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Texas Instruments LM4546BVHX/NOPB
- Part No.:
- LM4546BVHX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- CODECS
- Package:
- 48-LQFP
- Datasheet:
-
LM4546BVHX/NOPB.pdf
- Description:
- IC AUDIO CODEC 2MULTICH 48-LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM4546BVHX/NOPB from Texas Instruments is a 18-bit AC '97 Rev 2.1–compliant multi-channel audio codec featuring dual stereo 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 increments. It delivers 90 dB ADC dynamic range, 89 dB DAC dynamic range, and 97 dB analog mixer dynamic range for desktop PC audio systems on PCI or AMR cards.
For engineers reviewing the LM4546BVHX/NOPB datasheet, LM4546BVHX/NOPB pinout, LM4546BVHX/NOPB application, or LM4546BVHX/NOPB equivalent, this device supports deterministic AC Link timing (BIT_CLK = 12.288 MHz, SYNC = 48 kHz), dual digital supply options (3.3 V or 5 V), extended industrial temperature operation (−40°C to +85°C), and multi-codec daisy-chaining via Extended AC Link for up to 8-channel streaming.
Technical Context
The LM4546BVHX/NOPB implements a fully AC '97 Rev 2.1–compliant digital interface with dedicated SDATA_IN (codec-to-controller), SDATA_OUT (controller-to-codec), BIT_CLK, and SYNC signals, supporting primary/secondary codec configuration via ID0#/ID1# pins. Its analog signal path includes three stereo inputs (LINE_IN, CD, AUX) plus two mono mic inputs (MIC1/MIC2) with programmable 0 dB/20 dB boost amplifiers, all routed through configurable stereo and mono mixers (MIX1/MIX2).
Sample rate conversion is implemented independently for ADC and DAC paths using high-precision sigma-delta architecture, enabling asynchronous operation between host controller and audio peripherals. The device integrates TI's 3D Sound circuitry to enhance stereo imaging without external DSP, and supports advanced power management including digital/analog shutdown modes with sub-20 µA quiescent current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| ADC Resolution | 18-bit sigma-delta - enables 90 dB typical dynamic range for high-fidelity recording |
| DAC Resolution | 18-bit sigma-delta - delivers 89 dB typical dynamic range for clean playback output |
| Sample Rate Range | 4 kHz to 48 kHz in 1 Hz steps - supports legacy and modern audio standards without clock source change |
| Analog Supply Range | 4.2 V to 5.5 V - compatible with standard 5 V PC power rails and tolerant of ripple |
| Digital Supply Options | 3.0 V to 5.5 V - allows direct interfacing with 3.3 V or 5 V logic controllers |
| Operating Temperature | −40°C to +85°C - qualified for industrial and embedded PC motherboard environments |
| AC Link Timing | BIT_CLK = 12.288 MHz, SYNC = 48 kHz - ensures deterministic frame alignment and low-jitter data transfer |
Pinout & Package
LQFP-48 package (PT0048A), 7 mm × 7 mm, 0.5 mm pitch, thermally enhanced with exposed thermal pad. Pin 1 marked by dot; pin numbering follows standard counter-clockwise sequence from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 (DVDD1, DVDD2) | Digital supply inputs | Accept independent 3.3 V or 5 V digital supplies; decoupling required per datasheet layout guidelines |
| 2, 3 (XTAL_IN, XTAL_OUT) | 24.576 MHz crystal oscillator interface | Supports fundamental-mode crystal or external oscillator; defines master clock for AC Link and internal converters |
| 5 (SDATA_OUT) | Controller-to-codec serial data input | Samples on falling edge of BIT_CLK; carries DAC PCM data and register writes |
| 6 (BIT_CLK) | AC Link bit clock | Output in Primary mode (12.288 MHz); input in Secondary mode - synchronizes all AC Link transfers |
| 8 (SDATA_IN) | Codec-to-controller serial data output | Drives on rising edge of BIT_CLK; carries ADC PCM data and status reads |
| 10 (SYNC) | Frame synchronization and warm reset | 48 kHz active-high pulse marks AC Link frame start; also triggers asynchronous warm reset |
| 11 (RESET#) | Active-low hardware reset | Mandatory cold reset after power stabilization; initializes registers and forces PC_BEEP to LINE_OUT |
| 12–13, 18–24 (PC_BEEP, PHONE, CD_L/R, LINE_IN_L/R) | Analog inputs | All line-level (1 Vrms nominal) except MIC1/MIC2; each with dedicated volume/mute control and mixer routing |
| 21–22 (MIC1, MIC2) | Mono microphone inputs | Programmable 0 dB/20 dB boost amplifier; selectable to ADC left/right or stereo/mono mixer paths |
