Features Easily drives 600Ω loads Optimized for superior audio signal fidelity Output short circuit protection PSRR and CMRR exceed 120dB (typ) SOIC and DIP packages Description The LME49740 is part of the ultra-low distortion, low noise, high slew rate operational amplifier series optimized and fully specified for high performance, high fidelity applications. Combining advanced leading-edge process technology with state-of-the-art circuit design, the LME49740 audio operational amplifiers deliver superior audio signal amplification for outstanding audio performance. The LME49740 combines extremely low voltage noise density (2.7nV/ √ ^HZ) with vanishingly low THD+N (0.00003%) to easily satisfy the most demanding audio applications. To ensure that the most challenging loads are driven without compromise, the LME49740 has a high slew rate of ±20V/μs and an output current capability of ±26mA. Further, dynamic range is maximized by an output stage that drives 2kΩ loads to within 1V of either power supply voltage and to within 1.4V when driving 600Ω loads. The LME49740's outstanding CMRR(120dB), PSRR(120dB), and VOS(0.1mV) give the amplifier excellent operational amplifier DC performance. The LME49740 has a wide supply range of ±2.5V to ±17V. Over this supply range the LME49740’s input circuitry maintains excellent common-mode and power supply rejection, as well as maintaining its low input bias current. The LME49740 is unity gain stable. The Audio Operational Amplifier achieves outstanding AC performance while driving complex loads with values as high as 100pF. The LME49740 is available in 14–lead narrow body SOIC and 14–lead plastic DIP. Demonstration boards are available for each package. Key Specification ■  Power Supply Voltage Range ±2.5V to ±17V ■  THD+N (AV = 1, VOUT = 3VRMS,    fIN = 1kHz)    RL = 2kΩ 0.00003% (typ)  RL = 600Ω 0.00003% (typ) ■  Input Noise Density 2.7nV/ √ ^Hz (typ) ■  Slew Rate ±20V/μs (typ) ■  Gain Bandwidth Product 55MHz (typ) ■  Open Loop Gain (RL = 600Ω) 140dB (typ) ■  Input Bias Current 10nA (typ) ■  Input Offset Voltage 0.1mV (typ) ■  DC Gain Linearity Error 0.000009% Applications Ultra high quality audio amplification High fidelity preamplifiers High fidelity multimedia State of the art phono pre amps High performance professional audio High fidelity equalization and crossover networks High performance line drivers High performance line receivers High fidelity active filters

Also Recommended LM4562▲ Dual High Performance High Fidelity Audio Op Amp LME49710▲ Single High Performance High Fidelity Audio Op Amp

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance *click for larger image THD+N Vs Frequency; Vcc = 17V, Vee = -17V, Rl = 600Ohm, Vout = 3Vrms

Parameters / Values	LME49740	LM4562	LME49710
THD	0.00003 %	0.00003 %	0.00003 %
PSRR	120 dB	120 dB	125 dB
Supply Min	5 Volt	5 Volt	5 Volt
Single/Dual/Quad	Quad	Dual	Single
Special Features	Very Low Noise, Ultra Low Distortion	Very Low Noise, Ultra Low Distortion	Very Low Noise, Ultra Low Distortion
THD Conditions	Av=1; Vout=3Vrms; Load=600ohm and 2k	Av=1; Vout=3Vrms; Load=600ohm and 2k	Av=1; Vout=3Vrms; Load=600ohm and 2k
PSRR Conditions	delta(Vs)=20V	delta(Vs)=20V	delta(Vs)=20V
Supply Current per Amplifier	4.62 mA	5.0 mA	4.8 mA
Supply Max	34 Volt	34 Volt	34 Volt
Shut down	No	No	No
Voltage Noise	2.5 nV/root(Hz)	2.7 nV/root(Hz)	2.5 nV/root(Hz)
Max Input Bias Current	72 nA	72 nA	72 nA
Output Current	30 mA	42 mA	26 mA
Offset Voltage, typ	0.1 mV	0.1 mV	0.05 mV
Gain Bandwidth	55 MHz	55 MHz	55 MHz
Slew Rate	20 Volts/usec	20 Volts/usec	20 Volts/usec
CMRR	120 dB	120 dB	120 dB
CMRR Conditions	Vcm from -10V to +10V	Vcm from -10V to +10V	Vcm from -10V to +10V
Temperature Min	-40 deg C	-40 deg C	-40 deg C
Temperature Max	85 deg C	85 deg C	85 deg C
Channels	4 Channels	2 Channels	1 Channels
Input OutputType	Not Rail to Rail	Not Rail to Rail	Not Rail to Rail
Offset Voltage max, 25C	0.7 mV	0.7 mV	0.7 mV
Automotive	Yes		Yes
PowerWise	Yes	Yes	Yes

Datasheets

Title		Size	Date	Other Language
	LME49740 Quad High Performance, High Fidelity Audio Operational Amplifier	463 Kbytes	8-Feb-08

Application Notes

Title		Size	Date	Other Language
	AN-1671: Application Note 1671 Gain and Linearity Testing for Precision Operational Amplifiers	417 Kbytes	21-May-08	日本語

