... + Balun + Filter + X’Tal. + PCB antennaWireless communications module conforming to Bluetooth version 2.1 + EDR, class I. UART, USB, PCM, and ... various applications16 GPIO ports available for user’s application2 LEDs driver with faders10 bits ADC analog IO, 8 bits DAC analog ... less than 80msApplications, stereo/mono headset, automotive hands free, wireless speaker, and wireless Microphone bluetooth pcb