| 35–36 (LINE_OUT_L, LINE_OUT_R) | Stereo line outputs | 1 Vrms nominal; driven from MIX2 via Master Volume register (02h); 0 dB to −46.5 dB attenuation in 1.5 dB steps |
| 37 (MONO_OUT) | Mono line output | Configurable source: mic input (post-boost) or mono sum of Stereo Mix 3D; controlled by Mono Volume register (06h) |
| 45–46 (ID0#, ID1#) | Codec identity select | Inverted logic inputs determining primary/secondary mode and address in multi-codec AC Link systems |
Key Features
| Feature | Design Value |
|---|---|
| AC '97 Rev 2.1 compliance | Fully implements AC Link protocol including extended frame support for up to 8-channel streaming in multi-codec systems |
| Independent ADC/DAC sample rate control | Enables asynchronous audio subsystems - e.g., 44.1 kHz playback while recording at 48 kHz without resampling artifacts |
| Texas Instruments 3D Sound enhancement | Hardware-based stereo widening and depth processing applied pre-DAC; no host CPU overhead or latency penalty |
| Dual digital supply flexibility | Separate DVDD1/DVDD2 pins allow mixed-voltage system integration - e.g., 3.3 V controller interface with 5 V legacy peripheral compatibility |
| Advanced power management | Digital/analog shutdown modes reduce total current to <20 µA; supports rapid wake-up and low-power standby states |
| Robust analog input architecture | CD_GND pin provides AC-coupled common-mode reference for CD_L/CD_R, improving SNR against ground noise in stereo sources |
Applications
| Desktop PC Audio Systems | Portable PC Audio Subsystems |
|---|---|
Use Scenario: Integrated audio solution on AMR or PCI add-in cards for business desktops requiring PC99 compliance and multi-input mixing. IC Role / Device Role / Timing Role: Central AC '97 audio codec handling all analog I/O, sample rate conversion, and mixer functions under AC Link control. Use Value: Eliminates need for discrete op-amps, filters, and clock generators - reduces BOM count and PCB area while meeting PC99 dynamic range requirements (≥90 dB). |
Use Scenario: Audio subsystem on MDC (Mobile Daughter Card) for thin-and-light notebooks with space-constrained layouts. IC Role / Device Role / Timing Role: Single-package audio interface bridging baseband processor AC Link to headset, speaker, and mic connectors. Use Value: Supports simultaneous stereo playback and mono recording with TI 3D Sound enhancement - improves perceived audio quality without increasing host processing load. |
| Automotive Telematics HMI | Multi-Channel Audio Frequency Systems |
Use Scenario: Voice interface module in automotive infotainment systems requiring robust mic input handling and wide temperature operation. IC Role / Device Role / Timing Role: Audio front-end codec converting analog mic signals to AC Link PCM for voice recognition engine, with 20 dB mic boost and noise-resistant CD_GND reference. Use Value: −40°C to +85°C rating and 86 dB mute attenuation ensure reliable operation in vehicle cabin environments with high EMI and thermal cycling. |
Use Scenario: General-purpose audio frequency processing platform supporting custom sampling rates and multi-source mixing for test equipment or broadcast gear. IC Role / Device Role / Timing Role: Programmable sample rate converter and analog mixer enabling flexible input/output routing across 6+ analog channels. Use Value: 1 Hz resolution sample rate tuning and deterministic AC Link timing simplify firmware development for non-standard audio formats (e.g., 11.025 kHz, 32 kHz). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio codec applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM4550BVF/NOPB | 6-channel AC '97 Rev 2.1 codec; lacks 3D Sound circuitry and independent ADC/DAC sample rate control | Optimized for cost-sensitive single-codec systems; supports only 48 kHz fixed-rate operation | Select when 3D enhancement and asynchronous sample rate conversion are not required and board space is constrained |
| AD1981BSTZ | Analog Devices AC '97 Rev 2.2 codec; higher 94 dB DAC dynamic range but no integrated 3D processing | Targeted at premium audio PCs; requires external DSP for spatial enhancement | Prefer when maximum DAC fidelity is critical and host-side DSP resources are available for post-processing |
Compared with LM4546BVHX/NOPB, LM4550BVF/NOPB offers lower system cost but sacrifices stereo enhancement and flexible sample rate control, while AD1981BSTZ delivers superior DAC performance at the expense of added software complexity and BOM count.
