Texas Instruments SRC4382IPFBR

Overview

SRC4382IPFBR from Texas Instruments is a two-channel asynchronous sample rate converter (SRC) with integrated digital audio interface receiver (DIR) and transmitter (DIT), operating from +1.8V core and +3.3V I/O supplies. It supports input/output sampling rates up to 216kHz, delivers 125dB dynamic range and –125dB THD+N, and features four differential line receivers, dual audio serial ports (A/B), and SPI/I²C host interface - deployed in broadcast studio equipment and digital audio routers.

For engineers reviewing the SRC4382IPFBR datasheet, SRC4382IPFBR pinout, SRC4382IPFBR application, or SRC4382IPFBR equivalent, key selection criteria include its 16:1 to 1:16 continuous conversion ratio, low-jitter recovered clock (250ps RMS), A-weighted dynamic range (128dB typical), AES3/S/PDIF/IEC 60958 compliance, and TQFP-48 package compatibility with SRC4392 and DIX4192.

Technical Context

The SRC4382IPFBR implements a dual-path asynchronous sample rate conversion architecture using polyphase FIR interpolation and decimation filters with programmable pre-buffering (8–64 samples), enabling precise jitter attenuation and group delay control. Its DIR block locks to input sampling rates from 20kHz to 216kHz and recovers a low-jitter master clock (RXCKO) with intrinsic cycle-to-cycle jitter of 250ps RMS.

The DIT block generates differential AES3 output (TX+/TX–) and buffered CMOS AESOUT, supporting up to 216kHz sampling with 200ps RMS intrinsic output jitter. Audio serial ports A and B operate independently in master/slave mode with support for I²S, left-justified, and right-justified formats at bit clock frequencies up to 13.824MHz.

Key Specifications

Pinout & Package

TQFP-48 package (7mm × 7mm, 0.5mm pitch), lead-free, pin- and register-compatible with SRC4392 and DIX4192. Thermal pad exposed on underside (BGND connected to AGND).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar asynchronous sample rate conversion applications.

Compared with SRC4392IPFBR, the SRC4382IPFBR offers identical functionality at slightly relaxed THD+N and word-length limits, making it ideal for cost-sensitive broadcast infrastructure where 24-bit operation suffices. Against AK4128AVQ, SRC4382IPFBR delivers full integration - eliminating two external ICs and simplifying layout - at the expense of higher power and larger footprint.

Availability

SRC4382IPFBR is available at Aetrix Electronics and suitable for broadcast studio equipment, digital audio routers, and DVD/CD recorders requiring stable component supply across extended production lifecycles.

Supply support for SRC4382IPFBR 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 digital signal technologies for industrial, automotive, and audio applications.

The SRC4382IPFBR belongs to TI's professional audio interface product line, engineered specifically for jitter-critical broadcast, studio, and high-end consumer audio systems demanding seamless multi-standard interoperability.

FAQ

What is the maximum supported sampling rate for SRC4382IPFBR input and output?

The SRC4382IPFBR supports input and output sampling rates from 20kHz to 216kHz. This includes standard rates like 44.1kHz and 48kHz, high-resolution rates such as 96kHz and 192kHz, and extended rates up to 216kHz - verified across all operating conditions in the official datasheet. The SRC4382IPFBR achieves this range using adaptive PLL locking and programmable FIR filter coefficients.

Does SRC4382IPFBR support both SPI and I²C host interfaces simultaneously?

No, the SRC4382IPFBR supports either SPI or I²C - selected at power-up via the CPM pin (low = SPI, high = I²C). Both interfaces provide full access to on-chip control registers and data buffers, but they cannot operate concurrently. The SRC4382IPFBR's dual-mode flexibility allows integration with diverse host processors without requiring additional level-shifting or protocol translation.

How does the SRC4382IPFBR handle non-PCM audio streams like DTS or Dolby Digital?

The SRC4382IPFBR automatically detects and passes through non-PCM streams (e.g., DTS CD/LD, IEC 61937-compliant formats) without modification. Its DIR block identifies packet headers and routes them transparently to the DIT or serial ports, preserving bitstream integrity. This capability is confirmed in the datasheet's "Automatic Detection of Non-PCM Audio Streams" feature and enables use in surround sound A/V receivers without external demuxing.

What is the purpose of the LOCK and RDY pins on SRC4382IPFBR?

The LOCK pin (pin 11) is an active-low flag indicating DIR PLL lock status - asserted when the receiver has synchronized to a valid input sampling rate. The RDY pin (pin 15) is also active-low and signals that the SRC has completed initialization and its output buffers contain valid, jitter-attenuated data. Both are essential for system-level handshaking and are documented in the Pin Descriptions section of the SRC4382IPFBR datasheet.

Is SRC4382IPFBR pin-compatible with other Texas Instruments audio converters?

Yes, the SRC4382IPFBR is pin- and register-compatible with the SRC4392 and DIX4192 in the same TQFP-48 package. This allows direct PCB replacement in existing designs - for example, upgrading to SRC4392IPFBR for improved THD+N - without layout changes. Compatibility is explicitly stated in the datasheet's "Features" and "Ordering Information" sections and validated across all 48 pins.