BA7726AFS ROHM Electronics, BA7726AFS Datasheet - Page 9

• Manufacturer Part Number: BA7726AFS
• Manufacturer: ROHM Electronics

(5) LPF
• Use the internal operational amplifier and an
attached capacitor and resistor to configure a tertiary
LPF for anti-aliasing and smoothing.
(6) Vocal fader function
(7) ALC level
LPF constant examples
• After the synchronous component of the left and
• When Vcc is 9.0V, ALC level can be set roughly
Multimedia ICs
LPF constant examples (V
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
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.
(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).
C
1
Cutoff frequency
Cutoff frequency
and C
100Hz
150Hz
200Hz
2
2kHz
3kHz
4kHz
are only necessary when using the vocal fader function.
LINE
IN R
5
Fig. 5 Vocal fader block
LINE
–
IN L
6
+
7
CC
22k
18k
15k
C1
0.022 F
0.015 F
0.01 F
R
= 9.0V)
LPF
C2
8
C
1
1
LPF constant
TO OUTSW
9
56k
47k
39k
R
0.068 F
0.047 F
2
0.1 F
C
2
47k
39k
33k
R
LPF constant
3
V
1.0
between -4dBV and +9dBV, and is determined by the
voltage impressed on pin 28 (V
division between Vcc and the ground). ALC level is
calculated with the following equation, although slight
error occurs as V
6800pF
5600pF
4700pF
OAML
C1
C
20
1
V
R1
28
+ 10
– 10
2
19
+ 5
– 5
0
1
C2
0
R3
C3
0.85
2
4700pF
3900pF
3300pF
18
Fig. 6 ALC level vs. pin 28 voltage
C
BA7726AS / BA7726AFS
28
These figures are for standard samples and
2
are not guaranteed standards.
(V
(V
17
+
16
approaches V
Set within this range
–
CC
CC
Fig. 4 LPF
Pin 28 voltage: V28 (V)
– V
– 1.0), at LINE OUT
28
270pF
220pF
180pF
at LINE OUT (f = 1kHz)
R2
) [V
C
5
3
rms
C2
R1
28
CC
],
V
, set with resistive
CC
.
= 9.0V
C1
R1
Pass band gain
0.6dB
0.7dB
0.8dB
FROM BU9252
TO BU9252
10
9