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Texas Instruments LM4549BVH/NOPB
- Part No.:
- LM4549BVH/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
LM4549BVH/NOPB.pdf
- Description:
- IC AUDIO CODEC 2MULTICH 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,550
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Product details
Overview
LM4549BVH/NOPB from Texas Instruments is a dual-channel AC '97 Rev 2.1 audio codec IC performing analog-to-digital and digital-to-analog conversion with independent sample rate control (4–48 kHz in 1-Hz steps), 18-bit sigma-delta architecture, 90 dB ADC dynamic range, and integrated stereo/mono analog mixers for PC audio systems.
For engineers reviewing the LM4549BVH/NOPB datasheet, LM4549BVH/NOPB pinout, LM4549BVH/NOPB application, or LM4549BVH/NOPB equivalent, key selection considerations include AC Link interface timing compliance, TI 3D Sound stereo enhancement enablement, EAPD-controlled external amplifier power-down sequencing, and multi-input mixer gain/attenuation register mapping (e.g., 02h Master Volume, 0Eh Mic Volume).
Technical Context
The LM4549BVH/NOPB implements a fully AC '97 Rev 2.1–compliant digital interface with BIT_CLK, SYNC, SDATA_IN, and SDATA_OUT signals supporting deterministic frame-based audio streaming. Its analog signal path includes two 18-bit sigma-delta ADCs and DACs, each with dedicated programmable gain amplifiers, mute/attenuation controls per input channel, and configurable stereo/mono mixing at MIX1 and MIX2.
Sample rate conversion is implemented via independent PLL-based clock generation for ADC and DAC paths, enabling asynchronous operation between host controller and audio sampling - critical for jitter-sensitive playback and recording in PCI/AMR/MDC-based PC platforms. The device supports up to 8 simultaneous input streams in Extended AC Link mode and integrates TI's fixed-depth 3D Sound enhancement circuitry controlled by bit D13 in register 20h.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| DAC Resolution | 18-bit sigma-delta; enables 89 dB typical dynamic range for high-fidelity playback |
| ADC Resolution | 18-bit sigma-delta; delivers 90 dB typical dynamic range for low-noise recording |
| Sample Rate Range | 4 kHz to 48 kHz in 1-Hz increments; allows precise matching to legacy and modern audio sources |
| Analog Mixer Dynamic Range | 97 dB typical; ensures minimal degradation when combining multiple inputs (LINE_IN, MIC1, CD, etc.) |
| Power Supply Options | Digital: 3.3 V or 5 V; Analog: 4.2–5.5 V; supports mixed-voltage motherboard designs |
| Operating Temperature | −40°C to +85°C; qualified for industrial and extended-temperature PC/embedded deployments |
| AC Link Interface | Compliant with AC '97 Rev 2.1; supports primary/secondary codec configuration via ID0#/ID1# pins |
Pinout & Package
LM4549BVH/NOPB is housed in a 48-pin LQFP package (7.00 mm × 7.00 mm) with exposed thermal pad. Pin functions are defined per TI SNAS598B Rev B datasheet, including dual analog supply domains (AVDD/AVSS, DVDD1/DVDD2/DVSS1/DVSS2), AC Link I/O (BIT_CLK, SYNC, SDATA_IN, SDATA_OUT), and dedicated analog I/O for line/mic/video/CD/phone inputs and line-level/mono outputs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LINE_OUT_L / LINE_OUT_R | Stereo line output drivers | 1 Vrms nominal outputs with 0 dB to −46.5 dB attenuation (1.5 dB steps) via Master Volume register 02h |
| LNLVL_OUT_L / LNLVL_OUT_R | Secondary stereo line outputs | Independent volume control (register 04h) for alternate audio routing or monitoring paths |
| MONO_OUT | Mono line output | Configurable to sum stereo channels or route boosted MIC1/MIC2; volume controlled by register 06h |
| MIC1 / MIC2 | Microphone inputs | Each supports 0 dB or 20 dB programmable boost (register 0Eh); selectable to left/right ADC or mono mixer |
| EAPD | External amplifier power-down | Active-high logic output (DVDD-referenced) to disable external power amp; default = low (enabled) |
| ID0# / ID1# | Codec identity select | Inverted logic inputs determining primary/secondary role in multi-codec AC Link systems (registers 28h) |
| RESET# | Hardware cold reset | Active-low signal initializing all registers and enabling PC_BEEP passthrough to LINE_OUT during boot |
