Texas Instruments TAS5508CPAG

Overview

TAS5508CPAG from Texas Instruments is an 8-channel digital audio PWM processor with integrated digital audio processing (DAP), I²C control interface, and programmable biquad filters. It supports sample rates up to 192 kHz, delivers >100 dB SNR, and implements dynamic range control (DRC), loudness compensation, and AM interference avoidance for high-fidelity Class-D amplifier systems.

For engineers reviewing the TAS5508CPAG datasheet, TAS5508CPAG pinout, TAS5508CPAG application, or TAS5508CPAG equivalent, key selection criteria include its 8-channel PWM output capability, I²C-configurable DAP architecture, 28-bit/48-bit coefficient precision, and support for I²S, left-justified, and right-justified serial audio formats in consumer AV receivers and multi-zone audio systems.

Technical Context

The TAS5508CPAG integrates a fully programmable digital audio processor with dual-bank register architecture enabling seamless coefficient updates without audio interruption. Its DAP includes input crossbar mixer, eight independent biquad filter sections per channel, bass/treble controls, volume/automute logic, and two-stage DRC with separate control for channels 1–7 and channel 8.

It features a PLL-based clock generator supporting master/slave operation across 32–192 kHz sample rates, PSVC (power-supply volume control) for gain compensation against rail variation, and de-emphasis filtering compliant with CD and DAT standards. The device uses 5.23 and 25.23 fixed-point number formats for coefficient storage and arithmetic.

Key Specifications

Pinout & Package

Package: TQFP-64 (10 mm × 10 mm, 0.5 mm pitch), RoHS-compliant, thermally enhanced for audio power stage integration.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 8-channel digital audio processor applications.

Compared with TAS5508CPAG, TAS5518PAP offers higher coefficient resolution and lower noise floor while maintaining drop-in replacement capability, whereas CS497016-CQZ provides programmable architecture at the cost of increased firmware development effort and board space.

Availability

TAS5508CPAG is available at Aetrix Electronics and suitable for home theater receivers, commercial multi-zone audio systems, studio monitoring controllers, and high-end soundbars requiring stable component supply and long-term industrial availability.

Supply support for TAS5508CPAG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and digital signal technologies with over 50 years of innovation in audio and power management ICs.

The TAS5508CPAG belongs to TI's PurePath™ Ultra-HD audio processor family, designed specifically for high-fidelity, low-latency digital audio processing in premium consumer and professional audio equipment.

FAQ

What is the primary function of the TAS5508CPAG in an audio system?

The TAS5508CPAG serves as a dedicated 8-channel digital audio processor that performs real-time signal conditioning-including mixing, equalization, dynamic range control, loudness compensation, and PWM generation-for Class-D amplifier systems. It replaces discrete DSP+FPGA+PWM controller combinations with a single, I²C-configurable IC optimized for high-SNR, low-latency audio reproduction. Its architecture enables precise channel alignment and consistent output level control across varying supply conditions.

Does the TAS5508CPAG support I²S, left-justified, and right-justified audio formats?

Yes, the TAS5508CPAG supports all three standard serial audio formats via its LRCLK/BCLK/DIN interface. Configuration is controlled through the Serial Data Interface Control Register (0x0E), allowing selection of I²S (default), left-justified, or right-justified modes at sample rates from 32 kHz to 192 kHz. Each format supports 16–32 bit word lengths and master/slave clocking, making TAS5508CPAG compatible with a wide range of audio SoCs, ADCs, and transport interfaces.

How does the TAS5508CPAG implement dynamic range control (DRC)?

The TAS5508CPAG implements two independent DRC engines: DRC1 for channels 1–7 and DRC2 for channel 8. Each engine uses configurable threshold, ratio, attack, and release parameters stored in dedicated registers (0x96–0xA9). DRC1 applies symmetric compression across main channels, while DRC2 allows tailored treatment of the LFE channel-enabling deeper bass extension without clipping. Both engines operate in the digital domain before PWM modulation, preserving signal integrity.

What is the purpose of the BKND_ERR pin on the TAS5508CPAG?

The BKND_ERR pin is an open-drain output that signals fault conditions from the connected Class-D power stage, such as overcurrent, thermal shutdown, or undervoltage lockout. When asserted, it triggers automatic mute and can be monitored by the host microcontroller via GPIO polling or interrupt. This enables fail-safe behavior in TAS5508CPAG-based systems-preventing damage to speakers or amplifiers during abnormal operating conditions without requiring external supervision circuitry.

Can the TAS5508CPAG perform loudness compensation, and how is it configured?

Yes, the TAS5508CPAG includes programmable loudness compensation aligned with the Fletcher-Munson equal-loudness contour. It is configured using five dedicated registers (0x91–0x95) that define frequency breakpoints, gain offsets, and slope parameters. Default settings provide 10 dB bass boost and 4 dB treble boost at -20 dBFS, scaling inversely with signal level. This feature ensures balanced tonal perception at low listening volumes-critical for nighttime use in home theater and soundbar applications using TAS5508CPAG.