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Texas Instruments LM4550BVHX/S5001320
- Part No.:
- LM4550BVHX/S5001320
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
LM4550BVHX/S5001320.pdf
- Description:
- AC 97 REV 2.1 MULTI-CHAN AUD COD
- Quantity:
- Payment:
- Shipping:
Inventory:2,000
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Product details
Overview
LM4550BVHX/S5001320 from Texas Instruments is an AC '97 Rev 2.1–compliant multi-channel audio codec IC featuring dual 18-bit sigma-delta ADCs and DACs, stereo headphone amplifier with independent gain control, TI 3D Sound stereo enhancement, and sample rate conversion from 4 kHz to 48 kHz in 1 Hz steps. It delivers 90 dB ADC dynamic range, 89 dB DAC dynamic range, and supports up to 6 DAC channels in multi-codec systems for PC audio subsystems.
For engineers reviewing the LM4550BVHX/S5001320 datasheet, LM4550BVHX/S5001320 pinout, LM4550BVHX/S5001320 application, or LM4550BVHX/S5001320 equivalent, key selection considerations include AC Link interface timing compliance, analog mixer routing flexibility (8 ADC inputs, 4 stereo/4 mono), EAPD-controlled external amplifier power-down, and TI's unique codec chaining capability for surround sound expansion.
Technical Context
The LM4550BVHX/S5001320 implements a full AC '97 Rev 2.1 architecture with deterministic sample timing: ADC sampling and DAC request timing are fully synchronized to BIT_CLK, enabling predictable task scheduling in real-time audio stacks. Its analog front-end integrates programmable boost amplifiers for MIC1/MIC2 (0 dB or 20 dB gain), independent volume controls per input channel (1.5 dB steps), and dual-stage mixing (MIX1 for 3D-enhanced signals, MIX2 for final stereo/mono outputs).
Digital operation supports dual supply domains: 3.3 V or 5 V for DVDD, and 4.2–5.5 V for AVDD. The device operates across −40°C to +85°C, includes hardware Cold Reset (active-low RESET#) that routes PC_BEEP directly to LINE_OUT during initialization, and features TI's chaining function-using CIN and SDATA_IN to daisy-chain multiple codecs on a single controller SDATA_IN line without additional serial data pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 18-bit sigma-delta - enables 90 dB typical dynamic range for high-fidelity recording paths. |
| DAC Resolution | 18-bit sigma-delta - delivers 89 dB typical dynamic range for clean playback output. |
| Sample Rate Conversion | 4 kHz to 48 kHz in 1 Hz increments - allows precise clock domain bridging between non-synchronous sources (e.g., USB audio, video sync). |
| Headphone Amp THD+N | 0.02% at 50 mW into 32Ω - ensures low-distortion local listening without external amplification. |
| Analog Mixer Dynamic Range | 97 dB typical - preserves signal integrity across complex multi-source mixing (CD, LINE_IN, MIC, VIDEO, AUX). |
| Operating Temperature | −40°C to +85°C - supports industrial and extended-temperature embedded audio applications beyond consumer PC use. |
| Power Supply Options | Digital: 3.3 V or 5 V; Analog: 4.2–5.5 V - accommodates legacy 5 V and modern low-voltage digital logic while maintaining analog SNR. |
Pinout & Package
LM4550BVHX/S5001320 is housed in a 48-pin LQFP package (7.00 mm × 7.00 mm), thermally rated at 74°C/W junction-to-ambient resistance. Pin functions are validated per TI SNAS276G datasheet Rev G (September 2015).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| RESET# (Pin 11) | Active-low hardware reset | Forces cold reset: clears registers, disables test modes, and routes PC_BEEP directly to LINE_OUT before firmware initialization. |
| BIT_CLK (Pin 6) | AC Link bit clock I/O | Outputs 12.288 MHz in Primary mode; inputs clock in Secondary mode - defines frame timing and sampling edges (SDATA_OUT sampled on rising edge, SDATA_IN on falling edge). |
| SDATA_IN (Pin 8) | AC Link input frame output | Transmits ADC PCM data and status frames to controller; supports TI chaining when driven by upstream codec via CIN. |
| HP_OUT_L / HP_OUT_R (Pins 39, 41) | Stereo headphone driver outputs | Each provides 50 mW into 32Ω with independent 1.5 dB-step volume control (0 dB to –46.5 dB) and mute. |
| VREF_OUT (Pin 28) | Bias reference output | Supplies up to 5 mA - used to bias electret microphones directly, eliminating need for external bias circuitry. |
