XR-2207
...the analog plus company
TM
Voltage-Controlled
Oscillator
Rev. 2.02
E
1975
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
FAX (510) 668-7017
1
June 19973
FEATURES
D
Excellent Temperature Stability (20ppm/
°
C)
D
Linear Frequency Sweep
D
Adjustable Duty Cycle (0.1% to 99.9%)
D
Two or Four Level FSK Capability
D
Wide Sweep Range (1000:1 Minimum)
D
Logic Compatible Input and Output Levels
D
Wide Supply Voltage Range (
$
4V to
$
13V)
D
Low Supply Sensitivity (0.1% /V)
D
Wide Frequency Range (0.01Hz to 1MHz)
D
Simultaneous Triangle and Squarewave Outputs
APPLICATIONS
D
FSK Generation
D
Voltage and Current-to-Frequency Conversion
D
Stable Phase-Locked Loop
D
Waveform Generation
Triangle, Sawtooth, Pulse, Squarewave
D
FM and Sweep Generation
GENERAL DESCRIPTION
The XR-2207 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 0.01Hz to 1MHz. It is ideally suited for
FM, FSK, and sweep or tone generation, as well as for
phase-locked loop applications.
The XR-2207 has a typical drift specification of 20ppm/
°
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.
ORDERING INFORMATION
Part No.
Package
Operating
Temperature Range
XR-2207M
14 Lead 300 Mil CDIP
-55
°
C to +125
°
C
XR-2207CP
14 Lead 300 Mil PDIP
0
°
C to +70
°
C
XR-2207D
16 Lead 300 Mil JEDEC SOIC
0
°
C to +70
°
C
XR-2207ID
16 Lead 300 Mil JEDEC SOIC
-40
°
C to +85
°
C
Î
Î
Î
VCO
14
A2
A1
13
12
2
3
4
5
6
7
Current
Switches
9
8
Triangle Wave Out
TWO
SWO
V
EE
BKI2
BKI1
Square Wave Out
Binary
Keying
Inputs
C1
C1
R1
R2
R3
R4
Timing
Capacitor
Timing
Resistors
1
10
11
V
CC
GND
BIAS
Figure 1. Block Diagram
BLOCK DIAGRAM
XR-2207
2
Rev. 2.02
PIN CONFIGURATION
NC
NC
TWO
SWO
V
CC
C1
C2
R1
V
EE
BIAS
GND
BKI2
R2
R3
R4
BKI1
16 Lead SOIC (Jedec, 0.300")
16
1
9
8
2
3
4
5
6
7
15
14
13
12
11
10
14 Lead PDIP, CDIP (0.300")
TWO
SWO
V
EE
BIAS
GND
BKI2
BKI1
V
CC
C1
C2
R1
R2
R3
R4
1
2
3
4
5
6
7
14
13
12
11
10
9
8
PIN DESCRIPTION
Pin #
Symbol
Type
Description
1
V
CC
Positive Power Supply.
2
C1
I
Timing Capacitor Input.
3
C2
I
Timing Capacitor Input.
4
R1
I
Timing Resistor 1 Input.
5
R2
I
Timing Resistor 2 Input.
6
R3
I
Timing Resistor 3 Input.
7
R4
I
Timing Resistor 4 Input.
8
BKI1
I
Binary Keying 1 Timing Resistor Select Input.
9
BKI2
I
Binary Keying 2 Timing Resistor Select Input.
10
GND
Ground Pin.
11
BIAS
I
Bias Input for Single Supply Operation.
12
V
EE
Negative Power Supply.
13
SWO
O
Square Wave Output Signal.
14
TWO
O
Triangle Wave Output Signal.
15, 16
NC
Only SOIC-16 Package.
XR-2207
3
Rev. 2.02
ELECTRICAL CHARACTERISTICS
Test Conditions: Test Circuit of
Figure 3 and Figure 4, V
CC
= V
EE
= 6V, T
A
= +25
°
C, C = 5000pF, R
1
= R
2
=
R
3
= R
4
= 20k
, RL = 4.7k
, Binary Inputs Grounded, S
1
and S
2
Closed Unless Otherwise Specified
Parameters
XR-2207ID/XR-2207M
XR-2207CP/D
Units
Conditions
Parameters
Min.
Typ.
Max.
Min.
Typ.
Max.
