XR2209 데이터 시트보기 (PDF) - Exar Corporation

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XR2209

Voltage-Controlled Oscillator

Exar Corporation 

XR-2209

MODES OF OPERATION

Split Supply Operation

Figure 12 is the recommended configuration for split

supply operation. Diode D1 in the figure assures that the

triangle output swing at pin 8 is symmetrical about

ground. The circuit operates with supply voltages ranging

from $4V to $13V. Minimum drift occurs with $6V

supplies. For operation with unequal supply voltages, see

Figure 5.

With the generalized circuit of Figure 12, the frequency of

operation is determined by the timing capacitor, C, and

the timing resistor.

The squarewave output is obtained at pin 7 and has a

peak-to-peak voltage swing equal to the supply voltages.

This output is an “open-collector” type and requires an

external pull-up load resistor (nominally 5kW) to the

positive supply. The triangle waveform obtained at pin 8 is

centered about ground and has a peak amplitude of

VCC/2.

VCC

VCC

C

1mF

RL

12

VCC C1

3

C2 SWO 7

XR-2209

TWO 8

BIAS 5

Square Wave

Output

Triangle Wave

Output

TR

VEE

D1

4

6

10K

1mF

VEE

R

1mF

VEE

Figure 12. Split-Supply Operation, Recommended Configuration

Rev. 2.02

10

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