Alesis Semiconductor
DS3201-0802 12555 Jefferson Blvd., Suite 285
Los Angeles, CA 90066
Phone (310) 301-0780 Fax (310) 306-1551 www.alesis-semi.com

We make the parts that set creative people free
General Description

The AL3201 (SCR, or Single Chip Reverb)
is a one chip reverb solution that is
compact, easy to use, and yet quite
powerful. Built-in DRAM eliminates the
need for wide bus connections to external
RAM, and the choice of built-in programs
and a user programmable RAM allows
instant usability or custom program
design.

Features

boxshadowdwn 16 internal ROM programs consisting
of halls, rooms, plates, delays, chorus,
flange, vocal cancel, and rotary
speaker emulation.
boxshadowdwn Serially programmable SRAM (Writable
Control Store – WCS) for program
development or dynamically changing
programs
boxshadowdwn Programs run at 128 instructions per
word clock. (6 MIPS @ 48kHz sam-
pling frequency.)
boxshadowdwn 32k location DRAM provides over 0.68s
of delay at 48kHz sampling frequency.
boxshadowdwn Internal crystal oscillator circuit
eliminates need for discrete external
passive components.
boxshadowdwn Internal voltage regulators allow opera-
tion at both 5V and 3.3V V
DD
.
boxshadowdwn Internal 1000pF bypass capacitor to
reduce voltage swings at the rails.


Applications

boxshadowdwn Personal stereos with reverb functions.
boxshadowdwn Extremely portable guitar effects boxes.
boxshadowdwn Karaoke machines utilizing the vocal cancel program.
boxshadowdwn Hardware reverb effects for computer sound cards.
boxshadowdwn Ambience settings for car stereos.
DigOut
Int/Ext
XtalIn
XtalOut
Prog0/SData
Prog1/SClk
Prog2
Prog3
DigIn
Bypass
Gnd
Reset
SysClk
BitClk
WordClk
16 pin SOIC
300 mils wide
1
8
1
6
9
V
DD
A
L
3
2
0
1
S
C
R