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LM49352 数据表(PDF) 44 Page - Texas Instruments |
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LM49352 数据表(HTML) 44 Page - Texas Instruments |
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44 / 106 page  LM49352 SNAS467E – MARCH 2009 – REVISED MARCH 2013 www.ti.com Table 23. MONO_LEVEL (0x19h) Bits Field Description 5:0 MONO_LEVEL This programs the MONO input level. All gain changes are performed at zero crossings. MONO_LEVEL Level MONO_LEVEL Level 000000 –46.5dB 100000 1.5dB 000001 –45dB 100001 3dB 000010 –43.5dB 100010 4.5dB 000011 –42dB 100011 6dB 000100 –40.5dB 100100 7.5dB 000101 –39dB 100101 9dB 000110 –37.5dB 100110 10.5dB 000111 –36dB 100111 12dB 001000 –34.5dB 101000 13.5dB 001001 –33dB 101001 15dB 001010 –31.5dB 101010 16.5dB 001011 –30dB 101011 18dB 001100 –28.5dB 001101 –27dB 001110 –25.5dB 001111 –24dB 010000 –22.5dB 010001 –21dB 010010 –19.5dB 010011 –18dB 010100 –16.5dB 010101 –15dB 010110 –13.5dB 010111 –12dB 011000 –10.5dB 011000 –9dB 011001 –7.5dB 011010 –6dB 011100 –4.5dB 011101 –3dB 011110 –1.5dB 011111 0dB 6 SE/DIFF If set, the MONO– input is ignored. In single-ended mode, the MONO- input pin should be left floating. 7 AUXL_MONO If set, AUXL is routed to the MONO Input Amplifier. Headphone Detection Circuit The LM49352 features a headphone detection circuit (HDC) that automatically enables the headphone amplifier whenever the insertion of a headphone plug is detected and disables the headphone amplifier during the removal of a headphone plug. The HDC optimizes power management by automatically disabling any output amplifier that is not in use. The HDC eliminates the necessity of polling the I2C bus for status changes. However, since the HDC requires the use of the GPIO pin, the PORT2_SDO functionality sensing is required. The HDC requires a headphone jack with a normally closed mechanical switch and a pullup resistor, RPU, tied between the mechanical switch and I/O_VDD (Refer to Figure 60). Choosing a RPU value of at least 500kΩ ensures minimal current draw through the pullup resistor. When the headphone amplifier is disabled, an internal 50k Ω pulldown, RPD, is connected to each headphone amplifier output. Without the presence of a headphone plug, the headphone jack’s mechanical switch is closed thereby connecting the right headphone amplifier output 44 Submit Documentation Feedback Copyright © 2009–2013, Texas Instruments Incorporated Product Folder Links: LM49352 |
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