The "PCM1808PWR" is a model of an analog-to-digital converter (ADC) produced by Texas Instruments. It is part of the PCM1800 series of audio codec devices, which are designed for high-performance audio applications. The "PWR" suffix refers to the packaging type, which typically indicates the device is available in a Power PAD™ package (QFN package).
Here is a detailed explanation of the pin functions, specifications, and circuit principle for the "PCM1808PWR" device, including a full list of pin functions for all pins (for example, in the case of a 28-pin device, all 28 pin functions must be listed). I will also include 20 frequently asked questions (FAQ) in Q&A format, with detailed answers.
Pinout and Pin Functions (28 pins for PCM1808PWR)
Pin Number Pin Name Pin Type Function Description 1 VDD Power Supply Digital Power Supply pin. Connect to +3.3V power. 2 GND Ground Ground pin for digital circuit. Connect to system ground. 3 SCK Digital I/O Serial Clock input pin for I2S or PCM data interface . 4 SDIN Digital I/O Serial Data Input pin. Used for receiving data when using I2S or PCM interface. 5 MCLK Input Master Clock Input. Used to provide the clock source for the ADC. 6 LRCK Digital I/O Left-right clock for I2S/PCM data format. Used to indicate which channel (left or right) is being sent. 7 RESET Digital I/O Reset pin. A low signal on this pin resets the device. 8 FSYNC Digital I/O Frame Sync input pin, part of the audio interface protocol. 9 SDO Digital Output Serial Data Output pin for sending data when in master mode. 10 VDD_ADC Power Supply Power supply for the analog part of the ADC. Connect to +3.3V or a separate supply depending on design. 11 GND_ADC Ground Ground pin for analog section of the ADC. 12 AIN1+ Analog I/O Analog input pin 1 (positive). Used for input signals in differential analog mode. 13 AIN1- Analog I/O Analog input pin 1 (negative). Used for input signals in differential analog mode. 14 AIN2+ Analog I/O Analog input pin 2 (positive). Used for input signals in differential analog mode. 15 AIN2- Analog I/O Analog input pin 2 (negative). Used for input signals in differential analog mode. 16 VREF+ Analog I/O Reference voltage input for the analog-to-digital conversion. 17 VREF- Analog I/O Ground reference for the ADC’s internal voltage reference. 18 HPF_OUT Analog Output High-pass filter output. This pin can output a filtered signal, removing low-frequency noise. 19 DRDY Digital Output Data Ready pin. Indicates that the conversion is complete, and data is available for readout. 20 SCKO Digital Output Serial clock output pin for transmitting clock signals when using I2S or PCM interface. 21 MISO Digital I/O Master In Slave Out. Data received from the ADC in slave mode (for SPI interface). 22 MOSI Digital I/O Master Out Slave In. Data sent to the ADC in master mode (for SPI interface). 23 N/C No Connect No connection, unused pin. 24 N/C No Connect No connection, unused pin. 25 N/C No Connect No connection, unused pin. 26 N/C No Connect No connection, unused pin. 27 N/C No Connect No connection, unused pin. 28 N/C No Connect No connection, unused pin.20 Frequently Asked Questions (FAQ)
Q1: What is the recommended operating voltage for the PCM1808PWR? A1: The recommended operating voltage for the PCM1808PWR is 3.3V for both analog and digital sections.
Q2: What kind of data interface does the PCM1808PWR support? A2: The PCM1808PWR supports both I2S and PCM audio data interfaces.
Q3: Can the PCM1808PWR be used with a 5V power supply? A3: No, the PCM1808PWR should be used with a 3.3V power supply for both analog and digital power domains.
Q4: How many analog input pins are available on the PCM1808PWR? A4: The PCM1808PWR has two differential analog input pins: AIN1+ / AIN1- and AIN2+ / AIN2-.
Q5: What is the function of the MCLK pin? A5: The MCLK pin provides the master clock for the ADC, and it is typically connected to an external clock source.
Q6: What is the purpose of the VREF+ and VREF- pins? A6: The VREF+ pin provides the positive reference voltage for the ADC, while the VREF- pin provides the ground reference for the ADC’s internal voltage reference.
Q7: Does the PCM1808PWR have any output pins for audio data? A7: Yes, the PCM1808PWR provides an SDO (serial data output) pin and SCKO (serial clock output) pin for data transmission.
Q8: How do I reset the PCM1808PWR? A8: You can reset the PCM1808PWR by pulling the RESET pin low.
Q9: What is the maximum sample rate for the PCM1808PWR? A9: The PCM1808PWR supports a maximum sample rate of up to 192 kHz for audio data.
Q10: What kind of filters are implemented on the PCM1808PWR? A10: The PCM1808PWR includes a high-pass filter (HPF) to remove low-frequency noise from the audio signal.
Q11: Can the PCM1808PWR operate in master or slave mode? A11: Yes, the PCM1808PWR can operate in both master and slave modes for the serial audio interface.
Q12: How is the data formatted for I2S communication? A12: In I2S mode, the PCM1808PWR sends data in a left-justified format, with LRCK as the frame sync.
Q13: What is the function of the DRDY pin? A13: The DRDY pin is the Data Ready pin, indicating when a conversion is complete and data is ready to be read.
Q14: What is the power consumption of the PCM1808PWR? A14: The PCM1808PWR typically consumes 5mA of current when in active mode and less than 1µA in power-down mode.
Q15: What kind of clock sources can be used for the MCLK pin? A15: The MCLK pin can accept either a crystal oscillator or an external clock source, typically with a frequency of 12.288 MHz or 24.576 MHz.
Q16: Is there any provision for external reference voltage in the PCM1808PWR? A16: Yes, the PCM1808PWR allows the user to connect an external reference voltage to the VREF+ pin for better performance.
Q17: Does the PCM1808PWR have any built-in protection for the input pins? A17: The PCM1808PWR is designed with internal protection to handle typical input conditions, but external over-voltage protection is recommended.
Q18: What is the package type for the PCM1808PWR? A18: The PCM1808PWR is available in a 28-pin QFN (Quad Flat No-lead) package.
Q19: Can the PCM1808PWR be used in portable battery-powered applications? A19: Yes, the PCM1808PWR is suitable for low-power portable applications as it has low current consumption and can operate on a 3.3V supply.
Q20: What is the typical application for the PCM1808PWR? A20: The PCM1808PWR is commonly used in audio applications such as audio recording, digital audio processing, and embedded audio systems.
Let me know if you'd like more information or any clarification!
