PDF LM4982 Data sheet ( Hoja de datos )

Número de pieza	LM4982
Descripción	Stereo Headphone Amplifier
Fabricantes	National Semiconductor
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No Preview Available ! www.DataSheet4U.com February 2006 LM4982 Ground-Referenced, Ultra Low Noise, 80mW Stereo Headphone Amplifier with IntelliSense and I2C Volume Control General Description The LM4982 is a ground referenced, variable gain audio power amplifier capable of delivering 80mW of continuous average power into a 16Ω single-ended load with less than 1% THD+N from a 3V power supply. The I2C volume control allows +18 to -76 dB gain settings. The LM4982 utilizes advanced charge pump technology to generate the LM4982’s negative supply voltage. This elimi- nates the need for output-coupling capacitors typically used with single-ended loads. IntelliSense is a new circuit technology that allows the LM4982 to detect whether a mono or stereo headphone plug has been inserted into the output jack. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4982 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage appli- cations where minimal power consumption is a primary re- quirement. The LM4982 incorporates selectable low-power consump- tion shutdown and channel select modes. The LM4982 contains advanced pop & click circuitry that eliminates noises which would otherwise occur during turn-on and turn-off transitions. Key Specifications j Improved PSRR at 217Hz j Stereo Output Power at VDD = 3V, RL = 32Ω, THD+N = 1% j Shutdown current 66dB 51mW (typ) 0.1µA (typ) Features n Ground referenced outputs n I2C Volume and mode controls n Available in space-saving micro SMD package n Ultra low current shutdown mode n Advanced pop & click circuitry eliminates noises during turn-on and turn-off transitions n 1.6 – 4.0V operation n No output coupling capacitors, snubber networks, bootstrap capacitors or gain-setting resistors required n Mono/Stereo headphone detect Applications n Notebook PCs n Desktop PCs n Mobile Phones n PDAs n Portable electronic devices n MP3 Players Boomer® is a registered trademark of National Semiconductor Corporation. © 2006 National Semiconductor Corporation DS201614 www.national.com 1 page Audio Amplifier Electrical Characteristics VDD = 3V (Notes 1, 2) (Continued) The following specifications apply for VDD = 3V, RL = 16Ω, AV = 0dB, unless otherwise specified. Limits apply for TA = 25˚C. Symbol Parameter Conditions LM4982 Units Typical Limits (Notes 7, (Limits) (Note 6) 8) RINT Intellisense Threshold Resistance 3 Ω (min) 6 9 Ω (max) Control Interface Electrical Characteristics (Notes 1, 2) The following specifications apply for 1.6V < VDD < 4.0V, unless otherwise specified. Limits apply for TA = 25˚C. Symbol Parameter Conditions LM4982 Typical Limits (Notes 7, (Note 6) 8) t1 SCL period t2 SDA Setup Time t3 SDA Stable Time t4 Start Condition Time t5 Stop Condition Time VIH VIL 2.5 100 0 100 100 0.7 x I2CVDD 0.3 x I2CVDD Units (Limits) µs (min) ns (min) ns (min) ns (min) ns (min) V (min) V (max) Note 1: All voltages are measured with respect to the GND pin unless otherwise specified. Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit is given, however, the typical value is a good indication of device performance. Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature, TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA) / θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4982, see power derating currents for more information. Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor. Note 5: Machine Model, 220pF - 240pF discharged through all pins. Note 6: Typicals are measured at +25˚C and represent the parametric norm. Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). Note 8: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis. 5 www.national.com 5 Page Typical Performance Characteristics (Continued) Output Power vs Power Supply Voltage RL = 16Ω, f = 1kHz, Mono Output Power vs Power Supply Voltage RL = 16Ω, f = 1kHz, Stereo 201614B5 Output Power vs Power Supply Voltage RL = 32Ω, f = 1kHz, Mono 201614B6 Output Power vs Power Supply Voltage RL = 32Ω, f = 1kHz, Stereo 201614B7 Power Supply Current vs Power Supply Voltage VIN = 0V, Mono 201614B8 Power Supply Current vs Power Supply Voltage VIN = 0V, Stereo 201614A6 11 201614A7 www.national.com 11 Page

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