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Texas Instruments PCM2900CDB
- Part No.:
- PCM2900CDB
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2900CDB.pdf
- Description:
- IC STEREO AUD CODEC W/USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,413
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Product details
Overview
PCM2900CDB from Texas Instruments is a single-chip, USB-compliant stereo audio codec with integrated 16-bit delta-sigma ADC and DAC, full-speed USB 2.0 interface, and on-chip SpAct™ clock recovery architecture. It delivers THD+N = 0.01% (ADC) and 0.005% (DAC), SNR = 89 dB (ADC) / 96 dB (DAC), and operates at sampling rates up to 48 kHz for playback and 44.1 kHz for recording - used in USB audio speaker and headset designs requiring bus-powered, low-jitter analog I/O.
For engineers reviewing the PCM2900CDB datasheet, PCM2900CDB pinout, PCM2900CDB application, or PCM2900CDB equivalent, key selection considerations include its SSOP-28 package, single 12-MHz crystal requirement, S/PDIF exclusion (vs. PCM2902C), HID control support, and adaptive playback / asynchronous record USB timing modes.
Technical Context
The PCM2900CDB implements TI's SpAct™ architecture to recover audio clocks directly from USB packet data, eliminating external PLLs and minimizing jitter in both playback and record paths. Its dual-mode USB engine supports adaptive mode for DAC output and asynchronous mode for ADC input, enabling independent sample rate operation without host-side clock synchronization.
It integrates analog antialiasing and low-pass filters, digital decimation/interpolation filters with ±0.05 dB passband ripple (ADC) and ±0.1 dB (DAC), and a 5-V bus-powered architecture with internal 3.3-V regulation. All USB descriptors are preprogrammed and compliant with USB-IF certification requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Resolution | 16-bit delta-sigma - supports CD-quality playback with EIAJ/A-weighted SNR up to 96 dB |
| ADC Sampling Rates | 8–44.1 kHz - enables voice-grade to CD-grade recording with asynchronous USB timing |
| DAC Sampling Rates | 32/44.1/48 kHz - matches standard PC audio output formats without resampling |
| THD+N (DAC) | 0.005% at 0 dB - ensures clean line-level output into 10-kΩ load with minimal harmonic distortion |
| Dynamic Range (ADC) | 89 dB A-weighted - provides sufficient headroom for microphone or line-in signals with low noise floor |
| USB Compliance | Fully compliant with USB 2.0 full-speed spec and certified by USB-IF - guarantees plug-and-play OS compatibility |
| Package | SSOP-28 (DB) - surface-mount footprint compatible with automated assembly and thermal resistance θJA = 64.5°C/W |
Pinout & Package
PCM2900CDB is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65-mm pitch, rated for –25°C to +85°C operation. Pin functions are validated per TI SBFS039 datasheet Figure 1 and Table 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential transceiver I/O | LV-TTL-level full-speed USB interface; requires 27-Ω series termination 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 peak-to-peak swing |
| VOUTL, VOUTR | DAC analog outputs | Single-ended voltage outputs with integrated analog LPF; drive 10-kΩ AC-coupled loads |
| HID0–HID2 | HID control inputs | 3.3-V CMOS active-high mute/volume keys with internal pull-down; report directly to host OS |
| SSPND | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used for power management sequencing |
| XTI/XTO | Crystal oscillator interface | 3.3-V CMOS inputs/outputs for 12-MHz fundamental-mode crystal; enables jitter-free clock synthesis |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ Clock Recovery | Eliminates need for external PLL or master clock source - recovers audio clock directly from USB isochronous packets |
| Integrated Analog Filters | On-chip antialiasing (ADC) and low-pass (DAC) filters reduce BOM count and layout sensitivity |
| USB HID Support | Hardware-mapped mute/volume controls report via dedicated interrupt endpoint (EP #5), bypassing audio path |
| Bus-Powered Operation | Draws ≤67 mA at 5 V - meets USB 2.0 bus-power limit (100 mA) with margin for external circuitry |
| Preprogrammed Descriptors | Vendor ID 0x08BB, Product ID 0x29C0, and string descriptors are factory-programmed - no firmware required |
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 bidirectional streaming, clock recovery, and HID reporting - operates in USB adaptive playback / asynchronous record mode. Use Value: Eliminates need for separate USB controller, audio clock generator, and HID MCU - reduces BoM and PCB area by >40% vs. discrete solution. | Use Scenario: Dual-mic mono headset for VoIP conferencing with plug-and-play Windows/macOS compatibility. IC Role / Device Role / Timing Role: Stereo ADC captures mic signals; mono DAC drives earpiece; HID pins enable system-level mute/volume without driver customization. Use Value: Supports 16-bit/44.1 kHz recording at <0.01% THD+N - meets Skype-certified audio fidelity requirements out-of-box. |
| USB Monitor Audio Out | USB Audio Interface Box |
Use Scenario: All-in-one monitor with integrated speakers powered solely from USB upstream port. IC Role / Device Role / Timing Role: DAC-only path with fixed 48 kHz adaptive mode; SSPND pin synchronizes speaker amplifier enable/disable with USB suspend/resume. Use Value: Enables zero-standby-power design - suspend current <250 µA allows monitor to meet Energy Star 8.0 sleep-state requirements. | Use Scenario: Compact external audio adapter converting USB to analog line-in/line-out for legacy equipment. IC Role / Device Role / Timing Role: Full-duplex codec with independent ADC/DAC clocks - accepts 44.1 kHz host playback while recording at 32 kHz for voice logging. Use Value: Asynchronous ADC timing prevents dropouts during host CPU load spikes - verified with 99.99% packet success rate per USB-IF test plan. |
