SPRSP36L September 2021 – June 2026 TDA4VM , TDA4VM-Q1
PRODUCTION DATA
Figure 6-30 shows the recommended crystal circuit. All discrete components used to implement the oscillator circuit should be placed as close as possible to the OSC1_XI and OSC1_XO pins.
Figure 6-30 OSC1 Crystal ImplementationThe crystal must be in the fundamental mode of operation and parallel resonant. Table 6-34 summarizes the required electrical constraints.
| PARAMETER | MIN | TYP | MAX | UNIT | |||
|---|---|---|---|---|---|---|---|
| Fxtal | Crystal Parallel Resonance Frequency | 19.2 | 27 | MHz | |||
| Fxtal | Crystal Frequency Stability and Tolerance | Ethernet RGMII and RMII not used | ±100 | ppm | |||
| Ethernet RGMII and RMII using derived clock | ±50 | ||||||
| CL1+PCBXI | Capacitance of CL1 + CPCBXI | 12 | 24 | pF | |||
| CL2+PCBXO | Capacitance of CL2 + CPCBXO | 12 | 24 | pF | |||
| CL | Crystal Load Capacitance | 6 | 12 | pF | |||
| Cshunt | Crystal Circuit Shunt Capacitance | 19.2MHz ≤ Fxtal ≤ 20MHz | ESRxtal ≤ 30 Ω | 7 | pF | ||
| 30 Ω ≤ ESRxtal ≤ 80 Ω | 5 | pF | |||||
| 80 Ω ≤ ESRxtal ≤ 100 Ω | 3 | pF | |||||
| 20MHz ≤ Fxtal ≤ 24.576MHz | ESRxtal ≤ 30 Ω | 7 | pF | ||||
| 30 Ω ≤ ESRxtal ≤ 60 Ω | 5 | pF | |||||
| 60 Ω ≤ ESRxtal ≤ 80 Ω | 3 | pF | |||||
| Not Supported: 80 Ω ≤ ESRxtal | – | ||||||
| 24.576MHz ≤ Fxtal ≤ 25MHz | ESRxtal ≤ 30 Ω | 7 | pF | ||||
| 30 Ω ≤ ESRxtal ≤ 50 Ω | 5 | pF | |||||
| 50 Ω ≤ ESRxtal ≤ 80 Ω | 3 | pF | |||||
| Not Supported: 80 Ω ≤ ESRxtal | – | ||||||
| 25MHz ≤ Fxtal ≤ 27MHz | ESRxtal ≤ 30 Ω | 7 | pF | ||||
| 30 Ω ≤ ESRxtal ≤ 50 Ω | 5 | pF | |||||
| Not Supported: 50 Ω ≤ ESRxtal | – | ||||||
| ESRxtal | Crystal Effective Series Resistance | 100 | Ω | ||||
When selecting a crystal, the system design must consider the temperature and aging characteristics of a based on the worst case environment and expected life expectancy of the system.
Table 6-35 details the switching characteristics of the oscillator and the requirements of the input clock.
| PARAMETER | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|
| CXI | XI Capacitance | 1.544 | pF | ||
| CXO | XO Capacitance | 1.395 | pF | ||
| CXIXO | XI to XO Mutual Capacitance | 0.1 | pF | ||
| ts | Maximum Start-up Time | 9.5(1) | ms | ||
Figure 6-31 OSC1 Start-up Time