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Home > Products > Integrated Circuits (ICs) > Audio Special Purpose

Texas Instruments DIX9211PTR

Name: DIX9211PTR
Brand: Texas Instruments
SKU: DIX9211PTR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: DIX9211PTR

Manufacturer:: Texas Instruments

Category:: Audio Special Purpose

Package:: 48-LQFP

Datasheet:: DIX9211PTR.pdf

Description:: IC AUDIO TRANSCEIVER 48LQFP

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Product details

Overview

DIX9211PTR from Texas Instruments is a 216-kHz digital audio interface transceiver (DIX) integrating S/PDIF receiver (DIR), transmitter (DIT), and multi-source PCM routing logic in a single LQFP-48 package. It supports 12 S/PDIF inputs (2 coaxial + 10 optical), 3x PCM inputs, and delivers 24-bit audio at sampling rates up to 216 kHz with 50-ps ultralow jitter on recovered clocks - deployed in high-end home theater AV receivers for seamless source switching between optical, coaxial, and I2S streams.

For engineers reviewing the DIX9211PTR datasheet, DIX9211PTR pinout, DIX9211PTR application, or DIX9211PTR equivalent, key selection considerations include asynchronous DIR/DIT operation, 48-bit channel status buffering, integrated PLL-based clock recovery with auto-sampling-rate detection, and hardware/software-configurable multipurpose I/O for flexible signal routing in multichannel audio systems.

Technical Context

The DIX9211PTR implements dual-domain asynchronous operation: DIR and DIT each maintain independent PLLs synchronized to their respective input/output sampling frequencies (7–216 kHz), enabling real-time switching between sources without clock domain conflict. Its routing engine accepts three PCM inputs and twelve S/PDIF inputs, directing any combination to Main Out, Aux Out, or DIT output via register-controlled multiplexers.

It integrates a 24.576-MHz crystal oscillator circuit (XTI/XTO), supports I²C/SPI control up to 400 kHz, and provides two interrupt pins (ERROR/INT0, NPCM/INT1) tied to DIR error detection and non-PCM identification (e.g., DTS-CD/LD). Power management includes pin- and register-level power-down for DIR, DIT, coaxial amplifiers, and oscillator - preserving register state during partial shutdown.

Key Specifications

Parameter	Value and Actual Design Meaning
Max Sampling Rate	216 kHz - enables high-resolution audio playback including DSD over PCM and studio-grade 192/216-kHz mastering workflows.
DIR Input Count	12 total: 2 coaxial (RXIN0/RXIN1 with internal 20-kΩ amplifiers) + 10 optical (RXIN2–RXIN7 + MPIO_A0–A3 reconfigurable as RXIN8–RXIN11).
Channel Status Buffer	48-bit - captures full IEC60958 channel status word per frame for format identification, copy protection, and metadata parsing.
Recovered Clock Jitter	50 ps RMS - meets IEC60958-3 jitter tolerance requirements across 28–216 kHz, ensuring bit-perfect S/PDIF reception in noise-sensitive environments.
System Clock Options	128fS / 256fS / 512fS (0.896–55.296 MHz) - selectable via registers to match DSP interface requirements without external clock synthesis.
Supply Voltages	VCC/VDD/VDDRX = 2.9–3.6 V - triple-rail design isolates analog PLL (VCC/AGND), digital core (VDD/DGND), and coaxial receivers (VDDRX/GNDRX) for optimal SNR.
Operating Temperature	–40°C to +85°C - qualified for industrial-grade deployment in AV receivers, soundbars, and broadcast equipment with extended thermal margins.

