PCM4222PFB datasheet by Texas Instruments

PCM4222PFB Frequently Asked Questions (FAQs)

• What is the recommended power-up sequence for the PCM4222PFB?
  The recommended power-up sequence is to apply VDD first, followed by VCC, and then the analog power supplies (AVDD and DVDD). This ensures that the internal voltage regulators are powered up correctly.
• How do I optimize the analog input impedance for the PCM4222PFB?
  To optimize the analog input impedance, use a series resistor (Rs) and a shunt capacitor (Cs) to match the impedance of the analog input signal to the PCM4222PFB's input impedance. The recommended values are Rs = 220 ohms and Cs = 10 nF.
• What is the maximum clock frequency supported by the PCM4222PFB?
  The PCM4222PFB supports clock frequencies up to 128 kHz, but the maximum frequency depends on the specific application and the quality of the clock signal. It's recommended to use a clock frequency of 64 kHz or lower for most applications.
• How do I handle the digital output data format of the PCM4222PFB?
  The PCM4222PFB outputs data in a 24-bit, MSB-first, two's complement format. The digital output data can be configured to be either I2S or DSP format, depending on the application requirements.
• What is the recommended layout and routing for the PCM4222PFB?
  To minimize noise and ensure proper operation, it's recommended to follow a star-grounding layout, keep analog and digital signals separate, and use a solid ground plane. Additionally, use short, direct traces for the analog input signals and avoid crossing digital signals over analog signals.