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參數(shù)資料
| 型號(hào)： | XR2209CN |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 13/20頁 |
| 文件大小： | 187K |
| 代理商： | XR2209CN |
XR-2209
Rev. 2.02
13
If R = 2M , R
C
= 2k , C = 5000pF, then a 1000:1
frequency sweep would result for a negative sweep
voltage V
C
V
EE
.
The voltage to frequency conversion gain, K, is controlled
by the series resistance RC and can be expressed as:
K
f
V
C
-
1
R
C
CV
EE
Hz V
The circuit of Figure 15can operate both with positive
and negative values of control voltage. However, for
positive values of V
C
with small (R
C
/R) ratio, the direction
of the timing current I
T
is reversed and the oscillations will
stop.
Frequency Control (Sweep and FM) - Single Supply
The circuit given in Figure 16shows the frequency sweep
method for single supply operation. Here, the oscillation
frequency is given as:
f
1
RC
1
R
R
C
1 –V
C
V
T
where V
T
= Vpin4 ~ Vbias + 0.7V.
This equation is valid from V
C
= 0V where R
C
is in parallel
with R and I
T
is maximum to:
V
C
V
T
1
R
C
R
where I
T
= 0 and oscillation ceases.
Caution:
Total timing current I
T
must be ess than 6mA over the
frequency control range.
V
CC
R
L
Square Wave
Output
V
CC
Triangle Wave
Output
C
V
CC
1 F
4
6
BIAS
5
TWO
8
SWO
7
TC2
3
TC1
2
1
XR-2209
R
R
C
V
C
+
V
C
I
T
I
C
I
O
1 F
V
C
-
Sweep
or
FM
Voltage
Figure 15. Frequency Sweep Operation, Split Supply
V
EE
V
EE
V
EE
T4
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR-2209CN | 制造商:EXAR 制造商全稱:EXAR 功能描述:Voltage-Controlled Oscillator |
| XR2209CP | 功能描述:VCXO振蕩器 Voltage Controlled Oscillator RoHS:否 制造商:Fox 封裝 / 箱體:5 mm x 3.2 mm 頻率:19.2 Mhz 頻率穩(wěn)定性:2.5 PPM 輸出格式: 封裝:Reel 電源電壓:3 V 端接類型:SMD/SMT 尺寸:3.2 mm W x 5 mm L x 1.5 mm H 最小工作溫度:- 20 C 最大工作溫度:+ 75 C |
| XR-2209CP | 制造商:EXAR 制造商全稱:EXAR 功能描述:Voltage-Controlled Oscillator |
| XR2209CP-F | 功能描述:VCXO振蕩器 4V-13V 0.01Hz-1MHz temp 0C to 70C RoHS:否 制造商:Fox 封裝 / 箱體:5 mm x 3.2 mm 頻率:19.2 Mhz 頻率穩(wěn)定性:2.5 PPM 輸出格式: 封裝:Reel 電源電壓:3 V 端接類型:SMD/SMT 尺寸:3.2 mm W x 5 mm L x 1.5 mm H 最小工作溫度:- 20 C 最大工作溫度:+ 75 C |
| XR2209CP-F | 制造商:Exar Corporation 功能描述:Voltage-Controlled Oscillator (VCO) IC |
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