參數(shù)資料
型號(hào)： XR-215ACP
廠商： EXAR CORP
元件分類： XO, clock
英文描述： Monolithic Phase-Locked Loop
中文描述： PLL FREQUENCY SYNTHESIZER, 25 MHz, PDIP16
封裝： 0.300 INCH, PLASTIC, DIP-16
文件頁(yè)數(shù)： 15/32頁(yè)
文件大?。?/td> 331K
代理商： XR-215ACP
XR-215A
15
Rev. 1.01
Figure 12. Explanation of VCO Range-Select Controls
Range Select
> 3V, F
1
Internal
Bias
I
1
I
2
T
1
T
2
600
1.3V
10
R
X
Input
0V, Fo
á
9
Fo = F1(1+(0.6/R
X
))
Range-Select (Pin 10)
The frequency range of the XR-215A can be extended by
connecting an external resistor, R
X
, between pins 9 and
10. With reference to Figure 12 the operation of the
range-select terminal can be explained as follows: The
VCO frequency is proportional to the sum of currents I
1
and I
2
through transistors T
1
and T
2
on the monolithic
chip. These transistors are biased from a fixed internal
reference. The current I
1
is set internally, whereas I
2
is set
by the external resistor R
X
. Thus, at any C
0
setting, the
VCO frequency can be expressed as:
f
0
f
1
1
0.6
R
X
where f
1
is the frequency with pin 10 open circuited and
R
X
is in k . External resistor R
X
(
recommended for operation at frequencies in excess of
5MHz.
750 ) is
The range select terminal can also be used for fine tuning
the VCO frequency, by varying the value of R
X
. Similarly,
the VCO frequency can be changed in discrete steps by
switching in different values of R
X
between pins 9 and 10.
Digital Programming
Using the range select control, the VCO frequency can be
stepped in a binary manner, by applying a logic signal to
pin 10, as shown in Figure 12. For high level logic inputs,
transistor T
2
is turned off, and R
X
is effectively switched
out of the circuit. Using the digital programming capability,
the XR-215A can be time-multiplexed between two
separate input frequencies, as shown in Figure 19and
Figure 20.
Amplifier Input (Pin 1)
This pin provides the inverting input for the operational
amplifier section. Normally it is connected to pin 2 through
a 10 k external resistor (see Figure 3 or Figure 4.)
相關(guān)PDF資料
PDF描述
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XR-215A Monolithic Phase Locked Loop
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