XR2207 Exar Corporation, XR2207 Datasheet - Page 12
XR2207
Manufacturer Part Number
XR2207
Description
Voltage-Controlled Oscillator
Manufacturer
Exar Corporation
Datasheet
1.XR2207.pdf
(24 pages)
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Single Supply Operation
The circuit should be interconnected as shown in
Figure 14A or Figure 14B for single supply operation. Pin
12 should be grounded, and pin 11 biased from V
through a resistive divider to a value of bias voltage
between V
through a 1 F capacitor.
XR-2207
Rev. 2.02
+
/3 and V
+
/2. Pin 10 is bypassed to ground
Keying Inputs
CB = Bypass Cap
CB = Bypass Cap
CB
Figure 14. Single Supply Operation
10
8
9
CB
10
CB
9
8
CB
A
B
GND
A
B
GND
V+
V
B. Single Frequency
V+
V
CC
R1
1
R 1
CC
A. General Case
1
R 1
C1
4
XR-2207
R2
R 2
C1
XR-2207
4
2
2
R 2
R3
5
CC
C
R3
R 3
5
C
R 3
6
12
C2
6
R 4
R4
For single supply operation, the DC voltage at pin 10 and
the timing terminals (pins 4 through 7) are equal and
approximately 0.6V above V
The logic levels at the binary keying terminals are
referenced to the voltage at pin 10.
3
C2
R 4
7
SWO
TWO
BIAS
3
7
V-
SWO
TWO
BIAS
1 2
V-
1 2
13
14
11
13
14
11
V
CC
V
3.9K
3.9K
CC
RL
5.1K
5.1K
RL
Square Wave
Triangle Wave
Square Wave
Triangle Wave
f=1/R3 C
Output
Output
Output
Output
V
CC
V
B
CC
, the bias voltage at pin 11.