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4.6 BU9253AS (IC901) : LPF & Echo mix.
• Pin layout & block diagram
GND
1
ECHO VR
2
3
BIAS
4
5
DAINT IN
DAINT OUT
6
7
DALPF IN
- +
8
DALPF OUT
MIX OUT
9
• Pin function
Pin No.
1
2
ECHO VR
3
4
5
DAINT IN
6
DAINT OUT
7
DALPF IN
8
DALPF OUT
9
MIX OUT
10
11
ADLPF IN
12
ADLPF OUT
13
ADINT OUT
14
ADINT IN
15
16
17
18
1-46 (No.22041)
18
CR
OSC
17
MUTE
16
15
VCC
14
ADINT IN
13
ADINT OUT
12
ADLPF OUT
11
ADLPF IN
10
MIX IN
Symbol
I/O
GND
-
Connect GND
I
Echo level control
-
Non connect
BIAS
-
Analog part DC bias
I
DA side integrator input
O
DA side integrator output
I
DA side LPF input
O
DA side LPF output
O
Mix AMP output for original tone & echo tone
MIX IN
I
Mix AMP input pin for original tone
I
AD side LPF input
O
AD side LPF output
O
AD side integrator output
I
AD side integrator input
VCC
-
Power supply
NC2
-
Non connect
MUTE
I
Mute control signal input
CR
-
CR pin for oscillator
Description
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