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WM9711 Datasheet(PDF) 16 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 16 Page - Wolfson Microelectronics plc |
16 / 66 page ![]() WM9711L Production Data w PD Rev 4.1 April 2004 16 AGND MICBIAS = 1.8 x CAP2 = 0.9 X AVDD CAP2 WM9711L Figure 2 Microphone Bias Schematic PHONE INPUT Pin 20 (PHONE) is a mono, line level input designed to connect to the receive path of a telephony device. The pin connects directly to the record selector for phone call recording (Note: to record both sides of a phone call, one ADC channel should record the PHONE signal while the other channel records the MIC signal). The RECVOL PGA adjusts the recording volume, controlled by register 1Ch or by the ALC function. To listen to the PHONE signal, the signal passes through a separate PGA, controlled by register 0Ch. The signal can be routed into the headphone mixer (for normal phone call operation) and/or the speaker mixer (for speakerphone operation), but not into the phone mixer (to prevent forming a feedback loop). When the phone input is not used, the phone-in PGA can be switched off to save power (see “Power Management” section). PHONE is biased internally to the reference voltage VREF. Whenever the input is muted or the device placed into standby mode, the input remains biased to VREF using special anti-thump circuitry to suppress any audible clicks when changing inputs. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 15 P2H 1 Mute PHONE path to headphone mixer 1: Mute, 0: No mute (ON) 14 P2S 1 Mute PHONE path to speaker mixer 1: Mute, 0: No mute (ON) 0Ch Phone Input 4:0 PHONE VOL 01000 (0dB) PHONE input gain 00000: +12dB … (1.5dB steps) 11111: -34.5dB Table 4 Phone Input Control |
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