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Texas Instruments LME49721MAX/NOPB
- Part No.:
- LME49721MAX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LME49721MAX/NOPB.pdf
- Description:
- IC AUDIO 2 CIRCUIT 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,295
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Product details
Overview
LME49721MAX/NOPB from Texas Instruments is a dual-channel, rail-to-rail input/output audio operational amplifier optimized for high-fidelity signal amplification. It delivers 0.00008% THD+N (RL = 2kΩ), ±8.5V/μs slew rate, and 4nV/√Hz input noise density, enabling ultra-low-distortion performance in line-level audio stages and preamplifier circuits.
For engineers reviewing the LME49721MAX/NOPB datasheet, LME49721MAX/NOPB pinout, LME49721MAX/NOPB application, or LME49721MAX/NOPB equivalent, key selection criteria include its 20MHz gain bandwidth product, 118dB open-loop gain at 600Ω load, rail-to-rail output swing within 10mV of supply rails, and guaranteed operation from –40°C to +85°C in SOIC-8 packaging.
Technical Context
The LME49721MAX/NOPB employs advanced CMOS process technology with fully differential input stage and Class AB output stage, achieving unity-gain stability without external compensation. Its input bias current of 40fA and input offset voltage of 0.3mV support precision DC-coupled audio paths and high-impedance sensor interfaces.
Designed for dual-supply (±1.1V to ±2.75V) or single-supply (2.2V to 5.5V) operation, the device maintains >93dB CMRR and 103dB PSRR across audio band, with channel-to-channel isolation exceeding 117dB - critical for stereo channel separation in professional audio equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.2V to 5.5V single supply or ±1.1V to ±2.75V dual supply - supports portable battery-powered and fixed-line audio systems |
| THD+N (1kHz, 4Vp-p, RL = 2kΩ) | 0.00008% typical - enables transparent signal reproduction in high-end DAC output stages |
| Slew Rate | ±8.5V/μs typical - preserves transient fidelity for wideband audio signals up to 20kHz without slew-induced distortion |
| Gain Bandwidth Product | 20MHz typical - allows stable operation at AV ≥ 10 with sufficient phase margin for active filters and equalizers |
| Input Noise Density | 4nV/√Hz at 1kHz - ensures minimal contribution to system noise floor in low-level microphone and phono preamp inputs |
| Output Voltage Swing | Within 10mV of each rail at 10kΩ load - maximizes dynamic range in low-voltage, rail-to-rail signal chains |
| Quiescent Current | 2.15mA per amplifier - balances ultra-low noise with power efficiency in dual-channel designs |
Pinout & Package
Package: 8-pin SOIC (D package), RoHS-compliant, moisture sensitivity level 1, rated for –40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output A | Amplifier A output node - drives loads down to 600Ω with ±9.7mA short-circuit current capability |
| 2 | Inverting Input A | High-impedance (40fA bias) differential input for channel A - accepts balanced or single-ended configurations |
| 3 | Non-inverting Input A | High-impedance differential input for channel A - supports DC-coupled gain-setting networks |
| 4 | VSS (Ground / Negative Supply) | Power reference for dual supply or ground return for single supply - requires local 0.1μF + 10μF bypassing |
| 5 | Non-inverting Input B | High-impedance differential input for channel B - electrically isolated from channel A with >117dB crosstalk rejection |
| 6 | Inverting Input B | High-impedance differential input for channel B - supports independent gain and feedback configuration |
| 7 | Output B | Amplifier B output node - fully independent channel with identical AC/DC specs to channel A |
| 8 | VDD (Positive Supply) | Power input for dual supply or positive rail for single supply - supports 2.2V–5.5V operation with <3.25mA max quiescent current |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input and output | Enables full-scale signal handling in low-voltage systems (e.g., 3.3V single supply) without clipping or headroom loss |
