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Texas Instruments PCM2706PJTR
- Part No.:
- PCM2706PJTR
- Manufacturer:
- Texas Instruments
- Category:
- Audio Special Purpose
- Package:
- 32-TQFP
- Datasheet:
-
PCM2706PJTR.pdf
- Description:
- IC AUDIO SIGNAL PROCESSOR 32TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,483
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Product details
Overview
PCM2706PJTR from Texas Instruments is a 16-bit stereo audio DAC with integrated USB 1.1 full-speed interface, S/PDIF output, and single-ended headphone amplifier. It supports 32/44.1/48 kHz sampling rates, operates from 5 V (bus-powered) or 3.3 V (self-powered), and delivers 12 mW into 32 Ω with THD+N of 0.025% - enabling compact USB audio endpoints like desktop speakers and CRT/LCD monitors.
For engineers reviewing the PCM2706PJTR datasheet, PCM2706PJTR pinout, PCM2706PJTR application, or PCM2706PJTR equivalent, key selection criteria include its SpAct™ clock recovery architecture, I2S/S/PDIF dual-output flexibility via FSEL control, bus/self-power configuration, and 32-pin TQFP package with dedicated analog/digital ground separation for low-noise audio playback.
Technical Context
The PCM2706PJTR integrates a USB protocol controller compliant with USB 1.1, eliminating need for custom device drivers. Its SpAct™ architecture recovers audio clock directly from USB isochronous packet timing, feeding an on-chip PLL to generate low-jitter 96 MHz master clock for the 16-bit delta-sigma DAC.
It features dual-mode digital output: S/PDIF (FSEL = HIGH) or I2S (FSEL = LOW), with FUNC0–FUNC3 reconfigurable as HID inputs or I2S signals. Power management includes suspend flag (SSPND), HOST detection, and PSEL-driven bus/self-power mode selection - all implemented without external firmware.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution & Architecture | 16-bit delta-sigma stereo DAC with oversampling digital filter and integrated analog LPF |
| Sampling Rates | 32 kHz, 44.1 kHz, 48 kHz - fixed-rate operation; no asynchronous sample rate conversion |
| Analog Output Drive | Single-ended voltage output: 12 mW into 32 Ω at 0 dBFS; THD+N = 0.025% (bus-powered) |
| Dynamic Performance | SNR and dynamic range = 98 dB (A-weighted, RL > 10 kΩ, self-powered) |
| Digital Interface | USB 1.1 full-speed (12 Mbps); S/PDIF or I2S selectable via FSEL pin; no external driver required |
| Power Supply | Bus-powered: 4.35–5.25 V (VBUS); self-powered: 3.0–3.6 V (VCCP/VCCL/VCCR/VDD) |
| Clock Source | On-chip oscillator with 12 MHz crystal (XTI/XTO); no external clock required |
Pinout & Package
PCM2706PJTR uses a 32-pin TQFP package (PJT suffix) with exposed thermal pad. Pin layout separates analog (AGNDL, AGNDR, PGND, VCOM), digital (DGND, VDD), and USB (D+, D–) domains to minimize noise coupling in audio signal paths.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VOUTL / VOUTR | L/R channel analog outputs | Single-ended headphone drive; AC-coupled, 32 Ω load capable; require external series capacitor |
| D+ / D– | USB differential data pair | Full-speed USB 1.1 interface; D+ requires 1.5-kΩ pull-up; no external transceiver needed |
| FSEL | Function select input | LOW = I2S mode (DOUT = data, FUNC0–FUNC3 = clocks/data); HIGH = S/PDIF mode (DOUT = S/PDIF, FUNC0–FUNC3 = HID keys) |
| PSEL | Power source select | LOW = self-powered (3.3 V supplies); HIGH = bus-powered (5 V from VBUS); configures USB descriptor power class |
| HOST | Host detection / max current select | Self-powered: detect USB attach via pulldown to VBUS; bus-powered: set 100 mA (LOW) or 500 mA (HIGH) draw limit |
| SSPND | Suspend flag output | Active-LOW open-drain signal indicating USB suspend state; used for system power gating |
| XTI / XTO | Crytal oscillator input/output | Supports 12 MHz ±500 ppm crystal; internal oscillator eliminates need for external clock generator |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates external PLL and crystal oscillator IC by deriving audio clock directly from USB packet timing - reduces BOM count and jitter-sensitive layout area |