| XTL_IN / XTL_OUT | 24.576 MHz crystal oscillator interface | Primary mode only; supports fundamental-mode crystal or external oscillator; unused in secondary mode |
Key Features
| Feature | Design Value |
|---|---|
| AC '97 Rev 2.1 Compliance | Fully implements AC Link protocol timing, frame structure, and register map - eliminates need for custom controller firmware adaptation |
| TI 3D Sound Enhancement | Fixed-depth stereo widening circuit (enabled via D13 in reg 20h); requires 0.022 µF capacitor between 3DP/3DN pins |
| PC_BEEP Passthrough | Hardware-bypass of PC speaker tone directly to LINE_OUT during Cold Reset - ensures audible POST beeps before driver initialization |
| Multi-Source Analog Mixer | Eight analog inputs (LINE_IN, AUX, CD, VIDEO, PHONE, MIC1, MIC2, PC_BEEP) routed to stereo/mono outputs with independent gain/attenuation/mute per source |
| Extended Temperature Operation | Validated for −40°C to +85°C ambient; suitable for industrial PCs, automotive telematics, and embedded media gateways |
Applications
| Desktop PC Audio Systems | Portable PC Audio Systems |
|---|---|
Use Scenario: Integrated audio subsystem on AMR/PCI motherboard or add-in card delivering Windows-compatible sound I/O. IC Role / Device Role / Timing Role: Primary AC '97 codec handling full-duplex stereo ADC/DAC conversion, mixer routing, and AC Link framing. Use Value: Eliminates discrete op-amp and filter components while providing 90 dB SNR and deterministic sample timing for real-time audio processing. | Use Scenario: Audio front-end on MDC cards or chipset-integrated solutions for laptops and compact form-factor PCs. IC Role / Device Role / Timing Role: Secondary codec in multi-codec AC Link topology supporting simultaneous voice+music streams. Use Value: Enables concurrent microphone capture and speaker playback without CPU scheduling conflicts due to independent ADC/DAC sample rate control. |
| Automotive Telematics | General Multichannel Audio Systems |
Use Scenario: Voice interface module in vehicle infotainment systems requiring hands-free calling and voice command recognition. IC Role / Device Role / Timing Role: Analog front-end for microphone preamplification, echo cancellation reference path, and line-level output to cabin speakers. Use Value: 20 dB mic boost and 97 dB mixer dynamic range preserve speech clarity in noisy cabin environments. | Use Scenario: Audio processing node in industrial media players or kiosk systems needing flexible input routing and volume management. IC Role / Device Role / Timing Role: Central mixer and converter for aggregating CD, line, video, and phone inputs into unified stereo/mono outputs. Use Value: Hardware-based analog mixing avoids DSP resource consumption and guarantees zero-latency signal combination. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4550B | Supports up to 6-channel output frames (vs. 2 on LM4549BVH/NOPB); lacks TI 3D Sound circuitry; identical pinout and register map | Better suited for multi-stream broadcast or surround-sound output where 3D enhancement is unnecessary | Select LM4550B when higher output channel count is required and stereo widening is not needed |
| AD1885 | AC '97 Rev 2.1 compliant; 16-bit converters (vs. 18-bit); 85 dB ADC dynamic range; different register addressing and pin assignment | Targeted at cost-sensitive desktop audio where 90 dB SNR is not mandatory | Choose AD1885 only if legacy driver compatibility and lower BOM cost outweigh resolution and noise performance requirements |
Compared with LM4549BVH/NOPB, LM4550B offers expanded output bandwidth but removes 3D audio capability, while AD1885 trades resolution and dynamic range for lower integration and cost - making LM4549BVH/NOPB optimal for applications demanding high-SNR, feature-rich PC audio with hardware-accelerated stereo enhancement.
Availability
LM4549BVH/NOPB is available at Aetrix Electronics and suitable for desktop PC audio systems, portable PC audio subsystems, and automotive telematics applications requiring stable component supply, long-lifecycle support, and AC '97 Rev 2.1 compliance.
Supply support for LM4549BVH/NOPB 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 leadership in audio, power management, and industrial signal chain solutions.
