC
22
GND
-COM I/F
PHASE SHIFTER SURROUND
LPF
(L+R) / 2 L R STEREO
D/A
MIC SW
ECHO VOL
ECHO F.BVOL
16kbit SRAM
MAIN LOGIC
MCLK ALC
MIC VOL ALC
MIC VOL LPF A/D
1/2Vcc
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
56k
47 4.7 2.2 4.7 1.0 2.2 1.0 1.0 2.2
MIC SW Vcc Vcc
1.0
NP NP
0.001 0.0047
0.068
K
0.1
NP
10k
K
10k
51k
MIC1IN
MIC2IN Unit R: C: F
0.01 22k
Note: Where capacitors are marked with a "K", K-rank capacitors should be used. Where capacitors are marked with "NP", capacitors with no polarity should be used.
Rev.1.0, Sep.22.2003, page 17 of 18
M65856SP
42P4B
JEDEC Code -- Weight(g) 4.1 Lead Material Alloy 42/Cu Alloy
MMP
Plastic 42pin 600mil SDIP
EIAJ Package Code SDIP42-P-600-1.78
c
Package Dimensions
E
1
21
Symbol
D
L
A
e SEATING PLANE
b1
b
b2
A1
A2
A A1 A2 b b1 b2 c D E e e1 L
Dimension in Millimeters Min Nom Max -- -- 5.5 0.51 -- -- -- 3.8 -- 0.35 0.45 0.55 0.9 1.0 1.3 0.63 0.73 1.03 0.22 0.27 0.34 36.5 36.7 36.9 12.85 13.0 13.15 -- 1.778 -- -- 15.24 -- 3.0 -- -- 0 -- 15
e1
Rev.1.0, Sep.22.2003, page 18 of 18
42 22
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