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PDF BU9253AS Data sheet ( Hoja de datos )
| Número de pieza | BU9253AS | |
| Descripción | Karaoke/Surround Digital Echo | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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TECHNICAL NOTE
Audio Accessory ICs
Karaoke/Surround
Digital Echo
BU9253AS/FS, BU9262AFS
●Description
The Karaoke/Surround Digital Echo IC incorporates a digital delay circuit, an input/output mixing circuit, supporting Karaoke
echo and surround system, all in a single chip.
BU9253AS/FS has functions required by Karaoke echo system, and BU9262AFS has various functions required for
surround / echo system.
●Features
＜BU9253AS/FS＞
1) Digital delay time : 131ms (fCLK = 375kHz)
2) Built-in mixing circuit for adding original sound and echo sound
3) Echo mix ratio settable by DC voltage
4) Built-in amplifier circuit for structuring input/output secondary LPF
5) Microphone mute function (mute of mixing sound of original sound + echo sound)
6) Built-in CR oscillation circuit
＜BU9262AFS＞
1) Digital delay time : 8-stage setting from 9.2ms to 192ms
2) Built-in input/output mixing circuit
3) Built-in feedback, delay volume circuit
4) Built-in input/output LPF
5) Serial interface
6) Auto mute circuit built in (action at power on, mode switching)
7) Built-in auto reset circuit at power on
●Applications
Radio cassette recorder, mini-component and karaoke systems.
●Product lineup
Parameter
Supply voltage
Oscillation frequency
Current consumption
Operating temperature range
Package
Digital delay
Echo level
BU9253AS
4.0V～5.5V
375kHz
6mA
-10～+70℃
SDIP18
Fixed
Fixed
BU9253FS
4.0V～5.5V
375kHz
6mA
-10～+70℃
SSOP-A16
Fixed
Fixed
BU9262AFS
4.5V～5.5V
2MHz
20mA
-10～+70℃
SSOP-A32
Variable
Variable
Ver.B Oct.2005
1 page  
●Reference data
＜BU9253AS/FS＞
Ta=25℃
7.0
6.5
6.0
5.5
5.0
4.5
4.0
4.0
4.5 5.0 5.5
INPUT VOLTAGE : VCC [V]
Fig.1 Current consumption
Ta=25℃
385
380
375
370
365
360
355
4.0
4.5 5.0 5.5
INPUT VOLTAGE : VCC [V]
Fig.2 Oscillation frequency
VCC=5V / Ta=25℃
4.5
4.0
3.5
3.0 Mute
2.5
2.0
1.5
1.0
Mute & OSC stop
0.5
0.0
4.0
4.5 5.0 5.5
INPUT VOLTAGE : VCC [V]
Fig.4 Mute pin threshold
VCC=5V / Ta=25℃
20
10
0
-10
-20
-30
-40
1K
10K
100K
1M 10M
INPUT FREQUENCY : FIN [Hz]
Fig.7 LPF operation amplifier frequency
characteristic
VCC=5V / Ta=25℃
6
5
4
3
2
1
0
-1.5
-1.0 -0.5 0.0 0.5 1.0 1.5
OUTPUT CURRENT : IOUT [mA]
Fig.10 LPF operation amplifier
output performance
VCC=5V / Ta=25℃
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0.0
1.0 2.0 3.0 4.0 5.0
ECHO VR VOLTAGE : VR [V]
Fig.5 ECHO VR characteristic
VCC=5V / Ta=25℃
20
10
0
-10
-20
-30
-40
1K
10K 100K 1M 10M
INPUT FREQUENCY : FIN [Hz]
Fig.8 MIX operation amplifier
frequency characteristic
VCC=5V / Ta=25℃
6
5
4
3
2
1
0
-1.5
-1.0 -0.5 0.0 0.5 1.0 1.5
OUTPUT CURRENT : IOUT [mA]
Fig.11 MIX operation amplifier
output performance
5/16
Ta=25℃
2
0
Through side
-2
-4
Delay side
-6
-8
4.0
4.5 5.0 5.5
INPUT VOLTAGE : VCC [V]
Fig.3 Total gain characteristic
VCC=5V / Ta=25℃
10
5
0
-5
-10
-15
-20
0.1
1.0
INPUT FREQUENCY: FIN [kHz]
10.0
Fig.6 A/D frequency characteristic
VCC=5V / Ta=25℃
5.5
5.0
THD=３%
4.5
4.0
3.5
3.0
2.5
1.0
10.0
100.0
OUTPUT LOAD : RLOAD [kΩ]
Fig.9 Through side output load drive
characteristic
VCC=5V / Ta=25℃
5.5
5.0
THD=1%
4.5
4.0
3.5
3.0
2.5
1.0
10.0
100.0
OUTPUT LOAD : RLOAD [kΩ]
Fig.12 Delay side output load drive
characteristic
5 Page 
・Output/ input LPF circuit
This is the LPF circuit connected to the ADC input unit and the DAC output unit. Delay time setting can be select by
internal resistor.
Delay amount
Switch
Resistance value
48.0msec or below
S1
4.8kΩ*
96.0msec or below
S2
11.3kΩ*
*Internal resistance precision is ±30%.
Pin1s11、11,91ピ9ン
Pi1n2s、1220ピ, 2ン0 P1i3n、s211ピ3,ン21
R1
R2
S1
R1 R1
R2 R2
S2
N(o注te)1:1IピnンPでinは1外1,付isけa容n量e結x合teにrnなaりl cまaすpacity connection
Fig.32 Input LPF / Output LPF circuit
・Auto mute circuit
Delay output is muted during power on and delay time switching.
●Timing chart
＜BU9262AFS＞
・Serial interface specification
SI D0 D1
D12 D13 D14 D15
SCK
SLT
・Serial timing
Fig.33 Serial interface specification
SCK
SI
twCK
tdsu
twCK
th
tdsu
SLT twLT
Fig.34 Serial timing
11/16
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| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet BU9253AS.PDF ] | |
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