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Texas Instruments PCM2901E/2K
- Part No.:
- PCM2901E/2K
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2901E/2K.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,530
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Product details
Overview
PCM2901E/2K from Texas Instruments is a single-chip USB 1.1 stereo audio codec with integrated full-speed USB transceiver, 16-bit delta-sigma ADC and DAC, and self-powered operation. It delivers THD+N = 0.01% (ADC) and 0.005% (DAC), SNR = 89 dB (ADC) / 96 dB (DAC), and supports sampling rates up to 48 kHz for playback and record in USB adaptive/asynchronous modes - used in USB headsets and audio interface boxes.
For engineers reviewing the PCM2901E/2K datasheet, PCM2901E/2K pinout, PCM2901E/2K application, or PCM2901E/2K equivalent, this device requires attention to its SSOP-28 package, dual analog/digital ground separation (AGNDC/AGNDP/DGND), SpAct™ clock recovery architecture, and absence of S/PDIF functionality compared to PCM2903.
Technical Context
The PCM2901E/2K implements TI's SpAct™ architecture to recover audio clocks directly from USB packet data, enabling low-jitter playback and independent ADC/DAC sampling without external crystal PLL tuning. Its on-chip USB protocol controller operates fully compliant with USB 1.1 and requires no firmware - only programmable descriptors (vendor ID/product ID) for host enumeration.
It integrates analog antialiasing and reconstruction filters, decimation/interpolation digital filters, and a 12-MHz crystal oscillator interface (XTI/XTO). The device uses five isolated power domains (VCCC, VCCP1, VCCP2, VCCX, VDD) with dedicated analog/digital grounds to maintain signal integrity across ADC (8–48 kHz) and DAC (32–48 kHz) paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| USB Compliance | Fully compliant with USB 1.1 specification; certified by USB-IF; no host driver required on Windows/Mac OS. |
| ADC Performance | THD+N = 0.01% at –0.5 dBFS, SNR = 89 dB (A-weighted), dynamic range = 89 dB - sufficient for consumer-grade headset microphone input. |
| DAC Performance | THD+N = 0.005% at 0 dBFS, SNR = 96 dB (EIAJ/A-weighted), dynamic range = 93 dB - meets CD-quality analog output requirements. |
| Sampling Rates | ADC: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz; DAC: 32, 44.1, 48 kHz - supports standard audio formats including CD (44.1 kHz) and DAT (48 kHz). |
| Power Supply | Single 3.3 V supply (3.0–3.6 V); 70 mA typical operating current; 210 µA suspend mode - enables direct USB bus power without LDO overhead. |
| Package & Temp | SSOP-28 (28DB marking), –25°C to +85°C industrial temperature range - suitable for compact, thermally constrained USB peripheral designs. |
| Digital Interface | USB isochronous endpoints for stereo audio streaming; HID-class volume/mute control via HID0/HID1/HID2 pins - enables plug-and-play hardware-level controls. |
Pinout & Package
PCM2901E/2K is housed in a 28-pin Shrink Small Outline Package (SSOP) with 0.65 mm pitch, JEDEC MO-153 compliant, moisture sensitivity level (MSL) 3. Pin functions are validated per TI SLES034C datasheet Figure 1 (PCM2901 top view) and Terminal Functions table (pages 7–8).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential I/O | LV-TTL level USB 1.1 full-speed transceiver interface; requires 27 Ω series termination and ESD protection per USB spec. |
| VINL, VINR | ADC analog inputs | Single-ended voltage inputs referenced to VCOM (VCCC/2); 30 kΩ input impedance; accept 0.6×VCCC p-p signals. |
| VOUTL, VOUTR | DAC analog outputs | Single-ended voltage outputs; 0.6×VCCC p-p swing into 10 kΩ AC-coupled load; include on-chip analog LPF (–3 dB @ 250 kHz). |
| AGNDC, AGNDP, AGNDX, DGND, DGNDU | Analog/digital ground terminals | Five isolated ground pins prevent noise coupling between codec, PLL, oscillator, and USB transceiver domains. |
| SEL0, SEL1 | Configuration inputs | TTL Schmitt-trigger inputs; SEL0 must be high, SEL1 tied to VBUS - configure USB device mode and power detection. |
