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參數(shù)資料
| 型號： | BU9252S |
| 廠商： | Rohm CO.,LTD. |
| 英文描述： | Audio digital delay (KARAOKE echo) |
| 中文描述： | 音頻數(shù)字延遲（卡拉OK回波） |
| 文件頁數(shù)： | 5/6頁 |
| 文件大?。?/td> | 63K |
| 代理商： | BU9252S |
5
Multimedia ICs
BU9252S / BU9252F
Circuit operation
(1) External capacitor for signal input pin
Audio signals compressed by the BA7725S or
BA7725FS have their DC component removed by an
AC coupling capacitor and are then input to pin 2 of
BU9252S or BU9252F. At this stage, level deviations
occur because the input signal is capacitor-divided by
this AC coupling capacitor C28 and by sampling hold
capacitor C27 connected to pin 1.
To prevent this, make sure that C27 is much lower
than C28.
(Note: The numbers of external components are the numbers used in the sys-
tem application example.)
(3) Delay timer settings
The delay time (i.e., the length of time the signal is
stored in the SRAM) can be set to any of eight settings
between the maximum and minimum delay times by
setting pins 6, 7 and 8 to the combination of logic sig-
nal inputs that results in the corresponding number of
counts. The maximum and minimum delay times are
determined by the oscillation frequency of the attached
ceramic resonator.
1
2
S / H
C27
C28
The sample-held analog signal is converted to digital
by the serial 8-bit A / D converter and then temporarily
stored in the internal SRAM (2k bytes).
(2) Relationship between oscillation frequency (CLK)
and delay time
Sample rate F = f
OSC
/ 32 (fosc: oscillation frequency)
F = 14.22kHz at fosc = 455kHz
Sample period T = 1 / F
Delay time Dtime = T
×
number of counts
The delay time can be set to any of the eight settings shown below by setting the logic inputs of terminals DCNT0
through DCNT2.
Logic input
Count
DCNT1
DCNT2
DCNT0
BU9252S / F
0
0
0
256
18.00
0
0
1
512
36.01
0
1
0
768
54.01
0
1
1
1024
72.02
1
0
0
1280
90.02
1
0
1
1536
108.03
1
1
0
1792
126.03
1
1
1
2048
144.04
BU9252S / F
Delay time (ms) (when f
OSC
= 455kHz)
C
C
C
(t)
(dB)
C : Delay time (ms)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| BU9253 | KARAOKE echo IC |
| BU9253AS | KARAOKE echo IC |
| BU9253FS | KARAOKE echo IC |
| BU9255FS | KARAOKE echo IC |
| BU9480 | 16-bit stereo D / A converter for audio applications |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BU9252S/F | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:マルチメディアLSI |
| BU9253 | 制造商:ROHM 制造商全稱:Rohm 功能描述:KARAOKE echo IC |
| BU9253AS | 功能描述:視頻 IC Karaoke/Surround Digital Echo RoHS:否 制造商:Fairchild Semiconductor 工作電源電壓:5 V 電源電流:80 mA 最大工作溫度:+ 85 C 封裝 / 箱體:TSSOP-28 封裝:Reel |
| BU9253AS/FS | 制造商:ROHM 制造商全稱:Rohm 功能描述:Multimedia LSIs |
| BU9253AS_05 | 制造商:ROHM 制造商全稱:Rohm 功能描述:Karaoke/Surround Digital Echo |
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