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Multimedia ICs
Analog compander with vocal fader for KARAOKE
BA7726AS / BA7726AFS
The BA7726AS and BA7726AFS are analog companders for karaoke echo systems and have internal logarithmic compression and expansion circuits, a stereo line mixer amplifier, vocal fader function, vocal detection function, microphone ALC, microphone ON / OFF switch, and output switch. When used together with the BU9252 8-bit digital delay, these ICs form a high-grade karaoke echo system with minimum components.
*Applications with karaoke functions, VCRs, mini component stereo systems, LD players Portable CD stereos *Features stereo line mixer amplifier, allowing selec1) Internal
tion of through output, left output, or right output. 2) Internal vocal elimination function, suitable for vocal faders and left and right output. 3) Echo level and loop ratio are DC-adjustable with the internal electronic volume control (EVR). 4) Internal microphone ON / OFF switch. 5) Vocal detection. 6) Internal microphone ALC function. 7) Internal anti-popping circuit.
*Absolute maximum ratings (Ta = 25C)
Parameter Power supply voltage Power dissipation Operating temperature Storage temperature Symbol VCC Pd Topr Tstg Limits 14 BA7726AS BA7726AFS 12501 8502 Unit V mW C C
- 10 ~ + 70 - 55 ~ + 125
1 Reduced by 12.5mW for each increase in Ta of 1C over 25C. 2 Reduced by 8.5mW for each increase in Ta of 1C over 25C.
*Recommended operating conditions (Ta = 25C)
Parameter Power supply voltage Symbol VCC Min. 4.5 Typ. 9.0 Max. 12.0 Unit V
1
*Block diagram
2
32 1 31 2 30 3 4 28 5 ALC 6 SW 7 8 9 10 GND 11 ECHO LEVEL CTRL 12 LOOP GAIN CTRL 13 EXP DET 14 EXP DET CT 15 EXP BF IN 16 DLY BF OUT
+-
LINE OUT R
L / ST / R CTRL
Multimedia ICs
OUTSW NO / VC CTRL
LINE OUT L
L / VF / R CTRL
VO DET
29
VOCAL DET
MUTE CTRL
VO DET LEVEL
LINE IN R
ALC DET LEVEL
27
LINE IN L
ALC DET
26
VR
VF LPF1
MIC AMP IN VOCAL FADER
25
VF LPF2
MIC AMP NF
- +
24
VF LPF3
BIAS
23 22
VCC
COMPRESS
VR VR EXPAND
CMP DET
21 20 19
CMP DET CT
CMP OUT
CMP BF NF IN
- +
BA7726AS / BA7726AFS
18 17
CMP BF OUT
DLY BF NF IN
Multimedia ICs
BA7726AS / BA7726AFS
*Pin descriptions
Pin No. 2, 1 3 4 6, 5 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 Pin name LINE OUT L / R L / VF / R CTRL MUTE CTRL LINE IN L / R VF LPF1 VF LPF2 VF LPF3 GND Line output (L, R) Line output switching (LEFT / VOCAL FADER / RIGHT) Line mute control input Line input (L, R) Vocal fader mode LPF capacitor Vocal fader mode LPF capacitor Vocal fader mode LPF capacitor Ground Function Voltage 4.5V 2.5V -- 4.5V 4.5V 4.5V 4.5V 0.0V -- -- 4.5V -- 4.5V 4.5V 4.5V 4.5V 4.5V 4.5V -- 4.5V 9.0V 4.5V 4.5V 4.5V -- -- -- -- -- 2.5V Pin type EF (P - P)

100k 23.5k 70.5k EF (NPN), 15k --
ECHO LEVEL CTRL Microphone off (ground to 0.1Vcc) / echo level adjustment (0.2Vcc to Vcc) LOOP GAIN CTRL EXP DET EXP DET CT EXP BF IN DLY BF OUT DLY BF NF IN CMP BF OUT CMP BF NF IN CMP OUT CMP DET CT CMP DET VCC BIAS MIC AMP NF MIC AMP IN ALC DET ALC DET LEVEL VO DET LEVEL VO DET NO / VC CTRL L / ST / R CTRL Loop attenuation ratio setting Expand detection wave Expand attack / recovery time setting Attack R = 5.6k , recovery R = 85.6k BF input LPF BF output (EXP) LPF BF negative feedback input (EXP) LPF BF output (CMP) LPF BF negative feedback input (CMP) Compression output Compression attack / recover time setting Attack R = 5.6k, recovery R = 85.6k Compression detection wave VCC Bias and capacitor for ripple rejection Microphone amplifier negative feedback Microphone amplifier input ALC attack / recovery time setting ALC level setting Microphone amplifier input detection level setting Microphone amplifier input detection attack / recover time setting Line output switching (NORMAL / VOCAL CUT) Line output switching (LEFT / STEREO / RIGHT)

50k -- B (NPN) EF (NPN) B (NPN) EF (P - P) B (NPN) EF (NPN) -- 60k -- 23.5k 2k 100k 220 B (PNP) B (PNP) 1k

Note: Pin type EF: emitter follower, P-P: push-pull, B: base For pins marked with an asterisk (), refer to Input and output equivalent circuit. All figures are designed values based on the measurement circuit in Fig. 1 (where Vcc = 9.0V), and are not guaranteed standards.
