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參數(shù)資料
| 型號(hào)： | BA7726 |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Analog compander with vocal fader for KARAOKE |
| 中文描述： | 模擬擴(kuò)展器與卡拉OK演唱推子 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大小： | 148K |
| 代理商： | BA7726 |
9
Multimedia ICs
BA7726AS / BA7726AFS
(5) LPF
Use the internal operational amplifier and an
attached capacitor and resistor to configure a tertiary
LPF for anti-aliasing and smoothing.
Cutoff frequency
LPF constant
Pass band gain
R
1
R
2
R
3
C
1
C
2
C
3
2kHz
22k
56k
47k
6800pF
4700pF
270pF
0.6dB
3kHz
18k
47k
39k
5600pF
3900pF
220pF
0.7dB
4kHz
15k
39k
33k
4700pF
3300pF
180pF
0.8dB
LPF constant examples (V
CC
= 9.0V)
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).
20
19
18
17
16
–
+
–
+
R
R
C3
R1
R3
C2
C1
C
R
R2
R1
C2
C1
R1
TO BU9252
FROM BU9252
Fig. 4 LPF
(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 cer-
tain types of sources.
5
6
7
8
9
LINE
IN L
LINE
IN R
C2
C1
LPF
+
–
TO OUTSW
Fig. 5 Vocal fader block
LPF constant examples
Cutoff frequency
LPF constant
C
1
C
2
100Hz
0.022
μ
F
0.1
μ
F
150Hz
0.015
μ
F
0.068
μ
F
200Hz
0.01
μ
F
0.047
μ
F
C
1
and C
2
are only necessary when using the vocal fader function.
(7) ALC level
When Vcc is 9.0V, ALC level can be set roughly
between -4dBV and +9dBV, and is determined by the
voltage impressed on pin 28 (V
28
, set with resistive
division between Vcc and the ground). ALC level is
calculated with the following equation, although slight
error occurs as V
28
approaches V
CC
.
0
0
V
CC
= 9.0V
5
10
Set within this range
+ 10
+ 5
– 5
– 10
Pin 28 voltage: V28 (V)
A
O
at LINE OUT (f = 1kHz)
Fig. 6 ALC level vs. pin 28 voltage
These figures are for standard samples and
are not guaranteed standards.
V
OAML
6
1.0
%
V
28
%
0.85
×
(V
CC
– 1.0), at LINE OUT
1
2
×
2
×
(V
CC
– V
28
) [V
rms
],
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BA7726AFS | 制造商:ROHM 制造商全稱:Rohm 功能描述:Analog compander with vocal fader for KARAOKE |
| BA7726AS | 制造商:ROHM 制造商全稱:Rohm 功能描述:Analog compander with vocal fader for KARAOKE |
| BA7726AS/AFS | 制造商:ROHM 制造商全稱:Rohm 功能描述:Multimedia LSIs |
| BA7730S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
| BA7731S | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Consumer IC |
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