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DIR1703 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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DIR1703 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 19 page DIR1703 SLES007– JULY 2001 10 www.ti.com bit rate detection By using the SpAct frequency estimator (not the S/PDIF channel status bit), the DIR1703 automatically detects the sample rate of an incoming S/PDIF signal and indicates the frequency at the BRATE pins. Table 6 lists the frequency ranges reported. Except for 88.2 and 96 kHz, these sample rates are the same as the channel status bit defined in the S/PDIF specifications. When the bit-rate is 88.2 or 96 kHz the indicator shows the same HL value. This state is not defined in the S/PDIF specifications. Table 6. Incoming Sample Frequency Bits SAMPLING RATE BRATE1 BRATE0 32 kHz HIGH HIGH 44.1 kHz LOW LOW 48 kHz LOW HIGH 88.2 kHz HIGH LOW 96 kHz HIGH LOW timing specification for PLL operation lock-up time Lock L H tINT< 1 ms Unlock DIN Start PLL Condition PLL Status Indicator Pin Site UNLOCK Figure 3. PLL Lock Up Timing relation between audio-data-output timing and PLL condition indicator timing In the PLL clock operation mode, when the S/PDIF signal is not detected after reset removal, audio clocks (SCKO, BCKO, LRCKO) which are not related to S/PDIF signal are generated by SpAct. The bit rate can be selected by setting pin BRSEL. If BRSEL is OPEN or connected to DGND, the default bit rate frequency is set to 48 kHz. If BRSEL is connected to one of the output pins BFRAME, EMFLG, URBIT, or CSBIT, the frequency is set to 32, 44.1, 88.2, or 96 kHz, respectively. Therefore, the initial frequency is the same as the crystal resonator, however, its error frequency is below 1% after reset. When the analog PLL is still unlocked after at least ten rising-edges of the S/PDIF, a S/PDIF decoder can detect the incoming S/PDIF signal. Thus, DOUT becomes low (MUTE) until the analog PLL locks. This MUTE period is less than 1 ms (analog PLL’s lock-up time is less than 0.5 ms). When the decoder does not detect an incoming S/PDIF signal, UNLOCK will output high level status at the LRCKO clock transition. SCKO keeps its frequency at the latest tracked bit rate. |
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