| EAPD (Pin 47) | External amplifier power-down | Logic-level output controlled by register bit D15 - drives shutdown pin of external Class-D or AB power amps to reduce system standby power. |
Key Features
| Feature | Design Value |
|---|---|
| TI 3D Sound stereo enhancement | Fixed-depth spatial processing enabled via register bit D13; uses dedicated 3DP/3DN pins with 0.022 µF capacitor - adds perceptual width without DSP overhead. |
| Codec chaining capability | Single SDATA_IN pin shared across multiple LM4550Bs using CIN input and Chain-In Control register (74h) - enables 6-channel DAC/8-channel ADC systems without extra controller pins. |
| Programmable microphone boost | MIC1/MIC2 selectable via MS bit (D8); 0 dB or 20 dB gain set by 20dB bit (D6) - supports both line-level and electret mic inputs with matched SNR performance. |
| Dual analog supply domains | Separate AVDD1/AVDD2 and AVSS1/AVSS2 - isolates sensitive analog sections (ADC/DAC/HP amp) from noisy digital supplies (DVDD1/DVDD2), improving PSRR to 40 dB. |
| PC_BEEP passthrough | Hardware-routed during Cold Reset - bypasses all volume/mute controls to deliver BIOS POST tones directly to LINE_OUT, ensuring audible diagnostics before OS load. |
Applications
| Desktop PC Audio Subsystem | Portable PC MDC Audio |
|---|---|
Use Scenario: Integrated audio on PCI or AMR add-in cards with AC Link–capable chipset. IC Role / Device Role / Timing Role: Primary AC '97 codec handling full-duplex stereo ADC/DAC, analog mixing, and headphone drive. Use Value: Eliminates need for discrete op-amps and level-shifters; 90 dB ADC DR captures clean microphone input even in electrically noisy motherboard environments. |
Use Scenario: Compact audio solution on Mobile Daughter Card (MDC) with space-constrained layout. IC Role / Device Role / Timing Role: Secondary codec in chained configuration, sharing controller SDATA_IN via CIN to expand DAC count to 6 channels. Use Value: Reduces BOM count and PCB area versus dual standalone codecs; maintains deterministic AC Link timing for low-latency voice/video playback. |
| Automotive Telematics Head Unit | Industrial Embedded Audio Recorder |
Use Scenario: In-vehicle infotainment system requiring hands-free calling, Bluetooth audio passthrough, and voice prompt playback. IC Role / Device Role / Timing Role: Audio interface between baseband processor and analog audio jacks (MIC, LINE_IN, HP_OUT), leveraging TI 3D Sound for cabin-wide audio dispersion. Use Value: Extended −40°C to +85°C operation ensures reliability under hood temperature cycling; EAPD control enables automatic power-down of external amp during sleep mode. |
Use Scenario: Ruggedized field recorder capturing multi-source analog inputs (LINE_IN, MIC1, CD, VIDEO) with timestamped digital output. IC Role / Device Role / Timing Role: High-SNR analog front-end with 8 configurable ADC inputs, independent gain/attenuation per channel, and A-weighted 90 dB DR for archival-quality capture. Use Value: On-chip analog mixing and sample rate conversion allow synchronous recording from asynchronous sensors (e.g., 44.1 kHz audio + 48 kHz video sync) without external resampling FPGA. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multi-channel AC '97 audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD1981B (Analog Devices) | AC '97 Rev 2.2 compliant; 20-bit ADC/DAC; integrated jack detection; no TI 3D Sound or chaining. | Targets premium notebook audio with auto-jack sensing; lacks codec daisy-chaining for surround expansion. | Preferred where jack detection and higher-resolution conversion outweigh need for TI-specific features. |
| ALC655 (Realtek) | AC '97 Rev 2.1 compliant; lower cost; 16-bit ADC/DAC; 85 dB DR; no external EAPD control or VREF_OUT. | Used in budget desktop motherboards; limited analog feature set and thermal rating (0°C to +70°C only). | Selected for cost-sensitive consumer PC designs where extended temp range and microphone biasing are not required. |
Compared with AD1981B and ALC655, LM4550BVHX/S5001320 uniquely combines industrial temperature support, TI-specific chaining for scalable channel count, and integrated VREF_OUT for electret mic biasing - making it optimal for embedded and automotive systems requiring robust analog integration and expansion headroom.
