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參數(shù)資料
| 型號： | XR-2209M |
| 廠商： | EXAR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Voltage-Controlled Oscillator |
| 中文描述： | SQUARE; TRIANGULAR, 1 MHz, WAVEFORM GENERATION, CDIP8 |
| 封裝： | 0.300 INCH, CERAMIC, DIP-8 |
| 文件頁數(shù)： | 5/20頁 |
| 文件大?。?/td> | 187K |
| 代理商： | XR-2209M |
XR-2209
Rev. 2.02
5
PRECAUTIONS
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.
SYSTEM DESCRIPTION
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 2is 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 I
T
. 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
(10 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.
R
L
Square Wave
Output
Triangle Wave
Output
V
CC
S2
C
V
CC
1 F
I +
TR
4
V
EE
6
BIAS
5
TWO
8
SWO
7
C2
3
C1
2
1
XR-2209
S1
R
1 F
I-
5.1K
5.1K
Figure 3. Test Circuit for Single Supply Operation
V
CC
V
CC
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相關代理商/技術參數(shù) |
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| XR2211ACD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC |
| XR-2211ACD | 制造商:Exar Corporation 功能描述: |
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