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LM4549BVHX/NOPB
Texas Instruments
IC AUDIO CODEC 2MULTICH 48-LQFP
1711 Pcs New Original In Stock
Audio, AC '97 Interface 18 b Serial 48-LQFP (7x7)
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5.0 / 5.0
- (308 Ratings)
LM4549BVHX/NOPB
Product Overview
1326835
DiGi Electronics Part Number
LM4549BVHX/NOPB-DGManufacturer
Texas Instruments
LM4549BVHX/NOPB
Description
IC AUDIO CODEC 2MULTICH 48-LQFPInventory
1711 Pcs New Original In Stock
Audio, AC '97 Interface 18 b Serial 48-LQFP (7x7)
Quantity
Minimum 1
Minimum 1
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LM4549BVHX/NOPB Technical Specifications
Category
Interface, CODECS
Packaging
Cut Tape (CT) & Digi-Reel®
Series
-
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
Mounting Type
Surface Mount
Package / Case
48-LQFP
Supplier Device Package
48-LQFP (7x7)
Base Product Number
LM4549
Datasheet & Documents
HTML Datasheet
LM4549BVHX/NOPB-DG
Environmental & Export Classification
RoHS Status
ROHS3 Compliant
Moisture Sensitivity Level (MSL)
3 (168 Hours)
REACH Status
REACH Unaffected
ECCN
EAR99
HTSUS
8542.39.0001
Additional Information
Other Names
LM4549BVHX/NOPBCT
LM4549BVHXNOPB
LM4549BVHX/NOPBDKR
LM4549BVHX/NOPBTR
Standard Package
1,000
Reviews
5.0/5.0-(Show up to 5 Ratings)
de desembre 02, 2025
고객 지원이 정말 따뜻하고 전문적이에요. 언제나 믿고 문의할 수 있어요.
de desembre 02, 2025
Livraison ultra rapide, je suis très impressionné. C'est rassurant de faire affaire avec eux.
de desembre 02, 2025
The careful packaging provided by DiGi Electronics prevents any damage during transit.
de desembre 02, 2025
Timely deliveries are a hallmark of DiGi Electronics' logistics excellence.
de desembre 02, 2025
They consistently offer competitive prices and fast responses to any post-purchase questions.
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Frequently Asked Questions (FAQ)
Can the LM4549BVHX/NOPB be used as a drop-in replacement for the older LM4550B in an existing AC'97 motherboard design, and what firmware or hardware changes might be required?
While the LM4549BVHX/NOPB shares the AC'97 interface and pin-compatible 48-LQFP package with the LM4550B, it is not a fully drop-in replacement due to differences in power sequencing requirements and register map implementation. The LM4549BVHX/NOPB requires stricter adherence to analog (4.2V–5.5V) and digital (3.3V–5.5V) supply ramp timing—specifically, the digital supply must stabilize before or simultaneously with the analog supply to avoid latch-up or incorrect initialization. Additionally, BIOS or driver-level firmware may need updates to accommodate minor differences in control register defaults and power-down modes. Always validate power-on reset behavior and codec ID register reads during integration.
What are the key thermal and layout considerations when designing a compact PCB with the LM4549BVHX/NOPB to avoid audio performance degradation?
The LM4549BVHX/NOPB’s 48-LQFP (7x7 mm) package has an exposed thermal pad that must be soldered to a grounded copper pour for optimal heat dissipation and signal integrity. Poor thermal management can elevate die temperature beyond the recommended operating range (-40°C to 85°C), increasing noise floor and reducing SNR. Keep analog ground planes separate from digital return paths, and route high-speed serial data (SDATA_OUT/IN) away from analog input traces to prevent crosstalk. Use a solid ground plane beneath the device and minimize via stubs in the audio signal path to preserve the 90 dB dynamic range of the ADCs and 89 dB of the DACs.
How does the LM4549BVHX/NOPB compare to the newer TI TLV320AIC23B in terms of power efficiency and integration for battery-powered audio systems?
The LM4549BVHX/NOPB is optimized for AC'97-compliant desktop and industrial systems with stable 3.3V/5V rails, whereas the TLV320AIC23B offers superior power efficiency (as low as 10 mW in standby) and integrates a microphone preamp, headphone driver, and I²C control—making it better suited for portable devices. The LM4549BVHX/NOPB lacks built-in amplifiers and consumes more static power, but provides higher compatibility with legacy AC'97 host controllers. For new low-power designs, consider migrating to the TLV320AIC23B; however, if AC'97 host integration is mandatory and power budget allows, the LM4549BVHX/NOPB remains viable with careful power-domain management.
What reliability risks should I evaluate when using the LM4549BVHX/NOPB in an industrial environment with frequent thermal cycling between -20°C and 70°C?
Although the LM4549BVHX/NOPB is rated for -40°C to 85°C operation, repeated thermal cycling in industrial settings can stress the 48-LQFP package solder joints, especially if the PCB has mismatched coefficient of thermal expansion (CTE). Moisture sensitivity level (MSL) 3 indicates the device can withstand 168 hours of ambient conditions after moisture exposure before reflow—ensure proper baking if stored in humid environments. Additionally, verify long-term drift of reference voltages and clock stability under temperature swings, as sigma-delta ADCs/DACs are sensitive to reference noise. Implement underfill or conformal coating if mechanical stress or condensation is expected.
Is it safe to operate the LM4549BVHX/NOPB with a single 5V supply for both analog and digital domains, and what performance trade-offs should I expect?
Yes, the LM4549BVHX/NOPB can operate with a single 5V supply connected to both analog (AVDD) and digital (DVDD) pins, as both supply ranges include 5V. However, sharing a supply increases the risk of digital switching noise coupling into the analog section, potentially degrading the typical 90 dB ADC and 89 dB DAC dynamic range. To mitigate this, use a dedicated LC filter or ferrite bead on the AVDD line and place decoupling capacitors (100 nF ceramic + 10 µF tantalum) as close as possible to the respective supply pins. For mission-critical audio applications, maintaining separate, clean analog and digital supplies is strongly recommended despite the added complexity.
Quality Assurance (QC)
DiGi ensures the quality and authenticity of every electronic component through professional inspections and batch sampling, guaranteeing reliable sourcing, stable performance, and compliance with technical specifications, helping customers reduce supply chain risks and confidently use components in production.
LM4549BVHX/NOPB CAD Models
Texas Instruments LM4549BVHX/NOPB PCB symbols & footprints
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