3
Multimedia ICs
BA7726AS / BA7726AFS
*Input / output circuits
L / VF / R CTRL
VCC VCC
MUTE CTRL
39k 3.3V
39k
1.7V 4
39k 2.5V 150k
3
ECHO LEVEL CTRL
LOOP GAIN CTRL
VCC 12 85k 11 39k 39k 0.6 x VCC 0.8 x VCC 0.8 x VCC 15k 0.6 x VCC
NO / VC CTRL
L / ST / R CTRL
VCC VCC 49.5k 39k
31 3.3V 33k
39k
39k
1.7V
32
All figures are designed values, and are not guaranteed standards.
4
Multimedia ICs
BA7726AS / BA7726AFS
*Electrical characteristics (unless otherwise noted, Ta = 25C, Vcc = 9.0V)
Parameter Supply current Symbol ICC Min. 5.5 Typ. 8.4 Max. 12.7 Unit mA No input Conditions
LINE THROUGH INPUT : LINE IN, OUTPUT : LINE OUT
Line through output level Line through output distortion Line through max. output level Line through noise level Interchannel crosstalk VOLL THDLL VOMLL VONLL CTLL - 9.0 -- + 7.8 -- -- - 8.0 0.026 + 10.0 - 100 - 85 - 7.0 0.2 -- - 85 -- dBV % dBV dBV dBV VIN = - 20.0dBV VIN = - 20.0dBV1 MIC OFF (VECHO = 0.1 x VCC) THD = 1%1 No input, Rg = 1k2 MIC OFF (VECHO = 0.1 x VCC) VIN - 12dBV, Rg = 1k2 MIC OFF (VECHO = 0.1 x VCC) VIN = - 12dBV, Rg = 1k2 MIC OFF (VECHO = 0.1 x VCC) MUTE (VMUTE = H)
Mute level
MT
--
- 100
- 85
dBV
VOCAL CUT MODE INPUT : LINE IN, OUTPUT : LINE OUT
Through mode output level Vocal suppression ratio 1 Vocal suppression ratio 2 VOLLV VOLL1 VOLL2 - 1.0 - 1.0 -- 0.0 0.0 - 35 + 1.0 + 1.0 - 28 dBV dB dB VIN = - 12dBV VIN = - 12dBV (single ch. in.),VOCAL FADER (VLSTR = H, VLVFR = OPEN, VNOVC = OPEN) VIN = - 12dBV (dual ch.in.),VOCAL FADER (VLSTR = H, VLVFR = OPEN, VNOVC = OPEN)
MIC THROUGH INPUT : MIC AMP IN, OUTPUT : LINE OUT
Microphone through output level Microphone through equivalent input noise Microphone input crosstalk ALC level VOML VONML CTML VOAML - 9.9 -- -- + 5.1 - 8.4 - 117 - 92 + 6.6 - 6.9 - 102 - 77 + 8.1 dBV dBV dBV dBV VIN = - 38dBV Rg = 1k2 VIN = - 30dBV2 MIC OFF (VECHO = 0.1 x VCC) V28 = 2.9V
COMPRESS INPUT : MIC AMP IN, OUTPUT : CMP BF OUT
Compress output level Compress characteristics VOMC CMP - 5.5 -- - 3.5 + 5.2 - 1.5 -- dBV dB VIN = - 38dBV VIN = - 43dBV - 33dBV Output level differential
EXPAND INPUT : DLY BF IN, OUTPUT : LINE OUT
Expand output level Expand characteristics Echo EVR attenuation ratio VODL EXP VODL - 9.4 -- -- - 7.4 + 19.4 - 50 -- -- - 40 dBV dB dB VIN = - 4dBV VIN = - 9dBV + 1dBV, Output level differential VIN = - 4dBV and when VIN = Vodl ECHO LEVEL = Min. (VECHO = 0.2 x VCC)
Loop INPUT : DLY BF IN, OUTPUT : CMP BF OUT
