CSBFB900KJ58-R1 Murata, CSBFB900KJ58-R1 Datasheet - Page 12

• Manufacturer Part Number: CSBFB900KJ58-R1
• Manufacturer: Murata

Specifications of CSBFB900KJ58-R1

• Lead Free Status / RoHS Status: Compliant

2
Note
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Fig. 2-1 shows the symbol for a ceramic resonator. The
impedance and phase characteristics measured between
the terminals are shown in Fig. 2-2. This illustrates that
the resonator becomes inductive in the frequency zone
between the frequency Fr (resonant frequency), which
provides the minimum impedance, and the frequency Fa
(anti-resonant frequency), which provides the maximum
impedance.
It becomes capacitive in other frequency zones. This
means that the mechanical vibration of a two terminal
resonator can be replaced equivalently with a
combination of series and parallel resonant circuits
consisting of an inductor : L, a capacitor : C, and a
resistor : R. In the vicinity of the specific frequency
(Refer to Note 1 on page 12.), the equivalent circuit can
be expressed as shown in Fig. 2-3.
Fr and Fa frequencies are determined by the
piezoelectric ceramic material and the physical
parameters. The equivalent circuit constants can be
determined from the following formulas. (Refer to Note
2 on page 12.)
Considering the limited frequency range of FrVFVFa,
the impedance is given as Z=Re+j Le (LeU0) as shown
in Fig. 2-4, and CERALOCK
inductance Le (H) having the loss Re ( ).
10
Fr=1/2
Fa=1/2
Qm=1/2 FrC
(Qm : Mechanical Q)
1. Equivalent Circuit Constants
2
L
L
Principles of CERALOCK
1
1
C
C
1
R
1
1
C
1
0
/(C
1
+C
0
)=Fr 1+C
®
should work as an
1
/C
0
(2-1)
(2-2)
(2-3)
Fig. 2-2 Impedance and Phase Characteristics of CERALOCK
Fig. 2-3 Electrical Equivalent Circuit of CERALOCK
Fig. 2-1 Symbol of the Two Terminal CERALOCK
Fig. 2-4 Equivalent Circuit of CERALOCK
Symbol
10
10
10
10
-90
R
L
C
C
10
90
0
5
4
3
2
1
in the Frequency Band FrVFVFa
1
1
0
: Equivalent Inductance
: Equivalent Resistance
: Equivalent Capacitance
: Parallel Equivalent Capacitance
Re
Impedance between Two Terminals Z=R+jx
(R : Real Component, X : Impedance Component)
Phase
Re : Effective Resistance
Le : Effective Inductance
L
1
Fr
®
=tan
C
C
1
0
-1
X/R
Fa
Le
R
1
Frequency (kHz)
®
®
®
P17E.pdf
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08.3.28