TAS5518 datasheet(38/102 Pages) TI

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Introduction

SLES115 — August 2004

TAS5518

1.12 Output Mixer

The TAS5518 provides an 8x2 output mixer for channels 1, 2, 3, 4, 5, and 6. For channels 7 and 8 the TAS5518

provides an 8x3 output mixer. These mixers allow each output to be any ratio of any two (three) signal

processed channels. The control parameters for the output crossbar mixer are programmable via the I2C

interface.

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 1−21. Output Mixers

1.13 PWM

The TAS5518 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 TAS5518 device uses noise-shaping and sophisticated error correction algorithms to achieve high power

efficiency and high-performance digital audio reproduction. The TAS5518 uses an AD1 PWM modulation

combined with a 5th order noise shaper to provide a 110-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 TAS5518 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.

The PWM section also contains the power supply volume control (PSVC) PWM.

TAS5518 Datasheet(PDF) 38 Page - Texas Instruments

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