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PCM2702E Datasheet(PDF) 9 Page - Burr-Brown (TI) |
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PCM2702E Datasheet(HTML) 9 Page - Burr-Brown (TI) |
9 / 11 page 9 ® PCM2702 FIGURE 2. 12MHz Crystal Resonator Connection. CLOCK AND RESET The PCM2702 requires a 12MHz ( ±500ppm) clock for USB and audio functions, which may be generated by an on-chip crystal oscillator with external 12MHz crystal resonator, or supplied by an external clock applied at XTI (pin1). The 12MHz crystal resonator must be connected to XTI (pin 1) and XTO (pin 28), along with a 1M Ω resistor and two small capacitors (value is dependent upon the specified load capacitance of the crystal resonator). If an external clock is used, the clock must be supplied at XTI, and XTO must be left open. The clock signal applied at XTI must be +3.3V logic level, as this input is not +5V tolerant. Figures 2 and 3 illustrate the circuit connections required for crystal and external clock options. The PCM2702 includes an internal power-on reset circuit, which automatically initializes digital logic when VDD ex- ceeds 2.0V typical (range: 1.6V to 2.4V). Initialization requires approximately 350 µs for completion. The V DD supply must rise to 2.0V within 10ms for proper power-on sequence operation. INTERFACE SEQUENCE Power-on, Attach, and Playback Sequence The PCM2702 is ready for setup when the reset sequence has finished and the USB bus is connected. After connec- tion is established, the PCM2702 is ready to accept USB audio data. While waiting for audio data (idle state), the analog outputs are set to bipolar zero (BPZ) and the zero flag, ZERO (pin 12), is set to HIGH. When receiving the audio data, the PCM2702 stores the first audio packet, which contains 1ms of audio data, into an internal storage buffer. The PCM2702 starts playing the audio data upon detection of the Start of Frame (SOF) packet. See Figures 4 and 5 for the normal operation sequence. FIGURE 3. External 12MHz Clock Input Connection. 1 28 XTAL 12MHz 1M Ω XTI XTO 1 28 12MHz External Clock Must Be Left Open XTI XTO |
Similar Part No. - PCM2702E |
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Similar Description - PCM2702E |
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