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WM8961 Datasheet(PDF) 44 Page - Wolfson Microelectronics plc |
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WM8961 Datasheet(HTML) 44 Page - Wolfson Microelectronics plc |
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44 / 116 page  WM8961 Pre-Production w PP, August 2009, Rev 3.1 44 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R71 (47h) Analogue HP 2 8:6 HPL_VOL[2:0] 111 Secondary HPL PGA Volume 111 0dB (default) 110 -1dB 101 -2dB 100 -3dB 011 -4dB 010 -5dB 001 -6dB 000 -7dB 5:3 HPR_VOL[2:0] 111 Secondary HPR PGA Volume 111 0dB (default) 110 -1dB 101 -2dB 100 -3dB 011 -4dB 010 -5dB 001 -6dB 000 -7dB Table 29 Headphone Output Drive Volume Control HEADPHONE OUTPUT ENABLE The staged enabling of the headphone outputs can be controlled using register R69. The HPL_ENA and HPR_ENA enable the headphone amplifiers. The HPL_ENA_OUTP and HPR_ENA_OUTP should be enabled following any offset cancellation by the DC Servo. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION R69 (45h) Analogue HP 0 7 HPL_RMV_SHORT 0 Left channel output short removal: set after output stage has been enabled 6 HPL_ENA_OUTP 0 Enables left channel output stage; set after offset cancellation is done 5 HPL_ENA_DLY 0 delayed left channel enable, set with at least 20us delay to HPL_ENA; reset together with HPL_ENA 4 HPL_ENA 0 Enables left headphone amplifier channel 3 HPR_RMV_SHORT 0 right channel output short removal: set after output stage has been enabled 2 HPR_ENA_OUTP 0 enables right channel output stage; set after offset cancellation is done 1 HPR_ENA_DLY 0 delayed right channel enable, set with at least 20us delay to HPR_ENA; reset together with HPR_ENA 0 HPR_ENA 0 Enables right headphone amplifier channel Table 30 Headphone Output Enable Control HEADPHONE OUTPUT CIRCUIT It is recommended that the HP-L and HP_R is connected to a zobel network consisting of a 20Ω resistor (5% tolerance) and a 100nF capacitor (20% tolerance). This ensures the stability of the headphone output amplifier. This is also illustrated in Figure 19. |
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