| 0.00008% THD+N at 1kHz | Meets studio-grade audio fidelity requirements for mastering and broadcast applications |
| 4nV/√Hz input noise density | Preserves signal integrity in high-gain preamplifier stages where noise dominates SNR |
| Channel-to-channel isolation >117dB | Maintains stereo image accuracy and prevents crosstalk-induced imaging artifacts |
| Unity-gain stable, no external compensation | Reduces BOM count and layout complexity in buffer, gain-of-1, and active filter designs |
Applications
| Ultra-High-Fidelity Line Driver | Professional Phono Preamp |
|---|---|
Use Scenario: Driving long analog interconnects between DAC modules and headphone amplifiers in portable high-res audio players. IC Role / Device Role / Timing Role: Dual-channel line driver providing matched gain, low output impedance (<0.01Ω), and rail-to-rail swing to preserve dynamic range. Use Value: Delivers 118dB open-loop gain and <0.0001% THD+N into 600Ω loads - eliminating audible distortion even at peak output levels. | Use Scenario: RIAA-equalized amplification of moving-magnet cartridge signals in turntable preamplifiers. IC Role / Device Role / Timing Role: Low-noise, high-PSRR dual op-amp implementing precise 35dB gain with A-weighted 0.33μV input noise. Use Value: 4nV/√Hz input noise density and 103dB PSRR suppress power supply ripple and thermal noise - critical for sub-mV cartridge signals. |
| Active Audio Crossover Network | DAC I–V Conversion Stage |
Use Scenario: Implementing 2nd-order Butterworth high-pass and low-pass filters in bi/tri-amped loudspeaker management systems. IC Role / Device Role / Timing Role: Dual op-amp configured as precision active filter with 20MHz GBW supporting steep roll-off above 20kHz. Use Value: 20MHz gain bandwidth and 8.5V/μs slew rate ensure linear phase response and minimal group delay distortion in crossover bands. | Use Scenario: Converting current-mode output from stereo DACs (e.g., PCM1794) into low-impedance voltage signals for subsequent filtering. IC Role / Device Role / Timing Role: Precision I–V converter with ultra-low input bias current (40fA) and 0.3mV offset to minimize DC error and harmonic generation. Use Value: 40fA input bias current prevents DAC output node loading; 0.3mV offset ensures <1 LSB error in 24-bit audio systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar audio operational amplifier applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| OPA2134PA | Higher 8nV/√Hz input noise, lower 10MHz GBW, no rail-to-rail output - limited output swing at low supply voltages | Better suited for non-rail-to-rail legacy designs; less ideal for 3.3V portable audio | Select when legacy footprint compatibility is required and rail-to-rail output is not needed |
| NE5532DR | Higher 5nV/√Hz noise, higher 8mA quiescent current per channel, no rail-to-rail input - requires input biasing network | Preferred in high-current line drivers but unsuitable for low-voltage, low-noise preamp stages | Select for industrial audio infrastructure where power efficiency and ultra-low noise are secondary to drive strength |
Compared with OPA2134PA and NE5532DR, the LME49721MAX/NOPB provides superior THD+N (0.00008% vs ≥0.0005%), lower input noise (4nV/√Hz), and true rail-to-rail operation - making it the optimal choice for next-generation portable and studio-grade audio signal chains requiring maximum fidelity at minimum supply voltage.
Availability
LME49721MAX/NOPB is available at Aetrix Electronics and suitable for ultra-high-fidelity portable audio, professional phono preamplifiers, and active audio crossover networks requiring stable component supply and long-term production continuity.
Supply support for LME49721MAX/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 delivering analog and embedded processing solutions for industrial, automotive, and consumer applications.
The LME49721MAX/NOPB belongs to TI's LME high-fidelity audio op-amp family, engineered specifically for ultra-low-noise, ultra-low-distortion signal conditioning in premium audio equipment - from studio monitors to high-resolution portable players.
FAQ
What is the operating temperature range for the LME49721MAX/NOPB?