Loop output level Loop EVR attenuation ratio VODC VODC - 4.4 -- - 2.4 - 29 -- -- dBV dB VIN = - 4dBV VIN = - 4dBV and when VIN = Vodc LOOP GAIN = Min. (VLOOP = 0.2 x VCC)
1
Unless otherwise noted, mode settings are as follows. MUTE (VMUTE = GND), STEREO (VNOVC = GND, VLSTR = OPEN, VLVFR = OPEN) ECHO LEVEL = Max. (VECHO = VCC), LOOP GAIN = Max. (VLOOP = VCC) Signal frequency : 1kHz,
2
1 : B.W. = 0.4 ~ 30kHz, 2 : DIN
AUDIO
All parameters conform to the Measurement circuit diagram.
5
Multimedia ICs
Parameter [ Control holding voltage ] Symbol Min. Typ. Max.
BA7726AS / BA7726AFS
Unit Conditions
MUTE CTRL (4pin)
Mute holding voltage (4pin) Mute holding voltage (4pin) VMUTE - L VMUTE - H VNOVC - L VNOVC - H VLSTR - L VLSTR - M VLSTR - H VLVFR - L VLVFR - M VLVFR - H VECHO - L VECHO - H GND 4.5 GND 0.5 x VCC GND 2.2 4.5 GND 2.2 4.5 GND 0.2 x VCC -- -- -- -- -- -- -- -- -- -- -- -- 0.5 5.0 0.3 x VCC VCC 0.5 2.8 5.0 0.5 2.8 5.0 0.1 x VCC VCC V V V V V V V V V V V V
NO / VC CTRL (31pin)
Normal mode holding voltage VOCAL CUT mode holding voltage
L / ST / R CTRL (32pin)
Left mode holding voltage Stereo mode holding voltage Right mode holding voltage
L / VF / R CTRL (3pin)
Left mode holding voltage VOCAL FADER mode holding voltage Right mode holding voltage
ECHO LEVEL CTRL (11pin)
MIC OFF holding voltage MIC ON holding voltage
6
Multimedia ICs
BA7726AS / BA7726AFS
*Measurement circuit
MIC AMP IN VLSTR VNOVC VCC 9V
5600p 3900p 1k 100 + 0.47 47 0.1 0.1 22 A 1 18k + + + + 18k 47k 39k 3900p 220p 47k 18k 1 + 18k + 1 10k CMP BF OUT DLY BF IN 1k 100k 33
+
1k
32
31
30
29
VOCAL DET
28
2.2M
3.3k
8.2k 6.8k
27
26
VR
25
- +
24
23
22
21
20
19
- +
18
17
ALC
5600p COMPRESS VR VR EXPAND 220p 39k
OUTSW SW
VOCAL FADER
+-
1
2
3
4
0.1
5
0.1
6
7
8
9
10
11
12
13
14
+
15
16
+ + 2.2 2.2 4700p 4700p
0.015 1k 1k 0.068
0.1 0.47
LINE OUT R
LINE IN R
LINE IN L
VMUTE
VECHO
10k
10k
LINE OUT L
Fig. 1
VLOOP
VLVFR
7
Multimedia ICs
BA7726AS / BA7726AFS
*Circuit operation 4) (1) MUTE CTRL (pin
* Controls line muting.
VMUTE (4pin) L MUTE H MUTE
(3) ECHO LEVEL CTRL and MIC ON / OFF SW (pin 11) * Between Vcc and 0.2 x Vcc: Controls echo signal mixing ratio Between Vcc and GND : Turns microphone input sound (pin 26) to LINE OUT on and off
VECHO (11pin) VCC ~ 0.2 x VCC 0.1 x VCC ~ GND MIC OFF
LINE OUT Attenuation. : ATT (dB)
(2) OUTPUT CTRL (pins 3, 31, 32) * LINE OUT output is controlled with pins 3, 31 and 32. (Microphone mixing is controlled with pin 11.) 1) NO / VC CTRL (pin 31) * Used to select the NORMAL and VOCAL CUT modes.
