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WM9711 Datasheet(PDF) 29 Page - Wolfson Microelectronics plc |
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WM9711 Datasheet(HTML) 29 Page - Wolfson Microelectronics plc |
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29 / 66 page  Production Data WM9711L w PD Rev 4.1 April 2004 29 EAR SPEAKER OUTPUT – OUT3 Pin 37 (OUT3) has a buffer that can drive load impedances down to 16 Ω. It can be used to: • Drive an ear speaker (phone receiver). The speaker can be connected differentially between OUT3 and HPOUTL, or in single-ended configuration (OUT3 to HPGND). The ear speaker output is produced by the headphone mixer. The right signal must be inverted (OUT3INV = 1), so that the left and right channel are mixed to mono in the speaker [L–(-R) = L+R]. • Eliminate the DC blocking capacitors on HPOUTL and HPOUTR. In this configuration, OUT3 produces a buffered midrail voltage (AVDD/2) and is connected to the headphone socket’s ground pin (see “Applications Information”) • Produce the inverse of the MONOOUT signal, for a differential mono output. Note: OUT3 can only handle one of the above functions at any given time. REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 15 MUTE 1 Mute OUT3 1: Mute (Buffer OFF) 0: No Mute (Buffer ON) Source of OUT3 signal 00 inverse of HPOUTR (for BTL ear speaker) 01 VREF (for capless headphone drive) 10 mono mix of both headphone channels (for single-ended ear speaker) 10:9 OUT3 SRC 00 11 inverse of MONOOUT (for differential mono output) 7 ZC 0 Zero Cross Enable 0: Change gain immediately 1: Change gain only on zero crossings, or after time-out 16h OUT3 Control 5:0 OUT3 VOL 000000 (0dB) OUT3 Volume 000000: 0dB (maximum) 000001: -1.5dB … (1.5dB steps) 011111: -46.5dB 1xxxxx: -46.5dB Table 16 OUT3 Control |
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