Pinout & Package

Package: 48-pin LQFP (PT), 7.0 mm × 7.0 mm, 0.5-mm pitch, exposed pad not specified. Thermal resistance θ_JA = 61.0°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 ERROR/INT0	DIR error flag / interrupt 0 output	Active-low open-drain signal indicating loss of PLL lock, invalid preamble, or CRC failure - configurable via Register 20h.
2 NPCM/INT1	Non-PCM detection / interrupt 1 output	Asserted when DIR identifies DTS-CD/LD, AC-3, or IEC61937-compressed data - controlled by Register 2Bh.
15–16 MPO0/MPO1	Multipurpose outputs	Routable RECOUT signals (S/PDIF or PCM) - selectable via registers to drive auxiliary DACs or monitoring paths.
17–20 DOUT/LRCK/BCK/SCKO	Main PCM output port	24-bit serial audio data, left/right clock, bit clock, and system clock - fully programmable format (I²S/LJ/RJ) and sample rate division.
23–26 MDO/ADR0, MDI/SDA, MC/SCL, MS/ADR1	I²C/SPI control interface	Supports both protocols: I²C (open-drain SDA/SCL) and SPI (4-wire with chip select); MODE pin selects interface at power-up.
35/37 RXIN1/RXIN0	Coaxial S/PDIF inputs	Integrated 20-kΩ input impedance amplifiers - powered only when RX0DIS/RX1DIS = 0 in Register 34h; otherwise internally pulled high.
39/40 XTI/XTO	Crystal oscillator terminals	CMOS Schmitt-trigger input (XTI) and buffered output (XTO) for 24.576-MHz fundamental-mode crystal - requires external loop filter on FILT (pin 43).

Key Features

Feature	Design Value
Asynchronous DIR/DIT operation	Enables simultaneous 192-kHz analog capture and 48-kHz S/PDIF playback without shared clock constraints or FIFO buffering.
12-input S/PDIF multiplexer	Reduces external mux IC count by supporting optical/coaxial source aggregation directly into DSP pipeline - eliminates board-level signal fanout.
48-bit channel status register access	Allows host processor to read full IEC60958 channel status (format, emphasis, category, source number) without parsing raw biphase stream.
Auto-detecting sample rate calculator	Derives f_S from both biphase edge timing and channel status bits - eliminates need for external frequency counters in adaptive audio systems.
Configurable MPIO groups (A/B/C)	12 pins partitioned into three 4-pin banks - each bank can be assigned as S/PDIF inputs, AUX I²S lanes, or GPIO, maximizing pin reuse per application.

Applications

Home Theater AV Receiver	Professional Soundbar
Use Scenario: Aggregating 8 HDMI ARC sources, 2 optical Blu-ray players, and 1 coaxial CD transport into a single DSP for Dolby Atmos decoding. IC Role / Device Role / Timing Role: Digital front-end transceiver performing S/PDIF demux, clock recovery, and format conversion prior to DSP ingestion. Use Value: Eliminates discrete S/PDIF receivers and clock cleaners; 50-ps jitter ensures low-noise master clock for high-SNR DACs.	Use Scenario: Supporting simultaneous 5.1 optical input, 2.0 coaxial input, and 2-channel I²S from internal streaming SoC in compact soundbar PCB. IC Role / Device Role / Timing Role: Central routing hub managing time-aligned audio streams from heterogeneous sources to dual DACs. Use Value: Reduces BOM by 3+ ICs; programmable MPIOs enable layout reuse across product variants without redesign.
Studio Audio Interface	Broadcast Audio Recorder
Use Scenario: Capturing 24-bit/192-kHz PCM from DAW via I²S while monitoring S/PDIF return feed from analog console in real time. IC Role / Device Role / Timing Role: Dual-domain audio bridge with independent DIR/DIT PLLs maintaining sample-accurate synchronization across domains. Use Value: Asynchronous operation prevents clock slip during sample rate transitions; 48-bit CS buffer enables metadata logging.	Use Scenario: Recording multi-source live feeds (satellite decoder, OB van link, studio mic preamp) with embedded timecode and format tagging. IC Role / Device Role / Timing Role: Format-aware receiver identifying IEC61937 bursts and extracting user/channel status bits for metadata injection. Use Value: NPCM/INT1 pin triggers metadata capture on compressed frame boundaries - no software parsing overhead required.