| SSPND | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used to gate external circuitry power during host sleep. |
| XTI, XTO | Crystal oscillator interface | 3.3-V CMOS inputs/outputs for 12 MHz ±6 kHz fundamental-mode crystal; internal load caps eliminate external capacitors. |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates need for separate audio PLL; recovers low-jitter 44.1/48 kHz clocks directly from USB packet timing - reduces BOM and layout complexity. |
| Integrated Analog Filters | On-chip antialiasing (ADC) and reconstruction (DAC) filters meet anti-imaging requirements without external components - saves PCB space and cost. |
| Self-Powered USB Operation | Draws <70 mA from VBUS; no external regulator needed - simplifies compliance with USB power budget (500 mA max) for Class 1 devices. |
| HID Volume/Mute Control | HID0/HID1/HID2 pins provide hardware-level mute/volume-up/volume-down signaling to host OS - enables physical button integration without MCU. |
| Programmable Descriptors | Vendor ID (0x08BB default) and Product ID (0x2901) can be masked for custom branding - supports OEM differentiation without firmware changes. |
Applications
| USB Headset | USB Audio Interface Box |
|---|---|
Use Scenario: Compact wired headset with mic and speaker connecting directly to PC via USB. IC Role / Device Role / Timing Role: Stereo ADC digitizes microphone signal; stereo DAC drives speaker outputs; SpAct™ provides jitter-free playback clock. Use Value: Eliminates need for separate USB microcontroller and audio codec ICs - reduces component count and latency vs. USB-to-I²S bridge solutions. |
Use Scenario: External audio interface for podcasting or music production with line-in/line-out and headphone amp. IC Role / Device Role / Timing Role: ADC captures analog line input; DAC outputs stereo line/headphone signal; USB handles bidirectional isochronous streaming. Use Value: Supports 44.1/48 kHz sampling with <90 dB SNR - meets professional near-field monitoring requirements without external precision converters. |
| USB Monitor | USB Audio Speaker |
Use Scenario: All-in-one monitor with built-in speakers and mic array for video conferencing. IC Role / Device Role / Timing Role: Dual-channel ADC processes far-field mic input; DAC drives stereo speakers; HID pins enable system-level mute control. Use Value: Integrates audio I/O and USB HID in one chip - avoids adding discrete HID controller for button/mute functionality. |
Use Scenario: Powered desktop speaker system with USB input and volume knob. IC Role / Device Role / Timing Role: DAC converts USB audio stream to analog; analog LPF ensures clean output; SSPND enables auto-suspend when PC sleeps. Use Value: Self-powered operation allows direct USB bus power - eliminates external DC adapter and associated EMI filtering. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stereo USB audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| PCM2903E/2K | Includes S/PDIF input/output (DIN/DOUT pins); otherwise identical pinout, electrical specs, and USB functionality. | Required when optical digital audio I/O is needed; not drop-in compatible due to added S/PDIF pins and different terminal functions. | Select PCM2903E/2K only if S/PDIF support is mandatory; PCM2901E/2K reduces design complexity where optical I/O is unused. |
| CY7C68013A-56PVXC | Firmware-programmable USB 2.0 microcontroller with no integrated ADC/DAC; requires external audio converters and clock management. | Used in highly customizable audio interfaces where sample rate flexibility >48 kHz or multi-channel I/O is required. | Choose CY7C68013A only when full firmware control over USB audio stack and external converter selection is needed - adds development effort and BOM cost. |
Compared with PCM2903E/2K, PCM2901E/2K removes S/PDIF circuitry to reduce cost and simplify layout; compared with CY7C68013A, it delivers turnkey USB audio with zero firmware development but fixed 16-bit/48 kHz limits.
