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Texas Instruments LM4550BVHX
- Part No.:
- LM4550BVHX
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
LM4550BVHX.pdf
- Description:
- IC AUDIO CODEC 2MULTICH 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,266
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Product details
Overview
LM4550BVHX from Texas Instruments is an AC '97 Rev 2.1–compliant multi-channel audio codec with integrated stereo headphone amplifier, 18-bit sigma-delta ADCs/DACs, sample rate conversion (4 kHz to 48 kHz in 1 Hz steps), TI 3D Sound enhancement, and EAPD control - designed for PC audio systems requiring full-duplex analog I/O, mixer flexibility, and deterministic timing.
For engineers reviewing the LM4550BVHX datasheet, LM4550BVHX pinout, LM4550BVHX application, or LM4550BVHX equivalent, key selection considerations include its dual-supply operation (3.3 V/5 V digital, 4.2–5.5 V analog), 48-pin LQFP package, 90 dB ADC dynamic range, stereo headphone output with 0.02% THD+N at 50 mW into 32 Ω, and support for TI's codec chaining architecture.
Technical Context
The LM4550BVHX implements a fully AC Link–compatible interface with BIT_CLK (12.288 MHz), SYNC (48 kHz frame marker), SDATA_IN (codec-to-controller PCM/status), and SDATA_OUT (controller-to-codec PCM/control). It uses separate 18-bit sigma-delta converters for ADC and DAC paths, each with A-weighted dynamic range ≥90 dB and THD+N ≤0.02% at rated headphone load.
Its analog signal chain includes programmable gain mixers (MIX1/MIX2) supporting up to eight analog inputs (CD_L/R, LINE_IN_L/R, AUX_L/R, VIDEO_L/R, PHONE, PC_BEEP, MIC1/MIC2), dual stereo outputs (LINE_OUT_L/R, HP_OUT_L/R), mono output (MONO_OUT), and TI 3D Sound circuitry (3DP/3DN pins). Sample timing is deterministic, enabling precise software task scheduling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 18-bit sigma-delta; enables high-fidelity digitization of microphone and line inputs with ≥90 dB dynamic range. |
| DAC Resolution | 18-bit sigma-delta; delivers low-noise playback with 89 dB typical dynamic range and 0.02% THD+N into 32 Ω headphones. |
| Sample Rate Range | 4 kHz to 48 kHz in 1 Hz increments; supports flexible clocking for legacy and modern audio sources without external SRC hardware. |
| Analog Supply Range | 4.2 V to 5.5 V; accommodates standard 5 V analog rails while maintaining PSRR ≥40 dB for noise immunity. |
| Digital Supply Options | 3.3 V or 5 V DVDD; allows direct interfacing with both 3.3 V controllers and legacy 5 V PCI/AMR bus logic. |
| Operating Temperature | −40°C to +85°C; qualified for industrial and extended-temperature PC motherboard, MDC, and telematics applications. |
| Headphone Drive | Capable of 50 mW into 32 Ω; eliminates need for external headphone amplifiers in compact desktop and portable PC designs. |
Pinout & Package
LM4550BVHX is housed in a 48-pin LQFP package (7.00 mm × 7.00 mm), thermally optimized with RθJA = 74°C/W and designed for surface-mount reflow assembly on standard PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| HP_OUT_L / HP_OUT_R | Stereo headphone output drivers | Direct-drive 32 Ω loads with independent 0 dB to –46.5 dB volume control (1.5 dB steps); enable zero-latency local audio playback. |
| LINE_OUT_L / LINE_OUT_R | Stereo line-level outputs | 1 Vrms nominal outputs with master volume control; feed powered speakers or downstream audio processors. |
| MIC1 / MIC2 | Programmable mono microphone inputs | Support 0 dB or 20 dB boost gain; selectable by MS bit in General Purpose register (20h) for flexible mic biasing and SNR optimization. |
| SDATA_IN / SDATA_OUT | AC Link serial data I/O | Controller-facing bidirectional PCM/data interface synchronized to BIT_CLK; supports primary/secondary codec modes and TI chaining. |
| ID0# / ID1# | Codec identity configuration | Inverted logic inputs setting Primary/Secondary mode; determine address in multi-codec AC Link systems and enable daisy-chained topologies. |
| EAPD | External amplifier power-down | Active-high logic output controlling shutdown of external power amps; ensures mute-on-power-up and clean system-level power sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| TI 3D Sound enhancement | Fixed-depth stereo widening via 3DP/3DN RC network; improves perceived spatial imaging without DSP overhead or latency penalty. |
| Chaining capability | Single SDATA_IN pin shared across multiple LM4550BVHX devices using CIN input; reduces controller pin count and simplifies multi-channel surround sound implementations. |
| PC Beep passthrough | Hardware-bypass path from PC_BEEP input to LINE_OUT during Cold Reset; guarantees audible POST tones before firmware initialization. |
| Extended temperature range | −40°C to +85°C operation; validated for use in automotive telematics, industrial PCs, and embedded systems outside consumer thermal envelopes. |
| Multi-input analog mixer | Eight configurable analog inputs (CD, LINE_IN, AUX, VIDEO, PHONE, MIC1/2, PC_BEEP) with per-source gain/mute; enables flexible audio routing without external op-amps. |
Applications
| Desktop PC Audio Systems | Portable PC Audio (MDC Cards) |
|---|---|
Use Scenario: Integrated audio subsystem on PCI or AMR add-in cards with AC Link–enabled chipset. IC Role / Device Role / Timing Role: Primary AC '97 codec handling all analog I/O, sample rate conversion, and mixer functions under AC Link protocol timing. Use Value: Eliminates need for discrete ADC/DAC/mixer components; reduces BOM cost and board area while ensuring PC99 compliance. | Use Scenario: Compact audio solution on Mobile Daughter Card (MDC) in notebook platforms. IC Role / Device Role / Timing Role: Secondary codec in chained configuration, sharing SDATA_IN with primary controller to minimize interconnect complexity. Use Value: Enables 6-channel DAC output (e.g., 5.1 surround) using two LM4550BVHX devices without additional serial data lines. |
