TAS5508B

8 通道数字音频 PWM 处理器

The is an 8-channel digital pulse-width modulator PWM that provides both advanced performance and a high level of system integration. The TAS5508B is designed to interface seamlessly with most audio digital signal processors. The TAS5508B automatically adjusts control configurations in response to clock and data rate changes and idle conditions. This enables the TAS5508B to provide an easy-to-use control interface with relaxed timing requirements.

The TAS5508B can drive eight channels of H-bridge power stages. Texas Instruments power stage parts TAS5111, TAS5112, or TAS5182 with FETs are designed to work seamlessly with the TAS5508B. The TAS5508B supports either the single-ended or bridge-tied-load configuration. The TAS5508B also provides a high-performance, differential output to drive an external, differential-input, analog headphone amplifier such as the TPA112.

The TAS5508B uses AD modulation operating at a 384-kHz switching rate for 48-, 96-, and

192-kHz data. The 8× oversampling combined with the fifth-order noise shaper provides a broad, flat noise floor and excellent dynamic range from 20 Hz to 20 kHz.

The TAS5508B is a clocked slave-only device. The TAS5508B receives MCLK, SCLK, and LRCLK from other system components. The TAS5508B accepts master clock rates of 128, 192, 256, 384, 512, and 768 fS. The TAS5508B accepts a 64-fS bit clock.

The TAS5508B allows for extending the dynamic range by providing a power-supply, volume-control PSVC output signal.

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General Features

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Automated Operation With an Easy-to-Use

Control Interface

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I2C Serial-Control Slave Interface

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Integrated AM Interference-Avoidance Circuitry

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Single, 3.3-V Power Supply

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64-Pin TQFP Package

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5-V Tolerant Inputs

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Audio Input/Output

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Automatic Master-Clock-Rate and

Data-Sample-Rate Detection

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Eight Serial Audio Input Channels

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Eight PWM Audio Output Channels Configurable as

Six Channels With Stereo Lineout or Eight Channels

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Line Output Is a PWM Output to Drive an External

Differential-Input Operational Amplifier

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Headphone PWM Output to Drive an External

Differential Amplifier Like the TPA112

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PWM Outputs Support Single-Ended and

Bridge-Tied Loads

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32-, 38-, 44.1-, 48-, 88.2-, 96-, 176.4-, and

192-kHz Sampling Rates

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Data Formats: 16-, 20-, or 24-Bit Left-Justified,

I2S, or Right-Justified Input Data

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64-fS Bit-Clock Rate

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128-, 192-, 256-, 384-, 512-, and 768-fS Master

Clock Rates Up to a Maximum of 50 MHz

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Audio Processing

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48-Bit Processing Architecture With 76 Bits

of Precision for Most Audio-Processing Features

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Volume Control Range 36 dB to –109 dB

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Master Volume Control Range of 18 dB

to –109 dB

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Eight Individual Channel Volume Control

Ranges of 18 dB to –109 dB

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Programmable Soft Volume and Mute Update Rates

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Four Bass and Treble Tone Controls With ±18-dB Range,

Selectable Corner Frequencies, and Second-Order Slopes

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L, R, and C

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LS, RS

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LR, RR

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Sub

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Configurable Loudness Compensation

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Two Dynamic Range Compressors With Two Thresholds,

Two Offsets, and Three Slopes

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Seven Biquads Per Channel

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Full 8×8 Input Crossbar Mixer. Each Signal-Processing

Channel Input Can Be Any Ratio of the Eight Input Channels.

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8×2 Output Mixer, Channels 1–6. Each Output is

Mix of Any Two Signal-Processed Channels. It is Recommended

to Use the Pass-Through Output Mixer Configuration.

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8×3 Output Mixer, Channels 7 and 8. Each Output Is a

Mix of Any Three Signal-Processed Channels. It Is Recommended

to Use the Pass-Through Output Mixer Configuration.

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Three Coefficient Sets Stored on the Device Can Be

Selected Manually or Automatically Based on Specific

Data Rates.

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DC Blocking Filters

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Able to Support a Variety of Bass Management Algorithms

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PWM Processing

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32-Bit Processing PWM Architecture With 40 Bits

of Precision

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8× Oversampling With Fifth-Order Noise Shaping at

32 kHz–48 kHz, 4× Oversampling at 88.2 kHz and

96 kHz, and 2× Oversampling at 176.4 kHz and 192 kHz

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>102-dB Dynamic Range

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THD+N < 0.1%

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20-Hz–20-kHz, Flat Noise Floor for 44.1-, 48-, 88.2-,

96-, 176.4-, and 192-kHz Data Rates

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Digital De-Emphasis for 32-, 44.1-, and 48-kHz Data Rates

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Flexible Automute Logic With Programmable Threshold

and Duration for Noise-Free Operation

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Intelligent AM Interference-Avoidance System Provides

Clear AM Reception

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Power-Supply Volume Control PSVC Support for Enhanced

Dynamic Range in High-Performance Applications

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Adjustable Modulation Limit

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