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TAS5548 Datasheet(PDF) 34 Page - Texas Instruments |
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TAS5548 Datasheet(HTML) 34 Page - Texas Instruments |
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34 / 120 page  TAS5548 SLES270 – NOVEMBER 2012 www.ti.com 4 PWM 4.1 PWM Features The TAS5548 has eight channels of high-performance digital PWM modulators that are designed to drive switching output stages (back ends) in both single-ended (SE) and bridge-tied-load (BTL) configurations. The device uses noise-shaping and sophisticated, error-correction algorithms to achieve high power efficiency and high-performance digital audio reproduction. The TAS5548 uses an AD/BD/Ternary PWM modulation scheme combined with a fourth-order noise shaper to provide a >105-dB SNR from 20 Hz to 20 kHz. The PWM section accepts 32-bit PCM data from the DAP and outputs eight PWM audio output channels configurable as either: • Six channels to drive power stages and two channels to drive a differential-input active filter to provide a separately controllable stereo lineout • Eight channels to drive power stages The PWM section provides a headphone PWM output to drive an external differential amplifier like the TPA6139A2. The headphone circuit uses the PWM modulator for channels 1 and 2. The headphone does not operate while the six or eight back-end drive channels are operating. The headphone is enabled via a headphone-select terminal. The PWM section also contains the power-supply volume control (PSVC) PWM. The interpolator, noise shaper, and PWM sections provide a PWM output with the following features: • Up to 8× oversampling – 4× at fS = 88.2 kHz, 96 kHz – 2× at fS = 176.4 kHz, 192 kHz • Fourth-order noise shaping • 105-dB dynamic range 0–20 kHz (TAS5548 + TAS5614 system measured at speaker terminals) • THD < 0.01% • Adjustable modulation limit of 87.4% to 99.2% • 3.3-V digital signal 4.1.1 DC Blocking (High-Pass Filter Enable/Disable) Each input channel incorporates a first-order, digital, high-pass filter to block potential dc components. The filter –3-dB point is approximately 2-Hz at the 96-kHz sampling rate. The high-pass filter can be enabled and disabled via the I2C system control register 1 (0x03 bit D7). The default setting is 1 (high-pass filter enabled). 4.1.2 AM Interference Avoidance Digital amplifiers can degrade AM reception as a result of their RF emissions. Texas Instruments' patented AM interference-avoidance circuit provides a flexible system solution for a wide variety of digital audio architectures. During AM reception, the TAS5548 adjusts the radiated emissions to provide an emission- clear zone for the tuned AM frequency. The inputs to the TAS5548 for this operation are the tuned AM frequency, the IF frequency, and the sample rate. This PWM rate modification is done by modifying the output rate of the Sample Rate Converter, and the following DSP and PWM modulator. 34 PWM Copyright © 2012, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: TAS5548 |
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