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CF5072BA-1 Datasheet(PDF) 2 Page - Nippon Precision Circuits Inc

Part # CF5072BA-1
Description  155MHz VCXO Module IC
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Manufacturer  NPC [Nippon Precision Circuits Inc]
Direct Link  http://www.npc.co.jp/en
Logo NPC - Nippon Precision Circuits Inc

CF5072BA-1 Datasheet(HTML) 2 Page - Nippon Precision Circuits Inc

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CF5072BA
SEIKO NPC CORPORATION —2
FUNCTIONAL DESCRIPTION
Oscillator Equivalent Circuit
The oscillator can be represented by the equivalent circuit shown below. The crystal unit is connected to XIN,
and the other terminal is connected to the LS and RP network. A varicap is added with cathode connected to
XR, and anode connected to XC.
The control voltage is applied to the VC pin, with high-resistance element connected between VC and XR
built-in.
Oscillator internal capacitors (design value)
Selecting external constants
The LS and RP values should be selected such that both (a) the resonance point in the loop formed by LS and
C0, CL, CVC is higher than the crystal oscillator frequency, and (b) the resonance point does not satisfy the
oscillation condition. (C0 is the crystal shunt capacitance, CL is the oscillator equivalent circuit capacitance,
and CVC is the varicap capacitance.)
In the oscillator circuit, if the crystal capacitance C0 is 2.85pF, the varicap (CVC) is a HVC350B (Renesas),
and the oscillator frequency is 155.52MHz, then values in the order LS = 220nH, RP = 2.2kΩ or LS = 180nH,
RP = 1.8kΩ will satisfy the conditions above. The optimal values for LS and RP will vary with crystal charac-
teristics, oscillator frequency, and varicap diode, thus the values selected should be thoroughly evaluated.
Note. RP is a damping resistor to prevent parasitic oscillation due the combined effects of the external inductor (expander coil) and
varicap capacitance/internal capacitance. It is recommended that RP be connected in parallel with LS.
Version
Internal capacitance [pF] (design value)
C1
C2
CF5072BA
11.2
14.4
XC
XIN
VSS1
XR
VC
LS
RP
RVC
RS
C2
C1
100pF
To differential
converter
VC input
X'tal
CVC


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