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BL0306 Digital echo

Description
The BL0306 is a digital ECHO IC fabricated with silicon gate CMOS technology . The BL0306 converts an
input analog signal to a digital signal and writes it into a memory IC,After a delay it reads out the digital
signal from the memory IC and then converts to an analog signal again.
Lower noise and distortion delay signal is obtained by BL0306 than by BBD. An A-D,
D-A converter block formed of ADM (Adaptive
Delta Modulation) circuit can produce a low-cost
delay system.(compatible with M50915P)

A6 1
MDI 2
RESET
CAS
4
3
A0
A2
W
DO
7
8
6
5
A5
D-GND
CC2
CC1
A3
A4
A7
A1
11
14
16
15
13
12
10
9
SHORT
17
18
RAS
LPF1 OUT
LONG
CDI
MIDD
REF
OSC OUT
OSC IN
OP1 IN
OP1 OUT
LPF2 OUT1
OP2 OUT
LPF1 IN
A-GND
LPF2 IN1
LPF2 IN2
LPF2 OUT2
VCC
28
22
19
21
20
25
24
23
26
27
34
31
29
30
32
33
35
36
OP2 IN
PDIP 36Pin
Pin Assignment
B
L
0306




Features
·Low noise(-90dBV typ.)
·Low distortion(0.5% typ.)
·3 mode delay time (100,150,200ms)
·Includes auto mute circuit to protect sound
from digital noise caused by delay time
mode change or power on.