TAS5508 datasheet(19/105 Pages) TI

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2.2.3

2C Serial-Control Interface

2.2.4

Device Control

2.2.5

Digital Audio Processor (DAP)

2.2.5.1 TAS5508 Audio-Processing Configurations

TAS5508

8-Channel Digital Audio PWM Processor

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SLES091D – FEBRUARY 2004 – REVISED JULY 2009

Table 2-1. Serial Data Formats

RECEIVE SERIAL DATA FORMAT

WORD LENGTH

Right-justified

I2S

Left-justified

Serial data is input on SDIN1, SDIN2, SDIN3, and SDIN4. The TAS5508 accepts 16-, 20-, or 24-bit serial

data at 32, 38, 44.1, 48, 88.2, 96, 176.4, or 192 kHz in left-justified, I2S, or right-justified format. Data is

input using a 64-Fs SCLK clock and an MCLK rate of 128, 192, 256, 384, 512, or 768 Fs, up to a

maximum of 50 MHz. The clock speed and serial data format are I2C configurable.

The TAS5508 has an I2C serial-control slave interface (address 0x36) to receive commands from a

system controller. The serial-control interface supports both normal-speed (100 kHz) and high-speed (400

kHz) operations without wait states. Because the TAS5508 has a crystal time base, this interface operates

even when MCLK is absent.

The serial control interface supports both single-byte and multiple-byte read/write operations for status

registers and the general control registers associated with the PWM. However, for the DAP

data-processing registers, the serial control interface also supports multiple-byte (4-byte) write operations.

The I2C supports a special mode which permits I2C write operations to be broken up into multiple

data-write operations that are multiples of 4 data bytes. These are 6-byte, 10-byte, 14-byte, 18-byte, etc.,

write operations that are composed of a device address, read/write bit, subaddress, and any multiple of 4

bytes of data. This permits the system to incrementally write large register values without blocking other

I2C transactions. In order to use this feature, the first block of data is written to the target I2C address, and

each subsequent block of data is written to a special append register (0xFE) until all the data is written

and a stop bit is sent. An incremental read operation is not supported.

The TAS5508 control section provides the control and sequencing for the TAS5508. The device control

provides both high- and low-level control for the serial control interface, clock and serial data interfaces,

digital audio processor, and pulse-width modulator sections.

The DAP arithmetic unit is used to implement all audio-processing functions: soft volume, loudness

compensation, bass and treble processing, dynamic range control, channel filtering, input and output

mixing. Figure 2-3 shows the TAS5508 DAP architecture.

The DAP accepts 24-bit data from the serial data interface and outputs 32-bit data to the PWM section.

The DAP supports two configurations, one for 32-kHz to 96-kHz data and one for 176.4-kHz to 192-kHz

data.

The 32-kHz to 96-kHz configuration supports eight channels of data processing that can be configured

either as eight channels, or as six channels with two channels for separate stereo line outputs.

The 176.4-kHz to 192-kHz configuration supports three channels of signal processing with five channels

passed though (or derived from the three processed channels).

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