VNOVC (31pin) L NORMAL
NORMAL
MIC ON and ECHO LEVEL CTRL
MIC AMP IN ~ LINE OUT (VIN = - 38dBV, f = 1kHz) 0 DLY BF IN ~ LINE OUT (VIN = - 4dBV, f = 1kHz) - 50
H VOCAL CUT
: Normal output mode. Controlled by pin 32.
VOCAL CUT : Used to erase or attenuate vocals in multiplexed karaoke recordings and normal stereo music recordings. Controlled by pin3.
- 100
0
0.5 VECHO (11pin) P.P ratio : VECHO / VCC
1.0
Fig. 2 LINE OUTattenuation ratio vs. Vecho (11pin) partial pressure ratio
2) L / ST / R CTRL (pin 32) * Controls LINE OUT output in the NORMAL mode.
VLSTR (32pin) L LEFT
LEFT RIGHT
These figures are for standard samples and
are not guaranteed standards.
M (OPEN) STEREO
H RIGHT
(4) LOOP GAIN CTRL (pin 12) * Adjusts the loop gain (pins 17 and 18).
CMP BF OUT Attenuation. : ATT (dB)
: LINE IN L input is output to LINE OUT L / R. : LINE IN R input is output to LINE OUT L / R.
STEREO : LINE IN L / R input is output to LINE OUT L / R without modification
0
DLY BF IN ~ CMP BF OUT (VIN = - 4dBV, f = 1kHz) VCC = 9.0V
3) L / VF / R CTRL (pin 3) * Controls LINE OUT output in the VOCAL CUT mode.
VLVFR (3pin) L LEFT
LEFT
- 25
- 50 0 0.5 VLOOP (12pin) P.P ratio : VECHO / VCC 1.0
M (OPEN) VOCAL FADER
H RIGHT
: For recordings in which the left channel is karaoke and the right channel is for vocals (with karaoke).
Fig. 3 CMP BF OUT attenuation ratio vs. Vloop (pin 12) partial pressure ratio
These figures are for standard samples and
are not guaranteed standards.
VOCAL FADER : Attenuates the vocals from normal stereo recordings. RIGHT : For recordings in which the right channel is karaoke and the left channel is for vocals (with karaoke).
When Vnovc = L, VLVFR = DON ' T CARE
When Vnovc = H, VLSTR = DON ' T CARE
8
Multimedia ICs
(5) LPF * Use the internal operational amplifier and an attached capacitor and resistor to configure a tertiary LPF for anti-aliasing and smoothing.
C1 R1 R1 R2 C2 R3
BA7726AS / BA7726AFS
TO BU9252 R1 FROM BU9252
C2 C3
20
19
+-
18
17
R2
R1
C1
C3
+-
16
LPF constant examples (VCC = 9.0V) LPF constant R1 22k 18k 15k R2 56k 47k 39k R3 47k 39k 33k C1 6800pF 5600pF 4700pF C2 4700pF 3900pF 3300pF
Fig. 4 LPF
Cutoff frequency 2kHz 3kHz 4kHz
R3
C3 270pF 220pF 180pF
Pass band gain 0.6dB 0.7dB 0.8dB
CMP OUT (pin 20) output is positively correlated with Vcc. When Vcc is a voltage other than 9.0V, set the pass band gain so that maximum CMP side LPF output (input to BU9252) is 5Vp-p. Make sure that the EXP side LPF constant does not exceed the load drive capability (minimum = 0.3mA, typical 0.5mA).
(6) Vocal fader function * After the synchronous component of the left and right channels is eliminated, LPF output is added to the signal, which is then output (see figure below). The vocal component is difficult to remove from certain types of sources.
