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Texas Instruments PCM2912PJTR
- Part No.:
- PCM2912PJTR
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 32-TQFP
- Datasheet:
-
PCM2912PJTR.pdf
- Description:
- IC AUDIO CODEC 16BIT USB 32TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,262
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Product details
Overview
PCM2912PJTR from Texas Instruments is a single-chip USB 2.0-compliant stereo audio codec with integrated full-speed USB protocol controller, mono microphone ADC, and stereo headphone DAC. It delivers 16-bit resolution, sampling rates up to 48 kHz, THD+N ≤ 0.02% at 5 V, and 92 dB SNR - enabling plug-and-play USB headset and speaker applications without host driver customization.
For engineers reviewing the PCM2912PJTR datasheet, PCM2912PJTR pinout, PCM2912PJTR application, or PCM2912PJTR equivalent, key selection criteria include its bus-powered operation (4.35–5.25 V), SpAct™ clock recovery architecture, programmable sidetone/PGA/attenuator controls, and TQFP-32 package compatibility with USB audio class 1.0 host stacks.
Technical Context
The PCM2912PJTR integrates a USB 2.0 full-speed transceiver with adaptive isochronous playback and asynchronous isochronous record transfer modes. Its SpAct™ architecture recovers audio clocks directly from USB packet data, eliminating external crystal oscillators for playback while supporting independent sample rate control for ADC and DAC paths.
It implements dual delta-sigma converters: a mono 16-bit ADC with microphone bias (0.75×VCCA), +20 dB mic amp, and –12 to +30 dB PGA; and a stereo 16-bit DAC with headphone amplifiers delivering 13 mW into 32 Ω. All analog filtering - antialiasing (ADC), LPF (DAC), HPF (ADC), and digital decimation/interpolation - is fully on-chip.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit ADC and DAC - supports CD-quality audio streaming without dithering or bit-depth conversion overhead |
| Sampling Rates | 8–48 kHz (including 44.1 kHz and 48 kHz) - matches standard USB audio class 1.0 timing requirements |
| THD+N (DAC) | 0.02% at 32 Ω load - ensures low distortion in direct-drive headphone applications |
| SNR / Dynamic Range | 92 dB A-weighted - enables high-fidelity voice capture and playback in noise-sensitive environments |
| USB Compliance | Fully compliant with USB 2.0 specification and certified by USB-IF - guarantees interoperability with Windows/macOS/Linux USB audio stacks |
| Power Supply | Single 5 V bus-powered supply (4.35–5.25 V) - eliminates need for external regulators in USB-peripheral designs |
| Package | 32-pin TQFP (7 mm × 7 mm, 0.8 mm pitch) - compatible with standard reflow assembly and compact PCB layouts |
Pinout & Package
PCM2912PJTR is housed in a 32-pin Thin Quad Flat Package (TQFP) with 0.8 mm lead pitch and exposed thermal pad (not electrically connected). Pin assignments are fixed per TI SLES216 datasheet Rev. FEBRUARY 2008.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VBUS (Pin 2) | USB power input | Accepts 4.35–5.25 V from USB host; powers all internal regulators including VDD, VCCA, VCCL, VCCR, VCCP |
| D+, D– (Pins 4, 3) | USB differential interface | LV-TTL level full-speed USB transceiver; requires 27 Ω series resistors and ESD protection per USB spec |
| VIN (Pin 16) | Microphone analog input | Single-ended electret mic input with internal +20 dB amplifier and –12 to +30 dB PGA |
| MBIAS (Pin 17) | Microphone bias output | 0.75×VCCA, 2 mA low-noise source - directly drives electret capsules without external bias circuitry |
| VOUTL / VOUTR (Pins 18, 22) | Stereo headphone outputs | Capable of 13 mW into 32 Ω; require AC-coupling capacitors and optional external LC filters per layout guidelines |
| SSPND (Pin 29) | USB suspend status flag | Open-drain output indicating USB suspend state (LOW = suspended); used for system power management |
| REC / PLAY (Pins 31, 32) | Audio activity status outputs | 5 V-tolerant open-drain flags showing real-time record/playback state - useful for LED indicators or MCU monitoring |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates need for separate audio PLL or master clock source - recovers precise audio timing directly from USB packet stream |
