Texas Instruments DIX4192TPFBRQ1

Overview

DIX4192TPFBRQ1 from Texas Instruments is an automotive-qualified integrated digital audio interface receiver and transmitter (DIR/DIT) with dual audio serial ports (A/B), four differential S/PDIF inputs, one differential S/PDIF output, and 24-bit audio support up to 216 kHz sampling rate. It operates from 1.8-V core and 3.3-V I/O supplies and is used in head unit and trunk amplifier interconnects within automotive infotainment systems.

For engineers reviewing the DIX4192TPFBRQ1 datasheet, DIX4192TPFBRQ1 pinout, DIX4192TPFBRQ1 application, or DIX4192TPFBRQ1 equivalent, key selection criteria include DIR PLL lock range (20–216 kHz), recovered clock jitter (250 ps RMS), dual SPI/I²C host interface, TQFP-48 package compatibility with SRC4382/SRC4392, and AEC-Q100 Grade 2 or 3 qualification.

Technical Context

The DIX4192TPFBRQ1 integrates a digital audio interface receiver (DIR) with four differential line receivers and automatic detection of non-PCM streams (DTS CD/LD, IEC 61937), plus a digital audio interface transmitter (DIT) supporting PCM-to-S/PDIF conversion at up to 216 kHz. Its DIR PLL lock range spans 20 kHz to 216 kHz, and it delivers low-jitter recovered clock output (RXCKO) with 250 ps RMS cycle-to-cycle jitter.

Two synchronous audio serial ports (A and B) operate in slave or master mode, support left/right-justified and I²S formats, and handle word lengths up to 24 bits. The device uses a user-selectable SPI (up to 40 MHz) or I²C (standard/fast mode) host interface for register access, status monitoring, and block-sized channel/user data buffer management.

Key Specifications

Pinout & Package

The DIX4192TPFBRQ1 is housed in a lead-free TQFP-48 package (7.00 mm × 7.00 mm), compatible with SRC4382 and SRC4392 footprints. It features separate ground domains (DGND1, DGND2, DGND3, AGND, BGND) and dedicated power rails for core, analog, I/O, and PLL circuitry to minimize cross-coupling.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digital audio interface receiver/transmitter applications.

Compared with SRC4382IDBTRQ1 and PCM9211PWR, the DIX4192TPFBRQ1 uniquely combines DIR, DIT, dual audio serial ports, and programmable GPOs in a single AEC-Q100 qualified device - reducing component count, layout complexity, and timing alignment effort in automotive head unit designs.

Availability

DIX4192TPFBRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, head unit digital audio hubs, and trunk amplifier interconnects requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.

Supply support for DIX4192TPFBRQ1 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 technologies for automotive, industrial, and communications markets.

The DIX4192TPFBRQ1 belongs to TI's automotive-qualified digital audio interface product line, designed specifically for noise-immune, high-fidelity digital audio transport and format translation in vehicle infotainment ECUs and amplifier modules.

FAQ

What is the primary function of the DIX4192TPFBRQ1 in an automotive audio system?

The DIX4192TPFBRQ1 serves as a dual-role digital audio interface IC that simultaneously receives and transmits S/PDIF streams while bridging to PCM-based processors. In automotive systems, it acts as the central audio router - accepting S/PDIF from tuners or Bluetooth modules via its four differential receivers, recovering low-jitter clocks, converting to PCM for Jacinto DSP processing, and transmitting processed audio via DIT to trunk amplifiers. Its integrated DIR/DIT, dual audio serial ports, and GPOs eliminate discrete interface components in head unit designs.

Does the DIX4192TPFBRQ1 support both SPI and I²C host interfaces, and how are they selected?

Yes, the DIX4192TPFBRQ1 supports both SPI and I²C host interfaces, selected by the logic level on the CPM pin (pin 18): low enables SPI mode (using CS/A0, CCLK/SCL, CDIN/A1, CDOUT/SDA), and high enables I²C mode (using A0/A1 for slave address, SCL/SDA for bus signaling). Both interfaces provide full access to control/status registers and channel/user data buffers. SPI supports up to 40 MHz operation; I²C supports standard (100 kbps) and fast (400 kbps) modes. The DIX4192TPFBRQ1 does not auto-detect interface type - configuration is hardware-defined at power-up.

What is the significance of the RXCKO pin on the DIX4192TPFBRQ1, and what jitter performance does it deliver?

The RXCKO pin on the DIX4192TPFBRQ1 outputs the master clock recovered by the DIR from incoming S/PDIF streams. This clock is critical for synchronizing downstream audio components like DACs, ADCs, or DSPs without requiring external PLLs or jitter cleaners. Measured at 250 ps RMS cycle-to-cycle jitter under typical conditions, RXCKO meets stringent timing requirements for high-resolution audio (up to 216 kHz). Its tri-state capability allows sharing with other devices on a common clock bus, and its frequency tracks the input stream's sampling rate across the full 20–216 kHz DIR lock range.

How does the DIX4192TPFBRQ1 handle non-PCM audio formats such as DTS or Dolby Digital?

The DIX4192TPFBRQ1 automatically detects and passes through non-PCM audio formats including DTS CD/LD and IEC 61937-compliant streams without decoding or modification. Its DIR core identifies these encoded frames via preamble and packet structure analysis, then routes them intact through the bypass multiplexer to the DIT output - preserving encryption, metadata, and bitstream integrity. This enables direct transmission to external decoders (e.g., in trunk amplifiers) while still allowing PCM processing paths for standard stereo content. Format detection requires no host configuration and occurs transparently during normal operation.

Is the DIX4192TPFBRQ1 pin-compatible with any other Texas Instruments audio interface devices?

Yes, the DIX4192TPFBRQ1 is pin-compatible with the SRC4382 and SRC4392 in its TQFP-48 package footprint, enabling drop-in replacement in existing layouts where functional overlap exists. However, unlike those devices, the DIX4192TPFBRQ1 integrates both DIR and DIT functions plus dual audio serial ports - meaning pin compatibility does not imply functional equivalence. Designers migrating from SRC4382 must verify that unused pins (e.g., dedicated ADC inputs on SRC4382) are properly terminated or repurposed, and that firmware accounts for expanded register maps and feature sets in the DIX4192TPFBRQ1.