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Texas Instruments PCM2900BDB
- Part No.:
- PCM2900BDB
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
PCM2900BDB.pdf
- Description:
- IC STEREO CODEC 8/16B USB 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,103
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Product details
Overview
PCM2900BDB from Texas Instruments is a single-chip, USB-compliant stereo audio codec with integrated 16-bit delta-sigma ADC and DAC, full-speed USB transceiver, on-chip clock generator (12 MHz input), and human interface device (HID) support for mute/volume controls. It delivers THD+N = 0.01% (ADC) and 0.005% (DAC), SNR = 89 dB (ADC) and 96 dB (DAC), and operates from a single 5 V bus supply in SSOP-28 package for USB speaker and headset applications.
For engineers reviewing the PCM2900BDB datasheet, PCM2900BDB pinout, PCM2900BDB application, or PCM2900BDB equivalent, this page provides verified technical context, exact pin functions, real-world audio performance metrics, HID control integration details, and validated alternative parts for USB audio system design and component replacement.
Technical Context
The PCM2900BDB implements TI's SpAct™ architecture to recover audio clocks directly from USB packet data, enabling low-jitter playback and record with independent sampling rates (ADC: 8–48 kHz; DAC: 32/44.1/48 kHz). Its analog front-end includes antialiasing and digital high-pass filters (HPF), while the DAC path integrates an analog low-pass filter (LPF) and oversampling digital interpolation filter with ±0.1 dB passband ripple and –43 dB stop-band attenuation.
It embeds a USB protocol controller compliant with USB 2.0 full-speed specification and certified by USB-IF, requiring no host-side firmware. The device supports USB adaptive mode for playback and asynchronous mode for recording, with partially programmable descriptors (vendor/product ID) and built-in suspend flag (SSPND) for power management.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit delta-sigma ADC/DAC - enables CD-quality audio digitization and reconstruction without external quantization hardware |
| ADC Sampling Rates | 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz - supports legacy voice, telephony, and standard audio formats including CD and MP3 |
| DAC Sampling Rates | 32, 44.1, 48 kHz - matches common PC/media player output rates; no sample-rate conversion required in host software |
| THD+N (DAC) | 0.005% at 0 dB, 44.1 kHz - ensures clean playback with minimal harmonic distortion in consumer audio paths |
| SNR (DAC) | 96 dB A-weighted - provides >15-bit effective resolution, critical for low-noise headphone and speaker amplification stages |
| USB Interface | Full-speed (12 Mbps), USB-IF certified - guarantees plug-and-play compatibility with Windows/Mac/Linux without custom drivers |
| Supply | Single 5 V (VBUS), 56–67 mA typical - eliminates need for multi-rail power supplies; compatible with standard USB ports |
Pinout & Package
PCM2900BDB is housed in a 28-pin SSOP (DB) package with 0.65 mm pitch, rated for –25°C to +85°C operation. Pin assignments are validated per TI SLES229 datasheet Figure 1 and Table 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| D+, D– | USB differential I/O | LV-TTL-level full-speed USB interface; requires 27 Ω series termination and 15 kΩ pull-down on D– per USB spec |
| VINL, VINR | ADC analog inputs | Single-ended voltage inputs referenced to VCOM (VCCCI/2); 30 kΩ input impedance supports line/mic-level interfacing |
| VOUTL, VOUTR | DAC analog outputs | Single-ended voltage outputs (0.6 VCCCI peak-to-peak); include on-chip analog LPF for alias suppression |
| HID0–HID2 | HID control inputs | 3.3-V CMOS active-high inputs with internal pulldown; detect mute/volume up/down key presses without external switches |
| SSPND | Suspend flag output | Active-low open-drain signal indicating USB suspend state; used to gate downstream power rails |
| XTI/XTO | Crystal oscillator interface | Accepts 12 MHz fundamental-mode crystal; enables jitter-free clock recovery via SpAct PLL architecture |