| Programmable Sidetone Attenuator | 0 to –76 dB in 1 dB steps - enables adjustable real-time microphone monitoring without analog feedback loops |
| Integrated Analog Filters | On-chip antialiasing (ADC), LPF (DAC), and HPF (ADC) - removes requirement for external passive RC networks |
| USB Audio Class 1.0 Compliance | Pre-configured descriptors (Vendor ID 0x08BB, Product ID 0x2910) - works out-of-box with standard OS drivers; no custom firmware needed |
| Bus-Powered Operation | Configurable 100 mA / 500 mA current draw via POWER pin (Pin 24) - supports both low-power and high-output headphone configurations |
Applications
| USB Headset | USB Speaker |
|---|---|
Use Scenario: Plug-and-play wired headset for VoIP calls, video conferencing, and remote workstations. IC Role / Device Role / Timing Role: Audio codec handling bidirectional USB isochronous streams, microphone preamplification, sidetone mixing, and headphone amplification. Use Value: Delivers 92 dB SNR and 0.02% THD+N for clear voice capture and playback; SpAct™ ensures jitter-free timing without external clock components. | Use Scenario: Compact desktop or monitor-integrated speaker with USB audio input and no auxiliary jack. IC Role / Device Role / Timing Role: Stereo DAC and headphone amplifier driving dual 32 Ω loads; USB interface handles host-to-device streaming only. Use Value: 13 mW per channel into 32 Ω enables direct drive of small speakers; bus-powered design simplifies enclosure integration. |
| USB Audio Interface Box | Video Conference System |
Use Scenario: External USB audio adapter converting analog mic/headphone signals to digital USB streams for laptops lacking 3.5 mm jacks. IC Role / Device Role / Timing Role: Mono ADC + stereo DAC bridge between analog peripherals and USB host; manages USB descriptor negotiation and power reporting. Use Value: Full USB-IF certification ensures plug-and-play compatibility; programmable PGA (–12 to +30 dB) accommodates diverse mic sensitivities. | Use Scenario: Integrated audio subsystem in all-in-one video conferencing units with built-in mic array and speaker output. IC Role / Device Role / Timing Role: Central audio processing node handling microphone input conditioning, sidetone generation, and stereo playback with low-latency USB streaming. Use Value: Independent ADC/DAC sample rate control allows optimized voice capture (e.g., 16 kHz) and playback (e.g., 48 kHz); REC/PLAY status pins simplify system-level activity detection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar USB audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCM2902PJTR | 16-bit mono ADC + stereo DAC; lacks sidetone mixer and programmable attenuators; lower THD+N (0.03%) | Targeted at basic USB speaker/headphone applications without microphone monitoring needs | Select when sidetone functionality and fine-grained PGA control are unnecessary and BOM cost is critical |
| MAX9860ETJ+ | 16-bit stereo ADC + stereo DAC; I²S/SPDIF interface instead of native USB; requires external USB microcontroller | Used in designs where USB stack resides on a separate MCU and audio interface is handled over I²S | Select when system already includes a USB-capable MCU and flexibility in audio interface routing is preferred |
Compared with PCM2902PJTR, PCM2912PJTR adds sidetone mixing and finer PGA resolution (1 dB vs. coarse steps), making it superior for headset use; versus MAX9860ETJ+, PCM2912PJTR reduces component count and firmware complexity by integrating full USB protocol handling.
Availability
PCM2912PJTR is available at Aetrix Electronics and suitable for USB headset, USB speaker, and USB audio interface box applications requiring stable component supply, long-term lifecycle support, and consistent electrical performance across production batches.
Supply support for PCM2912PJTR 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 decades of audio signal chain expertise.