Availability
PCM2901E/2K is available at Aetrix Electronics and suitable for USB headset, USB audio interface box, and USB monitor applications requiring stable component supply, long-term industrial temperature support (–25°C to +85°C), and tape-and-reel delivery for automated assembly.
Supply support for PCM2901E/2K 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 company specializing in analog, embedded processing, and connectivity technologies with over 50 years of innovation in precision signal chain solutions.
The PCM2901 product line delivers integrated USB audio codecs targeting cost-sensitive, low-footprint consumer and industrial peripherals - designed to replace multi-chip USB audio solutions with single-chip simplicity and USB-IF certification.
FAQ
What is the maximum sampling rate supported by PCM2901E/2K for ADC and DAC?
The PCM2901E/2K supports ADC sampling rates of 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz, and DAC sampling rates of 32, 44.1, and 48 kHz. It does not support 96 kHz or higher rates. These values are specified in the Electrical Characteristics tables of the TI SLES034C datasheet and verified across temperature and supply voltage ranges.
Does PCM2901E/2K include S/PDIF functionality?
No, PCM2901E/2K does not include S/PDIF functionality. The datasheet explicitly states "PCM2901: Without S/PDIF" and confirms that S/PDIF input (DIN) and output (DOUT) pins are present only on PCM2903. PCM2901E/2K uses pins 24 and 25 as TEST0 and TEST1, not S/PDIF signals.
What is the purpose of the five separate ground pins on PCM2901E/2K?
The five ground pins - AGNDC (codec), AGNDP (PLL), AGNDX (oscillator), DGND (digital core), and DGNDU (USB transceiver) - isolate noise-sensitive analog domains from digital switching noise. This separation maintains ADC/DAC performance (e.g., 89–96 dB SNR) and prevents USB packet errors caused by ground bounce.
Can PCM2901E/2K operate from USB bus power alone?
Yes, PCM2901E/2K is self-powered and draws ≤70 mA at 3.3 V during operation, well within USB 1.1's 500 mA limit. Its suspend current is 210 µA, and VBUS must be connected to SEL1 and VBUs per datasheet guidance - no external regulator or charge pump is required.
How does the SpAct™ architecture in PCM2901E/2K improve audio performance?
SpAct™ recovers low-jitter audio clocks directly from USB packet timing instead of using a free-running crystal oscillator with PLL. This eliminates reference clock phase noise and reduces DAC jitter - resulting in measured THD+N of 0.005% and SNR of 96 dB, critical for high-fidelity playback without external clock conditioning.
PCM2901E/2K Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Stereo Audio
- Data Interface:
- USB
- Resolution (Bits):
- 16 b
- Number of ADCs / DACs:
- 2 / 2
- Sigma Delta:
- Yes
- S/N Ratio, ADCs / DACs (db) Typ:
- 89 / 96
- Dynamic Range, ADCs / DACs (db) Typ:
- 89 / 93
- Voltage - Supply, Analog:
- 3V ~ 3.6V
- Voltage - Supply, Digital:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
PCM2901E/2K FAQ
1.How can I place an order for PCM2901E/2K through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2901E/2K 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 PCM2901E/2K reliable?
The price and inventory of PCM2901E/2K are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2901E/2K is usually 5 days.
3.What payment methods are accepted for PCM2901E/2K?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2901E/2K transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2901E/2K?
PCM2901E/2K orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2901E/2K 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 PCM2901E/2K?
For technical support, including PCM2901E/2K datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2901E/2K requirements.
6.How does Aetrix verify that PCM2901E/2K is sourced from the original manufacturer or authorized distributors?
All PCM2901E/2K 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 PCM2901E/2K meets industry standards.
7.What is the process for return or replacement of PCM2901E/2K?
All PCM2901E/2K units undergo pre-shipment inspection (PSI). If there is an issue with PCM2901E/2K, 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 PCM2901E/2K part is unused and in its original packaging.
Return procedure for PCM2901E/2K:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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