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WM9711 Datasheet(PDF) 60 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 60 Page - Wolfson Microelectronics plc |
60 / 66 page ![]() WM9711L Production Data w PD Rev 4.1 April 2004 60 RECOMMENDED EXTERNAL COMPONENT VALUES COMPONENT REFERENCE SUGGESTED VALUE DESCRIPTION C1 - C6 100nF De-coupling for DBVDD,DCVDD,TPVDD,AVDD,SPKVDD,HPVDD C7 - C8 10uF Reservoir capacitor for DVDD, AVDD. Should the supplies use separate sources then additional capacitors will be required of each additional source. C9 100nF De-coupling for CAP2. C10 10uF Reservoir capacitor for CAP2 C11 100nF De-coupling for VREF C12 10uF Reservoir capacitor for VREF C13 100nF De-coupling for MICBIAS - Not required if MICBIAS output is not used C14 10uF Reservoir capacitor for MICBIAS - Not required if MICBIAS output is not used C27 and C28 22pF Required when used with a parallel resonant crystal. C15 - C20 1uF AC coupling capacitors C21 - C23 2.2uF Output AC coupling capacitors to remove VREF DC level from outputs C24 - C26 220 µF Output AC coupling capacitors to remove VREF DC level from outputs. R1 100k Ω Pull-up resistor, ensures that all circuit blocks are OFF by default R2 100k Ω Pull down resistor, ensures that all circuit blocks are ON by default XT 24.576MHz AC'97 master clock frequency. A bias resistor is not required but if connected will not affect operation if the value is large (above 1M Ω) Table 36 External Components Descriptions Note: 1. For Capacitors C7, C8, C10, C12 and C14 it is recommended that very low ESR components are used. LINE OUTPUT The headphone outputs, HPOUTL and HPOUTR, can be used as stereo line outputs. The speaker outputs, LOUT2 and ROUT2, can also be used as line outputs, if ROUT2 is not inverted for BTL operation (INV = 0). Recommended external components are shown below. HPGND HPGND LINE-OUT SOCKET (LEFT) C1 1uF R1 100 Ohm HPOUTL / LOUT2 HPOUTR / ROUT2 WM9711L R2 100 Ohm LINE-OUT SOCKET (RIGHT) C2 1uF Figure 16 Recommended Circuit for Line Output The DC blocking capacitors and the load resistance together determine the lower cut-off frequency, fc. Assuming a 10 k Ω load and C1, C2 = 10µF: fc = 1 / 2 π (RL+R1) C1 = 1 / (2π x 10.1kΩ x 1µF) = 16 Hz Increasing the capacitance lowers fc, improving the bass response. Smaller values of C1 and C2 will diminish the bass response. The function of R1 and R2 is to protect the line outputs from damage when used improperly. |
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