BU9253FS ROHM Co. Ltd., BU9253FS Datasheet - Page 9

• Manufacturer Part Number: BU9253FS
• Description: Karaoke/surround Digital Echo
• Manufacturer: ROHM Co. Ltd.

●Description of operations
＜BU9253AS/FS＞
＜BU9262AFS＞
・OSC(Oscillator)
・Mute control circuit (MUTE)
・COUNTER
・SRAM
・A/D side LPF operation amplifier
・A/D
・D/A side LPF operation amplifier
・D/A
・Mixing amplifier (MIX)
・Serial control circuit
This serial I/F circuit is for setting each register. It can be controlled by serial 16bit data. It reads in SI at the rise of SCK,
and latches data at the rise of SLT.
Clock is generated by connecting external RC circuit. Clock is used for the delay counter.
By input voltage of the mute terminal, 3 statuses, that is, mute, mute release (operating), and clock stop & mute can be
SRAM with 8Kbit capacity for generating the delay.
LPF can be structured by external RC, and band limit of signal to be input to A/D is available.
This digitalizes output signal of AD side LPF, and outputs it to SRAM.
LPF can be structured by external RC, and band limit of signal to be output to D/A is available.
This converts delayed audio digital data input from SRAM into analog signal.
This circuit is used for mixing delayed signals and (original sound) signals input from MIX IN.
This counter is for generating delay time. It can generate delay time about 131ms at oscillation frequency
Fclk = 375kHz.
selected.
D10
D12
D13
D14
D11
No.
D0
D1
D2
D3
D4
D5
D6
D7
D8
D9
Delay time
INPUT select
“ISEL”
OUTPUT select
“OSEL”
Delay out “DOSW”
Delay volume
“DLYVOL”
Feedback volume
“FBVOL”
Latch control
Mode
Delay time setting
"Refer to the separate table."
( D3、D4 ) = ( L、L )：L＋R
( D5、D6 ) = ( L、L )：FWD (L, R in phase)
H : output ON
Delay signal / volume setting
"Refer to the separate table."
Feedback / volume setting
"Refer to the separate table."
(D5, D6) = (L, H) : latch
Others are not latch
9/16
( H、H )：CLK OFF
( H、H )：NORMAL
( L、H )：MIC
( L、H )：MIC MIX
( L、L )：L－R
( L、L )：REV (R in opposite phase)
L : output OFF
Remarks