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PDF BA7725S Data sheet ( Hoja de datos )
| Número de pieza | BA7725S | |
| Descripción | Analog compander for KARAOKE echo systems | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Multimedia ICs
Analog compander for KARAOKE
echo systems
BA7725S / BA7725FS
The BA7725S and BA7725FS are analog companders designed for KARAOKE echo systems, and logarithmically
compress the signal level by 1 / 2 and then logarithmically expand it by a factor of 2. These ICs can be used in com-
bination with the BU9252S or BU9252F to create a digital echo system. These ICs have an internal line mixer ampli-
fier for mixing line input and echo signals. The internal electronic volume control makes it possible to adjust the mixer
level and loop level mixer with an external DC voltage.
•Applications
Circuits that require analog signal compression and expansion
•Features
1) Internal logarithmic 1 / 2 compression circuit and 2 ×
expansion circuit
2) Internal 2-channel buffer amplifier used as a tertiary
low pass filter
3) Internal mixer amplifier that mixes line input and
microphone input
4) Internal electronic volume control allows for adjust-
ment of the echo mixer level and loop mixer level
using an external DC voltage.
5) Internal microphone amplifier and microphone input
ON / OFF switch
•Absolute maximum ratings (Ta = 25°C)
Parameter
Symbol
Limits
Power supply voltage
Power
dissipation
BA7725S
BA7725FS
VCC
Pd
13
1000∗1
600∗2
Storage temperature
Tstg – 55 ~ + 125
Operating temperature
Topr
– 10 ~ + 70
∗1 Reduced by 10mW for each increase in Ta of 1°C over 25°C.
∗2 Reduced by 6.0mW for each increase in Ta of 1°C over 25°C.
Unit
V
mW
°C
°C
•Recommended operating conditions
Parameter
Power supply voltage
Symbol
VCC
Limits
6.5 ∼ 12.0
Unit
V
1
1 page  
Multimedia ICs
BA7725S / BA7725FS
•Electrical characteristics (unless otherwise noted, Ta = 25°C, Vcc = 9V)
Parameter
Symbol Min. Typ. Max. Unit
Supply current
ICC 4.3 5.7 7.6 mA
〈LINE THROUGH〉 INPUT : LINE IN, OUTPUT : LINE OUT
Line through output level
VOLL – 9.0 – 8.0 – 7.0
dBV
Line through output distortion
THDLL — 0.15 0.5
%
Line through maximum output level
VOML + 5.0 + 7.2
— dBV
Line through noise level
VONL
— – 92
〈MIC THROUGH〉 INPUT : MIC AMP IN, OUTPUT : LINE OUT
– 77
dBV
Microphone through output level
VOML – 10.5 – 8.5 – 6.5 dBV
Microphone through output distortion
THDML
—
0.2 0.5
%
Microphone through input conversion noise VONM
— – 114 – 104 dBV
Microphone through crosstalk
CTML
— – 91
〈COMPRESS〉 INPUT : MIC AMP IN, OUTPUT : CMP BF OUT
– 75
dBV
Compress output level
VOMC – 6.5 – 4.5 – 2.5
dBV
Compress output distortion
Compress noise level
THDMC
VONC
— 0.5 2.0
— – 55 – 45
%
dBV
Compress characteristics
CMP — – 11.0 — dB
〈EXPAND〉 INPUT : DLY BF IN, OUTPUT : LINE OUT
Expand output level 1
VODL1 – 11.7 – 9.7
— dBV
Expand output distortion
THDDL — 0.25 2.0
%
Expand characteristic
EXP
— – 19.5
—
dB
Expand output level 2
VODL2
— – 54 – 44
〈Loop〉 INPUT : DLY BF IN, OUTPUT : CMP BF OUT
Loop output level 1
VODC1 – 7.5
– 5.5
—
Loop output level 2
VODC2
— – 42 – 32
〈Mode holding voltage〉
MIC OFF holding voltage
V4OFF 0.0 — 1.0
MIC ON holding voltage
V4ON 2.0 — 9.0
∗1 BW = 0.4-30kHz
∗2 DIN AUDIO
Unless otherwise noted, V4 = 9.0V (MIC ON), V6 = 9.0V (Max. LOOP GAIN)
dB
dBV
dBV
V
V
No input
Conditions
VIN = – 26.0dBV
VIN = – 26.0dBV, MIC OFF,∗1
THD = 1%,∗1
MIC OFF, Rg = 600Ω,∗2
VIN = – 52dBV
VIN = – 52dBV,∗1
Input shorted
VIN = – 44dBV, MIC OFF,∗2
VIN = – 52dBV
VIN = – 52dBV,∗1
Rg = 600Ω,∗2
VIN = – 42dBV → – 62dBV
Output level differential
VIN = – 5.0dBV, V4 = 9.0V
VIN = – 5.0dBV, V4 = 9.0V,∗1
VIN = 0dBV → – 10.0dBV
Output level differential
VIN = – 5.0dBV,
V4 = 2.0V (VR = Min. time)
Output level differential relative to VoDL1
VIN = – 5.0dBV, V6 = 9.0V
VIN = – 5.0dBV,
V6 = 2.0V (VR = Min. time)
Output level differential relative to VoDC1
—
—
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BA7725S.PDF ] | |
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