The LME49721MAX/NOPB is specified for continuous operation from –40°C to +85°C ambient temperature. This industrial-grade rating ensures reliable performance in portable audio devices exposed to environmental extremes and in rack-mounted professional audio gear with elevated internal temperatures. All key parameters - including THD+N, PSRR, and output swing - are guaranteed across this full range.
Does the LME49721MAX/NOPB require external compensation for unity-gain stability?
No, the LME49721MAX/NOPB is internally compensated and unity-gain stable. It does not require external capacitors or resistors to maintain stability at AV = 1, simplifying design of voltage followers, I–V converters, and active filters. The 20MHz gain bandwidth product and phase margin are fully characterized and guaranteed under all recommended operating conditions for the LME49721MAX/NOPB.
Can the LME49721MAX/NOPB be used in single-supply configurations?
Yes, the LME49721MAX/NOPB supports single-supply operation from 2.2V to 5.5V. Its rail-to-rail input and output stages allow full-swing signal handling without level-shifting circuitry. For proper biasing, the common-mode input voltage must remain within (V–) + 0.1V to (V+) – 0.1V - typically achieved using a VDD/2 reference on the non-inverting input for AC-coupled applications. This capability makes the LME49721MAX/NOPB ideal for battery-powered audio devices.
What is the maximum output current capability of the LME49721MAX/NOPB?
The LME49721MAX/NOPB delivers ±9.7mA minimum output current into 250Ω loads at VS = 5.0V, with continuous short-circuit protection. This enables direct driving of low-impedance headphones (e.g., 32Ω) in buffered configurations and robust interfacing with ADC input stages or active filter networks. Output current remains stable across the full –40°C to +85°C temperature range and is fully characterized in the official LME49721MAX/NOPB datasheet.
How does the LME49721MAX/NOPB compare to legacy audio op-amps like the NE5532 in THD+N performance?
The LME49721MAX/NOPB achieves 0.00008% THD+N (typical, RL = 2kΩ), over six times lower than the NE5532's typical 0.0005%. This difference is measurable and audible in high-resolution playback systems, especially at high output levels and wide bandwidths. The LME49721MAX/NOPB also offers rail-to-rail output swing, 4nV/√Hz input noise (vs 5nV/√Hz), and lower 2.15mA quiescent current - collectively enabling higher fidelity and lower power consumption than the NE5532 in modern audio designs.
LME49721MAX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- LME®
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Audio
- Number of Circuits:
- 2
- Output Type:
- Rail-to-Rail
- Slew Rate:
- 8.5V/µs
- Gain Bandwidth Product:
- 20 MHz
- -3db Bandwidth:
- 2.2 MHz
- Current - Input Bias:
- 0.04 pA
- Voltage - Input Offset:
- 300 µV
- Current - Supply:
- 2.15mA (x2 Channels)
- Current - Output / Channel:
- 9.7 mA
- Voltage - Supply Span (Min):
- 2.2 V
- Voltage - Supply Span (Max):
- 5.5 V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
LME49721MAX/NOPB FAQ
1.How can I place an order for LME49721MAX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LME49721MAX/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 LME49721MAX/NOPB reliable?
The price and inventory of LME49721MAX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LME49721MAX/NOPB is usually 5 days.
3.What payment methods are accepted for LME49721MAX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LME49721MAX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LME49721MAX/NOPB?
LME49721MAX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LME49721MAX/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 LME49721MAX/NOPB?
For technical support, including LME49721MAX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LME49721MAX/NOPB requirements.
6.How does Aetrix verify that LME49721MAX/NOPB is sourced from the original manufacturer or authorized distributors?
All LME49721MAX/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 LME49721MAX/NOPB meets industry standards.
7.What is the process for return or replacement of LME49721MAX/NOPB?
All LME49721MAX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LME49721MAX/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 LME49721MAX/NOPB part is unused and in its original packaging.
Return procedure for LME49721MAX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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