Electronics
Semiconductor Division
RC2207
Voltage Controlled Oscillator
Features
•
•
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•
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•
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Excellent temperature stability — 20 ppm/
°
C
Linear frequency sweep
Adjustable duty cycle — 0.1% to 99.9%
Two or four level FSK capability
Wide sweep range — 1000:1 min.
Logic compatible input and output levels
Wide supply voltage range —
±
4V to
±
13V
Low supply sensitivity
±
0.15%/V
Wide frequency range — 0.01 Hz to 1 MHz
Simultaneous triangle and squarewave outputs
Description
The RC2207 is a monolithic voltage-controlled oscillator
(VCO) integrated circuit featuring excellent frequency
stability and a wide tuning range. The circuit provides
simultaneous triangle and squarewave outputs over a
frequency range of 0.01 Hz to 1 MHz. It is ideally suited for
FM, FSK and sweep or tone generation as well as for
phase-locked loop applications.
As shown in the Block Diagram, the circuit is comprised of
four functional blocks: a variable-frequency oscillator which
generates the basic periodic waveforms; four current
switches actuated by binary keying inputs; and buffer
amplifiers for both the triangle and squarewave outputs.
The internal switches transfer the oscillator current to any
of four external timing resistors to produce four discrete
frequencies which are selected according to the binary logic
levels at the keying terminals (pins 8 and 9).
The RC2207 has a typical drift specification of 20 ppm/
°
C.
The oscillator frequency can be linearly swept over a 1000:1
range with an external control voltage; and the duty cycle of
both the triangle and the squarewave outputs can be varied
from 0.1% to 99.9% to generate stable pulse and sawtooth
waveforms.
Applications
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FSK generation
Voltage and current-to-frequency conversion
Stable phase-locked loop
Waveform generation triangle, sawtooth, pulse,
squarewave
• FM and sweep generation
Block Diagram
A1
TIMING CAPACITOR
VCO
A2
–V
S
TRIANGLE WAVE OUTPUT
SQUARE WAVE OUTPUT
TIMING RESISTORS
R1-R4
CURRENT
SWITCH
BINARY KEY INPUTS
65-2207-01
Rev. 1.0.0
RAYTHEON [ RAYTHEON COMPANY ]