Availability
LM4546BVHX/NOPB is available at Aetrix Electronics and suitable for desktop PC audio systems, portable PC subsystems, automotive telematics HMIs, and multi-channel audio frequency systems requiring stable component supply, long-term lifecycle support, and guaranteed AC '97 Rev 2.1 compliance.
Supply support for LM4546BVHX/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 leader specializing in analog, embedded processing, and connectivity technologies, with decades of expertise in high-fidelity audio signal processing and PC platform components.
The LM4546BVHX/NOPB belongs to TI's AC '97 audio codec product line, designed specifically to deliver PC99-compliant, multi-input/multi-output audio functionality in a single LQFP package for cost- and space-constrained motherboard and add-in card designs.
FAQ
What is the primary function of the LM4546BVHX/NOPB in an AC '97 audio system?
The LM4546BVHX/NOPB serves as the complete analog front-end audio codec in AC '97 Rev 2.1–compliant systems, performing simultaneous stereo analog-to-digital conversion (ADC), digital-to-analog conversion (DAC), analog mixing of up to six inputs, and Texas Instruments' 3D Sound stereo enhancement - all synchronized to the AC Link interface. It replaces discrete op-amps, filters, and clock generators in PC audio architectures.
Does the LM4546BVHX/NOPB support multiple sample rates simultaneously?
Yes, the LM4546BVHX/NOPB supports independent sample rate programming for its ADC and DAC paths, ranging from 4 kHz to 48 kHz in 1 Hz increments. This enables true asynchronous operation - for example, recording at 44.1 kHz while playing back at 48 kHz - without requiring external resampling or introducing jitter-induced artifacts.
How does the CD_GND pin improve audio performance in the LM4546BVHX/NOPB?
The CD_GND pin on the LM4546BVHX/NOPB acts as an AC-coupled common-mode reference for the CD_L and CD_R inputs, forming a quasi-differential stereo input pair. By rejecting ground noise shared between the left and right channels, it improves SNR and channel balance - especially critical when interfacing with CD-ROM drives or other stereo sources with imperfect ground isolation.
What are the power supply requirements for the LM4546BVHX/NOPB?
The LM4546BVHX/NOPB requires separate analog and digital supplies: AVDD must be 4.2 V to 5.5 V, while DVDD1 and DVDD2 accept 3.0 V to 5.5 V - supporting both 3.3 V and 5 V logic interfaces. Analog ground (AVSS) and two digital grounds (DVSS1, DVSS2) must be connected at a single point beneath the package to minimize noise coupling between domains.
Can the LM4546BVHX/NOPB operate in multi-codec configurations?
Yes, the LM4546BVHX/NOPB supports multi-codec AC Link systems via its Extended AC Link configuration, using ID0# and ID1# pins to assign primary or secondary codec identity. Up to eight codecs can share one controller's serial data bus, with output frames carrying two streams to multiple codecs and input frames supporting up to eight simultaneous channels of streaming data.
LM4546BVHX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 48-LQFP
- Packaging:
- Tape & Reel (TR)
- 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)
LM4546BVHX/NOPB FAQ
1.How can I place an order for LM4546BVHX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM4546BVHX/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 LM4546BVHX/NOPB reliable?
The price and inventory of LM4546BVHX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM4546BVHX/NOPB is usually 5 days.
3.What payment methods are accepted for LM4546BVHX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM4546BVHX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM4546BVHX/NOPB?
LM4546BVHX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM4546BVHX/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 LM4546BVHX/NOPB?
For technical support, including LM4546BVHX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM4546BVHX/NOPB requirements.
6.How does Aetrix verify that LM4546BVHX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM4546BVHX/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 LM4546BVHX/NOPB meets industry standards.
7.What is the process for return or replacement of LM4546BVHX/NOPB?
All LM4546BVHX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM4546BVHX/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 LM4546BVHX/NOPB part is unused and in its original packaging.
Return procedure for LM4546BVHX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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