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WM8987L Datasheet(PDF) 17 Page - Wolfson Microelectronics plc |
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WM8987L Datasheet(HTML) 17 Page - Wolfson Microelectronics plc |
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17 / 58 page  Pre-Production WM8987L w PP Rev 3.0 January 2007 17 As an example, the WM8987L can be set up to convert one differential and one single ended mono signal by applying the differential signal to LINPUT1/RINPUT1 and the single ended signal to RINPUT2. By setting LINSEL to L-R Differential (see Table 4), DS to LINPUT1 - RINPUT1 and RINSEL to RINPUT2, each mono signal can then be routed to a separate ADC or Bypass pat The signal inputs are biased internally to the reference voltage VREF. Whenever the line inputs are muted or the device placed into standby mode, the inputs are kept biased to VREF using special anti-thump circuitry. This reduces any audible clicks that may otherwise be heard when changing inputs. DC MEASUREMENT For DC measurements (for example, battery voltage monitoring), the input signal at the LINPUT1 and/or RINPUT1 pins can be taken directly into the respective ADC, bypassing both PGA and microphone boost. The ADC output then becomes unsigned relative to AVDD, instead of being a signed (two’s complement) number relative to VREF. Setting L/RDCM will override L/RINSEL. The input range for dc measurement is AGND to AVDD. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 7:6 LINSEL 00 Left Channel Input Select 00 = LINPUT1 01 = LINPUT2 10 = Reserved 11 = L-R Differential (either LINPUT1- RINPUT1 or LINPUT2-RINPUT2, selected by DS) R32 (20h) ADC Signal Path Control (Left) 5:4 LMICBOOST 00 Left Channel Microphone Gain Boost 00 = Boost off (bypassed) 01 = 13dB boost 10 = 20dB boost 11 = 29dB boost 7:6 RINSEL 00 Right Channel Input Select 00 = RINPUT1 01 = RINPUT2 10 = Reserved 11 = L-R Differential (either LINPUT1- RINPUT1 or LINPUT2-RINPUT2, selected by DS) R33 (21h) ADC Signal Path Control (Right) 5:4 RMICBOOST 00 Right Channel Microphone Gain Boost 00 = Boost off (bypassed) 01 = 13dB boost 10 = 20dB boost 11 = 29dB boost Table 4 Input Software Control REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 5 RDCM 0 Right Channel DC Measurement 0 = Normal Operation, PGA Enabled 1 = Measure DC level on RINPUT1 R31 (1Fh) ADC input Mode 4 LDCM 0 Left Channel DC Measurement 0 = Normal Operation, PGA Enabled 1 = Measure DC level on LINPUT1 Table 5 DC Measurement Select |
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