SNAS579G March 2012 – December 2014 LMK00105
PRODUCTION DATA.
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The value of capacitor and resistor depend on the crystal. Each crystal is specified with a load capacitance and resistor is used to avoid over driving the crystal.
The example crystal specifications are given in Table 5.
NO. | ITEM | SYMBOL | ELECTRICAL SPECIFICATION | |||
---|---|---|---|---|---|---|
MIN | TYP | MAX | UNIT | |||
1 | Nominal Frequency | F0 | 25 | MHz | ||
2 | Mode of Vibration | Fundamental | ||||
3 | Frequency Tolerance | ΔF/F0 | –15 | 15 | ppm | |
4 | Load Capacitance | CL | 9 | pF | ||
5 | Drive Level | DL | 100 | 300 | µW | |
6 | Equivalent Series Resistance | R1 | 9 | 50 | Ω | |
7 | Shunt Capacitance | C0 | 2.1 ± 15% | pF | ||
8 | Motional Capacitance | C1 | 9.0 ± 15% | fF | ||
9 | Motional Inductance | L | 4.6 ± 15% | mH | ||
10 | Frequency Stability | TC | –20 | 20 | ppm | |
11 | C0/C1 Rate | 250 |
Based on the OSCin shunt capacitance and stray capacitance, C1 and C2 are chosen as 6.8 pF to make the load capacitance (CL) to be 9 pF. Suggested value of RLIM is 1.5 kΩ. Refer to Detailed Design Procedure for the derivation.