The PCM2912PJTR belongs to TI's USB audio codec product line, designed specifically for cost-sensitive, bus-powered consumer audio peripherals requiring zero-driver installation and minimal external components.
FAQ
What USB audio class does the PCM2912PJTR implement?
The PCM2912PJTR implements USB Audio Class 1.0 with three interfaces: control (IF #0), isochronous-out (IF #1), and isochronous-in (IF #2). It uses standard descriptors (Vendor ID 0x08BB, Product ID 0x2910) and requires no custom drivers on Windows, macOS, or Linux - enabling true plug-and-play operation. PCM2912PJTR supports adaptive isochronous transfer for playback and asynchronous isochronous transfer for recording.
Does the PCM2912PJTR require an external crystal oscillator?
No, the PCM2912PJTR includes an on-chip crystal oscillator that accepts a 6 MHz ±500 ppm crystal connected between XTI (Pin 8) and XTO (Pin 7). An external clock may be applied to XTI only, with XTO left open - but TI explicitly advises against this due to lack of clock disable capability and potential reliability impact. The PCM2912PJTR relies on this oscillator for both USB timing and audio clock generation via SpAct™.
How is microphone bias provided on the PCM2912PJTR?
The PCM2912PJTR provides a dedicated low-noise microphone bias output (MBIAS, Pin 17) at 0.75×VCCA with 2 mA drive capability and 5 µVrms output noise (RL = 1 kΩ). This eliminates external bias circuitry for electret condenser microphones. MBIAS must be decoupled to AGND (Pin 13) using a capacitor selected per the crystal load capacitance guidelines to minimize noise coupling into the analog front end.
What are the power consumption characteristics of the PCM2912PJTR?
In active audio operation (ADC+DAC), the PCM2912PJTR draws 85–100 mA at 5 V (425–500 mW), configurable to 100 mA or 500 mA via the POWER pin (Pin 24). In USB suspend mode, it consumes only 220–300 µA (0.8–1 mW). These values are measured at TA = 25°C, VBUS = 5 V, fS = 44.1 kHz - confirming suitability for bus-powered portable USB audio devices.
Can the PCM2912PJTR support independent sampling rates for record and playback?
Yes, the PCM2912PJTR supports independent sampling rates for ADC and DAC paths using its SpAct™ architecture. Playback uses adaptive isochronous transfer synchronized to host USB frame timing, while recording uses asynchronous isochronous transfer with local clock recovery - allowing simultaneous operation at different rates (e.g., 16 kHz record + 48 kHz playback) without clock domain crossing artifacts or buffer underruns.
PCM2912PJTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 32-TQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Type:
- Stereo Audio
- Data Interface:
- USB
- Resolution (Bits):
- 16 b
- Number of ADCs / DACs:
- 1 / 2
- Sigma Delta:
- Yes
- S/N Ratio, ADCs / DACs (db) Typ:
- 92 / 92
- Dynamic Range, ADCs / DACs (db) Typ:
- 90 / 90
- Voltage - Supply, Analog:
- 4.35V ~ 5.25V
- Voltage - Supply, Digital:
- 4.35V ~ 5.25V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-TQFP (7x7)
PCM2912PJTR FAQ
1.How can I place an order for PCM2912PJTR through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2912PJTR 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 PCM2912PJTR reliable?
The price and inventory of PCM2912PJTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2912PJTR is usually 5 days.
3.What payment methods are accepted for PCM2912PJTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2912PJTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2912PJTR?
PCM2912PJTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2912PJTR 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 PCM2912PJTR?
For technical support, including PCM2912PJTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2912PJTR requirements.
6.How does Aetrix verify that PCM2912PJTR is sourced from the original manufacturer or authorized distributors?
All PCM2912PJTR 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 PCM2912PJTR meets industry standards.
7.What is the process for return or replacement of PCM2912PJTR?
All PCM2912PJTR units undergo pre-shipment inspection (PSI). If there is an issue with PCM2912PJTR, 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 PCM2912PJTR part is unused and in its original packaging.
Return procedure for PCM2912PJTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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