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參數(shù)資料
| 型號(hào)： | XR-2207D |
| 廠商： | EXAR CORP |
| 元件分類： | XO, clock |
| 英文描述： | Voltage-Controlled Oscillator |
| 中文描述： | VCO, 0.00000001 MHz - 1 MHz |
| 封裝： | 0.300 INCH, SOIC-16 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大小： | 248K |
| 代理商： | XR-2207D |
XR-2207
6
Rev. 2.02
PRECAUTIONS
The following precautions should be observed when
operating the XR-2207 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 pins
4, 5, 6, and 7 be limited to
permanent damage to the device may occur if the
total timing current exceeds 10mA.
6mA. In addition,
2.
Terminals 2, 3, 4, 5, 6 , and 7 have very low internal
impedance and should, therefore, be protected from
accidental shorting to ground or the supply voltage.
3.
The keying logic pulse amplitude should not exceed
the supply voltage.
SYSTEM DESCRIPTION
The XR-2207 functional blocks are shown in the block
diagram given in Figure 1 They are a voltage controlled
oscillator (VCO), four current switches which are
controlled by binary keying inputs, and two buffer
amplifiers for triangle and squarewave outputs. Figure 2
is a simplified XR-2207 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 resistors that are connected
from the four timing terminals (pins 4, 5, 6 and 7) to
ground, and by the logic levels that are applied to the two
binary keying input terminals (pins 8 and 9). Four different
oscillation frequencies are possible since I
T
can have four
different values.
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-2207 to be
used in either single or split supply applications.
V
CC
RL
S2
C
I+
Keying Inputs
Binary
A
8
B
9
GND
10
R1
4
R2
5
R3
6
R4
7
V-
12
BIAS
11
TWO
14
SWO
13
C2
3
C1
2
V+
1
XR-2207
0.1
μ
F
Output
Square Wave
Output
Triangle Wave
5.1K
3.9K
R2
R1
R3
R4
0.1
μ
F
S1
Figure 3. Test Circuit for Single Supply Operation
V
CC
V
CC
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XR-2207M | Voltage-Controlled Oscillator |
| XR-2207ID | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PTB; No. of Contacts:18; Connector Shell Size:14; Connecting Termination:Solder; Circular Shell Style:Thru-Bulkhead Receptacle |
| XR-2208 | OPERATIONAL MULTIPLIER |
| XR-2208P | Analog Multiplier |
| XR-2208CP | Analog Multiplier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR-2207ID | 制造商:EXAR 制造商全稱:EXAR 功能描述:Voltage-Controlled Oscillator |
| XR-2207M | 制造商:EXAR 制造商全稱:EXAR 功能描述:Voltage-Controlled Oscillator |
| XR2207MD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Waveform Generator/Support |
| XR2207MD/883B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Waveform Generator/Support |
| XR2207N | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Waveform Generator/Support |
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