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Texas Instruments PCM2900E/2KG4
- Part No.:
- PCM2900E/2KG4
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2900E/2KG4.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,612
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Product details
Overview
PCM2900E/2KG4 from Texas Instruments is a single-chip stereo audio codec with integrated USB 1.1 full-speed interface, 16-bit delta-sigma ADC and DAC, single-ended analog I/O, and no S/PDIF support. It operates from a single 5-V USB bus supply, delivers 89 dB SNR (ADC) and 96 dB SNR (DAC), and supports adaptive playback and asynchronous recording at sampling rates up to 48 kHz. It targets plug-and-play USB audio peripherals requiring low-jitter clock recovery via TI's SpAct™ architecture.
For engineers reviewing the PCM2900E/2KG4 datasheet, PCM2900E/2KG4 pinout, PCM2900E/2KG4 application, or PCM2900E/2KG4 equivalent, key selection considerations include its SSOP-28 package, bus-powered operation, HID volume/mute control capability, absence of S/PDIF, and compatibility with Windows/Mac OS USB Audio Class drivers without custom firmware.
Technical Context
The PCM2900E/2KG4 implements TI's SpAct™ architecture to recover audio clocks directly from USB packet timing, eliminating external crystal oscillators for playback while supporting independent ADC/DAC sampling rates. Its analog front-end integrates antialiasing and low-pass filters, and its digital core includes decimation (ADC) and interpolation (DAC) filters with ±0.05 dB pass-band ripple and 65 dB stop-band attenuation.
USB communication uses four interfaces: a standard audio control interface (IF #0), isochronous data-out (IF #1, adaptive mode), isochronous data-in (IF #2, asynchronous mode), and HID interface (IF #3) for mute/volume control. All descriptors are partially programmable, and the device is USB-IF certified with full-speed transceivers on D+/D– pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 16-bit delta-sigma with 8–48 kHz sampling (supports voice-grade 8/11.025 kHz and CD-grade 44.1/48 kHz) |
| DAC Resolution | 16-bit delta-sigma with 32/44.1/48 kHz fixed-rate playback |
| Analog Performance | ADC: THD+N = 0.01%, SNR = 89 dB; DAC: THD+N = 0.005%, SNR = 96 dB (VBUS = 5 V, fS = 44.1 kHz) |
| USB Interface | Full-speed (12 Mbps), USB 1.1 compliant, bus-powered, certified by USB-IF, no host driver required |
| Power Supply | Single 5-V input (VBUS = 4.35–5.25 V); internal LDOs generate 3.3-V analog/digital rails |
| Operating Temp | –25°C to +85°C ambient; thermal resistance θJA = 100°C/W |
| Package | 28-pin SSOP (28DB), lead pitch 0.65 mm, body size 10.2 × 5.3 mm |
Pinout & Package
PCM2900E/2KG4 is housed in a 28-pin SSOP (Small Outline Package) with 0.65 mm lead pitch, optimized for compact USB audio designs. Pin functions are validated per TI SLES035E datasheet revision March 2008.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential I/O | LV-TTL level full-speed USB transceiver interface; requires 27-Ω series resistors and 1.5-kΩ pull-up on D+ |
| VINL, VINR | ADC analog inputs | Single-ended voltage inputs referenced to VCOM (VCCCI/2); support 0.6×VCCCI p-p full-scale swing |
| VOUTL, VOUTR | DAC analog outputs | Single-ended voltage outputs with integrated LPF; 0.6×VCCCI p-p swing into ≥10-kΩ load |
| HID0–HID2 | HID control inputs | 3.3-V CMOS active-high inputs for mute (HID0), volume up (HID1), volume down (HID2); internal pulldowns |
| SSPND | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used for system power management |
| XTI, XTO | Crystal oscillator interface | Supports 12-MHz fundamental-mode crystal (11.994–12.008 MHz); enables on-chip PLL for SpAct clock recovery |
| VCCCI, VCCP1I, VCCP2I, VCCXI, VDDI | Internal power supplies | Dedicated analog/digital LDO outputs; each requires 0.1-µF decoupling capacitor to AGND/DGND |
| AGNDC, AGNDP, AGNDX, DGND, DGNDU | Ground terminals | Separate analog grounds for codec/PLL/oscillator and digital grounds for core/USB to minimize noise coupling |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates need for separate audio master clock; recovers low-jitter 44.1/48 kHz from USB packet timing for playback |
| Integrated Analog Filters | On-chip antialiasing (ADC) and low-pass (DAC) filters reduce external component count and layout sensitivity |
| HID Volume/Mute Control | Hardware-accelerated volume adjustment (0 to –64 dB in 1-dB steps) and mute via standard USB HID class-no custom driver needed |
| Bus-Powered Operation | Draws ≤67 mA during ADC+DAC operation at 5 V; meets USB 1.1 power budget (100 mA max) with margin for suspend mode (210 µA) |
| Partially Programmable Descriptors | Vendor ID, Product ID, and string descriptors can be modified for OEM branding without mask change |
Applications
| USB Audio Speaker | USB Headset |
|---|---|
Use Scenario: Compact desktop speaker with USB plug-and-play connectivity and hardware volume/mute buttons. IC Role / Device Role / Timing Role: Stereo DAC outputs drive line-level amplifiers; SpAct ensures jitter-free playback; HID pins interface to front-panel controls. Use Value: Eliminates external clock source and audio controller MCU; reduces BOM by integrating USB protocol, ADC/DAC, and HID logic in one SSOP-28 IC. | Use Scenario: Dual-mic mono headset for VoIP conferencing with plug-and-play OS compatibility. IC Role / Device Role / Timing Role: ADC digitizes mic signals asynchronously; DAC renders PC audio adaptively; SSPND enables automatic low-power sleep during silence. Use Value: Supports 8/16 kHz telephony sampling natively; HID mute button maps directly to USB class request-no firmware development required. |
| USB Monitor Audio | USB Audio Interface Box |
