DLPS037H October 2014 – June 2024 DLPC900
PRODUCTION DATA
Figure 9-4 shows a recommended crystal oscillator configuration.
It is assumed that the external crystal oscillator will stabilize within 50ms after stable power is applied.
PARAMETER | NOMINAL | UNIT |
---|---|---|
MOSC-to-GND capacitance | 1.5 | pF |
MOSCZ-to-GND capacitance | 1.5 | pF |
PARAMETER | RECOMMENDED | UNIT |
---|---|---|
Crystal circuit configuration | Parallel resonant | |
Crystal type | Fundamental (first harmonic) | |
Crystal nominal frequency | 20 | MHz |
Crystal temperature stability | ± 30 | PPM |
Crystal frequency tolerance (including accuracy, temperature, aging, and trim sensitivity) | ± 100 | PPM |
Crystal equivalent series resistance (ESR) | 50 max | Ω |
Crystal load | 20 | pF |
Crystal shunt load | 7 max | pF |
RS drive resistor (nominal) | 100 | Ω |
RFB feedback resistor (nominal) | 1 | MΩ |
CL1 external crystal load capacitor (MOSC) | See Equation 1 | pF |
CL2 external crystal load capacitor (MOSCN) | See Equation 2 | pF |
PCB layout | A ground isolation ring around the crystal is recommended |
where