| AGNDC/AGNDP/AGNDX | Analog ground domains | Separate grounds for codec, PLL, and oscillator minimize coupling noise between signal paths |
Key Features
| Feature | Design Value |
|---|---|
| SpAct™ clock recovery | Eliminates external crystal oscillator for DAC/ADC timing; recovers low-jitter audio clock directly from USB isochronous packets |
| Integrated HID interface | Three dedicated CMOS inputs (HID0–HID2) report mute/volume commands to host OS without USB descriptor reprogramming |
| On-chip analog antialiasing & LPF | Removes need for external RC filters; ensures compliance with Nyquist criteria for 48 kHz max sampling rate |
| Programmable USB descriptors | Vendor ID (0x08BB) and Product ID (0x29B0) can be masked for OEM branding without firmware changes |
| Bus-powered operation | Draws ≤67 mA from VBUS; meets USB 2.0 full-speed device power budget (100 mA) with margin for suspend mode (250 µA) |
Applications
| USB Speaker System | USB Headset |
|---|---|
|
Use Scenario: Standalone desktop speaker with USB plug-and-play connectivity, volume/mute buttons, and no auxiliary power adapter. IC Role / Device Role / Timing Role: Audio codec handles ADC (mic input), DAC (speaker output), USB protocol, HID reporting, and clock generation in one chip. Use Value: Reduces BOM count by eliminating separate USB controller, crystal, and analog filters; enables compact PCB layout with single 5 V rail. |
Use Scenario: Dual-function headset supporting microphone input and stereo headphone output over USB, with physical mute button. IC Role / Device Role / Timing Role: PCM2900BDB acts as bidirectional audio endpoint with independent ADC/DAC clocks and HID-triggered mute signaling. Use Value: Achieves <0.01% THD+N on mic path and <0.005% on headphone path-meeting VoIP clarity requirements without post-processing. |
| USB Monitor Audio Hub | USB Audio Interface Box |
|
Use Scenario: All-in-one monitor with integrated speakers and mic, using USB for both video (via DisplayLink) and audio transport. IC Role / Device Role / Timing Role: Audio subsystem coexists with video controller on same USB bus; uses adaptive playback and asynchronous record modes. Use Value: Prevents audio dropouts during high-bandwidth video transfers by decoupling ADC/DAC clocks from USB frame timing. |
Use Scenario: Compact external audio interface for laptops, converting analog line-in/out to USB for DAW software. IC Role / Device Role / Timing Role: Serves as Class 1 USB Audio 1.0 device with zero driver installation; handles sample rate negotiation automatically. Use Value: Delivers 96 dB DAC SNR and 89 dB ADC dynamic range-sufficient for near-field studio monitoring and podcast recording. |
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 |
|---|---|---|---|
| PCM2902BDB | Includes S/PDIF input/output (DIN/DOUT pins); identical ADC/DAC specs, pinout, and USB functionality | Required when optical digital audio I/O is needed alongside analog; adds 2 pins but same SSOP-28 footprint | Select PCM2902BDB only if S/PDIF bridging is part of system architecture; otherwise PCM2900BDB reduces cost and complexity |
| CY7C66113-BZXI | USB 2.0 microcontroller with configurable GPIO and USB audio class firmware; no integrated ADC/DAC or analog front-end | Requires external audio converters, op-amps, and clock sources; supports custom HID/report descriptors beyond mute/volume | Choose CY7C66113-BZXI only for highly customized audio peripherals needing non-standard endpoints or firmware-defined behavior |
Compared with PCM2902BDB, PCM2900BDB removes S/PDIF circuitry to lower cost and power; compared with CY7C66113-BZXI, it delivers turnkey audio functionality without firmware development or external analog components.
Availability
PCM2900BDB is available at Aetrix Electronics and suitable for USB speaker systems, USB headsets, and USB monitor audio hubs requiring stable component supply, long-term lifecycle support, and traceable sourcing for industrial and consumer electronics production.
Supply support for PCM2900BDB 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 solutions, with decades of expertise in precision audio signal chains and USB interface IP.
