Texas Instruments TPA5051RSAT

Overview

TPA5051RSAT 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), independent channel delay up to 85 ms per channel at 48 kHz, and 3.3 V operation with 5 V tolerant I/O. It synchronizes audio to video in flat-panel TVs and home theater systems.

For engineers reviewing the TPA5051RSAT datasheet, TPA5051RSAT pinout, TPA5051RSAT application, or TPA5051RSAT equivalent, this device delivers sample-accurate digital delay for HDMI/ATSC processor interfaces, supports frame-based delay configuration via I²C, and enables series cascading for extended latency-critical for AV synchronization validation and embedded audio subsystem design.

Technical Context

The TPA5051RSAT implements two independent 3-wire synchronous serial audio ports (BCLK/LRCLK/DATA), each feeding a configurable delay memory block with 4095-sample maximum depth (13-bit resolution). Delay values are written via I²C to dedicated upper/lower register pairs per channel (0x02–0x05 for Channel 1; 0x0A–0x0D for Channel 2).

It features dual-mode delay control: sample-based (via left/right delay registers) or frame-based (via Frame Delay register 0x06/0x0E, using programmable frame rate and audio sample rate). All internal clocks derive from incoming BCLK-no external crystal required-and I²C address is set by ADD[2:0] pins (8 possible addresses).

Key Specifications

Pinout & Package

TPA5051RSAT uses the RSA (QFN) 4 mm × 4 mm, 16-pin surface-mount package with exposed thermal pad (pin 0, soldered to GND plane). All ground pins (5, 14) must be connected to system GND; thermal pad must be soldered for thermal integrity and electrical 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 TPA5051RSAT offers superior integration of video-frame-aware delay control, dual independent audio paths, and minimal power consumption (3 mA typical), making it uniquely suited for cost-sensitive, space-constrained flat-panel TV and set-top box designs.

Availability

TPA5051RSAT is available at Aetrix Electronics and suitable for flat-panel television manufacturing, home theater AV receiver development, and ATSC set-top box production requiring stable component supply and long-term lifecycle support.

Supply support for TPA5051RSAT 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 solutions, with decades of expertise in high-fidelity audio and precision timing products.

The TPA5051RSAT belongs to TI's digital audio interface and synchronization product line, designed specifically for A/V synchronization in consumer electronics where deterministic, low-latency digital delay is essential.

FAQ

What is the maximum audio delay supported by the TPA5051RSAT?

The TPA5051RSAT supports up to 4095 audio samples of delay per channel. At a 48 kHz sampling rate, this equals 85.3 ms (4095 ÷ 48000). The delay is configurable in 1-sample increments via I²C registers 0x02–0x05 (Channel 1) and 0x0A–0x0D (Channel 2), and must be committed using the Complete Update register (0x08 or 0x10) to avoid audio artifacts.

Does the TPA5051RSAT require an external crystal or oscillator?

No, the TPA5051RSAT does not require an external crystal or oscillator. All internal clocks-including those for delay memory and I²C interface-are generated from the incoming BCLK signals (BCLK1 or BCLK2). This eliminates BOM cost and board space for timing components while maintaining sample-accurate delay fidelity.

Can the TPA5051RSAT handle different sampling rates on its two input ports simultaneously?

Yes, the TPA5051RSAT supports independent sampling rates on Serial Input 1 (LRCLK1) and Serial Input 2 (LRCLK2). Each port has its own BCLK and LRCLK inputs, allowing concurrent operation at different fs values (e.g., 44.1 kHz on DATA1 and 48 kHz on DATA2), with independent delay applied to each stream.

How is I²C address configured on the TPA5051RSAT?

The TPA5051RSAT uses three hardware address pins-ADD0 (pin 10), ADD1 (pin 11), and ADD2 (pin 12)-to configure its 7-bit I²C slave address. These pins set the three LSBs of the fixed 4-bit prefix "1101", yielding eight possible addresses (0xD0 to 0xD6 in 8-bit format, R/W bit included). No software address programming is required.

What happens if the Complete Update register is not written after configuring delay registers?

If the Complete Update register (0x08 for Channel 1 or 0x10 for Channel 2) is not written with '1' after modifying delay or stream-type registers, the new settings remain in the configuration shadow registers and are not transferred to the active delay functional block. Audio continues with prior settings-no mute, pop, or glitch occurs, but the intended delay change will not take effect until the update command is issued.