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Texas Instruments PCM2901EG4
- Part No.:
- PCM2901EG4
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2901EG4.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,506
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Product details
Overview
PCM2901EG4 from Texas Instruments is a single-chip USB 1.1-compliant stereo audio codec with integrated full-speed USB transceiver, 16-bit delta-sigma ADC and DAC, on-chip clock generator (12 MHz crystal input), 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. It is used in USB audio speaker and headset designs requiring compact, low-jitter, plug-and-play analog I/O.
For engineers reviewing the PCM2901EG4 datasheet, PCM2901EG4 pinout, PCM2901EG4 application, or PCM2901EG4 equivalent, this page provides verified technical context, package mapping, real-world use scenarios, validated alternatives, and supply support for industrial audio interface development.
Technical Context
The PCM2901EG4 implements TI's SpAct™ architecture to recover audio clock from USB packet data, enabling low-jitter playback and independent ADC/DAC sampling without external PLLs. Its analog front-end includes antialiasing filters (ADC) and low-pass filters (DAC), plus integrated decimation/interpolation digital filters with ±0.05 dB pass-band ripple (ADC) and ±0.1 dB (DAC).
It operates fully compliant with USB Audio Class 1.0, using four interfaces: control (IF #0), isochronous-out streaming (IF #1), isochronous-in streaming (IF #2), and HID (IF #3). Human interface functions (mute/volume up/down) are implemented via dedicated CMOS-level inputs (HID0–HID2) with internal pulldowns, decoupled from audio signal paths.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit delta-sigma ADC and DAC - enables CD-quality audio digitization and reconstruction |
| THD+N (DAC) | 0.005% at 0 dB output - ensures clean playback with minimal harmonic distortion |
| SNR (DAC) | 96 dB A-weighted - supports high-fidelity analog output with wide dynamic range |
| Sampling Rates | DAC: 32/44.1/48 kHz; ADC: 8–48 kHz - covers standard audio formats including CD, DAT, and VoIP |
| USB Compliance | Fully compliant with USB 1.1 specification and certified by USB-IF - guarantees host interoperability without driver customization |
| Supply Voltage | 3.3 V ±0.3 V across all rails (VDD, VCCC, VCCP1, VCCP2, VCCX) - simplifies single-supply system design |
| Operating Temperature | –25°C to +85°C - suitable for commercial and industrial ambient environments |
Pinout & Package
PCM2901EG4 is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.64 mm pitch, JEDEC MO-153 compliant, and rated for –25°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential I/O | LV-TTL level full-speed USB transceiver interface; requires 27 Ω series termination per line |
| VINL, VINR | ADC analog inputs | Single-ended voltage inputs (0.6 VCCC p-p); referenced to VCOM (VCCC/2) |
| VOUTL, VOUTR | DAC analog outputs | Single-ended voltage outputs (0.6 VCCC p-p); include on-chip analog LPF |
| HID0, HID1, HID2 | HID control inputs | 3.3-V CMOS active-high mute/volume-up/volume-down signals; internally pulled down |
| SSPND | Suspend flag output | Active-low open-drain signal indicating USB suspend state (low = suspended) |
| XTI, XTO | Crystal oscillator interface | 3.3-V CMOS inputs/outputs for 12 MHz fundamental-mode crystal (±6 kHz tolerance) |
| VCCC, VCCP1, VCCP2, VCCX, VDD | Analog/digital power supplies | Five separate 3.3 V rails - require individual 0.1 µF decoupling to respective AGND/DGND planes |
| AGNDC, AGNDP, AGNDX, DGND, DGNDU | Ground terminals | Physically isolated analog/digital grounds - must be connected at single point on PCB |
Key Features
| Feature | Design Value |
|---|---|
| On-chip USB protocol controller | Zero firmware requirement - handles enumeration, isochronous transfers, and HID reporting autonomously |
| SpAct™ clock recovery | Eliminates need for separate audio PLL; achieves low-jitter playback/record with independent sampling clocks |
| Programmable USB descriptors | Vendor ID/product ID and string descriptors modifiable via mask ROM - enables OEM branding without custom silicon |
| Integrated analog filters | On-die antialiasing (ADC) and low-pass (DAC) filters - reduce external component count and layout sensitivity |
| Self-powered USB operation | Draws <252 mA from VBUS - meets USB 1.1 self-powered device limit without auxiliary supply |
| HID volume/mute control | Dedicated hardware inputs (HID0–HID2) mapped to standard USB Audio Class HID interface - no host driver changes needed |
Applications
| USB Audio Speaker | USB Headset |
|---|---|
Use Scenario: Standalone desktop speaker with USB plug-and-play connectivity and hardware volume/mute controls. IC Role / Device Role / Timing Role: Audio codec handling USB-to-analog conversion, clock recovery via SpAct™, and HID key reporting. Use Value: Eliminates need for separate USB controller, audio PLL, and analog filter components - reduces BOM cost and board area by >30%. |
Use Scenario: Dual-mic mono headset for VoIP conferencing with hardware mute button and plug-and-play Windows/macOS compatibility. IC Role / Device Role / Timing Role: Stereo ADC captures mic signals; DAC drives earpiece; HID0 reports mute status to OS. Use Value: Supports 8–48 kHz sampling - enables narrowband (8 kHz) VoIP and wideband (44.1/48 kHz) music modes in same hardware. |
| USB Monitor Audio Out | USB Audio Interface Box |
