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PDF XR-2209M Data sheet ( Hoja de datos )
| Número de pieza | XR-2209M | |
| Descripción | Voltage-Controlled Oscillator | |
| Fabricantes | Exar Corporation | |
| Logotipo |  |
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...the analog plus companyTM
XR-2209
Voltage-Controlled
Oscillator
FEATURES
D Excellent Temperature Stability (20ppm/°C)
D Linear Frequency Sweep
D Wide Sweep Range (1000:1 Minimum)
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 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-2209 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 oscillator of the XR-2209 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.
ORDERING INFORMATION
Part No.
XR-2209CN
XR-2209M
XR-2209CP
Package
8 Lead 300 Mil CDIP
8 Lead 300 Mil CDIP
8 Lead 300 Mil PDIP
Operating
Temperature Range
0° to +70°C
-55°C to +125°C
0°C to +70°C
BLOCK DIAGRAM
Timing
Capacitor
C1 2
C2 3
Timing
Resistor
R4
VCC
1
VCO
BIAS
5
A1
A2
8 TWO Triangle Wave Out
7 SWO Square Wave Out
6 VEE
Figure 1. XR-2209 Block Diagram
Rev. 2.02
E1975
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 688-7000 z FAX (510) 688-7017
1
1 page  
XR-2209
PRECAUTIONS
SYSTEM DESCRIPTION
The following precautions should be observed when
operating the XR-2209 family of integrated circuits:
1. Pulling excessive current from the timing terminals
will adversely affect the temperature stability of the
circuit. To minimize this disturbance, it is
recommended that the total current drawn from pin 4
be limited to 6mA. In addition, permanent damage
to the device may occur if the total timing current
exceeds 10mA.
2. Terminals 2, 3, and 4 have very low internal
impedance and should, therefore, be protected from
accidental shorting to ground or the supply voltage.
The XR-2209 functional blocks are shown in the block
diagram given in Figure 1. They are a voltage controlled
oscillator (VCO), and two buffer amplifiers for triangle and
squarewave outputs. Figure 2 is a simplified XR-2209
schematic diagram that shows the circuit in greater detail.
The VCO is a modified emitter-coupled current controlled
multivibrator. Its oscillation is inversely proportional to the
value of the timing capacitor connected to pins 2 and 3,
and directly proportional to the total timing current IT. This
current is determined by the resistor that is connected
from the timing terminals (pin 4) to ground.
The triangle output buffer has a low impedance output
(10W typ.) while the squarewave is an open-collector
type. An external bias input allows the XR-2209 to be
used in either single or split supply applications.
VCC
VCC
S2
I+ C
1mF
RL
12
VCC C1
3
C2
XR-2209
SWO
TWO
BIAS
7
8
5
TR VEE
46
I-
Square Wave
Output
Triangle Wave
Output
5.1K
5.1K
1mF
R
S1
VCC
Rev. 2.02
Figure 3. Test Circuit for Single Supply Operation
5
5 Page 
XR-2209
Figure 13 is a simplified configuration for operation with
split supplies in excess of +7V. This circuit eliminates the
diode D1 used in Figure 12 by grounding pin 5 directly;
however, the triangle wave output now has a +0.6V DC
offset with respect to ground.
VCC
VCC
C
1mF
RL
12
VCC C1
3
C 2 SWO 7
XR-2209
8
TWO
BIAS 5
Square Wave
Output
Triangle Wave
Output
TR
4
R
VEE
6
VEE
1mF
VEE
Figure 13. Split-Supply Operation, Simplified Configuration
Rev. 2.02
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet XR-2209M.PDF ] | |
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