TAS5504_06 datasheet(36/96 Pages) TI

36 / 96 page

Introduction

SLES123 − October 2004

TAS5504

Output

Gain Coefficient

Select

Output

Gain Coefficient

Output

Gain Coefficient

1 or 2

Select

Output

Select

Output

Select

Output

Select

Output

3 or 4

Figure 1−20. Output Mixers

1.12 PWM

The TAS5504 has four channels of high performance digital PWM modulators that are designed to drive

switching output stages (backends) in both single-ended (SE) and H-bridge (bridge tied load) configuration.

The TAS5504 device uses noise-shaping and sophisticated error correction algorithms to achieve high power

efficiency and high-performance digital audio reproduction. The TAS5504 uses an AD1 PWM modulation

combined with a 5th order noise shaper to provide a 102-dB SNR from 20 to 20 kHz.

The PWM section accepts 32-bit PCM data from the DAP and outputs four PWM audio output channels.

The TAS5504 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 will not

operate while the backend drive channels are operating. The headphone will be 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.

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 8x over sampling.

−

8x at FS = 44.1 kHz, 48 kHz, 32 kHz, 38 kHz

−

4x at FS = 88.2 kHz, 96 kHz

−

2x at FS = 176.4 kHz, 192 kHz

•

5th order noise shaping

•

102-dB dynamic range 0 – 20 kHz (TAS5504 + TAS5111 system measured at speaker terminals)

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