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PDF XR2207 Data sheet ( Hoja de datos )
| Número de pieza | XR2207 | |
| Descripción | Voltage-Controlled Oscillator | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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...the analog plus companyTM
XR-2207
Voltage-Controlled
Oscillator
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
June 1997–3
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.
XR-2207M
XR-2207CP
XR-2207D
XR-2207ID
Package
14 Lead 300 Mil CDIP
14 Lead 300 Mil PDIP
16 Lead 300 Mil JEDEC SOIC
16 Lead 300 Mil JEDEC SOIC
Operating
Temperature Range
-55°C to +125°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
BLOCK DIAGRAM
Timing
Capacitor
C1 2
C1 3
Timing
Resistors
R1 4
R2 5
R3 6
R4 7
VCC GND BIAS
1 10
ÎÎÎ VCO
11
A1
A2
Current
Switches
Figure 1. Block Diagram
14 TWO
13 SWO
12 VEE
9 BKI2
8 BKI1
Triangle Wave Out
Square Wave Out
Binary
Keying
Inputs
Rev. 2.02
E1975
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z FAX (510) 668-7017
1
1 page  
XR-2207
Q1 Q2
Q3 Q4
VCC
1
Binary
Keying
Inputs
Q14
Q13
Q5
R
Q19
R1
Q6 Q7
Q8
Timing
Capacitor
23
R
Q12
Q9 Q10 Q11
R3
Q15
R
R
–
+
2R
2R
Triangle Wave
14 Output
R2 R4
4R
Timing Resistors
7 65 4
Q16 Q18
9
BB
8
AA
Q17
10
Ground
11
BIAS
Q23
R5
Q20
Q22
R6 R7
Q21
Q24
Square Wave
Output
13
Q27
Q25 Q26
VEE
12
Figure 2. Equivalent Schematic Diagram
Rev. 2.02
5
5 Page 
XR-2207
keying inputs (pins 8 and 9), as shown in the logic table
(Table 1). If a single timing resistor is activated, the
frequency is 1/RC. Otherwise, the frequency is either
1/(R1||R2)C or 1/(R3||R4)C.
Figure 13B shows a fixed frequency application using a
single timing resistor that is selected by grounding the
binary keying inputs. The oscillator frequency is 1/R3C.
The squarewave output is obtained at pin 13 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 5kΩ) to the
positive supply. The triangle waveform obtained at pin 14
is centered about ground and has a peak amplitude of
V+/2.
Note
For Single-Supply Operation, Logic Levels are referenced to
voltage at Pin 10.
VCC
CB VCC
C
12
3
Keying Inputs
V+
8A
9B
10 GND
C1 C2
XR-2207
13
SWO
14
TWO
BIAS 11
R 1 R 2 R 3 R 4 V-
4 5 6 7 12
R1 R2 R3 R4
VEE
CB = Bypass Cap
CB
RL
Square Wave
Output
Triangle Wave
Output
VEE
A. General Case
VCC
CB VCC
C
12
3
V+
8A
9B
10 GND
C 1 C 2 13
SWO
14
XR-2207 TWO
11
BIAS
R 1 R 2 R 3 R4 V-
4 5 6 7 12
CB = Bypass Cap
R3
VEE
CB
RL
Square Wave
Output
Triangle Wave
Output
f=1/R3<C
VEE
B. Fixed Frequency Case
Figure 13. Split-Supply Operation
Rev. 2.02
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet XR2207.PDF ] | |
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