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Número de pieza | BA7726 | |
Descripción | Analog compander with vocal fader for KARAOKE | |
Fabricantes | ROHM Semiconductor | |
Logotipo | ||
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No Preview Available ! 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 1250∗1
Pd
BA7726AFS 850∗2
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
1
1 page 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 THROUGH〉 INPUT : 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 MODE〉 INPUT : 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 THROUGH〉 INPUT : 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
〈COMPRESS〉 INPUT : MIC AMP IN, OUTPUT : CMP BF OUT
Compress output level
VOMC – 5.5 – 3.5 – 1.5
Compress characteristics
CMP
— + 5.2
—
〈EXPAND〉 INPUT : 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
〈Loop〉 INPUT : 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 = – 20.0dBV∗1
MIC OFF (VECHO = 0.1 × VCC)
THD = 1%∗1
No input, Rg = 1kΩ∗2
MIC OFF (VECHO = 0.1 × VCC)
VIN – 12dBV, Rg = 1kΩ∗2
MIC OFF (VECHO = 0.1 × VCC)
VIN = – 12dBV, Rg = 1kΩ∗2
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 = 1kΩ∗2
VIN = – 30dBV∗2
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)
5
5 Page 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
11
11 Page |
Páginas | Total 11 Páginas | |
PDF Descargar | [ Datasheet BA7726.PDF ] |
Número de pieza | Descripción | Fabricantes |
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