TP6911- LQFP48. USB Earphone with Microphone PRODUCT NAME TP6911. TITLE LQFP48 USB to Earphone with MIC Application Note

Transcription

1 - LQFP48 USB Earphone with Microphone PODUCT NAME TITLE LQFP48 USB to Earphone with MIC Application Note Introduction The purpose of this application note is to provide specific design and layout guidelines. The is an USB Audio device tailored to the USB audio speaker and voice recorder application. It is able to play two channels speaker-out and record one channel voice through Full-Speed USB bus. Applications USB Audio Speaker USB Audio Voice ecorder USB Phone USB Earphone with Microphone Guideline on Electrical Power. X tal & PLL Circuit D PLL V MHz 0UF 0pf 0pf V V Noise on USB Power will cause phase jitter at the output of the PLL. To provide isolation from the noisy D signals, V / V is brought to a pair of dedicated package pins. tenx technology, inc. ev..0, 007/0/08

2 AP-_0EV0. USB Bus Power connect PWM for Class D Speaker PWM 0UF The differential SP+ and SP- pins are designed to drive a 8ohm speaker directly. A coupling capacitor is needed each the SP+/SP- pin and the speaker. Microphone Power Circuit A D Diode 0 0 0uF A 0UF MIC+ MIC- 04P 04P 0P Microphone A A 5 tenx technology, inc. ev..0, 007/0/08

3 AP-_0EV0 4. Analog in / out application circuit for ecording 04P ADC ANAI Amp ANAO 0 AGC MIC+ MIC- 0P A The ANA-IN transfers an input signal to the chip for recording. This ANA IN pin should be connected via an external capacitor to the ANA-OUT pin. This capacitor value, together with the 0ohm input impedance of ANA-IN, is selected to give additional cutoff at the low-frequency end of the voice pass-band. The ANA-OUT provides the preamplifier output to the user. 5. USB Full Speed Transceiver application circuit D 9 0UF V 9 4.7UF 47P 47P Build-in internal regulator for USB used. The decoupling components should be connected closely to the V power / ground pins outside the chip tenx technology, inc. ev..0, 007/0/08

4 AP-_0EV0 6. LED Indicators Port.5 with LED Intensity control pin. It support 4mA high current to drive highbrightness LED for indicator USB status. D D D MIC Mute Speaker Mute P.4 P.5 7. KSI4 Pin Define D D KSI4 KSI4: Set High or Floating 8. P.5 Pin Define D P.5 P.5: Set Low 4 tenx technology, inc. ev..0, 007/0/08

5 AP-_0EV0 9. P.7 Pin Define D Volume adjustment : P.7 64 levels function: P.7: Set High or Floating 6 levels function: P.7: Set Low 0. Earphone Output Define PWM Floating AUDION AUDIOP E EG 4 C C5 C4 EL 5 tenx technology, inc. ev..0, 007/0/08

6 AP-_0EV0. Pin Define Function define No. KSI USB Audio Device function keys Audio VOL+ H Speaker volume up Audio VOL- H Speaker volume down Audio Mute H Speaker volume mute Audio Play/Pause 4 H Audio play / pause Audio Next 5 H Audio Next song Audio Previous 6 H Audio Previous song Skype VOL+ L Speaker volume up Skype VOL- L Speaker volume down Skype MIC_Mute L Microphone mute voice Skype SKYPE 4 L SKYPE Function key Skype Call 5 L Skype call Skype OFF 6 L Skype off A tenx technology, inc. ev..0, 007/0/08

7 AP-_0EV0 7 tenx technology, inc. ev..0, 007/0/08 Circuit for Earphone/Microphone ANAI A V ESETn X X PWM ANAO KSI AUDIOP P0 P P P7 P6 P4 P P4 A AUDION SG POWE A A ND MICIN- MICIN+ KSI4 P4 GND_POWE EP ELP AUDIOP ELN GND_ AG L9 Microphone L0 SW8 6 / 64 levels SW4 Play/Pause L L4 SW5 Ne xt SW6 Previous SW7 Norm al / Skype 4 5K 9.5K D N C 0.uF L C6 0nF C5 0nF C6 0.uF C5 0.uF 8 7.5K 7 K.4K U USB Connect 4 5 GND SG 4.K 5 5.6K K L K.K D ed LED C 0.uF C0 0pF C 0pF L6 L7 C8 0uF U Earphone L COM C 0.uF C4 00uF C 0.uF MHz C4 0nF 0 C7 0nF C9 C C8 C C7 C L D Green LED SW Vol- SW Mute SW Vol+ C9 uf C uf C0 0uF U 48P PWM AUDION PWM AUDIOP PWML PWML KSO0 P0 KSO KSO V V X X P P P ESETn P4 P5 KSI5 KSI4 KSI KSI KSI KSI0 P7 P6 P4 P5 V A ANAO ANAI MICIN+ MICIN- KSI7 KSI6 C 0uF Vol+ Off Vol- MIC Mute Skype Call