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PDF BA7726AFS Data sheet ( Hoja de datos )

Número de pieza BA7726AFS
Descripción Analog compander with vocal fader for KARAOKE
Fabricantes ROHM Semiconductor 
Logotipo ROHM Semiconductor Logotipo



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No Preview Available ! BA7726AFS Hoja de datos, Descripción, Manual

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
Portable CD stereos with karaoke functions, VCRs, mini component stereo systems, LD players
Features
1) Internal stereo line mixer amplifier, allowing selec-
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 = 25°C)
Parameter
Symbol
Limits
Power supply voltage
Power dissipation
VCC 14
BA7726AS 12501
Pd
BA7726AFS 8502
Operating temperature
Topr
– 10 ~ + 70
Storage temperature
Tstg – 55 ~ + 125
1 Reduced by 12.5mW for each increase in Ta of 1°C over 25°C.
2 Reduced by 8.5mW for each increase in Ta of 1°C over 25°C.
Unit
V
mW
°C
°C
Recommended operating conditions (Ta = 25°C)
Parameter
Symbol Min. Typ.
Power supply voltage
VCC 4.5 9.0
Max.
12.0
Unit
V
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BA7726AFS pdf
Multimedia ICs
BA7726AS / BA7726AFS
Electrical characteristics (unless otherwise noted, Ta = 25°C, Vcc = 9.0V)
Parameter
Symbol Min. Typ.
Supply current
ICC 5.5 8.4
LINE THROUGHINPUT : LINE IN, OUTPUT : LINE OUT
Line through output level
VOLL
– 9.0 – 8.0
Max.
12.7
– 7.0
Line through output distortion
THDLL
— 0.026 0.2
Line through max. output level VOMLL + 7.8 + 10.0
Line through noise level
VONLL
— – 100 – 85
Interchannel crosstalk
CTLL
— – 85
Mute level
MT — – 100 – 85
VOCAL CUT MODEINPUT : LINE IN, OUTPUT : LINE OUT
Through mode output level
VOLLV – 1.0
0.0 + 1.0
Vocal suppression ratio 1
VOLL1
– 1.0
0.0 + 1.0
Vocal suppression ratio 2
VOLL2
— – 35 – 28
MIC THROUGHINPUT : MIC AMP IN, OUTPUT : LINE OUT
Microphone through output level VOML – 9.9 – 8.4 – 6.9
Microphone through
equivalent input noise
VONML
— – 117 – 102
Microphone input crosstalk
CTML
— – 92 – 77
ALC level
VOAML + 5.1 + 6.6 + 8.1
COMPRESSINPUT : MIC AMP IN, OUTPUT : CMP BF OUT
Compress output level
VOMC – 5.5 – 3.5 – 1.5
Compress characteristics
CMP
— + 5.2
EXPANDINPUT : DLY BF IN, OUTPUT : LINE OUT
Expand output level
VODL
– 9.4 – 7.4
Expand characteristics
EXP
— + 19.4
Echo EVR attenuation ratio
VODL
— – 50 – 40
LoopINPUT : DLY BF IN, OUTPUT : CMP BF OUT
Loop output level
VODC – 4.4 – 2.4
Loop EVR attenuation ratio
VODC
— – 29
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, 1 : B.W. = 0.4 ~ 30kHz, 2 : DIN AUDIO
2 All parameters conform to the Measurement circuit diagram.
Unit
mA No input
Conditions
dBV
%
dBV
dBV
dBV
dBV
VIN = – 20.0dBV
VIN = – 20.0dBV1
MIC OFF (VECHO = 0.1 × VCC)
THD = 1%1
No input, Rg = 1k2
MIC OFF (VECHO = 0.1 × VCC)
VIN – 12dBV, Rg = 1k2
MIC OFF (VECHO = 0.1 × VCC)
VIN = – 12dBV, Rg = 1k2
MIC OFF (VECHO = 0.1 × VCC)
MUTE (VMUTE = H)
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)
dBV
dBV
dBV
dBV
VIN = – 38dBV
Rg = 1k2
VIN = – 30dBV2
MIC OFF (VECHO = 0.1 × VCC)
V28 = 2.9V
dBV VIN = – 38dBV
dB
VIN = – 43dBV – 33dBV
Output level differential
dBV
dB
dB
VIN = – 4dBV
VIN = – 9dBV + 1dBV, Output level differential
VIN = – 4dBV and when VIN = Vodl
ECHO LEVEL = Min. (VECHO = 0.2 × VCC)
dBV
dB
VIN = – 4dBV
VIN = – 4dBV and when VIN = Vodc
LOOP GAIN = Min. (VLOOP = 0.2 × VCC)
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BA7726AFS arduino
Multimedia ICs
Operation notes
(1) LINE OUT (pins 1 and 2) signal processing
• Be sure to attach a capacitor for phase correction to
the LINE OUT pins.
LINE OUT R
LINE OUT L
4700p
4700p
Fig. 9
BA7726AS / BA7726AFS
(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 peak-
ing 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
1
1.778
16
10.16
0.5 ± 0.1 0° ~ 15°
SDIP32
0.3 ± 0.1
BA7726AFS
13.6 ± 0.2
32
17
1 16
0.8 0.36 ± 0.1
0.3Min.
SSOP-A32
0.15
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