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WM9711 Datasheet(PDF) 61 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 61 Page - Wolfson Microelectronics plc |
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61 / 66 page  Production Data WM9711L w PD Rev 4.1 April 2004 61 AC-COUPLED HEADPHONE OUTPUT The circuit diagram below shows how to connect a stereo headphone to the WM9711L. C2 220uF HPOUTL HPOUTR HPGND = 0V C1 220uF WM9711L Figure 17 Simple Headphone Output Circuit Diagram The DC blocking capacitors C1 and C2 together with the load resistance determine the lower cut-off frequency, fc. Increasing the capacitance lowers fc, improving the bass response. Smaller capacitance values will diminish the bass response. For example, with a 16 Ω load and C1 = 220µF: fc = 1 / 2 π RLC1 = 1 / (2π x 16Ω x 220µF) = 45 Hz DC COUPLED (CAPLESS) HEADPHONE OUTPUT In the interest of saving board space and cost, it may be desirable to eliminate the 220 µF DC blocking capacitors. This can be achieved by using OUT3 as a headphone pseudo-ground, as shown below. WM9711L HPOUTL HPOUTR OUT3 = AVDD/2 Figure 18 Capless Headphone Output Circuit Diagram (OUT3SRC = 10) As the OUT3 pin produces a DC voltage of AVDD/2, there is no DC offset between HPOUTL/HPOUTR and OUT3, and therefore no DC blocking capacitors are required. However, this configuration has some drawbacks: • The power consumption of the WM9711L is increased, due to the additional power consumed in the OUT3 output buffer. • If the DC coupled output is connected to the line-in of a grounded piece of equipment, then OUT3 becomes short-circuited. Although the built-in short circuit protection will prevent any damage to the WM9711L, the audio signal will not be transmitted properly. • OUT3 cannot be used for another purpose |
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