- + LPF TO OUTSW
between -4dBV and +9dBV, and is determined by the voltage impressed on pin 28 (V28, set with resistive division between Vcc and the ground). ALC level is calculated with the following equation, although slight error occurs as V28 approaches VCC. VOAML 1.0 1 x (VCC - V28) [Vrms], 2x 2 V28 0.85 x (VCC - 1.0), at LINE OUT
5
6
7
C1
8
9
+ 10 VCC = 9.0V
LINE LINE IN R IN L
C2 at LINE OUT (f = 1kHz) ALC LEVEL : VOAML (dBV) +5
Fig. 5 Vocal fader block LPF constant examples Cutoff frequency 100Hz 150Hz 200Hz LPF constant C1 0.022F 0.015F 0.01F C2 0.1F 0.068F 0.047F
0
-5
Set within this range
- 10
C1 and C2 are only necessary when using the vocal fader function.
(7) ALC level * When Vcc is 9.0V, ALC level can be set roughly
0
5 Pin 28 voltage: V28 (V)
10
These figures are for standard samples and
are not guaranteed standards.
Fig. 6 ALC level vs. pin 28 voltage
9
Multimedia ICs
(8) Microphone input detection function * This function detects the signal input to MIC AMP IN (pin 26) and outputs it to pin 30.
Pin 30 output No signal input to MIC AMP IN (pin 26) Signal input to MIC AMP IN (pin 26) GND VCC - 1.0V
Microphone amplifier input detection level : V ODET (dBV)
BA7726AS / BA7726AFS
Set within this range - 20 VCC = 9.0V at MIC AMP IN (f = 1kHz)
* The detection level is determined by the voltage impressed on pin 29 (V29, set with resistive division between Vcc and the ground) and is calculated with the following equation, although slight error occurs as V28 approaches ground. 0.03 x ( V29 1 x V29) [Vrms], 2x 2 0.85 x (VCC - 1.0), at MIC AMP IN
- 70
0
5 Pin 29 voltage: V29 (V)
10
Fig. 7 Microphone amplifier input detection level vs. pin 29 voltage
These are figures for standard samples and
are not guaranteed standards.
VODET 0.5
*Application example
MIC AMP IN NO / VC CTRL L / ST / R VCC 9V
VCC 5V 5600p 3900p 1000p 39k 18k 18k
19
- +
0.47
0.1
47
1
+ +
32 31 30 29
VOCAL DET
47k
18k
8bit D/A
28
27
26 VR
25
- +
24
23
22
21
20
18
17
ALC
220p
10
VOCAL FADER
39k
VR VR
-
+
+
1
2
3
4
5
6
7
8
9
10
11
12
13 +
14
15
16
0.47
0.1
0.015
56k 10k
0.1
+
0.068
MIC ON / OFF
10k 2.7k
LOOP GAIN
BU9252F
LINE OUT R
LINE OUT L
L / VF / R
LINE IN R
MUTE CTRL
LINE IN L
ECHO LEVEL
Fig.8
10
10
9
BA7726AFS
f = 455kHz
0.1
2.2
2.2
0.1
11
+
+
8 x 2k SRAM
8
12
7
13
6
SW
EXPAND
ADRRESS COUNTER MAIN TIMING
14
5
OUTSW
COMPRESS
5600p
15
4
1 +
16
3
+
+
+
47k
220p
18k
TEST CIRCUIT
0.1
3900p
17
2
1 +
8bit A/D S and H
18
1
0.1
Multimedia ICs
BA7726AS / BA7726AFS
*Operation notes 1 and 2) signal processing (1) LINE OUT (pins
* Be sure to attach a capacitor for phase correction to the LINE OUT pins.
+
LINE OUT R
4700p
LINE OUT L
4700p
Fig. 9
(2) Setting the loop gain * Set the LPF constant and pin 12 control voltage so that the loop gain (1st echo wave / 2nd echo wave) does not exceed 1. Be particularly careful of peaking near the LPF cutoff point. (3) ALC function and microphone amplifier input detection function * Refer to items 7 and 8 in "Circuit description." When these functions are not used, be sure to ground pins 27 and 28 (the ALC function) and pins 29 and 30 (microphone amplifier input detection function).
*External dimensions (Units: mm)
BA7726AS
28.0 0.3 32 17 8.4 0.3 32 7.8 0.3 5.4 0.2 17
2
1
+
BA7726AFS
13.6 0.2
0.51Min.
1
16 10.16
3.2 0.2 4.7 0.3
1 1.8 0.1
16
0.11
0.3 0.1
0.8
0.36 0.1
0.3Min. 0.15
1.778
0.5 0.1
0 ~ 15
SDIP32
SSOP-A32
0.15 0.1
11

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