The PCM2900BDB belongs to TI's Burr-Brown audio codec product line, designed specifically for cost-sensitive, bus-powered USB audio peripherals requiring integrated analog front-end, HID controls, and zero-driver plug-and-play operation.
FAQ
What is the primary function of the PCM2900BDB in a USB audio system?
The PCM2900BDB serves as a complete stereo USB audio codec, integrating a 16-bit delta-sigma ADC, 16-bit delta-sigma DAC, full-speed USB transceiver, on-chip clock generator, and HID interface into a single SSOP-28 package. In a USB audio system, the PCM2900BDB handles analog-to-digital conversion of microphone or line input, digital-to-analog conversion for speaker or headphone output, USB protocol handling, and hardware-level mute/volume control reporting-eliminating the need for external controllers or converters.
Does the PCM2900BDB require an external crystal oscillator?
No, the PCM2900BDB does not require an external crystal oscillator for USB timing, as it uses TI's SpAct™ architecture to recover the audio clock directly from USB packet data. However, it does require a 12 MHz fundamental-mode crystal connected to XTI/XTO pins to generate the internal PLL reference clock (96 MHz) for ADC/DAC oversampling and digital filtering-this crystal is mandatory and specified in the PCM2900BDB datasheet.
How does the PCM2900BDB handle USB suspend mode?
The PCM2900BDB asserts its SSPND pin low during USB suspend mode, providing a hardware flag for system-level power gating. In suspend, supply current drops to 250 µA (typical), meeting USB 2.0 low-power requirements. The PCM2900BDB automatically resumes operation upon USB resume signaling, with no firmware intervention needed-the USB protocol controller manages state transitions autonomously.
Can the PCM2900BDB support microphone input with bias voltage?
The PCM2900BDB does not provide electret microphone bias voltage internally. Its VINL/VINR inputs are single-ended, DC-coupled, and referenced to VCOM (VCCCI/2), with 30 kΩ input impedance and 0.6 VCCCI full-scale range. For electret mic use, an external bias network (e.g., pull-up resistor + AC coupling capacitor) must be added-TI's reference designs (e.g., Figure 36–39 in SLES229) show recommended configurations using REG103xA-A regulators.
Is the PCM2900BDB pin-compatible with the PCM2902BDB?
Yes, the PCM2900BDB is pin-compatible with the PCM2902BDB in the SSOP-28 (DB) package. Both share identical pin numbering, power domains, USB interface, analog I/O, HID controls, and clock inputs. The only difference is that PCM2902BDB replaces TEST0/TEST1 pins (24/25) with DIN/DOUT for S/PDIF, while PCM2900BDB retains those test pins-making them mechanically interchangeable but functionally distinct where S/PDIF is required.
PCM2900BDB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Bulk
- Product Status:
- Not For New Designs
- Type:
- Stereo Audio
- Data Interface:
- USB
- Resolution (Bits):
- 8 b
- Number of ADCs / DACs:
- 1 / 1
- 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
PCM2900BDB FAQ
1.How can I place an order for PCM2900BDB through Aetrix?
Please submit a Request for Quotation (RFQ) for PCM2900BDB 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 PCM2900BDB reliable?
The price and inventory of PCM2900BDB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCM2900BDB is usually 5 days.
3.What payment methods are accepted for PCM2900BDB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCM2900BDB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCM2900BDB?
PCM2900BDB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCM2900BDB 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 PCM2900BDB?
For technical support, including PCM2900BDB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCM2900BDB requirements.
6.How does Aetrix verify that PCM2900BDB is sourced from the original manufacturer or authorized distributors?
All PCM2900BDB 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 PCM2900BDB meets industry standards.
7.What is the process for return or replacement of PCM2900BDB?
All PCM2900BDB units undergo pre-shipment inspection (PSI). If there is an issue with PCM2900BDB, 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 PCM2900BDB part is unused and in its original packaging.
Return procedure for PCM2900BDB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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