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Texas Instruments LM4546BVH
- Part No.:
- LM4546BVH
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
LM4546BVH.pdf
- Description:
- IC AUDIO CODEC 2MULTICH 48-LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,080
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Product details
Overview
LM4546BVH from Texas Instruments is an AC '97 Rev 2.1–compliant multi-channel audio codec featuring dual 18-bit sigma-delta ADCs and DACs, integrated analog mixers with independent gain/attenuation/mute per input, Texas Instruments' 3D Sound stereo enhancement, and programmable 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 desktop PC audio systems on PCI/AMR cards or motherboards with AC Link interface.
For engineers reviewing the LM4546BVH datasheet, LM4546BVH pinout, LM4546BVH application, or LM4546BVH equivalent, this device is selected for high-fidelity PC audio subsystems requiring deterministic sample timing, extended temperature operation (−40°C to +85°C), dual-supply flexibility (3.3 V/5 V digital, 4.2–5.5 V analog), and multi-codec AC Link expansion up to 8 streaming channels.
Technical Context
The LM4546BVH implements a fully AC '97 Rev 2.1–compliant digital 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). Its analog signal path includes three stereo analog inputs (LINE_IN, CD, AUX), two mono inputs (MIC1/MIC2 with 0 dB/20 dB programmable boost), and dual stereo outputs (LINE_OUT_L/R) plus MONO_OUT.
It integrates two independent sample rate converters - one for ADCs (32-bit resolution), one for DACs (6-bit resolution) - enabling asynchronous conversion between any rates from 4 kHz to 48 kHz. The analog mixer supports deterministic latency paths, with all mixer inputs routed through dedicated volume registers (e.g., 0Eh for MIC, 10h for LINE_IN) and mute controls tied to register bits D7/D6.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Analog Supply Range | 4.2 V to 5.5 V - powers ADC/DAC reference and analog mixers; requires stable low-noise regulation |
| Digital Supply Options | 3.3 V or 5 V - supports legacy and modern motherboard power domains; DVDD1/DVDD2 pins allow split supply routing |
| ADC Resolution & DR | 18-bit sigma-delta, 90 dB typical dynamic range - enables high-SNR recording from line/mic sources |
| DAC Resolution & DR | 18-bit sigma-delta, 89 dB typical dynamic range - supports clean playback at consumer line-level (1 Vrms) |
| Sample Rate Conversion | 4 kHz to 48 kHz in 1 Hz increments - allows precise synchronization with video/audio clocks without external PLL |
| Operating Temperature | −40°C ≤ TA ≤ +85°C - qualified for industrial-grade PC add-in cards and embedded audio subsystems |
| AC Link Interface | Primary/Secondary mode via ID0#/ID1# pins - enables daisy-chained multi-codec configurations supporting up to 8 input streams |
Pinout & Package
LQFP-48 package (PT0048A), 7 mm × 7 mm, 0.5 mm pitch, exposed thermal pad. Pin-compatible with LM4546B series; thermal resistance θJA = 74°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LINE_IN_L (23), LINE_IN_R (24) | Stereo line input | Accepts 1 Vrms nominal signals; selectable into ADC left/right channels or Stereo Mix 3D path with ±34.5 dB gain control |
| MIC1 (21), MIC2 (22) | Microphone inputs | Each supports 0 dB or 20 dB programmable boost; output routed to ADC or MONO_OUT via MIX bit in register 20h |
| LINE_OUT_L (35), LINE_OUT_R (36) | Stereo line output | Driven by Stereo Mix signal; amplitude controlled by Master Volume register (02h), 0 dB to −46.5 dB in 1.5 dB steps |
| MONO_OUT (37) | Mono output | Sum of mic inputs or stereo mix; selectable via MIX bit; volume adjustable via Mono Volume register (06h) |
| BIT_CLK (6), SYNC (10), SDATA_IN (8), SDATA_OUT (5) | AC Link interface | Standardized 48 kHz frame protocol; BIT_CLK derived internally from 24.576 MHz crystal; supports primary/secondary codec addressing |
| XTAL_IN (2), XTAL_OUT (3) | Crystal oscillator interface | Drives internal 24.576 MHz clock source; requires 33 pF load caps and 1 MΩ feedback resistor for fundamental-mode crystal |
