TAS5028 datasheet(29/84 Pages) TI

29 / 84 page

Introduction

SLES112 — June 2004

TAS5028

Output

Gain Coefficient

Select

Output

Gain Coefficient

Output

Gain Coefficient

1, 2, 3, 4, 7 or 8

5 or 6

Select

Output

Select

Output

Select

Output

Select

Output

Figure 1 - 16. Output Mixers

1.10 PWM

The TAS5028 has eight 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 TAS5028 device uses noise-shaping and sophisticated error correction algorithms to achieve high power

efficiency and high-performance digital audio reproduction. The TAS5028 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 eight PWM audio output channels

configurable as either:

•

Six channels to drive power stages + two channels to drive a differential input active filter to provide a

separately controllable stereo line out

•

Eight channels to drive power stages

The TAS5028 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 six or eight 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.

TAS5028 Datasheet(PDF) 29 Page - Texas Instruments

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