Electronics
Semiconductor Division
RC2207
Voltage Controlled Oscillator
Features
Description
• Excellent temperature stability — 20 ppm/°C
• Linear frequency sweep
• Adjustable duty cycle — 0.1% to 99.9%
• Two or four level FSK capability
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.
• 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
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).
Applications
• FSK generation
• Voltage and current-to-frequency conversion
• Stable phase-locked loop
• Waveform generation triangle, sawtooth, pulse,
squarewave
• FM and sweep generation
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.
Block Diagram
TRIANGLE WAVE OUTPUT
SQUARE WAVE OUTPUT
A1
A2
TIMING CAPACITOR
VCO
–V
S
CURRENT
SWITCH
BINARY KEY INPUTS
TIMING RESISTORS
R1-R4
65-2207-01
Rev. 1.0.0
RAYTHEON [ RAYTHEON COMPANY ]
