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WM8737CLGEFL/R Datasheet(PDF) 21 Page - Wolfson Microelectronics plc |
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WM8737CLGEFL/R Datasheet(HTML) 21 Page - Wolfson Microelectronics plc |
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21 / 40 page  Production Data WM8737L w PD, Rev 4.4, January 2012 21 Note: The 3D enhancement function is not supported at sample frequencies of 88.2kHz, 88.235kHz, and 96kHz. When using these sample frequencies the 3D enhancement function should be bypassed by first setting register R13 (0Dh) to 1_110x_xxxx (1C0h), where x_xxxx represents the required values for the ALC in the application, and then setting register R28 (1Ch) to 0_0000_0100 (004h). Note that the above sequence uses test bits that are not documented and the use of these test bits, other than as described above, is not recommended and is not supported. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R4 (04h) 3D Control 0 3DEN 0 3D function enable 0: disable 1: enable 4:1 3DDEPTH[3:0] 0000 Stereo depth 0000: 0% (minimum 3D effect) 0001: 6.67% .... 1110: 93.3% 1111: 100% (maximum 3D effect) 5 3DUC 0 Upper Cut-off frequency 0 = High (2.2kHz at 48kHz sampling) 1 = Low (1.5kHz at 48kHz sampling) 6 3DLC 0 Lower Cut-off frequency 0 = Low (200Hz at 48kHz sampling) 1 = High (500Hz at 48kHz sampling) 7 DIV2 0 ADC 6dB attenuate enable 0: disabled (0dB) 1: -6dB enabled Table 11 Stereo Enhancement Control AUTOMATIC LEVEL CONTROL (ALC) The WM8737L has an automatic level control that aims to keep a constant recording volume irrespective of the input signal level. This is achieved by continuously adjusting the PGA gain so that the signal level at the ADC input remains constant. A digital peak detector monitors the ADC output and changes the PGA gain if necessary. hold time decay time attack time input signal signal after ALC PGA gain ALC target level Figure 8 ALC Operation |
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