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PCM1725DG4 Datasheet(PDF) 7 Page - Texas Instruments |
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PCM1725DG4 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 14 page ® 7 PCM1725 PCM1725 has a system clock detection circuit which auto- matically detects the frequency, either 256f S or 384fS. The system clock should be synchronized with LRCIN (pin 1), but PCM1725 can compensate for phase differences. If the phase difference between LRCIN and system clock is greater than ±6 bit clocks (BCKIN), the synchronization is per- formed automatically. The analog outputs are forced to a bipolar zero state (V CC/2) during the synchronization func- tion. Table I shows the typical system clock frequency inputs for the PCM1725. SYSTEM CLOCK FREQUENCY (MHz) 256fS 384fS 32kHz 8.192 12.288 44.1kHz 11.2896 16.9340 48kHz 12.288 18.432 SAMPLING RATE (LRCIN) TABLE I. System Clock Frequencies vs Sampling Rate. TYPICAL CONNECTION DIAGRAM Figure 5 illustrates the typical connection diagram for PCM1725 used in a stand-alone application. INPUT DATA FORMAT PCM1725 can accept input data in either normal (MSB-first, right-justified) or I2S formats. When pin 13 (FORMAT) is LOW, normal data format is selected; a HIGH on pin 13 selects I2S format. FORMAT 0 Normal Format (MSB-first, right-justified) 1I2S Format (Philips serial data protocol) TABLE II. Input Format Selection. FIGURE 6. Internal Power-On Reset Timing. DIN BCKIN LRCIN 2 3 1 13 12 FORMAT DM SCKI 9 5 78 6 14 PCM Audio Data Processor 256f S/384fS CLK GND Mode Control Lch Analog Out +5V Analog Rch Analog Out V CC V OUTL V OUTR CAP PCM1725 + 10µF Post LPF Post LPF FIGURE 5. Typical Connection Diagram. RESET PCM1725 has an internal power-on reset circuit. The internal power-on reset initializes (resets) when the supply voltage VCC > 2.2V (typ). The power-on reset has an initialization period equal to 1024 system clock periods after VCC > 2.2V. During the initialization period, the outputs of the DAC are invalid, and the analog outputs are forced to VCC/2. Figure 6 illustrates the power-on reset and reset-pin reset timing. DE-EMPHASIS CONTROL Pin 12 (DM) enables PCM1725’s de-emphasis function. De- emphasis operates only at 44.1kHz. DM 0 DEM OFF 1 DEM ON (44.1kHz) TABLE III. De-Emphasis Control Selection. 1024 system (= SCKI) clocks Reset Reset Removal 2.6V 2.2V 1.8V V CC Internal Reset SCKI Clock Not Recommended For New Designs |
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