Home Theater AV Receiver

Professional Soundbar

Use Scenario: Aggregating 8 HDMI ARC sources, 2 optical Blu-ray players, and 1 coaxial CD transport into a single DSP for Dolby Atmos decoding.

IC Role / Device Role / Timing Role: Digital front-end transceiver performing S/PDIF demux, clock recovery, and format conversion prior to DSP ingestion.

Use Value: Eliminates discrete S/PDIF receivers and clock cleaners; 50-ps jitter ensures low-noise master clock for high-SNR DACs.

Use Scenario: Supporting simultaneous 5.1 optical input, 2.0 coaxial input, and 2-channel I²S from internal streaming SoC in compact soundbar PCB.

IC Role / Device Role / Timing Role: Central routing hub managing time-aligned audio streams from heterogeneous sources to dual DACs.

Use Value: Reduces BOM by 3+ ICs; programmable MPIOs enable layout reuse across product variants without redesign.

Studio Audio Interface

Broadcast Audio Recorder

Use Scenario: Capturing 24-bit/192-kHz PCM from DAW via I²S while monitoring S/PDIF return feed from analog console in real time.

IC Role / Device Role / Timing Role: Dual-domain audio bridge with independent DIR/DIT PLLs maintaining sample-accurate synchronization across domains.

Use Value: Asynchronous operation prevents clock slip during sample rate transitions; 48-bit CS buffer enables metadata logging.

Use Scenario: Recording multi-source live feeds (satellite decoder, OB van link, studio mic preamp) with embedded timecode and format tagging.

IC Role / Device Role / Timing Role: Format-aware receiver identifying IEC61937 bursts and extracting user/channel status bits for metadata injection.

Use Value: NPCM/INT1 pin triggers metadata capture on compressed frame boundaries - no software parsing overhead required.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
AK4118VN	10-input S/PDIF receiver only (no DIT or routing); supports 192 kHz but lacks 48-bit channel status buffer and MPIO flexibility.	Targeted at fixed-function receiver-only designs; cannot replace DIX9211PTR's transmitter or multiplexing capability.	Select AK4118VN only if system uses separate DIT IC and does not require dynamic source routing or non-PCM detection.
CIRRUS CS8416-CQZ	6-input S/PDIF receiver with I²C control; supports 216 kHz but no integrated DIT, no coaxial amps, and no auxiliary PCM I/O.	Suitable for cost-sensitive consumer audio where optical-only inputs and minimal routing suffice.	Choose CS8416-CQZ when board space allows separate DIT and routing logic, and coaxial input support is unnecessary.

Compared with AK4118VN and CS8416-CQZ, the DIX9211PTR uniquely integrates full transceiver functionality, 12-input multiplexing, and programmable I/O in one device - reducing component count and enabling adaptive audio architectures without sacrificing professional-grade jitter performance or metadata fidelity.

Availability

DIX9211PTR is available at Aetrix Electronics and suitable for home theater AV receivers, professional soundbars, and broadcast audio recorders requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.

Supply support for DIX9211PTR 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 with decades of audio interface IP heritage.

The DIX9211PTR belongs to TI's high-fidelity digital audio transceiver product line, engineered for multichannel consumer and pro-audio systems demanding robust S/PDIF handling, low-jitter clock recovery, and flexible signal routing without external glue logic.

FAQ

What is the maximum supported sampling frequency for the DIX9211PTR DIR and DIT modules?

The DIX9211PTR supports up to 216 kHz for both its digital audio interface receiver (DIR) and transmitter (DIT) modules. This capability is confirmed in the datasheet's "RECOMMENDED OPERATING CONDITIONS" and "ELECTRICAL CHARACTERISTICS" sections, where DIR and DIT sampling frequency is specified as 7–216 kHz. The DIX9211PTR achieves this using adaptive PLLs and selectable system clock dividers (128fS/256fS/512fS), making it suitable for high-resolution audio applications including studio mastering and Dolby TrueHD transport.

Does the DIX9211PTR support both coaxial and optical S/PDIF inputs simultaneously?

