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WM9711 Datasheet(PDF) 14 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 14 Page - Wolfson Microelectronics plc |
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14 / 66 page  WM9711L Production Data w PD Rev 4.1 April 2004 14 AUDIO INPUTS The following sections give an overview of the analogue audio input pins and their function. For more information on recommended external components, please refer to the “Applications Information” section. LINE INPUT The LINEINL and LINEINR inputs are designed to record line level signals, and/or to mix into one of the analogue outputs. Both pins are directly connected to the record selector. The record PGA adjusts the recording volume, controlled by register 1Ch or by the ALC function. For analogue mixing, the line input signals pass through a separate PGA, controlled by register 10h. The signals can be routed into all three output mixers (headphone, speaker and phone). Each LINEIN-to-mixer path has an independent mute bit. When the line inputs are not used, the line-in PGA can be switched off to save power (see “Power Management” section). LINEINL and LINEINR are biased internally to the reference voltage VREF. Whenever the inputs are muted or the device placed into standby mode, the inputs remain biased to VREF using special anti- thump circuitry to suppress any audible clicks when changing inputs. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 12:8 LINEINL VOL 01000 (0dB) LINEINL input gain 00000: +12dB … (1.5dB steps) 11111: -34.5dB 4:0 LINEINR VOL 01000 (0dB) LINEINR input gain similar to LINEINLVOL 15 L2H 1 Mute LINEIN path to headphone mixer 1: Mute, 0: No mute (ON) 14 L2S 1 Mute LINEIN path to speaker mixer 1: Mute, 0: No mute (ON) 10h 13 L2P 1 Mute LINEIN path to phone mixer 1: Mute, 0: No mute (ON) Table 2 Line Input Control MICROPHONE INPUT The MIC1 and MIC2 inputs are designed for direct connection to single-ended mono, stereo or differential mono microphone. If the microphone is mono, the same signal appears on both left and right channels. In stereo mode, MIC1 is routed to the left and MIC2 to the right channel. For voice recording, the microphone signal is directly connected to the record selector. The record PGA adjusts the recording volume, controlled by register 1Ch or by the ALC function. For analogue mixing, the signal passes through a separate PGA, controlled by register 0Eh. The microphone signal can be routed into the phone mixer (for normal phone call operation) and/or the headphone mixer (using register 14h, see “Audio Mixers / Sidetone Control” section), but not into the speaker mixer (to prevent acoustic feedback from the speaker into the microphone). When the microphone inputs are not used, the microphone PGA can be switched off to save power (see “Power Management” section). MIC1 and MIC2 are biased internally to the reference voltage VREF. Whenever the inputs are muted or the device placed into standby mode, the inputs remain biased to VREF using special anti-thump circuitry to suppress any audible clicks when changing inputs. |
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