Sequential PROPHET-600 - Page 73

CEM 3340/3345
CLRT 16 €L£CTROmuitC SP«inLT»€J
2900 Maurieia A vt
Santa Clara. CA 95051
(408) 247 8046
Voltage Controlled Oscillator
The CEM 3340 and CEM 3345
an- completely tell contained,
precision voltage controlled
oscillators, featuring both ex
ponentiat and linear control
scales and up to lou' buffered
output waveforms: triangle,
sawtooth, square, and pulse with
voltage controllable pulse width.
Full temperature compensation
makes these VCOs extremely
stable, and eliminates the need
for a temperature compensation
resistor. The highly accurate
exponential and linear control
inputs are virtual ground
summing nodes, allowing mul*
CEM 3340 Circuit Block and Connection Diagram
Features
■ Large Sweep Range:
50.000:1 min.
■ Fully Temperature
Compensated. No 081
Resistor Required
■ Fou' Output Waveforms
Available. No waveform
trimming required.
■ Summing Node Inputs for
Frequency Control
■ High Exponential Scale
Accuracy
■ Low Temperature Drift
■ Voltage Controlled Pulse
Width
■ Hard and Soft Sync Inputs
■ Linear FM
■ Buffered. Short Circuit
Protected Outputs
■ t!5 Volt Supplies
tiple control voltages to be
mixed within the device itself.
Also included is provision for
hard and soft synchronisation of
the frequency, and an output
for easy adjustment of high fre
quenev tracking. Special care in
the design ensures oscillation
start-up under any power-on
sequence and supply conditions.
Although a low voltage
process has been used to reduce
die siae. cost, and leakage cur¬
rents, an on chip 6 5 volt aener
diode allows the device to
operate off t15 volt supplies,
as well as *15.-5 volt supplies