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PDF BU9255FS Data sheet ( Hoja de datos )
| Número de pieza | BU9255FS | |
| Descripción | KARAOKE echo IC | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Multimedia ICs
KARAOKE echo IC
BU9253AS / BU9253FS / BU9255FS
The BU9253AS, BU9253FS and BU9255FS are single-chip ICs that contain all the components needed to configure
a KARAOKE echo system: an A / D and D / A converter, SRAM, LPF, and mixer for mixing source signals. With
these ICs, an echo function can be configured easily and with minimum external components.
•Applications
KARAOKE functions for portable stereo sets, mini com-
ponent stereo sets, video CDs and DVDs, etc.
•Features
1) Echo mixing ratio is adjustable with a DC voltage.
2) A second order LPF can be configured with the
internal amplifier and an attached capacitor and
resistor.
3) Delay time of 131ms. (when fCLK = 357kHz)
4) Internal mute function.
5) Single power supply (5V).
•Block diagram
BU9253FS / BU9255FS
16 15 14 13 12 11 10
9
OSC VCC A / D
BU9253AS
COUNTER
SRAM
MIX
D/A
12345678
18 17 16 15 14 13 12 11 10
OSC
VCC A / D
COUNTER
SRAM
MIX
D/A
123456789
1
1 page  
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
10k 20k
8.2k
20k
4700p
11 10
–
+
9
IN
2.2µ
COUNTER
SRAM
D / A –+
1234567
+ 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
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet BU9255FS.PDF ] | |
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