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Details, datasheet, quote on part number:LM4915LQX
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| Part: | LM4915LQX |
| Category: | Multimedia => Audio => Amplifiers => Preamplifiers => Headphone Amplifiers |
| Description: | LM4915 - LM4915 Pseudo-differential Mono Headphone Amplifier With Fixed 6dB Gain, Package: Llp, Pin Nb=8 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4915LQX datasheet File size : 529 kB |
| Request For quote: | Find where to buy LM4915LQX
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Datasheet text preview:
LM4915 Pseudo-Differential Mono Headphone Amplifier with Fixed 6dB Gain
May 2003
LM4915 Pseudo-Differential Mono Headphone Amplifier with Fixed 6dB Gain
General Description
The LM4915 is a pseudo-differential audio power amplifier primarily designed for demanding applications in mobile phones and other portable audio device applications with mono headphones. It is capable of delivering 90 miliwatts of continuous average power to a 32 BTL load with less than 1% distortion (THD+N) from a 3VDC power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. The LM4915 does not require output coupling capacitors or bootstrap capacitors, and therefore is ideally suited for mobile phone and other low voltage applications where minimal power consumption is a primary requirement. The LM4915 features a low-power consumption shutdown mode. To facilitate this, Shutdown may be enabled by driving the shutdown pin low. Additionally, the LM4915 features an internal thermal shutdown protection mechanism. The LM4915 contains advanced pop & click circuitry which virtually eliminates noises which would otherwise occur during turn-on and turn-off transitions. The LM4915 has an internally fixed gain of 6dB.
Key Specifications
n n n n Improved PSRR at 217Hz and 1kHz 75dB Power Output at 5.0V & 1% THD into 32 280mW Power Output at 3.0V & 1% THD into 32 90mW Output Noise, A-weighted 20µV (typ) (typ) (typ) (typ)
Features
Pseudo-differential amplification Internal gain-setting resistors Available in space-saving LLP package Ultra low current shutdown mode Can drive capacitive loads up to 500pF Improved pop & click circuitry virtually eliminates noises during turn-on and turn-off transitions n 2.2 - 5.5V operation n No output coupling capacitors, snubber networks, bootstrap capacitors or gain-setting resistors required n Ultra low noise n n n n n n
Applications
n Mobile phones n PDAs n Portable electronics devices
Typical Application
200482B4
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS200482
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LM4915
Connection Diagrams
LQ Package
200482B5
Top View Order Number LM4915LQ See NS Package Number LQB08A 8 Pin LQ Marking
200482E7
X - Date Code TT - Die Traceability G - Boomer A5 - LM4915LQ
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LM4915
Absolute Maximum Ratings
(Note 2)
Junction Temperature Thermal Resistance JC (LQ) JA (LQ)
150°C 57°C/W 140°C/W
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) 6.0V -65°C to +150°C -0.3V to VDD + 0.3V Internally Limited 2000V 200V
Operating Ratings
Temperature Range TMIN TA TMAX Supply Voltage (VDD) -40°C TA +85°C 2.2V VCC 5.5V
Electrical Characteristics VDD = 5V (Notes 1, 2, 8)
Symbol Parameter
The following specifications apply for VDD = 5V, RL = 16 unless otherwise specified. Limits apply to TA = 25°C. Conditions LM4915 Typ (Note 6) IDD ISD VSDIH VSDIL PO Quiescent Power Supply Current Shutdown Current Shutdown Voltage Input High Shutdown Voltage Input Low Output Power THD = 1% (max); f = 1kHz RL = 16 RL = 32 BW = 20Hz to 20kHz, A-weighted VRIPPLE = 200mV sine p-p VIN = 0V VIN = 0V, IO = 0A VSHUTDOWN = GND 2 0.1 1.8 0.4 400 280 20 75 2 20 375 250 Limit (Note 7) 3.5 Note 9 Units (Limits) mA (max) µA(max) V V mW µV dB mV (max)
VNO PSRR VOS
Output Noise Voltage Power Supply Rejection Ratio Output Offset Voltage
Electrical Characteristics VDD = 3.0V (Notes 1, 2, 8)
Symbol Parameter
The following specifications apply for VDD = 3.0V, RL = 16 unless otherwise specified. Limits apply to TA = 25°C. Conditions LM4915 Typ (Note 6) IDD ISD VSDIH VSDIL PO Quiescent Power Supply Current Shutdown Current Shutdown Voltage Input High Shutdown Voltage Input Low Output Power THD = 1% (max); f = 1kHz RL = 16 RL = 32 BW = 20Hz to 20kHz, A-weighted VRIPPLE = 200mV sine p-p VIN = 0V VIN = 0V, IO = 0A VSHUTDOWN = GND 1.5 0.1 1.8 0.4 125 90 20 70 2 20 100 80 Limit (Note 7) 2.5 Note 9 Units (Limits) mA (max) µA(max) V V mW (min) µV dB mV (max)
VNO PSRR VOS
Output Noise Voltage Power Supply Rejection Ratio Output Offset Voltage
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, JA, and the ambient temperature, TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA)/ JA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4915, see power derating curves for more information. Note 4: Human body model, 100pF discharged through a 1.5k 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 specifications are guaranteed by design, test, or statistical analysis.
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