Texas Instruments TPA5051RSAR

Overview

TPA5051RSAR from Texas Instruments is a four-channel digital audio lip-sync delay IC with I²C control, supporting dual serial audio inputs (I²S/right-justified/left-justified), 16–24-bit resolution, and per-channel delay up to 85 ms at 48 kHz sampling rate. It operates from 3.3 V with 5 V–tolerant I/O and eliminates erroneous output data on power-up or delay changes.

For engineers reviewing the TPA5051RSAR datasheet, TPA5051RSAR pinout, TPA5051RSAR application, or TPA5051RSAR equivalent, this device addresses precise audio-video synchronization in flat-panel TVs, home theater rear-channel effects, wireless speaker front-channel alignment, and ATSC processor interfacing - requiring sample-accurate delay control, independent input clocking, and I²C-configurable format selection.

Technical Context

The TPA5051RSAR implements two independent serial audio input paths, each with dedicated BCLK/LRCLK/DATA interfaces and separate delay memory blocks. Delay is configured via I²C registers (0x02–0x05 for Channel 1; 0x0A–0x0D for Channel 2), supporting either sample-based (up to 4095 samples) or frame-based delay calculation using programmable frame rate (50/59.94 Hz) and audio sample rate (32–192 kHz).

Internal clock generation derives entirely from incoming audio clocks - no external crystal or oscillator required. The I²C interface (400 kHz max, 5 V tolerant) uses three address pins (ADD0–ADD2) to select one of eight slave addresses (0xD0–0xDE), enabling daisy-chained configurations of up to eight devices for extended delay.

Key Specifications

Pinout & Package

TPA5051RSAR is housed in a surface-mount 4 mm × 4 mm, 16-pin QFN (RSA) package with an exposed thermal pad that must be soldered to a PCB thermal land for thermal management and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TAS5504A and CS8422-CZZ, the TPA5051RSAR delivers dedicated, low-latency lip-sync delay with minimal external components, independent dual-input support, and frame-aware synchronization - making it optimal for cost-sensitive, space-constrained A/V sync applications where simplicity and determinism are critical.

Availability

TPA5051RSAR is available at Aetrix Electronics and suitable for flat-panel TV manufacturing, home theater OEM integration, wireless speaker development, and ATSC broadcast equipment requiring stable component supply and long-term production continuity.

Supply support for TPA5051RSAR 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 connectivity technologies, with decades of expertise in high-fidelity audio signal chain solutions.

The TPA5051RSAR belongs to TI's digital audio interface and synchronization product line, designed specifically to solve lip-sync challenges in modern video display systems - emphasizing precision delay, format flexibility, and seamless integration with audio processors and amplifiers.

FAQ

What is the maximum audio delay achievable with the TPA5051RSAR?

The TPA5051RSAR supports up to 4095 audio samples of delay per channel. At a 48 kHz sampling rate, this equals 85.3 ms (4095 ÷ 48000). Delay time scales inversely with fs - e.g., 42.7 ms at 96 kHz. Frame-based delay mode also supports up to 8 frames at 50 Hz (160 ms theoretical), but is capped at 4095 samples internally. The TPA5051RSAR enforces this limit to ensure buffer integrity and deterministic operation.

Does the TPA5051RSAR require an external crystal or oscillator?

No, the TPA5051RSAR does not require any external crystal or oscillator. All internal clocks - including those for delay memory, I²C interface, and data path timing - are generated directly from the incoming BCLK and LRCLK signals. This eliminates timing component count, reduces board area, and avoids crystal aging or temperature drift concerns. The TPA5051RSAR remains fully functional as long as valid audio clocks are present on BCLK1/BCLK2 and LRCLK1/LRCLK2.

Can the TPA5051RSAR handle different audio formats on its two input channels simultaneously?

Yes, the TPA5051RSAR supports independent format selection per channel via separate I²C control registers (0x01 for Channel 1, 0x09 for Channel 2). One channel can be configured for I²S while the other uses right-justified format - with distinct packet length, delay, and mute settings. This capability enables flexible integration with heterogeneous audio sources, such as an HDMI receiver (I²S) and a Bluetooth baseband processor (right-justified), both feeding into a single TPA5051RSAR.

How does the Complete Update register prevent audio artifacts during reconfiguration?

The Complete Update register (0x08 for Channel 1, 0x10 for Channel 2) acts as an atomic commit flag. When a '1' is written to its LSB, the TPA5051RSAR simultaneously transfers all pending delay, format, and packet-length settings from shadow registers into the active delay logic - avoiding partial updates that cause clicks or dropouts. Without this mechanism, writing delay upper/lower bytes separately would result in transient misalignment. The TPA5051RSAR ensures glitch-free operation during live A/V sync adjustments.

Is the TPA5051RSAR pin-compatible with other TI audio delay ICs like the TPA5050?

No, the TPA5051RSAR is not pin-compatible with the TPA5050 or any other TI audio delay device. Its 16-pin QFN (RSA) footprint, pin assignments (e.g., dual BCLK/LRCLK inputs, ADD0–ADD2 address pins), and internal architecture are unique to the TPA5051 family. Substituting with another part would require PCB redesign, firmware adaptation, and validation of timing behavior. The TPA5051RSAR must be used with its designated layout and decoupling (0.1 µF VDD–GND capacitor, thermal pad grounded).