Texas Instruments DIX4192IPFBRQ1

Overview

DIX4192IPFBRQ1 from Texas Instruments is an AEC-Q100 Grade 3 (–40°C to +85°C) automotive-qualified integrated digital audio interface receiver and transmitter (DIR/DIT) in TQFP-48 package. It supports S/PDIF/AES3/IEC 60958 standards, operates at sampling rates up to 216 kHz, features four differential line receivers and one differential line driver, and delivers low-jitter recovered clock output (250 ps RMS cycle-to-cycle jitter). It is used in automotive head unit infotainment systems for bidirectional digital audio routing between tuner, amplifier, and Jacinto DSP.

For engineers reviewing the DIX4192IPFBRQ1 datasheet, DIX4192IPFBRQ1 pinout, DIX4192IPFBRQ1 application, or DIX4192IPFBRQ1 equivalent, key selection considerations include DIR PLL lock range (20–216 kHz), dual I²C/SPI host interface support, 24-bit audio word length capability, differential input sensitivity (150–200 mV), and dual audio serial ports with master/slave mode flexibility.

Technical Context

The DIX4192IPFBRQ1 integrates a digital audio interface receiver (DIR) with four differential inputs 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. Its DIR core recovers a low-jitter master clock (RXCKO) with intrinsic jitter ≤250 ps RMS, while the DIT provides both differential (TX+/TX–) and CMOS-buffered (AESOUT) outputs.

Two synchronous audio serial ports (A and B) operate up to 216 kHz in left/right-justified or I²S format with 24-bit word length support. Host configuration uses user-selectable SPI (≤40 MHz) or I²C (standard/fast mode), with status registers, interrupt flag (INT), and four programmable general-purpose outputs (GPO1–GPO4) for functional signaling.

Key Specifications

Pinout & Package

TQFP-48 package (7.00 mm × 7.00 mm), lead-free, automotive-qualified. Pin count: 48. Thermal resistance: R_θJA = 62.0°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with PCM9211 and DIX9211, the DIX4192IPFBRQ1 uniquely combines DIR, DIT, dual audio serial ports, and four GPOs in one TQFP-48 package - making it the only option for automotive head units requiring simultaneous multi-source reception, format conversion, and synchronized multi-path transmission without external logic.

Availability

DIX4192IPFBRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, trunk-mounted amplifier interfaces, and Jacinto DSP-based audio processing platforms requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.

Supply support for DIX4192IPFBRQ1 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 automotive-grade ICs, with decades of experience in high-reliability signal chain solutions.

The DIX4192IPFBRQ1 belongs to TI's automotive digital audio interface product line, designed specifically for AEC-Q100-compliant infotainment systems requiring robust S/PDIF/AES3 interoperability, low-jitter clock recovery, and flexible multi-source routing in space-constrained head units.

FAQ

What is the operating temperature range for the DIX4192IPFBRQ1?

The DIX4192IPFBRQ1 is qualified to AEC-Q100 Grade 3 with an ambient operating temperature range of –40°C to +85°C. This specification is confirmed in the device's Recommended Operating Conditions table and applies to the DIX4192I-Q1 variant, which matches the DIX4192IPFBRQ1 ordering suffix. The part is intended for passenger compartment automotive applications where thermal stress is moderate but reliability is critical.

Does the DIX4192IPFBRQ1 support both I²C and SPI host interfaces simultaneously?

No, the DIX4192IPFBRQ1 supports either I²C or SPI - not both simultaneously. The CPM pin (pin 18) selects the mode: logic low configures SPI (with CS/A0 as chip select), logic high configures I²C (with CS/A0 and CDIN/A1 as slave address pins). This hardware-selectable interface ensures deterministic configuration at power-up and eliminates bus contention risks in automotive systems.

Can the DIX4192IPFBRQ1 recover clock from non-PCM S/PDIF streams like DTS or Dolby Digital?

Yes, the DIX4192IPFBRQ1 automatically detects and locks to non-PCM streams including DTS CD/LD and IEC 61937-compliant formats. Its DIR PLL maintains lock across the full 20–216 kHz range regardless of payload type, and the recovered clock (RXCKO) remains stable and low-jitter (≤250 ps RMS) - enabling downstream clocking of DSPs or DACs even during encoded bitstream playback.

What is the function of the bypass multiplexer in the DIX4192IPFBRQ1?

The bypass multiplexer in the DIX4192IPFBRQ1 routes raw outputs from the four differential line receivers directly to the DIT's line driver (TX+/TX–) and CMOS buffer (AESOUT), bypassing the DIR decoding core entirely. This enables transparent pass-through of AES3-encoded streams - useful for legacy amplifier interfaces or scenarios where format conversion is unnecessary, reducing latency and preserving original encoding integrity.

How many power supply rails does the DIX4192IPFBRQ1 require, and what are their roles?

The DIX4192IPFBRQ1 requires four independent supplies: VDD18 (1.8 V, digital core), VDD33 (3.3 V, DIR line receiver bias and DIT line driver), VCC (3.3 V, DIR comparator and PLL), and VIO (1.65–3.6 V, logic I/O). This separation minimizes noise coupling between analog recovery circuitry and digital logic, ensures clean clock generation, and allows compatibility with diverse host processor I/O voltages - all verified in the device's Electrical Characteristics tables.