cum
acmmusic
~~YCI~LT'H~
2900
Maur~c~a
Aue.
Santa
Clara,
CA
95051
(4081
247-8046
Voltage
Controlled
Envelope
Generator
1
The
CEM3310
is
a
self-contained,
Features
precision
ADSR
type of envel-
Low
Cost
ope generator intended
for
elec-
1
~hi~d ~~~~~~~i~~
~~~i~~
tronic
music
and other swnd
generation
appfications. Attack,
I
Large Time Control
Range:
decay
and
release times
are
50,000
min
exponentially
voltage
control-
Full
ADSR
Response
fable over a
wide
range,
and
the
True
8C
Envelope Shape
sustain level
is
linearly voltage
. Exceptionally
Low
Control
controllable from
0
to
100%
of
Voltage
Feedthrough.:
90pVmax
the peak voltage.
A
unique de-
sign approach allows
for
a
I
Accurate
Exponential Time
Control Scales
10,000
times
improvement in
control voltage rejection over
1
Isolated Control Inpua
conventional designs. In addi-
tion,
much care has
been
given
to
the
accuracy,
repeatabiiity
and
tracking of the parameters
from unit to unit without
ex-
ternar trimming.
The
times are
to
a
first order determined
only
by
the
external resistor and
capacitor and constant
of
phy-
sics.KTB. Wide tolerance rnono-
lithic resistors are
not
used
to
set
up
the time constants or the
control scale. Finally, all four
control inputs
are
isolated
from
the
rest
of
the circuitry
so
that
the
control pins
of
tracking units
may
be
simply
tied together.
Although
a
low
voltage process
has
been
used
to
lower the cost
and
lower the leakage currents,
an internal
6.5
volt Zener
diode
allows the chip to
be
powered
by
k
15
volts supplies.
as
well
as
f
15,
-5 volt supplies.
*
Zero
to
-5V
Varier
the
Times
from
2rnS
to
20s
**
Zero
to
+5V
Varies
the
Sustain
Lsvel
from
0
to
100%
III
Good Repeatability
and
Tracking Between Units
Without External Trim
I
Independent
Gate
and
Trigger
1
I
*
15
Volt Supplies
Circuit
Block
and
Connection Diagram
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