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WM8961GEFL/V Datasheet(PDF) 24 Page - Wolfson Microelectronics plc |
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WM8961GEFL/V Datasheet(HTML) 24 Page - Wolfson Microelectronics plc |
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24 / 116 page  WM8961 Pre-Production w PP, August 2009, Rev 3.1 24 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R1 (01h) Right Channel PGA 8 IPVU 0 Input PGA Volume Update 0 = Store RINVOL in intermediate latch (no gain change) 1 = Update left and right channel gains (right = RINVOL, left = intermediate latch) 7 RINMUTE 1 Right Input PGA Analogue Mute 1 = Enable Mute 0 = Disable Mute Note: IPVU must be set to un- mute. 6 RIZC 0 Right Input PGA Zero Cross Detector. Requires separate register write before volume setting. 1 = Change gain on zero cross only 0 = Change gain immediately 5:0 RINVOL [5:0] 011111 ( 0dB ) Right Input PGA Volume Control 111111 = +24dB 111110 = +23.25dB . . 0.75dB steps down to 000000 = -23.25dB R23 (17h) Additional control(1) 0 TOEN 0 Timeout Enable 0 = Timeout disabled 1 = Timeout enabled R30 (1Eh) Clocking 3 8:7 CLK_TO_DIV[1:0] 00 Timeout/slow clock divider setting 00 : 125Hz ( timeout = 8ms) 01 : 250Hz ( timeout = 4ms) 10 : 500Hz ( timeout = 2ms) 11 : 1kHz ( timeout = 1ms) Table 6 Input PGA Volume Control See "Volume Updates" section for a more detailed description of the volume update function, the zero cross function and the timeout operation INPUT BOOST STAGE The output of the PGA volume control stage is fed to the boost stage input. The input boost amplifier is a second order MFB active filter with selectable step gain. The boost stage provides the capability of adding large step gains to the output of the PGA. The output of the boost stage feeds into the ADC. To prevent large step outputs from the ADC, the boost gain should only be set during initial configuration. The boost stage can provide up to +29dB additional gain from the PGA output to the ADC input, providing a total maximum available analogue gain of +53dB from microphone to ADC. Microphone PGA to boost gain settings are shown in Table 7. |
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