| Automotive Telematics HMI | Industrial Embedded Audio Terminals |
Use Scenario: Voice-enabled infotainment unit with hands-free calling, voice prompts, and emergency alert tones. IC Role / Device Role / Timing Role: Full-duplex audio codec providing simultaneous MIC input capture and LINE_OUT/HP_OUT playback with deterministic sample timing. Use Value: −40°C to +85°C rating and EAPD control ensure reliable operation in vehicle cabin environments and seamless integration with external Class D amplifiers. | Use Scenario: Ruggedized kiosk or medical device requiring local audio feedback, microphone monitoring, and line-level recording. IC Role / Device Role / Timing Role: Standalone audio interface with programmable gain mic inputs, headphone monitoring, and mono output for speaker alerts. Use Value: On-chip 20 dB mic boost and 90 dB ADC dynamic range support low-SNR environments; VREF_OUT (2.2 V, 5 mA) powers electret microphones directly. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4550B | Same die, identical electrical specs and pinout; LM4550BVHX is the tape-and-reel variant of LM4550B. | No functional difference; both meet AC '97 Rev 2.1 and support TI 3D Sound, chaining, and EAPD. | Select LM4550BVHX for automated SMT production; LM4550B may be offered in tray or different packaging formats. |
| ALC262 | Realtek AC '97 codec with 20-bit ADC/DAC, higher integration (integrated jack sensing), but no TI 3D Sound or chaining support. | Lacks codec-to-codec chaining and deterministic sample timing; requires different driver stack and register mapping. | Choose ALC262 only when jack detection and lower-cost licensing are prioritized over TI-specific features and timing determinism. |
Compared with LM4550B and ALC262, the LM4550BVHX provides identical core functionality to LM4550B (same silicon, same performance), while offering superior system-level flexibility through TI's chaining architecture and guaranteed deterministic timing - critical for real-time audio processing in multi-codec or telematics applications.
Availability
LM4550BVHX is available at Aetrix Electronics and suitable for desktop PC audio systems, portable PC MDC cards, automotive telematics interfaces, and industrial embedded terminals requiring stable component supply, long-lifecycle support, and AC '97 Rev 2.1 compliance.
Supply support for LM4550BVHX 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 decades of audio codec design expertise.
The LM4550BVHX belongs to TI's AC '97 audio codec product line, engineered specifically for PC99-compliant audio subsystems requiring high-fidelity analog I/O, flexible mixer topology, and robust AC Link interoperability in desktop, portable, and automotive platforms.
FAQ
What is the function of the CIN pin on the LM4550BVHX?
The CIN pin on the LM4550BVHX enables TI's proprietary codec chaining feature. When configured via the Chain-In Control register (74h), it allows the device to pass through SDATA_IN from another codec instead of driving its own, reducing controller pin count in multi-codec systems. In single-codec use, CIN should be grounded or left open with chaining disabled.
Does the LM4550BVHX support both 3.3 V and 5 V digital supplies?
Yes, the LM4550BVHX supports dual digital supply options: DVDD1 and DVDD2 accept either 3.3 V or 5 V, allowing direct compatibility with both modern 3.3 V AC Link controllers and legacy 5 V PCI/AMR bus implementations without level-shifting circuitry.
How does the TI 3D Sound feature work on the LM4550BVHX?
The TI 3D Sound feature on the LM4550BVHX is implemented via external 0.022 µF capacitor between pins 3DP and 3DN, creating a fixed-depth stereo enhancement circuit. It is enabled/disabled via bit D13 in the General Purpose register (20h); the 3D Control register (22h) is read-only and non-programmable.
What is the purpose of the HP_OUT_C pin on the LM4550BVHX?
The HP_OUT_C pin on the LM4550BVHX serves as the AC ground reference for the headphone outputs HP_OUT_L and HP_OUT_R. It must be capacitively coupled to analog ground with short traces to maximize PSRR and minimize crosstalk; it is not a DC ground and cannot sink/source current.
Can the LM4550BVHX operate in secondary codec mode without an external crystal?
Yes, the LM4550BVHX can operate in secondary codec mode without an external crystal: XTL_IN and XTL_OUT pins may be left unconnected (NC) when the device receives BIT_CLK from a primary codec. The internal oscillator is disabled in secondary mode, eliminating crystal BOM and layout overhead.
LM4550BVHX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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 FAQ
1.How can I place an order for LM4550BVHX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4550BVHX 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 reliable?
The price and inventory of LM4550BVHX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4550BVHX is usually 5 days.
3.What payment methods are accepted for LM4550BVHX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4550BVHX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4550BVHX?
LM4550BVHX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4550BVHX 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?
For technical support, including LM4550BVHX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4550BVHX requirements.
6.How does Aetrix verify that LM4550BVHX is sourced from the original manufacturer or authorized distributors?
All LM4550BVHX 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 meets industry standards.
7.What is the process for return or replacement of LM4550BVHX?
All LM4550BVHX units undergo pre-shipment inspection (PSI). If there is an issue with LM4550BVHX, 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 part is unused and in its original packaging.
Return procedure for LM4550BVHX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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