Availability
LM4550BVHX/S5001320 is available at Aetrix Electronics and suitable for desktop PC audio subsystems, portable MDC-based systems, automotive telematics head units, and industrial embedded recorders requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM4550BVHX/S5001320 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity technologies with over 90 years of innovation in signal chain and power management solutions.
The LM4550B belongs to TI's PC audio codec product line, designed specifically to meet AC '97 Rev 2.1 compliance while delivering high-fidelity analog performance, flexible mixer routing, and system-level features like EAPD control and TI 3D Sound for PC99-compliant and industrial audio applications.
FAQ
What AC '97 revision does LM4550BVHX/S5001320 comply with?
LM4550BVHX/S5001320 is fully compliant with AC '97 Revision 2.1, as confirmed in its official datasheet SNAS276G. It supports all mandatory AC Link timing requirements, register map definitions, and functional modes specified in that revision-including primary/secondary codec identity via ID0#/ID1#, SYNC frame alignment, and SDATA_IN/SDATA_OUT frame structure. It does not implement optional Rev 2.2 features such as jack detection or enhanced power management states.
Does LM4550BVHX/S5001320 support sample rate conversion between different input and output rates?
Yes, LM4550BVHX/S5001320 supports independent sample rate conversion for ADC and DAC paths, ranging from 4 kHz to 48 kHz in precise 1 Hz increments. This allows simultaneous operation at mismatched rates-for example, recording at 44.1 kHz while playing back at 48 kHz-without external resampling hardware. The conversion is implemented in dedicated digital blocks with deterministic latency, critical for real-time audio applications.
How is the TI 3D Sound feature implemented in LM4550BVHX/S5001320?
LM4550BVHX/S5001320 implements TI 3D Sound using a fixed-depth stereo enhancement circuit accessed via dedicated pins 3DP and 3DN. A 0.022 µF capacitor must be placed between them, and the feature is enabled/disabled via bit D13 in the General Purpose register (20h). Unlike programmable 3D engines, this is a hardware-based, zero-latency analog post-processing stage applied to the MIX1 signal path before final mixing, requiring no host CPU intervention.
Can LM4550BVHX/S5001320 operate with only a 3.3-V digital supply?
Yes, LM4550BVHX/S5001320 supports 3.3-V digital operation (DVDD = 3.3 V) as specified in its Recommended Operating Conditions. At this voltage, digital quiescent supply current is 19 mA. The analog supply (AVDD) remains independent and must be 4.2–5.5 V to maintain 90 dB ADC dynamic range and 89 dB DAC dynamic range. Mixing 3.3-V digital and 5-V analog supplies is standard practice and validated in TI's reference designs.
What is the purpose of the CIN pin on LM4550BVHX/S5001320?
The CIN pin (Pin 48) on LM4550BVHX/S5001320 enables TI's proprietary codec chaining function. When configured via the Chain-In Control register (74h), the device disconnects its internal SDATA_IN driver and instead passes through the signal received on CIN to its SDATA_IN output pin-allowing multiple LM4550Bs to share a single controller SDATA_IN line. This supports scalable multi-channel audio (e.g., 6 DAC channels) without increasing controller pin count or breaking AC Link timing.
LM4550BVHX/S5001320 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Bulk
- 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:
- 3V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 48-LQFP (7x7)
LM4550BVHX/S5001320 FAQ
1.How can I place an order for LM4550BVHX/S5001320 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4550BVHX/S5001320 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 LM4550BVHX/S5001320 reliable?
The price and inventory of LM4550BVHX/S5001320 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4550BVHX/S5001320 is usually 5 days.
3.What payment methods are accepted for LM4550BVHX/S5001320?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4550BVHX/S5001320 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4550BVHX/S5001320?
LM4550BVHX/S5001320 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4550BVHX/S5001320 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 LM4550BVHX/S5001320?
For technical support, including LM4550BVHX/S5001320 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4550BVHX/S5001320 requirements.
6.How does Aetrix verify that LM4550BVHX/S5001320 is sourced from the original manufacturer or authorized distributors?
All LM4550BVHX/S5001320 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 LM4550BVHX/S5001320 meets industry standards.
7.What is the process for return or replacement of LM4550BVHX/S5001320?
All LM4550BVHX/S5001320 units undergo pre-shipment inspection (PSI). If there is an issue with LM4550BVHX/S5001320, 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 LM4550BVHX/S5001320 part is unused and in its original packaging.
Return procedure for LM4550BVHX/S5001320:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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