| Dual Digital Output Mode | Selectable S/PDIF or I2S via single FSEL pin - enables one hardware design to support either digital audio transmission or connection to external codecs |
| Integrated Headphone Amplifier | Single-ended 32 Ω drive with 12 mW output and 0.025% THD+N - supports direct connection to headphones without external op-amps |
| USB Descriptor Programmability | Vendor ID, product ID, and strings modifiable via external ROM (PCM2706) - allows OEM branding and USB-IF certification reuse across product variants |
| Multi-HID Function Support | Up to six HID inputs (HID0–HID2, FUNC0–FUNC3) configurable as mute/volume/playback controls - enables feature-rich USB audio peripherals without MCU |
Applications
| USB Audio Speakers | USB CRT/LCD Monitors |
|---|---|
Use Scenario: Compact powered speaker systems connecting directly to PC/laptop via USB cable, requiring no external power adapter or audio cables. IC Role / Device Role / Timing Role: Primary audio DAC and USB endpoint; handles USB enumeration, isochronous audio streaming, clock recovery, and analog output amplification. Use Value: Eliminates need for separate USB controller, clock generator, and headphone amp - reduces PCB area and component count while maintaining 98 dB SNR. | Use Scenario: Integrated audio output in USB-connected displays where space and cost constraints prohibit discrete audio subsystems. IC Role / Device Role / Timing Role: USB audio interface and analog line/headphone driver; synchronizes playback to USB host timing using SpAct™, avoiding buffer underrun artifacts. Use Value: Enables plug-and-play audio with zero driver installation; 32 Ω headphone drive supports built-in speakers or user headphones without external amplification. |
| USB Audio Interface Boxes | USB-Featured Consumer Audio Products |
Use Scenario: External USB DAC boxes converting digital audio from computers to analog line-level or headphone signals for home hi-fi systems. IC Role / Device Role / Timing Role: Standalone USB audio endpoint with S/PDIF output for digital passthrough and analog outputs for local monitoring. Use Value: Dual-output capability (S/PDIF + analog) allows simultaneous digital recording and analog listening; THD+N ≤ 0.025% ensures fidelity preservation. | Use Scenario: Feature-rich consumer devices such as USB-enabled docks, smart speakers, or gaming headsets requiring HID controls and low-latency audio playback. IC Role / Device Role / Timing Role: Audio processing hub managing USB streaming, HID key scanning (mute/volume/play), and analog/digital output routing. Use Value: Six programmable HID inputs enable full media control without microcontroller; suspend flag (SSPND) supports system-level power management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stereo USB audio DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCM2707PJTR | Same 32-pin TQFP package and pinout; replaces external ROM interface with SPI programming for USB descriptors | Preferred when field-updatable descriptors or smaller external memory footprint is required | Select PCM2707PJTR if descriptor modification during production or firmware updates is needed; otherwise PCM2706PJTR offers simpler ROM-based customization |
| CY7C68013A-56PVXC | USB 2.0 FX2LP microcontroller with no integrated DAC; requires external audio codec and clocking | Suitable for custom USB audio designs needing programmable logic, multiple interfaces, or non-standard descriptors | Choose CY7C68013A-56PVXC only when full firmware control, USB 2.0 bandwidth, or multi-function integration outweighs added BOM complexity and audio performance trade-offs |
Compared with PCM2707PJTR, PCM2706PJTR provides ROM-based descriptor configuration - reducing external component count and simplifying manufacturing. Against CY7C68013A-56PVXC, PCM2706PJTR delivers turnkey audio performance with lower system-level jitter, integrated power regulation, and no firmware development requirement.