Use Scenario: Integrated speakers in LCD monitors using USB for both power and audio transport. IC Role / Device Role / Timing Role: DAC receives isochronous audio from host; VBUS powers entire audio subsystem; analog outputs feed Class AB amplifier stage. Use Value: Single 5-V rail powers codec and amp; ±0.05 dB pass-band ripple preserves frequency response integrity across 20 Hz–20 kHz. | Use Scenario: External audio adapter converting USB to analog line-in/line-out for legacy equipment. IC Role / Device Role / Timing Role: Bidirectional stereo conversion: ADC captures analog input, DAC renders host audio; USB handles all transport and control. Use Value: Asynchronous record path tolerates host timing variations; 89 dB SNR ensures clean capture of instrument-level signals without external preamp. |
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 |
|---|---|---|---|
| PCM2902E/2KG4 | Includes S/PDIF input/output; identical pinout and USB/audio functionality otherwise | Required when digital optical/coaxial audio I/O is needed alongside analog I/O | Select PCM2902E/2KG4 only if S/PDIF is mandatory; PCM2900E/2KG4 saves cost and board space where S/PDIF is unused |
| CY7C65632-56LTXC | USB 2.0 hub + audio codec combo; requires external ADC/DAC; no integrated SpAct or analog filters | Used in multi-function hubs needing USB expansion plus basic audio, not dedicated audio endpoints | CY7C65632 adds hub functionality but increases design complexity and external component count versus standalone PCM2900E/2KG4 |
Compared with PCM2902E/2KG4, PCM2900E/2KG4 removes S/PDIF circuitry to reduce power and cost while retaining identical analog performance and USB HID control. Versus CY7C65632, PCM2900E/2KG4 delivers complete audio subsystem integration-including SpAct clock recovery and analog filtering-in a single SSOP-28 package.
Availability
PCM2900E/2KG4 is available at Aetrix Electronics and suitable for USB audio speaker, USB headset, and USB monitor audio applications requiring stable component supply and long-term industrial availability.
Supply support for PCM2900E/2KG4 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 PCM2900 family was designed as a cost-optimized, fully integrated USB audio solution for consumer and computing peripherals-emphasizing plug-and-play compatibility, minimal external components, and robust ESD tolerance in SSOP packaging.
FAQ
What is the maximum sampling rate supported by the PCM2900E/2KG4 DAC?
The PCM2900E/2KG4 DAC supports fixed sampling rates of 32 kHz, 44.1 kHz, and 48 kHz for stereo playback. It does not support variable or higher rates such as 96 kHz. The 44.1 kHz rate aligns with CD-quality audio, and the device uses adaptive USB mode for playback to accommodate host timing variations without buffer underruns.
Does the PCM2900E/2KG4 require an external crystal oscillator?
Yes, the PCM2900E/2KG4 requires a 12-MHz fundamental-mode crystal connected between XTI and XTO pins. This crystal feeds the on-chip PLL used by TI's SpAct™ architecture to recover precise audio clocks from USB packet timing-enabling jitter-free playback without a separate master clock generator.
Can the PCM2900E/2KG4 operate from a 3.3-V supply instead of 5 V?
No, the PCM2900E/2KG4 is specified for VBUS = 4.35 V to 5.25 V only. Its internal LDOs generate regulated 3.3-V analog and digital supplies, but the input must be 5-V USB bus power. Operating below 4.35 V may cause functional failure or degraded SNR/THD+N performance per the absolute maximum ratings table.
How does the HID volume control function on the PCM2900E/2KG4?
The PCM2900E/2KG4 implements HID volume control via hardware: HID0 (mute), HID1 (volume up), and HID2 (volume down) are CMOS inputs with internal pulldowns. Pressing these buttons sends standard USB HID class requests to the host, triggering OS-level volume adjustments without custom driver code or MCU intervention.
Is the PCM2900E/2KG4 pin-compatible with the PCM2902E/2KG4?
Yes, the PCM2900E/2KG4 and PCM2902E/2KG4 share identical 28-pin SSOP packaging and pin assignments. The only functional difference is that PCM2902E/2KG4 adds S/PDIF input (DIN) and output (DOUT) pins-replacing TEST0 and TEST1 on the PCM2900E/2KG4. For designs not requiring S/PDIF, the parts are drop-in replacements.
PCM2900E/2KG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 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:
- 28-SSOP
PCM2900E/2KG4 FAQ
1.How can I place an order for PCM2900E/2KG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2900E/2KG4 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 PCM2900E/2KG4 reliable?
The price and inventory of PCM2900E/2KG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2900E/2KG4 is usually 5 days.
3.What payment methods are accepted for PCM2900E/2KG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2900E/2KG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2900E/2KG4?
PCM2900E/2KG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2900E/2KG4 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 PCM2900E/2KG4?
For technical support, including PCM2900E/2KG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2900E/2KG4 requirements.
6.How does Aetrix verify that PCM2900E/2KG4 is sourced from the original manufacturer or authorized distributors?
All PCM2900E/2KG4 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 PCM2900E/2KG4 meets industry standards.
7.What is the process for return or replacement of PCM2900E/2KG4?
All PCM2900E/2KG4 units undergo pre-shipment inspection (PSI). If there is an issue with PCM2900E/2KG4, 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 PCM2900E/2KG4 part is unused and in its original packaging.
Return procedure for PCM2900E/2KG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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