XR2209 Exar Corporation, XR2209 Datasheet - Page 10

• Manufacturer Part Number: XR2209
• Description: Voltage-Controlled Oscillator
• Manufacturer: Exar Corporation

MODES OF OPERATION
Split Supply Operation
Figure 12 is the recommended configuration for split
supply operation. Diode D
triangle output swing at pin 8 is symmetrical about
ground. The circuit operates with supply voltages ranging
from
supplies. For operation with unequal supply voltages, see
Figure 5.
With the generalized circuit of Figure 12 , the frequency of
XR-2209
Rev. 2.02
4V to
13V. Minimum drift occurs with
Figure 12. Split-Supply Operation, Recommended Configuration
1
1 F
in the figure assures that the
V
V
R
CC
CC
TR
V
1
EE
4
C1
XR-2209
2
C
C2
6V
3
V
SWO
TWO
BIAS
EE
10
6
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 ) to the
positive supply. The triangle waveform obtained at pin 8 is
centered about ground and has a peak amplitude of
V
7
8
5
CC
/2.
V
1 F
CC
10K
R
L
Square Wave
Triangle Wave
Output
Output
V
EE
D1
1 F