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XR-2209CN Datasheet(PDF) 10 Page - Exar Corporation

Part # XR-2209CN
Description  Voltage-Controlled Oscillator
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Manufacturer  EXAR [Exar Corporation]
Direct Link  http://www.exar.com
Logo EXAR - Exar Corporation

XR-2209CN Datasheet(HTML) 10 Page - Exar Corporation

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XR-2209
10
Rev. 2.02
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 5k
W) to the
positive supply. The triangle waveform obtained at pin 8 is
centered about ground and has a peak amplitude of
VCC/2.
RL
Square Wave
Output
Triangle Wave
C
1
mF
TR
4
6
BIAS
5
TWO
8
SWO
7
C2
3
C1
2
1
XR-2209
R
Output
1
mF
10K
D1
1
mF
Figure 12. Split-Supply Operation, Recommended Configuration
VCC
VCC
VEE
VCC
VEE
VEE


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