| ID0# (45), ID1# (46) | Codec identity select | Inverted logic pins setting codec address (00–11); determines primary/secondary role in multi-codec AC Link topology |
Key Features
| Feature | Design Value |
|---|---|
| AC '97 Rev 2.1 compliance | Fully implements AC Link timing, register map, and frame structure - ensures interoperability with Intel ICH and compatible controllers |
| Texas Instruments 3D Sound | On-chip stereo enhancement circuitry applied to Stereo Mix 3D path - improves perceived spatial imaging without host CPU overhead |
| Independent ADC/DAC sample rate control | Separate programming of ADC and DAC rates enables simultaneous capture/playback at different frequencies (e.g., 44.1 kHz record / 48 kHz playback) |
| Advanced power management | Digital/analog shutdown modes reduce current to 19 µA (digital) and 70 µA (analog); supports warm/cold reset sequences per AC '97 spec |
| Extended analog mixer flexibility | Three stereo + two mono inputs feed two independent mixers (MIX1, MIX2); each input has dedicated mute/gain/attenuation registers |
Applications
| Desktop PC Audio Systems | Portable PC Audio Subsystems |
|---|---|
Use Scenario: Integrated audio on AMR/PCI add-in cards or chipset-based motherboard designs using AC Link interface. IC Role / Device Role / Timing Role: Primary AC '97 codec handling all analog I/O, sample rate conversion, and mixer functions for Windows-compatible audio stack. Use Value: Eliminates need for external op-amps or clock synthesizers; deterministic timing simplifies driver development and reduces buffer underrun risk. |
Use Scenario: Audio subsystem on Mobile Daughter Card (MDC) or laptop platform with AC Link–capable chipset or accelerator. IC Role / Device Role / Timing Role: Secondary codec in multi-codec configuration, providing additional input channels or stereo enhancement under shared controller. Use Value: Enables scalable audio I/O (e.g., separate mic/headset paths) while maintaining single-controller resource management and frame alignment. |
| Automotive Telematics HMI | Multi-Channel Audio Frequency Systems |
Use Scenario: Voice capture and alert playback in automotive infotainment or telematics control units operating across extended temperature range. IC Role / Device Role / Timing Role: Audio front-end codec interfacing microphone array and speaker outputs, synchronized to vehicle bus timing via AC Link or external clock. Use Value: −40°C to +85°C rating and robust ESD protection (2 kV HBM) ensure reliability in harsh cabin environments without derating. |
Use Scenario: General-purpose multi-input audio processing in test equipment, broadcast interfaces, or professional audio I/O modules. IC Role / Device Role / Timing Role: High-fidelity analog-to-digital/digital-to-analog conversion engine with flexible input routing and sample rate translation. Use Value: 90 dB ADC DR and 89 dB DAC DR support measurement-grade signal integrity; 1 Hz–granular SRC enables precise frequency domain alignment. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4550B | 6-channel AC '97 codec; no 3D Sound; lower analog mixer channel count; identical LQFP-48 package and AC Link interface | Targeted at cost-sensitive PC audio where stereo enhancement and extended mixer flexibility are not required | Select LM4550B when system only needs basic 6-channel streaming and avoids TI's 3D Sound feature set |
| AD1885 | Analog Devices AC '97 Rev 2.1 codec; 18-bit ADC/DAC; 92 dB DR; supports 48 kHz only (no variable SRC); different register map and pinout | Used in legacy Intel chipset platforms requiring drop-in compatibility with ADI reference designs | Choose AD1885 only if existing firmware/drivers are built for its register layout and fixed-rate operation |
Compared with LM4546BVH, LM4550B offers reduced feature depth but higher channel density in same footprint, while AD1885 provides superior DR at fixed 48 kHz but lacks programmable SRC and TI-specific enhancements - making LM4546BVH optimal for flexible, temperature-hardened, multi-rate PC audio designs.
