BU9253AS Datasheet, PDF (5/6 Pages) Rohm – KARAOKE echo IC

Multimedia ICs
•^{Application example (for BU9253FS / BU9255FS)}
VCC
100µ ₊
0.1µ
MUTE
100p
39k
VCC
16
15
14
OSC
0.01µ
13
12
A/D
BU9253AS / BU9253FS / BU9255FS
0.012µ
20k
10k
20k
8.2k
4700p
11
10
9
–
+
IN
2.2µ
COUNTER
SRAM
D/A
–+
1
2
3
4
5
6
7
+
3300p
22µ
0.01µ
0.47µ ^4.7k
ECHO LEVEL
10k
15k
0.01µ
Fig. 2
MIX
8
OUT
+
2.2µ
Unit
RESISTOR : [Ω]
CAPACITOR: [F]
(1) Mute control functions
Pin 15 voltage (pin 17)
H
M
L
Mode
Unmuted (operating state)
Muted
Clock stop and muted
• When switching between the muted and unmuted
state (pin 15 (pin 17) L→M→H), the pin 15 (pin 17) M
time should be longer than one SRAM cycle. This is to
assure stability by initializing the SRAM before mode
switching.
Note: Figures in parentheses ( ) are for BU9253AS.
(2) Differences between BU9253AS / FS and BU9255FS
There is a difference regarding the signal stopping for
muting. With BU9253AS / FS, the output from pin 8 (pin
9) is stopped during muting. With BU9255FS, the output
from pin 5 is stopped during muting.
5