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參數(shù)資料
| 型號： | XR-2207M |
| 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, CERAMIC, DIP-14 |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 248K |
| 代理商： | XR-2207M |
XR-2207
13
Rev. 2.02
Frequency Control (Sweep and FM)
The frequency of operation is controlled by varying the
total timing current, I
T
, drawn from the activated timing
pins 4, 5, 6, or 7. The timing current can be modulated by
applying a control voltage, V
C
, to the activated timing pin
through a series resistor R
C
. As the control voltage
becomes more negative, both the total timing current, I
T
,
and the oscillation frequency increase.
The circuits given in Figure 15 and Figure 16show two
different frequency sweep methods for split supply
operation.
Both binary keying inputs are grounded for the circuit in
Figure 15 Therefore, only timing pin 6 is activated.
The frequency of operation, normally
proportional to the control voltage, V
C
, and determined
as:
f
1
R
3
C is now
f
1
R
3
C
1
V
C
R
3
R
C
V-
Hz
If R
3
= 2M
, R
C
= 2k
, C = 5000pF, then a 1000:1
frequency sweep would result for a negative sweep
voltage V
C
V-.
The voltage to frequency conversion gain, K, is controlled
by the series resistance RC and can be expressed as:
K
f
V
C
R
C
1
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
3
) ratio, the direction of the
timing current I
T
is reversed and the oscillations will stop.
Figure 16shows an alternate circuit for frequency control
where two timing pins, 6 and 7, are activated. The
frequency and the conversion gain expressions are the
same as before, except that the circuit will operate only
with negative values of V
C
. For V
C
> 0, pin 7 becomes
deactivated and the frequency is fixed at:
f
1
R
3
The circuit given in Figure 17shows the frequency sweep
method for single supply operation. Here, the oscillation
frequency is given as:
f
1
R
3
C
1
R
3
R
C
1
V
C
V
T
where VT = Vbias + 0.7V.
This equation is valid from VC = 0V (RC is in parallel with
R3) to
V
C
V
T
1
R
C
R
3
Caution
Total timing current I
T
must be ess than 6mA over the frequency
control range.
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