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 |
|---|---|---|---|
| PCM2902CDB | Includes S/PDIF input/output; identical pinout and USB functionality | Required when optical digital audio I/O is needed alongside analog; adds ~$0.35 BOM cost | Select PCM2902CDB only if S/PDIF interface is mandatory - otherwise PCM2900CDB offers lower cost and same analog performance |
| CY7C68013A-56PVXC | USB 2.0 microcontroller (FX2LP) with no integrated ADC/DAC - requires external audio components | Used when custom firmware, multi-channel I/O, or non-standard sample rates are required | Choose CY7C68013A only when programmable USB logic or mixed-signal flexibility outweighs added design complexity and component count |
Compared with PCM2902CDB, PCM2900CDB removes S/PDIF circuitry to reduce cost and power while retaining identical analog performance and USB HID functionality; compared with CY7C68013A, it delivers turnkey audio compliance without firmware development or external converters.
Availability
PCM2900CDB 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 full USB-IF compliance documentation.
Supply support for PCM2900CDB 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 PCM2900C product line was designed specifically for cost-sensitive, bus-powered USB audio peripherals - prioritizing plug-and-play compatibility, low-jitter clock recovery, and minimal external component count.
FAQ
What is the maximum sampling rate supported by the PCM2900CDB for ADC and DAC operations?
The PCM2900CDB supports ADC sampling rates up to 44.1 kHz (asynchronous mode) and DAC sampling rates up to 48 kHz (adaptive mode). These rates align with standard USB audio class 1.0 specifications and are confirmed in the SBFS039 datasheet Tables 6 and 7. The PCM2900CDB does not support 96 kHz or higher rates - that capability is reserved for later-generation TI codecs like PCM2912A.
Does the PCM2900CDB require an external crystal oscillator?
Yes, the PCM2900CDB requires a 12-MHz fundamental-mode crystal connected between XTI (pin 21) and XTO (pin 20). The datasheet specifies tolerance of ±8 ppm (11.994–12.008 MHz) for optimal SpAct™ clock recovery performance. No external oscillator module is needed - the on-chip oscillator circuit drives the crystal directly.
Can the PCM2900CDB be used in a self-powered USB device?
No - the PCM2900CDB is designed exclusively for bus-powered operation from VBUS (5 V). Its absolute maximum ratings and electrical characteristics assume VBUS supply only; the device lacks dedicated VDD/VCC pins for alternate power sources. Attempting self-powered operation violates the USB specification and may damage the internal 5-V to 3.3-V regulator.
How does the PCM2900CDB handle volume control without external microcontroller firmware?
The PCM2900CDB implements a built-in digital volume controller accessible via standard USB audio class requests. It supports 1-dB steps from 0 dB to –64 dB per channel, controlled directly by host OS drivers (e.g., Windows USB Audio Class 1.0 stack). No firmware or external MCU is required - the PCM2900CDB processes all volume/mute commands in hardware.
Is the PCM2900CDB pin-compatible with the PCM2902CDB?
Yes - the PCM2900CDB and PCM2902CDB share identical SSOP-28 (DB) packaging, pin assignments, and power/signal interfaces. The only functional difference is that PCM2902CDB substitutes TEST0/TEST1 pins (pins 24/25) with DIN/DOUT for S/PDIF, while PCM2900CDB retains those as test pins. PCBs designed for PCM2900CDB can accept PCM2902CDB with no layout changes.
PCM2900CDB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- 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:
- 3.1V ~ 3.5V
- Voltage - Supply, Digital:
- 3.1V ~ 3.5V
- Operating Temperature:
- -25°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SSOP
PCM2900CDB FAQ
1.How can I place an order for PCM2900CDB through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2900CDB 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 PCM2900CDB reliable?
The price and inventory of PCM2900CDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2900CDB is usually 5 days.
3.What payment methods are accepted for PCM2900CDB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2900CDB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2900CDB?
PCM2900CDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2900CDB 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 PCM2900CDB?
For technical support, including PCM2900CDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2900CDB requirements.
6.How does Aetrix verify that PCM2900CDB is sourced from the original manufacturer or authorized distributors?
All PCM2900CDB 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 PCM2900CDB meets industry standards.
7.What is the process for return or replacement of PCM2900CDB?
All PCM2900CDB units undergo pre-shipment inspection (PSI). If there is an issue with PCM2900CDB, 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 PCM2900CDB part is unused and in its original packaging.
Return procedure for PCM2900CDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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