Use Scenario: All-in-one monitor with built-in speakers powered solely from USB bus, no external adapter. IC Role / Device Role / Timing Role: Self-powered stereo DAC delivering line-level output; SSPND monitors USB suspend to disable amplifiers. Use Value: 210 µA suspend current enables energy-efficient display sleep mode without audio subsystem wakeups. |
Use Scenario: Compact external audio interface for laptops, supporting microphone input and headphone output over single USB cable. IC Role / Device Role / Timing Role: Simultaneous 2-channel ADC and DAC operation with independent sampling rate selection (e.g., 44.1 kHz in, 48 kHz out). Use Value: On-chip digital volume control (0 to –64 dB in 1-dB steps) allows precise gain matching between mic preamp and DAC output without external attenuators. |
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 | Includes S/PDIF input/output (DIN/DOUT pins); otherwise identical pinout, specs, and USB functionality | Required when optical digital audio I/O is needed alongside USB analog path | Select PCM2903E only if S/PDIF capability is mandatory; PCM2901EG4 avoids unused S/PDIF circuitry and associated layout complexity |
| CY7C65632 | USB 2.0 hub + audio codec combo; requires external DAC/ADC; no integrated SpAct™ or analog filters | Used in multi-peripheral USB hubs with basic audio passthrough, not standalone audio endpoints | Not a functional substitute: CY7C65632 lacks integrated ADC/DAC, analog filtering, and clock recovery - unsuitable for direct PCM2901EG4 replacement |
Compared with PCM2903E, PCM2901EG4 offers identical USB audio performance and footprint but omits S/PDIF circuitry - reducing cost and simplifying layout where optical I/O is unnecessary. Unlike CY7C65632, PCM2901EG4 is a complete, self-contained audio endpoint requiring zero external signal chain components.
Availability
PCM2901EG4 is available at Aetrix Electronics and suitable for USB audio speaker, USB headset, and USB monitor audio out applications requiring stable component supply, long-term industrial availability, and consistent electrical performance across production batches.
Supply support for PCM2901EG4 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 expertise in precision audio signal chains.
The PCM2901EG4 belongs to TI's legacy Burr-Brown audio codec product line, designed specifically for cost-sensitive, space-constrained USB audio peripherals requiring zero-host-software audio stack integration and robust ESD-tolerant analog I/O.
FAQ
What is the maximum sampling rate supported by PCM2901EG4 for ADC and DAC operations?
The PCM2901EG4 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. At 44.1 kHz, it achieves 89 dB SNR (ADC) and 96 dB SNR (DAC), making it suitable for CD-quality audio capture and playback without oversampling artifacts.
Does PCM2901EG4 require an external crystal oscillator?
Yes, PCM2901EG4 requires a 12 MHz fundamental-mode crystal connected between XTI (pin 21) and XTO (pin 20). The crystal must meet ±6 kHz frequency tolerance (±0.05%) and operate within the specified load capacitance range; no external oscillator module or clock source is supported.
Can PCM2901EG4 operate in bus-powered mode?
No - PCM2901EG4 is strictly self-powered. It draws up to 252 mA during active operation and must be supplied from a regulated 3.3 V source. VBUS (pin 3) is used only as a logic-level indicator and must be tied to VDD; it does not power the device.
How is volume control implemented in PCM2901EG4?
PCM2901EG4 implements digital volume control via USB Audio Class requests targeting Feature Unit #3. Volume is adjustable from 0 dB to –64 dB in 1-dB increments per channel, updated synchronously with the audio sample clock (1/fS interval). Master volume control is not supported; requests are processed per-channel only.
What are the absolute maximum ratings for analog supply voltages on PCM2901EG4?
The absolute maximum rating for all analog supplies (VCCC, VCCP1, VCCP2, VCCX) and digital supply (VDD) is –0.3 V to +4.0 V. Exceeding +4.0 V or violating the ±0.1 V inter-rail differential limit risks permanent damage. Recommended operating range remains 3.0 V to 3.6 V, with 3.3 V nominal.
PCM2901EG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- 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
PCM2901EG4 FAQ
1.How can I place an order for PCM2901EG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2901EG4 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 PCM2901EG4 reliable?
The price and inventory of PCM2901EG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2901EG4 is usually 5 days.
3.What payment methods are accepted for PCM2901EG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2901EG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2901EG4?
PCM2901EG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2901EG4 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 PCM2901EG4?
For technical support, including PCM2901EG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2901EG4 requirements.
6.How does Aetrix verify that PCM2901EG4 is sourced from the original manufacturer or authorized distributors?
All PCM2901EG4 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 PCM2901EG4 meets industry standards.
7.What is the process for return or replacement of PCM2901EG4?
All PCM2901EG4 units undergo pre-shipment inspection (PSI). If there is an issue with PCM2901EG4, 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 PCM2901EG4 part is unused and in its original packaging.
Return procedure for PCM2901EG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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