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WM8941 Datasheet(PDF) 54 Page - Wolfson Microelectronics plc |
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WM8941 Datasheet(HTML) 54 Page - Wolfson Microelectronics plc |
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54 / 96 page  WM8941 Pre Production w PP, Rev 3.3, December 2007 54 WM8941 Video Buffer Filter Response -25 -20 -15 -10 -5 0 5 10 10 100 1000 10000 100000 Frequency (kHz) 0dB 0dB Qboost 6dB 6dB Qboost -20dBV sinewave input, 0dB gain setting, VBVDD=3.3V Figure 26 WM8941 Video Buffer Filter Response VIDEO BUFFER REGISTERS Video buffer enable / disable and gain are controlled via the following registers: REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R3 Power management 3 4 VBUFEN 0 Video buffer enable 0 = disabled 1 = enabled 4 QBOOST 0 Increases the filters Q. 3 VBGAIN 0 Video buffer gain 0 = 0dB (=6dB unloaded) 1 = +6dB (=12dB unloaded) 2 VBDISOFF 0 Disable Video Buffer DC Offset 0 = Video buffer drives down to 40mV above ground 1 = Video buffer drives to ground (not recommended) 1 VBPULLDWN 0 Video Buffer Pull-down 0=Normal 1=Enables high impedance pull-down on in put to Video buffer R40 Video Buffer 0 VBCLAMPEN 0 Video buffer clamp enable 0 = disabled 1 = enabled Table 43 Video Buffer Registers |
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