TAS5508C datasheet(39/107 Pages) TI

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Gain Coefficient

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Output

Gain Coefficient

Output

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Output

1, 2, 3, 4, 5, or 6

Gain Coefficient

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Output

Gain Coefficient

Output

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Output

7 or 8

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M0011-02

TAS5508C

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SLES257 – SEPTEMBER 2010

Figure 2-18. Output Mixers

2.12 PWM

The TAS5508C 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 H-bridge (bridge-tied load)

configurations. The TAS5508C device uses noise-shaping and sophisticated, error-correction algorithms

to achieve high power efficiency and high-performance digital audio reproduction. The TAS5508C uses an

AD1 PWM modulation scheme combined with a fifth-order noise shaper to provide a 102-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 TAS5508C PWM section output supports both single-ended and bridge-tied loads.

The PWM section provides a headphone PWM output to drive an external differential amplifier like the

TPA112. 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 or I2C command.

The PWM section has individual channel dc blocking filters that can be enabled and disabled. The filter

cutoff frequency is less than 1 Hz.

The PWM section has individual channel de-emphasis filters for 32, 44.1, and 48 kHz that can be enabled

and disabled.

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