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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM9712CLGEFL/V датащи(PDF) 74 Page - Wolfson Microelectronics plc |
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WM9712CLGEFL/V датащи(HTML) 74 Page - Wolfson Microelectronics plc |
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74 / 78 page  WM9712L Production Data w PD, Rev 4.6, November 2011 74 BTL LOUDSPEAKER OUTPUT LOUT2 and ROUT2 can differentially drive a mono 8 loudspeaker as shown below. LOUT2 ROUT2 WM9712L INV = 1 Stereo: V SPKR = R-(-L) = L+R Mono: V SPKR = M-(-M) = 2M ROUT2VOL LOUT2VOL -1 Figure 27 Speaker Output Connection (INV = 1) The right channel is inverted by setting the INV bit, so that the signal across the loudspeaker is the sum of left and right channels. COMBINED HEADSET / BTL EAR SPEAKER In smartphone applications with a loudspeaker and separate ear speaker (receiver), a BTL ear speaker can be connected at the OUT3 pin, as shown below. HPOUTL HPOUTR HPGND = 0V WM9712L OUT3 BTL ear speaker Figure 28 Combined Headset / BTL Ear Speaker (OUT3SRC = 00) The ear speaker and the headset play the same signal. Whenever the headset is plugged in, the headphone outputs are enabled and OUT3 disabled. When the headset is not plugged in, OUT3 is enabled (see “Jack Insertion and Auto-Switching”) COMBINED HEADSET / SINGLE-ENDED EAR SPEAKER Instead of a BTL ear speaker, a single-ended ear speaker can also be used, as shown below. HPOUTL HPOUTR HPGND = 0V WM9712L OUT3 ear speaker (single-ended) Figure 29 Combined Headset / Single-ended Ear Speaker (OUT3SRC = 01) |
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