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WM9711 Datasheet(PDF) 15 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 15 Page - Wolfson Microelectronics plc |
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15 / 66 page  Production Data WM9711L w PD Rev 4.1 April 2004 15 It is also possible to use the LINEINL and LINEINR pins as a second differential microphone input. This is achieved by setting the DS bit (register 5Ch, bit 11) to ‘1’. This disables the line-in audio paths and routes the signal from LINEINL and LINEINR through the differential mic path, as if it came from the MIC1 and MIC2 pins. Only one differential microphone be used at a time. The DS bit only has an effect when MS = 01 (differential mode). REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 14 M12P 1 Mute MIC1 path to phone mixer 1: Mute, 0: No mute (ON) 13 M22P 1 Mute MIC2 path to phone mixer 1: Mute, 0: No mute (ON) 12:8 LMICVOL 01000 (0dB) Left microphone volume Only used when MS = 11 Similar to MICVOL 7 20dB 0 Microphone gain boost (Note 1) 1: 20dB boost ON 0: No boost (0dB gain) Microphone mode select 00 Single-ended mono (left) left = right = MIC1 (pin 21) Volume controlled by MICVOL 01 Differential mono mode left = right = MIC1 – MIC2 Volume controlled by MICVOL 10 Single-ended mono (right) left = right = MIC2 (pin 22) Volume controlled by MICVOL 6:5 MS 00 11 : Stereo mode MIC1 = left, MIC2 = right Left Volume controlled by LMICVOL Right volume controlled by MICVOL 0Eh Mic Volume 4:0 MICVOL 01000 (0dB) Microphone volume to mixers 00000: +12dB … (1.5dB steps) 11111: -34.5dB Reg 5Ch Additional Analogue Functions 8 DS 0 Differential Microphone Select 0 : Use MIC1 and MIC2 1: Use LINEL and LINER (Note 2) Table 3 Microphone Input Control Note: 1. The 20dB gain boost acts on the input to the phone mixer only. A separate microphone boost for recording can be enabled using the BOOST bit in register 1Ah. 2. When the LINEL and LINER are selected for differential microphone select then the MIC1 and MIC2 input pins become disabled, these signals can therefore not be routed internally to the device. MICROPHONE BIAS The MICBIAS output (pin 28) provides a low noise reference voltage suitable for biasing electret type microphones and the associated external resistor biasing network. The internal MICBIAS circuitry is shown below. Note that the maximum source current capability for MICBIAS is 3mA. The external biasing resistors and microphone cartridge therefore must limit the MICBIAS current to 3mA. |
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