BELLING BL3208

BL3208A/B 2048-Stage BBD
Description
The BL3208A/B is a 2048-stage low voltage operation, and low noise BBD variable delay line in audio
frequency range. The device operates on +5V to +10V supply and provides a signal delay up to 102.4ms.The
BL3208 contains 3208A and 3208B two classes. The only differences between them are the outlook and pin
assignment.
Pin Assignment
GND
OUT 2
CP1
IN
OUT 1
BL3208A
VGG
CP 2
VDD
DIP 8 PIN
GND
VGG
CP 2
IN
BL3208B
OUT 1
CP 1
OUT 2
VDD
DIP 8 PIN
Features
● Adjustable audio signal delay time range: 10.24ms102.4ms
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Wide supply voltage range: 5V-10V
Typical insertion loss: Li=0dB
Wide dynamic range: S/N=71B(type)
Low distortion: THD=2.5%(type)
Clock frequency range: 10kHz-100kHz
N-channel silicon gate process
8-pin plastic DIP for BL3208A, and 8-pin plastic
DIP in outlook of 14-pin DIP for BL3208B
Application
● Chorus, fading, vibrato and reverberation on effects
of audio equipments.
● Sound effect of electronic musical instruments
● Variable or fixed time-delay circuit for analog signals.
Address: No.810, YiShan Road ShangHai China Tel:86-021-64850700 Fax:86-64852222 Zip.200233
BL3208A/B 2048-Stage BBD
Application Circuit
3208
VDD
Input Bias
Circuit
Rs
5.6K
3.3µ
Low Pass Filter
f1<foff<fcp
Attn>40dB/oct
Out
100K
BL3208
47µ
CP1VGG
100K
in
100K
Low Pass Filter
f1<foff<fcp
Attn>40dB/oct
10K
IN
3.3µ
out1
out2
Clock
Component
Cancellation
Circuit
CP2
BL3102
Address: No.810, YiShan Road ShangHai China Tel:86-021-64850700 Fax:86-64852222 Zip.200233