TAS5086 datasheet(10/41 Pages) TI

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Channel-6 Processing Section

B0050-01

0x21

0x0D

BQ1(G)

0x23

Gain-

Compensated

Biquad

0x24

Low-

Pass

Biquad

VOL

10dB

BassManagement

Ch1–5

Ch6Sub

FromDownmix(L’+R’)/2

BQ1

BQ2

MUX

PWM Section

TAS5086

SLES131A – FEBRRUARY 2005 – REVISED MAY 2006

DETAILED DESCRIPTION (continued)

Channel 6 has processing features that are directly applicable to the subwoofer channel.

Figure 3. Channel-6 Processing Block Diagram

The TAS5086 has six 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 TAS5086 device uses noise-shaping and sophisticated error correction algorithms to achieve high power

efficiency and high-performance digital audio reproduction. The TAS5086 uses a fourth-order noise shaper to

provide >105-dB SNR performance from 20 Hz to 20 kHz.

The TAS5086 PWM interface is described by using the following notation:

PN + V

where

P = number of PWM signals per channel

N = number of channels

V = total number of valid signals used to reset the power stage

For example, the TAS5086 initial interface format means that there is 1 PWM signal per channel (N = 6) and 1

valid signal is used to reset the power stages. The shorthand notation to describe this is 1N+1.

The PWM section accepts 24-bit PCM data from the serial data interface and outputs six PWM audio output

channels to drive 1N+1 single-ended and BTL power stages.

The PWM interface supports:

•

TAS5186 in BTL or SE mode without any external glue logic, uses 1N+1 signaling.

•

TAS5142 in BTL or SE mode without any external glue logic, uses 1N+1 signaling.

•

TAS5111 SE without any external glue logic, and with a pulldown on the output, uses 1N+1 signaling.

•

TAS5111 BTL or TAS5112 BTL with one inverter per BTL channel of glue logic and a pulldown on the

output, uses 1N+1 signaling from TAS5086, 2N+1 input to TAS5111/12.

•

TAS5112 SE (with external glue logic)

See the application schematics for an example of the TAS5086 with the TAS5186 and the TAS5086 with

TAS5112 SE and TAS5111 SE.

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