TAS5548DCAR datasheet(27/116 Pages) TI1

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Differential voltage

-V

PWM+

PWM -

TAS5548

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SLES270A – NOVEMBER 2012 – REVISED APRIL 2015

To support efficiently the processing requirements of both multichannel 32-kHz to 96-kHz data and the 6-channel

176.4-kHz and 192-kHz data, the TAS5548 has separate audio-processing features for 32-kHz to 96-kHz data

rates and for 176.4 kHz and 192 kHz. See Table 6 for a summary of TAS5548 processing feature sets.

7.4.7.2 TAS5548 Audio-Processing Feature Sets

The audio processing architecture of the TAS5548 DAP for normal and double speed configurations is shown

below.

Table 6. TAS5548 Audio-Processing Feature Sets

32 kHz–96 kHz

176.4- and 192-kHz

FEATURE

8-CHANNEL FEATURE SET

6 + 2 LINEOUT FEATURE SET

FEATURE SET

Signal-processing channels

6 + 2

Master volume

1 for 8 channels

1 for 6 channels

1 for 4 channels

Individual channel volume

controls

Four bass and treble tone controls with

Two bass and treble tone controls

±18-dB range, programmable corner

with ±18-dB range, programmable

frequencies, and second- order slopes

corner frequencies, and second-order

L, R, and C

Bass and treble tone controls

slopes for satellite channels

LS, RS

(selectable). One Bass Control for

LBS, RBS

Sub

Sub (channel 8)

Sub

Line L and R

Biquads

1 for satellites and 1 for sub

Dynamic range compressors

1 for 7 satellites and 1 for sub

2 - 1 for 3 satellites and 1 for sub

(Line 1 and 2 Uncompressed)

Each of the eight signal-processing channels input can be any ratio of the eight input

Input/output mapping/

Channels 1, 2, 5, 6 has 4×1

channels.

mixer on the output and input

mixing

Each of the eight outputs can be any ratio of any two processed channels.

DC-blocking filters

Eight channels

(implemented in PWM section)

Digital de-emphasis

Eight channels for 32 kHz, 44.1 kHz, and

Six channels for 32 kHz, 44.1 kHz, and

N/A

(implemented in PWM section)

48 kHz

Loudness

Eight channels

Six channels

Four channels

Number of coefficient sets

Two additional coefficient sets can be stored in memory. (Bank Switching data for ASRC Bypass Mode)

stored

7.4.8 Pulse Width Modulation Schemes

TAS5548 supports three PWM modulations schemes: AD Mode, BD Mode and Ternary Mode. Ternary mode is

selected using register 0X25, bit D5. For AD and BD Modulation schemes, this bit should be set to 0. AD/BD

mode is selected via input mux registers 0X30-0X33. Following PWM timing diagram shows the three different

schemes.

Figure 20. AD Modulation

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