CX-49G-006.000-A0248 AVX Corporation, CX-49G-006.000-A0248 Datasheet - Page 21

• 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

(2) C-MOS overtone crystal oscillation circuit
(3) Selection of ICs and circuit constants by frequency bands
(4) Method of selecting circuit constants and functions of elements
* L
There are same cases when L
C
C
C
L
L
R
This figure shows a standard C-MOS inverter crystal oscillation circuit to oscillate a crystal unit using the overtone mode.
1
2
1
2
3
1
1
: Forms load capacitance of the circuit together with C
: Forms load capacitance of the circuit together with C
: Forms load capacitance of the circuit together with C
: A bypath capacitor
: A Q dump resistor for L
: A coil to adjust load capacitance of the oscillation circuit to a value near the series. A value of several µH is used.
and R
so that C
of the third overtone frequency. A value of 10 to 22pF is used.
so that L2 comes between the third overtone frequency at which resonance frequency with C
1/3 of the third overtone frequency. A value of 10 to 22pF is used.
is used.
Selection of ICs and circuit constants by frequency bands
*1: Necessary for preventing overtone oscillation and must be changed depending on the frequency band or the C
*2: Used to reduce excitation current of the crystal unit. Necessary for stable operation of small-sized crystal units.
*3: The optimum value differs with the values of load capacitance and Rd.
Rf
Rd
Rx
C
1
might not be used.
1
Frequency
, C
2
2
comes between the third overtone frequency at which resonance frequency with L
IC
*1
*2
*3
1
. As an element for preventing self-excited oscillation, A value of several kΩ to several tens of kΩ
3~4.9(MHz)
1
1500( )
and R
1
are matched to the value of load capacitance.
Frequency range
C-MOS overtone crystal oscillation circuit
IC
C
C
1
2
5~6.9(MHz)
TC4069UB
TC4SU69F
6~22(pF)
C
470( )
X-tal
1
R
f
= 1M
2
1
1
, L
, C
, L
1
R
2
L
1
C
and L
1
1
and L1. Prevents fundamental wave oscillation. Shall be selected
and L
2
7~9.9(MHz)
2
2
. A value of approx. 5pF is used.
0~1500
. Prevents fundamental wave oscillation. Shall be selected
C
1M
1000pF
0( )
1
3
and C
L
TC74VHCU04
TC7SHU04F
TC7WHU04FU
2
20~60(MHz)
2
values.
10~22pF
3~10pF
10~19.9(MHz)
TC74HCU04A
TC7SU04F
TC7WU04FU
6~15(pF)
0( )
2
is to make oscillation and 1/3
2
is to make oscillation and
TC74VHCU04
TC7SHU04F
TC7WHU04FU
20~30(MHz)
6~15(pF)
Handling Notes
0( )