Texas Instruments TAS5548DCAR

Overview

TAS5548DCAR from Texas Instruments is an 8-channel digital audio processor (DAP) with integrated asynchronous sample rate converter (ASRC), PWM output generator, and headphone driver. It delivers 105 dB dynamic range, supports 32–192 kHz input sampling rates across two independent 4-channel ASRC banks, and drives eight differential PWM outputs plus dual differential headphone channels for Blu-ray HTiB and high-definition audio systems.

For engineers reviewing the TAS5548DCAR datasheet, TAS5548DCAR pinout, TAS5548DCAR application, or TAS5548DCAR equivalent, key selection criteria include its dual-bank ASRC latency (102.53125/FSin + 36.46875/FSout), PSVC-enabled power-supply volume control (12–24 dB range), THD+N < 0.01% at 1 kHz, and support for AD/BD/ternary modulation at 384 kHz switching rate.

Technical Context

The TAS5548DCAR implements two independent 4-channel ASRC modules enabling simultaneous processing of two distinct input sampling rates (e.g., 44.1 kHz and 48 kHz), each with passband ripple ±0.05 dB and stopband attenuation 130 dB. Its digital audio path includes eight biquad filters per channel, dual dynamic range compressors, and configurable loudness compensation.

It integrates a fourth-order noise shaper with 8× oversampling to achieve flat 20 Hz–40 kHz noise floor and >105 dB A-weighted dynamic range. Clocking relies on a 12.288 MHz external crystal, PLL with programmable filter components (PLL_FLTM/FLTP), and supports I²S master/slave modes with auto-detection from 32–192 kHz.

Key Specifications

Pinout & Package

Package: HTSSOP-56 (14.00 mm × 6.10 mm, 0.5 mm pitch). Thermal resistance R_θJA = 26.1 °C/W. Requires dedicated analog/digital ground separation (AVSS/AVSS_PWM/DVSS1/DVSS2) and low-ESR decoupling (0.1 µF + 10 µF on DVDD pins, 0.1 µF on AVDD_PWM, 4.7 µF on VR_DIG).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5548DCAR, TAS5558RTVR offers finer PSVC control and better thermal headroom in identical HTiB layouts, while CS497016-CQZ trades integration for computational flexibility-requiring external PWM drivers, separate ASRC, and custom firmware development.

Availability

TAS5548DCAR is available at Aetrix Electronics and suitable for home theater systems, Blu-ray player audio stages, and automotive infotainment head units requiring stable component supply, long-term lifecycle support, and production-grade traceability.

Supply support for TAS5548DCAR 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 processing technologies with over 50 years of innovation in audio and power management ICs.

The TAS5548DCAR belongs to TI's high-definition audio processor product line, engineered specifically for Blu-ray HTiB and premium consumer audio applications demanding DTS-HD compliance, low-latency ASRC, and integrated PWM output.

FAQ

What is the primary function of the TAS5548DCAR in an audio system?

The TAS5548DCAR serves as a complete 8-channel digital audio processor with integrated asynchronous sample rate conversion, audio mixing, tone control, dynamic range compression, and PWM output generation. It processes digital audio inputs (up to 10 channels), adapts sampling rates, applies real-time effects, and directly drives Class-D power stages or external headphone amplifiers-eliminating the need for discrete SRC, DAC, and analog volume control stages in HTiB and Blu-ray player designs.

Does the TAS5548DCAR support multiple input sampling rates simultaneously?

Yes, the TAS5548DCAR supports two independent 4-channel ASRC banks, enabling concurrent processing of two distinct input sampling rates (e.g., 44.1 kHz from CD audio and 48 kHz from HDMI ARC). Each bank handles four channels with worst-case passband ripple ±0.05 dB and stopband attenuation of 130 dB, allowing seamless integration of heterogeneous digital audio sources without external resampling hardware.

How does Power-Supply Volume Control (PSVC) work in the TAS5548DCAR?

PSVC in the TAS5548DCAR generates a PWM signal (on PSVC/MCLKO pin) that modulates the supply voltage to downstream Class-D power stages, effectively extending dynamic range at low volume levels. It provides 12, 18, or 24 dB of additional attenuation range beyond standard digital volume control, implemented with 2048-step resolution and single-sided modulation-enabling Class-G operation to reduce power dissipation and thermal load in compact enclosures.

What are the critical power supply requirements for stable TAS5548DCAR operation?

The TAS5548DCAR requires strict separation of analog and digital supplies: AVDD/AVDD_PWM (3.0–3.6 V, 3.3 V nominal) for PLL and PWM sections; DVDD1/DVDD2 (3.0–3.6 V) for digital core; and internally regulated 1.8 V rails (VR_DIG, VR_PWM, VR_ANA) with dedicated low-ESR decoupling (4.7 µF on VR_DIG; 0.1 µF on VR_PWM/VR_ANA). AVSS_PWM must have a direct copper return path to AVDD_PWM to minimize PLL jitter, and DVSS1/DVSS2 must be isolated from analog grounds.

Can the TAS5548DCAR drive both speakers and headphones simultaneously?

Yes, the TAS5548DCAR supports concurrent speaker and headphone output via dedicated signal paths: eight differential PWM outputs (PWM_P_x / PWM_M_x) drive speaker power stages, while two differential headphone outputs (PWM_HPP_L/R and PWM_HPM_L/R) provide high-fidelity analog-capable signals. The HP_SEL pin enables hardware-selectable routing-logic low activates headphone mode (muting speakers), logic high selects speaker mode (muting headphones)-with soft-switching to prevent audible transients.