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PCM9211 Datasheet(PDF) 28 Page - Texas Instruments |
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PCM9211 Datasheet(HTML) 28 Page - Texas Instruments |
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28 / 121 page  C2 C1 R1 FILT AGND DGND Charge Pump VCO PCM9211 PLLSection PCM9211 SBAS495 – JUNE 2010 www.ti.com DIR and PLL Loop Filter Details The PCM9211 incorporates a PLL for generating clocks synchronized with the input biphase signal (S/PDIF). The onboard PLL requires an external loop filter. The components and configuration shown in Figure 20 and Table 6 are recommended for optimal performance, with these considerations: • The resistor and capacitors that configure the filter should be located and routed as close as possible to the PCM9211. The external loop filter must be placed on the FILT pins. • The GND node of the external loop filter must be directly connected with AGND pin of the PCM9211; it must be not combined with other signals. Figure 20 shows the configuration of the external loop filter and the connection with the PCM9211. Figure 20. Loop Filter Connection The recommended value of loop filter components is shown in Table 6. Table 6. Recommended Value of Loop Filter Components REF. NO. RECOMMENDED VALUE TYPE TOLERANCE R1 680 Ω Metal film or carbon ≤ 5% C1 0.068 µF Film or ceramic (CH or C0G) ≤ 5% C2 0.0047 µF Film or ceramic (CH or C0G) ≤ 5% External (XTI) Clocks, Oscillators, and Supporting Circuitry An external clock source (CMOS or crystal/resonator) is known as the XTI source. The XTI source can be either a CMOS logic source, or a crystal resonator (internal circuitry in the PCM9211 can start the crystal resonating). Whichever clock source is used, it must be 24.576 MHz. The PCM9211 uses the XTI source as a reference clock in order to calculate the sampling frequency of the incoming S/PDIF stream. It is also used as the clock source in XTI clock source mode. When using a resonator as an XTI source, the following points should be considered: • The 24.576-MHz resonator should be connected between the XTI and XTO pins • The resonator should be a fundamental mode type • A crystal or ceramic resonator can be used as the XTI source • The values of the load capacitors CL1 and CL2 and the current limiting resistor Rd all depend on the characteristics of the resonator • No external feedback resistor between the XTI and XTO pins is required, because the resistor is integrated into the device • No loads other than the resonator should be used on the XTO pin When using an external oscillation circuit with a CMOS output, the following points should be considered: • Always supply a 24.576-MHz clock on the XTI pin • Only 3.3 V is supported on the XTI pin; 5 V is not supported • XTO should be left floating 28 Submit Documentation Feedback Copyright © 2010, Texas Instruments Incorporated Product Folder Link(s): PCM9211 |
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