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TAS5548DCAR Datasheet(PDF) 36 Page - Texas Instruments |
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TAS5548DCAR Datasheet(HTML) 36 Page - Texas Instruments |
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36 / 116 page  TAS5548 SLES270A – NOVEMBER 2012 – REVISED APRIL 2015 www.ti.com Table 8. Bass and Treble Filter Selections 3-dB CORNER FREQUENCIES, Hz fS FILTER SET 1 FILTER SET 2 FILTER SET 3 FILTER SET 4 FILTER SET 5 (kHz) BASS TREBLE BASS TREBLE BASS TREBLE BASS TREBLE BASS TREBLE 88.2 115 2527 230 5053 345 8269 402 10106 459 11944 96 125 2750 250 5500 375 9000 438 11000 500 13000 176.4 230 5053 459 10106 689 16538 804 20213 919 23888 192 250 5500 500 11000 750 18000 875 22000 1000 26000 The I2C registers that control bass and treble are: • Bass and treble bypass register (0x89–0x90, channels 1–8) • Bass and treble slew rates (0xD0) • Bass filter sets 1–5 (0xDA) • Bass filter index (0xDB) • Treble filter sets 1–5 (0xDC) • Treble filter index (0xDD) NOTE The bass and treble bypass registers (0x89–0x90) are defaulted to the bypass mode. In order to use the bass and treble, these registers must be in the inline (or enabled) mode for each channel using bass and treble. 7.4.14 Volume, Automute, and Mute The TAS5548 provides individual channel and master volume controls. Each control provides an adjustment range of 18 dB to –127 dB in 0.25-dB increments. This permits a total volume device control range of 36 dB to –127 dB plus mute. The master volume control can be configured to control six or eight channels. The TAS5548 has a master soft mute control that can be enabled by a terminal or I2C command. The device also has individual channel soft mute controls that are enabled via I2C. 7.4.15 Loudness Compensation The loudness compensation function compensates for the Fletcher-Munson loudness curves. The TAS5548 loudness implementation tracks the volume control setting to provide spectral compensation for weak low- or high-frequency response at low volume levels. For the volume tracking function, both linear and logarithmic control laws can be implemented. Any biquad filter response can be used to provide the desired loudness curve. The control parameters for the loudness control are programmable via the I2C interface. The TAS5548 has a single set of loudness controls for the eight channels. In 6-channel mode, loudness is available to the six speaker outputs and also to the line outputs. The loudness control input uses the maximum individual master volume (V) to control the loudness that is applied to all channels. In the 192-kHz and 176.4-kHz modes, the loudness function is active only for channels 1, 2, and 8. 36 Submit Documentation Feedback Copyright © 2012–2015, Texas Instruments Incorporated Product Folder Links: TAS5548 |
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