Texas Instruments TAS3251EVM

Overview

TAS3251EVM from Texas Instruments is an evaluation module for the TAS3251 175-W stereo / 350-W mono ultra-HD digital-input Class-D amplifier with integrated DSP, supporting BTL and PBTL output configurations, USB Audio 2.0/1.0, SPDIF, optical, coaxial, and direct I2S inputs, and featuring dual crystal oscillators at 22.5792 MHz and 24.576 MHz for precise audio clocking.

For engineers reviewing the TAS3251EVM datasheet, TAS3251EVM pinout, TAS3251EVM application, or TAS3251EVM equivalent, this board enables rapid validation of high-fidelity Class-D amplifier performance, real-time DSP tuning via PurePath™ Console 3 (PPC3), and system-level integration testing across USB, SPDIF, and I2S digital audio interfaces under variable PVDD (15–36 V) and load (2–8 Ω) conditions.

Technical Context

The TAS3251EVM implements a complete reference design for the TAS3251 IC, integrating XMOS-based USB audio interface (UAC 2.0 capable up to 192 kHz/8ch), SRC4392 sample-rate converter for SPDIF/optical/coax inputs, and configurable LC output filter (7 µH / 0.68 µF) optimized for THD+N < 0.01% at 1 kHz in BTL mode with 4-Ω load.

Hardware configuration is managed via 20+ jumpers and DIP switches-including J2 (MCLK frequency select), J14 (master/slave mode), J16 (USB high-speed enable), J19 (I2C address), J22 (PWM switching frequency), and J31/J32 (PBTL channel grounding)-enabling deterministic control over power topology, clock domain routing, fault reporting (CLIP_OTW/FAULT LEDs), and inter-board synchronization.

Key Specifications

Availability

TAS3251EVM is available at Aetrix Electronics and suitable for audio system validation, Class-D amplifier reference design verification, and DSP-based loudspeaker tuning applications requiring stable component supply and full technical documentation support.

Supply support for TAS3251EVM 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 company specializing in analog, embedded processing, and digital signal processing technologies, with leadership in high-performance audio, power management, and industrial interface solutions.

The TAS3251EVM belongs to TI's PurePath™ audio evaluation platform family, designed specifically to accelerate development of ultra-low-distortion, high-power Class-D amplifier systems with integrated DSP, real-time tuning, and multi-standard digital audio interface interoperability.

FAQ

What is the primary function of the TAS3251EVM?

The TAS3251EVM is a fully assembled evaluation module for the TAS3251 digital-input Class-D amplifier IC. It provides hardware and software infrastructure-including XMOS USB interface, SRC4392 sample-rate converter, dual crystal oscillators, configurable LC output filter, and PurePath™ Console 3 (PPC3) integration-to validate amplifier performance, tune DSP algorithms, and verify system-level audio signal chain behavior in both BTL and PBTL modes.

Which audio clock frequencies does the TAS3251EVM support natively?

The TAS3251EVM supports two native master clock frequencies: 22.5792 MHz (for 44.1-kHz-based sample rates like 44.1 kHz, 88.2 kHz, 176.4 kHz) and 24.576 MHz (for 48-kHz-based rates like 48 kHz, 96 kHz, 192 kHz), selected via jumper J2. These clocks feed the SRC4392 and TAS3251 directly, enabling jitter-sensitive high-resolution audio playback without external clock synthesis.

How does the TAS3251EVM handle USB audio enumeration?

The TAS3251EVM enumerates as a USB Audio Class 2.0 device when jumper J16 (HS-EN) is installed and the TI UAC2 driver is loaded on the host PC-supporting up to 192 kHz/8ch I2S audio and bidirectional I2C control. With J16 removed, it defaults to USB Audio Class 1.0 mode, limiting bandwidth to 96 kHz/2ch but ensuring broad OS compatibility without custom drivers.

Can the TAS3251EVM operate in master-slave configurations?

Yes-the TAS3251EVM supports synchronized dual-board operation using J35 (SLAVE ENABLE) and J19 (I2C address). One board acts as master (I2C address 0x94, J14 removed), the other as slave (I2C address 0x96, J14 installed); they connect via J9 interboard cable to share I2S audio and I2C commands, enabling stereo 1.1 active crossover or multi-channel amplification without external timing sources.

What are the key indicators and fault reporting mechanisms on the TAS3251EVM?

The TAS3251EVM uses dedicated LEDs for status monitoring: D10 (FAULT) and D11 (CLIP_OTW) indicate amplifier faults (overtemperature, overload, undervoltage) or clipping/pre-clipping events; D1 (USB Ready) confirms USB enumeration; D2 (SPDIF LOCK) shows SRC4392 lock status; D13/D14 confirm 12V/3.3V rail presence. Fault states follow defined LED logic per Table 3 in SLAU757B.