Availability
PCM2706PJTR is available at Aetrix Electronics and suitable for USB audio speakers, USB CRT/LCD monitors, and USB audio interface boxes requiring stable component supply, long-term industrial availability, and TI-qualified automotive-grade traceability.
Supply support for PCM2706PJTR 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 technologies with over 50 years of innovation in precision signal chain solutions.
The PCM2706PJTR belongs to TI's Burr-Brown audio DAC product line, engineered specifically for cost-sensitive, driverless USB audio endpoints requiring high-fidelity analog output and minimal external components.
FAQ
What is the primary function of the PCM2706PJTR in a USB audio system?
The PCM2706PJTR serves as a complete USB audio endpoint: it handles USB enumeration, isochronous audio data reception, SpAct™-based clock recovery, 16-bit stereo DAC conversion, analog headphone amplification, and optional S/PDIF or I2S digital output. PCM2706PJTR integrates all functions needed for plug-and-play stereo audio playback without external controllers or clock sources.
Does the PCM2706PJTR require an external crystal oscillator?
No - the PCM2706PJTR includes an on-chip oscillator circuit. It requires only a 12 MHz ±500 ppm crystal connected between XTI (pin 12) and XTO (pin 13), plus appropriate load capacitors. An external clock may be applied to XTI, but XTO must then be left open; however, TI does not recommend this configuration due to lack of clock disable control.
How does the FSEL pin affect the functionality of the PCM2706PJTR?
The FSEL pin (pin 9) selects between two mutually exclusive operating modes: when LOW, PCM2706PJTR configures DOUT as I2S data output and FUNC0–FUNC3 as I2S clocks/data lines; when HIGH, DOUT becomes S/PDIF output and FUNC0–FUNC3 become HID inputs (next track, previous track, stop, play/pause). This pin determines the entire digital interface behavior of PCM2706PJTR.
Can the PCM2706PJTR operate in both bus-powered and self-powered USB configurations?
Yes - PCM2706PJTR supports both configurations. Bus-powered operation uses VBUS (pin 24) as the 5 V supply, while self-powered mode uses 3.3 V on VCCP/VCCL/VCCR/VDD (pins 2, 27, 30, 21). The PSEL pin (pin 16) selects mode and automatically configures the USB descriptor's power attributes and maximum current draw accordingly.
What are the analog output specifications of the PCM2706PJTR when driving headphones?
PCM2706PJTR delivers 12 mW per channel into 32 Ω loads at 0 dBFS with THD+N of 0.025% (bus-powered) or 0.006% (self-powered, RL > 10 kΩ). Outputs VOUTL and VOUTR are single-ended, DC-biased at VCCP/2, and require AC-coupling capacitors. The integrated analog LPF provides –0.1 dB flatness up to 20 kHz.
PCM2706PJTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Audio Signal Processor
- Applications:
- Audio Systems
- Number of Channels:
- 2
- Interface:
- I2S
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Specifications:
- -
- Mounting Type:
- Surface Mount
- Grade:
- -
PCM2706PJTR FAQ
1.How can I place an order for PCM2706PJTR through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2706PJTR 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 PCM2706PJTR reliable?
The price and inventory of PCM2706PJTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2706PJTR is usually 5 days.
3.What payment methods are accepted for PCM2706PJTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2706PJTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2706PJTR?
PCM2706PJTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2706PJTR 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 PCM2706PJTR?
For technical support, including PCM2706PJTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2706PJTR requirements.
6.How does Aetrix verify that PCM2706PJTR is sourced from the original manufacturer or authorized distributors?
All PCM2706PJTR 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 PCM2706PJTR meets industry standards.
7.What is the process for return or replacement of PCM2706PJTR?
All PCM2706PJTR units undergo pre-shipment inspection (PSI). If there is an issue with PCM2706PJTR, 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 PCM2706PJTR part is unused and in its original packaging.
Return procedure for PCM2706PJTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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