Units
Conditions
General Characteristics
Supply Voltage
Single Supply
S li S
li
8
26
8
26
V
See
Figure 3
Split Supplies
$
4
$
13
$
4
$
13
V
See
Figure 4
Supply Current
See
Figure 3
Single Supply
5
7
5
8
mA
Measure at Pin 1, S
1
, S
2
Open
Split Supply
See
Figure 4
Positive
5
7
5
8
mA
Measure at Pin 1, S
1
, S
2
Open
Negative
4
6
4
7
mA
Measured at Pin 12, S
1
, S
2
O
Open
Oscillator Section - Frequency Characteristics
Upper Frequency Limit
0.5
1.0
0.5
1.0
MHz
C =500pF, R
3
= 2k
Lowest Practical Frequency
0.01
0.01
Hz
C =50
µ
F, R
3
= 2M
Frequency Accuracy
$
1
$
3
$
1
$
5
% of f
O
Frequency Matching
0.5
0.5
% of f
O
Frequency Stability
Temperature
P
S
l
20
50
30
ppm/
°
C
0
°
C < T
A
< 70
°
C
Power Supply
0.15
0.15
%V
Sweep Range
1000:1
3000:1
1000:1
f
H
/f
L
R3 = 1.5k
for f
H1
R3 = 2M
for f
L
Sweep Linearity
%
C =5000pF
10:1 Sweep
S
1
2
1.5
f
H
=10kHz, f
L
= 1kHz
1000:1 Sweep
5
5
f
H
=100kHz, f
L
= 100Hz
FM Distortion
0.1
0.1
%
$
10% FM Deviation
Recommended Range of
Timing Resistors
1.5
2000
1.5
2000
k
See Characteristic Curves
Impedance at Timing Pins
75
75
Measured at Pins 4, 5, 6, or 7
DC Level at Timing Terminals
10
10
mV
Binary Keying Inputs
Switching Threshold
1.4
2.2
2.8
1.4
2.2
2.8
V
Measured at Pins 8 and 9,
Referenced to Pin 10
Input Impedance
5
5
k
Notes
Bold face parameters are covered by production test and guaranteed over operating temperature range.
XR-2207
4
Rev. 2.02
ELECTRICAL CHARACTERISTICS
(CONT'D)
Parameters
XR-2207ID/XR-2207M
XR-2207CP/D
Units
Conditions
Parameters
Min.
Typ.
Max.
Min.
Typ.
Max.
Units
Conditions
Output Characteristics
Triangle Output
Measured at Pin 13
Amplitude
I
d
4
6
4
6
V
PP
Impedance
DC L
l
10
10
DC Level
Linearity
+100
+100
mV
Referenced to Pin 10
Linearity
0.1
0.1
%
From 10% to 90% to Swing
Squarewave Output
Measured at Pin 13, S
2
Closed
Amplitude
11
12
11
12
Vpp
Saturation Voltage
0.2
0.4
0.2
0.4
V
Referenced to Pin 12
Rise Time
200
200
nsec
C
L
10pF
Fall Time
20
20
nsec
C
L
10pF
Notes
Bold face parameters are covered by production test and guaranteed over operating temperature range.
Specifications are subject to change without notice
ABSOLUTE MAXIMUM RATINGS
Power Supply
26V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range
-65
°
C to +150
°
C
. . . . .
Power Dissipation (package limitation)
Ceramic package
750mW
. . . . . . . . . . . . . . . . . . . . . . .
Derate above +25
°
C
6mW/
°
C
. . . . . . . . . . . . . . . . . .
Plastic package
625mW
. . . . . . . . . . . . . . . . . . . . . . . . .
Derate above +25
°
C
5mW/
°
C
. . . . . . . . . . . . . . . . . .
SOIC package
500mW
. . . . . . . . . . . . . . . . . . . . . . . . .
Derate above +25
°
C
4mW/
°
C
. . . . . . . . . . . . . . . . .
XR-2207
5
Rev. 2.02
2R
1
V
CC
Q13
Q14
Q15
R
Q1 Q2
Q3 Q4
Q5
R2
R
R1
Q6
Q7
2
Q12
R
3
Q19
Timing
Capacitor
Q8
Q9
Q10
Q11
R3
R4
R
2R
Triangle Wave
14
Output
Q27
Square Wave
13
Output
4R
Q20
R6
R5
R7
Q21
4
5
6
7
Q18
Q16
Q17
9
B
B
Binary
Keying
Timing Resistors
8
A
A
Inputs
Figure 2. Equivalent Schematic Diagram
Ground
11
BIAS
10
Q22
Q24
Q23
Q25 Q26
V
EE
12
+
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