Availability
LM4546BVH is available at Aetrix Electronics and suitable for desktop PC audio systems, portable PC subsystems, automotive telematics HMIs, and multi-channel audio frequency instrumentation requiring stable component supply across extended temperature and long-lifecycle production.
Supply support for LM4546BVH 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 signal chain solutions since the 1990s.
The LM4546BVH belongs to TI's AC '97 audio codec product line, designed specifically for PC and embedded audio systems requiring full analog functionality, deterministic timing, and backward-compatible digital interface compliance.
FAQ
What is the function of the ID0# and ID1# pins on the LM4546BVH?
The ID0# and ID1# pins (pins 45 and 46) configure the LM4546BVH's role in multi-codec AC Link systems. They set the codec's 2-bit identity (00–11) in inverted logic: grounded = logic 1, DVDD-connected = logic 0, NC = pulled high. This determines whether LM4546BVH operates as Primary (ID=00) or one of three Secondary codecs, enabling up to four devices on a single AC Link bus.
Does the LM4546BVH support both 3.3 V and 5 V digital supplies simultaneously?
Yes, the LM4546BVH supports dual digital supply domains: DVDD1 (pin 1) and DVDD2 (pin 9) can be independently powered at either 3.3 V or 5 V. This allows mixed-voltage board designs - for example, DVDD1 for core logic and DVDD2 for I/O buffers - while maintaining full AC Link timing compliance and register functionality across both supply ranges.
How does the LM4546BVH implement sample rate conversion?
The LM4546BVH uses two independent hardware sample rate converters: a 32-bit converter for ADC paths and a 6-bit converter for DAC paths. Both support programmable rates from 4 kHz to 48 kHz in exact 1 Hz steps, enabling asynchronous conversion without external clock synthesis. Conversion timing is deterministic, easing real-time scheduling in audio drivers and reducing jitter-induced artifacts.
What is the purpose of the VREF and VREF_OUT pins on the LM4546BVH?
VREF (pin 27) is the internal 2.2 V reference output, intended solely as a stable bias voltage for external microphone preamplifiers or analog sensors - it must not sink or source current. VREF_OUT is not a pin; the datasheet refers to VREF as the output node. Proper decoupling (3.3 µF + 0.1 µF) is required near pin 27 to maintain ADC/DAC accuracy and noise performance.
Can the LM4546BVH operate without an external crystal?
No - the LM4546BVH requires a 24.576 MHz fundamental-mode crystal connected between XTAL_IN (pin 2) and XTAL_OUT (pin 3), with 33 pF load capacitors and a 1 MΩ feedback resistor. An external 24.576 MHz oscillator may substitute for the crystal, but the oscillator signal must meet VIH/VIL thresholds and drive capability specs; no internal RC oscillator is provided.
LM4546BVH Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tray
- 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)
LM4546BVH FAQ
1.How can I place an order for LM4546BVH through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4546BVH 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 LM4546BVH reliable?
The price and inventory of LM4546BVH are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4546BVH is usually 5 days.
3.What payment methods are accepted for LM4546BVH?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4546BVH transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4546BVH?
LM4546BVH orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4546BVH 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 LM4546BVH?
For technical support, including LM4546BVH datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4546BVH requirements.
6.How does Aetrix verify that LM4546BVH is sourced from the original manufacturer or authorized distributors?
All LM4546BVH 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 LM4546BVH meets industry standards.
7.What is the process for return or replacement of LM4546BVH?
All LM4546BVH units undergo pre-shipment inspection (PSI). If there is an issue with LM4546BVH, 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 LM4546BVH part is unused and in its original packaging.
Return procedure for LM4546BVH:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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