Yes, the DIX9211PTR supports simultaneous coaxial and optical S/PDIF inputs: two dedicated coaxial inputs (RXIN0 and RXIN1) with integrated 20-kΩ amplifiers, plus ten additional S/PDIF inputs configurable via RXIN2–RXIN7 and MPIO_A0–A3 (as RXIN8–RXIN11). All 12 inputs operate independently and can be routed through the internal multiplexer to the DIR engine or auxiliary outputs. The DIX9211PTR datasheet explicitly states "12x S/PDIF Input Ports: 2x Coaxial S/PDIF Inputs, 10x Optical S/PDIF Inputs" in the Applications section.

How does the DIX9211PTR handle non-PCM audio formats like DTS or AC-3?

The DIX9211PTR detects non-PCM audio (e.g., DTS-CD/LD, AC-3) via its DIR module using three methods: analysis of channel status bits, burst preamble patterns, and dedicated DTS-CD/LD detection logic. When identified, it asserts the NPCM/INT1 pin (pin 2) - configurable via Register 2Bh - allowing the host processor to trigger appropriate decoding or passthrough behavior. Preamble data (PC/PD) is stored in Registers 3Ah–3Dh per IEC61937, enabling full metadata extraction without bitstream parsing. This functionality is documented in the Overview and DIR sections of the SBAS519 datasheet.

Can the DIX9211PTR operate without an external crystal?

No, the DIX9211PTR requires an external 24.576-MHz crystal connected between XTI (pin 39) and XTO (pin 40) to generate its master clock for PLL operation. While the oscillator circuit supports external clock injection at XTI, the datasheet specifies "OSCILLATOR CIRCUIT, XTI and XMCKO CLOCK" with XTI source clock frequency = 24.576 MHz and mandates connection of a crystal plus external loop filter to FILT (pin 43). Omitting the crystal disables DIR/DIT clock recovery, rendering the DIX9211PTR nonfunctional for S/PDIF interfaces.

What power supply configuration is required for the coaxial amplifier inputs on the DIX9211PTR?

The coaxial amplifier inputs (RXIN0 and RXIN1) on the DIX9211PTR require dedicated 2.9–3.6 V supply on VDDRX (pin 36) referenced to GNDRX (pin 38). This rail powers only the coaxial input stages; if optical-only operation is used, VDDRX may be left unconnected. The amplifiers are enabled/disabled via Register 34h (RX0DIS/RX1DIS bits), and when disabled, RXIN0/RXIN1 are internally pulled high. This isolated supply prevents noise coupling from digital rails - a requirement explicitly stated in the "Power Supply" section of the SBAS519 datasheet.

DIX9211PTR Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Series:: -

Package/Case:: 48-LQFP

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Audio Transceiver

Applications:: Consumer Audio, Musical Instruments

Number of Channels:: 2

Interface:: I2C, I2S, SPI

Voltage - Supply:: 2.9V ~ 3.6V

Operating Temperature:: -40°C ~ 85°C (TA)

Specifications:: 7kHz ~ 216kHz

Mounting Type:: Surface Mount

Grade:: -

DIX9211PTR FAQ

1.How can I place an order for DIX9211PTR through Aetrix?

Please submit a Request for Quotation (RFQ) for DIX9211PTR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for DIX9211PTR reliable?

The price and inventory of DIX9211PTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DIX9211PTR is usually 5 days.

3.What payment methods are accepted for DIX9211PTR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DIX9211PTR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for DIX9211PTR?

DIX9211PTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your DIX9211PTR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for DIX9211PTR?

For technical support, including DIX9211PTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DIX9211PTR requirements.

6.How does Aetrix verify that DIX9211PTR is sourced from the original manufacturer or authorized distributors?

All DIX9211PTR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that DIX9211PTR meets industry standards.

7.What is the process for return or replacement of DIX9211PTR?

All DIX9211PTR units undergo pre-shipment inspection (PSI). If there is an issue with DIX9211PTR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The DIX9211PTR part is unused and in its original packaging.

Return procedure for DIX9211PTR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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