Other Technical Documents

Title		Type	Date
	Class D Amplifier FAQs	External Article	2008-11-05

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LME49740MA/NOPB RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 140 AVNET-EM Worldwide 144 DIGI-KEY Worldwide 0 FARNELL Europe and Asia 185 TAYLOR Americas 165	$1.90 each at 1K+ pcs	rail of 55
LME49740MAX/NOPB RoHS Status	SOIC NARROW	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.90 each at 1K+ pcs	reel of 2500
LME49740NA/NOPB RoHS Status	MDIP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 177 AVNET-EM Worldwide 144 DIGI-KEY Worldwide 266 FARNELL Europe and Asia 423 NEWARK Americas 173 TAYLOR Americas 177	$1.90 each at 1K+ pcs	rail of 25

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LME49740.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LME49740 is located at RoHS Status.

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LME49740MABD	Quad High Performance, High Fidelity Audio Operational Amplifier (8-pin, SOIC Package)	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$150.00 each	1
Description: The LME49740 is a Quad High Fidelity Audio Operational Amplifier. This Audio Amplifier offers near zero THD+N and sets a new standard for high end audio users. Nationals newest Amplifier uses state of the art circuitry and process to achieve a new class of audio performance and technology. The AC and DC parameters in this amplifier series offers users a solution well suited for the most demanding signal path applications. There are two package choices to enable all users ease of use and evaluation criteria. The LME49740 is designed for high slew rate, low noise and high output for systems needing +/-2.5 to +/-17V functionality. The pin out is the National standard to quickly upgrade existing boards. This series is for applications such as high quality audio amplification, multi-media, imaging, line drivers/receivers and active filters. The output current is for 600Ohm loads with more than 26mA drive with THD+N over a wide voltage range. The LME49740MABD and LME49740NABD are evaluation boards designed to establish performance and evaluation to design the best end user system. The evaluation boards include all components for a ready-to-use, stand-alone bench work. Features: Quad Audio Operational Amplifier Ultra low THD+N of 0.00003% 34V operation and low noise 600Ohm loads SNR 97dB High output of 26mA Gain Bandwidth Product >55MHz 20uV/S Slew rate DC Gain Linearity Error of 0.000009% PSRR >120dB CMRR >120dB Vos is 0.1mV Two package offerings Applications: High Fidelity Audio Equipment High Fidelity drivers/receivers 34V Industrial applications Evaluation Board Contents: Fully Assembled LME49740 Evaluation Board Instructions for where to locate and download the datasheet

Part Number(s) (NSID)	Description	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LME49740NABD	Quad High Performance, High Fidelity Audio Operational Amplifier	Full production	Distributor Region Qty DIGI-KEY Worldwide 0	$200.00 each	1
Description: The LME49740 is a Quad High Fidelity Audio Operational Amplifier. This Audio Amplifier offers near zero THD+N and sets a new standard for high end audio users. Nationals newest Amplifier uses state of the art circuitry and process to achieve a new class of audio performance and technology. The AC and DC parameters in this amplifier series offers users a solution well suited for the most demanding signal path applications. There are two package choices to enable all users ease of use and evaluation criteria. The LME49740 is designed for high slew rate, low noise and high output for systems needing +/-2.5 to +/-17V functionality. The pin out is the National standard to quickly upgrade existing boards. This series is for applications such as high quality audio amplification, multi-media, imaging, line drivers/receivers and active filters. The output current is for 600Ohm loads with more than 26mA drive with THD+N over a wide voltage range. The LME49740MABD and LME49740NABD are evaluation boards designed to establish performance and evaluation to design the best end user system. The evaluation boards include all components for a ready-to-use, stand-alone bench work. Features: Quad Audio Operational Amplifier Ultra low THD+N of 0.00003% 34V operation and low noise 600Ohm loads SNR 97dB High output of 26mA Gain Bandwidth Product >55MHz 20uV/S Slew rate DC Gain Linearity Error of 0.000009% PSRR >120dB CMRR >120dB Vos is 0.1mV Two package offerings Applications: High Fidelity Audio Equipment High Fidelity drivers/receivers 34V Industrial applications Contents: Fully Assembled LME49740 Evaluation Board Instructions for where to locate and download the datasheet

National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

Lead Free product status is available through the search tool located here

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LME49740MA/NOPB	129.551	SOIC NARROW	14	1	260	Detail	N/A	spice file	NSUZXYTTE# LME49740 MA
LME49740MAX/NOPB	129.551	SOIC NARROW	14	1	260	Detail	N/A	spice file	NSUZXYTTE# LME49740 MA
LME49740NA/NOPB	986.751	MDIP	14	1	NA	Detail	N/A	spice file	NSUZXYYTTE# LME49740NA

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LME49740.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LME49740 is located at RoHS Status.

CAD Symbols and Models N/A

Models spice file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LME49740MA	VIP III	0	16160	0	0	1302500	3	369587931
LME49740MAX	VIP III	0	16160	0	0	1302500	3	369587931
LME49740NA	VIP III	0	16160	0	0	1302500	3	369587931

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LME49740.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LME49740 is located at RoHS Status.