The LM4549BVH/NOPB belongs to TI's AC '97 audio codec product line, designed specifically to deliver high-fidelity, low-jitter PC audio subsystems with integrated analog mixing, sample rate conversion, and system-level power management features.
FAQ
What is the maximum supported sample rate for the LM4549BVH/NOPB DAC and ADC?
The LM4549BVH/NOPB supports independent DAC and ADC sample rates from 4 kHz to 48 kHz in 1-Hz increments. This range is programmable via internal PLL configuration registers and enables precise synchronization with diverse audio sources such as CD players (44.1 kHz), telephony (8 kHz), and professional audio equipment (48 kHz). The LM4549BVH/NOPB achieves deterministic timing for both conversion paths, ensuring jitter-free operation in real-time PC audio applications.
Does the LM4549BVH/NOPB support multiple codecs on a single AC Link bus?
Yes, the LM4549BVH/NOPB supports multi-codec configurations using Extended AC Link. Codec identity is set via ID0# and ID1# pins, allowing one primary and up to three secondary codecs on the same bus. In this topology, the LM4549BVH/NOPB can receive up to 2 streams in Output Frames and transmit up to 8 streams in Input Frames. This capability enables complex audio architectures like simultaneous voice capture and music playback in notebook PCs.
How does the TI 3D Sound feature work on the LM4549BVH/NOPB?
The TI 3D Sound feature on the LM4549BVH/NOPB is a fixed-depth stereo enhancement circuit activated by bit D13 in register 20h. It operates on the stereo mix path at MIX1 and requires a 0.022 µF capacitor between pins 3DP and 3DN. Unlike software-based solutions, it introduces no latency or CPU overhead. When enabled, it widens the stereo image without altering frequency response - making LM4549BVH/NOPB suitable for immersive PC gaming and multimedia playback where hardware acceleration is preferred.
What is the purpose of the EAPD pin on the LM4549BVH/NOPB?
The EAPD (External Amplifier Power Down) pin on the LM4549BVH/NOPB is an active-high digital output that controls the shutdown state of an external power amplifier. Controlled by bit D15 in register 26h, its default state is low (amplifier enabled). During system suspend or mute events, asserting EAPD reduces system power consumption by disabling the amplifier stage. This function is essential for meeting ACPI power state requirements in modern PC platforms using the LM4549BVH/NOPB.
Can the LM4549BVH/NOPB operate with both 3.3-V and 5-V digital supplies?
Yes, the LM4549BVH/NOPB supports dual digital supply options: DVDD1 and DVDD2 accept either 3.3 V or 5 V, allowing direct interfacing with legacy 5-V or modern 3.3-V host controllers. Analog supply AVDD requires 4.2–5.5 V. This flexibility simplifies design migration across motherboard generations and ensures compatibility with PCI, AMR, and MDC form factors. The LM4549BVH/NOPB maintains full AC '97 Rev 2.1 timing compliance under both voltage conditions.
LM4549BVH/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- Audio, AC '97
- Data Interface:
- Serial
- Resolution (Bits):
- 18 b
- Number of ADCs / DACs:
- 2 / 2
- Sigma Delta:
- Yes
- S/N Ratio, ADCs / DACs (db) Typ:
- -
- Dynamic Range, ADCs / DACs (db) Typ:
- 90 / 89
- Voltage - Supply, Analog:
- 4.2V ~ 5.5V
- Voltage - Supply, Digital:
- 3.3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
LM4549BVH/NOPB FAQ
1.How can I place an order for LM4549BVH/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4549BVH/NOPB 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 LM4549BVH/NOPB reliable?
The price and inventory of LM4549BVH/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4549BVH/NOPB is usually 5 days.
3.What payment methods are accepted for LM4549BVH/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4549BVH/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4549BVH/NOPB?
LM4549BVH/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4549BVH/NOPB 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 LM4549BVH/NOPB?
For technical support, including LM4549BVH/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4549BVH/NOPB requirements.
6.How does Aetrix verify that LM4549BVH/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4549BVH/NOPB 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 LM4549BVH/NOPB meets industry standards.
7.What is the process for return or replacement of LM4549BVH/NOPB?
All LM4549BVH/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4549BVH/NOPB, 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 LM4549BVH/NOPB part is unused and in its original packaging.
Return procedure for LM4549BVH/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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