CX-49G-006.000-A0248 AVX Corporation, CX-49G-006.000-A0248 Datasheet - Page 22

• Manufacturer Part Number: CX-49G-006.000-A0248
• Description: Crystals 6KHZ
• Manufacturer: AVX Corporation
• Series: CX49Gr

Specifications of CX-49G-006.000-A0248

• Tolerance: 50 PPM
• Termination Style: SMD/SMT
• Operating Temperature Range: - 10 C to + 70 C
• Dimensions: 4.8 mm W x 12.3 mm L x 4.5 mm H
• Mounting Style: SMD/SMT
• Frequency: 6 KHz
• Frequency Stability: 50 PPM
• Load Capacitance: 12 pF
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

(5) Method of checking oscillation circuit
qSome ICs have a low upper-limit value of usable frequency, so refer to individual IC catalog to make sure that the IC can
w The following figure shows an example of a C-MOS oscillation circuit. Check resistance Rsup is connected in series with the
eUsing a spectrum analyzer or oscilloscope, check that every oscillation is normally activated while turning the power on and
r When oscillation is normal, remove the check resistance before using the crystal circuit.
t If oscillation is unstable or is not generated, gradually decrease the values of C
yIf normal oscillation cannot be generated near 10MHz or near 20MHz, replace the IC with a new one suitable for higher
(6) Load capacitance and oscillation frequency of transistor/fundamental crystal oscillation circuit
frequency can be obtained.
When these calculation results are substituted for the following equation for load resonance frequency, the oscillation
oscillate a crystal unit with an adequate negative resistance.
crystal unit to check the negative resistance. Use 3 to 22pF for C
resistance.
off several times. For oscillation circuits with no power regulator ICs, carefully check changes in the negative resistance
against supply voltage and in frequencies.
frequencies.
comprised of C
transistor are ignored. Since trimmer capacitor is adjusted to C
frequency, the value of C
Viewed from the connection terminals of a crystal unit, the load capacitance C
1
, C
C
t
, C
1
2
, and C
L
C
f
at this time can be obtained from the following equation.
L
R
L
f
=
MIN. =
f
s
R
sup
3
2 (C
if stray capacitance of the circuit and the capacitance between base and emitter of the
C
0
C
+C
1
C
1
1
+C
2
L
)
T
+ 1
+
C
1
2
+
C
1
3
Frequency range
10.1~14.0MHz
14.1~20.0MHz
6.1~10.0MHz
−1
3.5~4.5MHz
4.6~6.0MHz
~ C
L
MAX.=
T
1
= MIN. to MAX. for zero adjustment of the oscillation
and C
C
1
+C
1
2
1
, and see the table below for values of check
and C
T
Values of check resistance
+
2
C
1
until normal oscillation is obtained.
2
L
+
of an oscillation circuit is generally
C
1
1.5k
1.0k
800
500
400
3
−1
Handling Notes