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
Figure 9-4 Crystal Oscillator Configuration