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Details, datasheet, quote on part number:LM4912MM
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| Part: | LM4912MM |
| Category: | Multimedia => Audio => Amplifiers => Preamplifiers => Headphone Amplifiers |
| Description: | LM4912 - LM4912 Stereo 40mW Low Noise Headphone Amplifier, Package: Mini Soic, Pin Nb=10 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4912MM datasheet File size : 716 kB |
| Request For quote: | Find where to buy LM4912MM
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Datasheet text preview:
LM4912 Stereo 40mW Low Noise Headphone Amplifier
June 2003
LM4912 Stereo 40mW Low Noise Headphone Amplifier
General Description
The LM4912 is an stereo audio power amplifier capable of delivering 40mW per channel of continuous average power into a 16 load or 25mW per channel into a 32 load at 1% THD form a 3V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4912 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The LM4912 features a low-power consumption shutdown mode and a power mute mode that allows for faster turn on time with less than 1mV voltage change at outputs on release. Additionally, the LM4912 features an internal thermal shutdown protection mechanism. The LM4912 is unity gain stable and may be configured with external gain-setting resistors.
Key Specifications
n PSRR at 217 Hz and 1kHz 65dB (typ) n Output Power at 1kHz with VDD = 2.4V, 1% THD+N into a 16 load 25mW (typ) n Output Power at 1kHz with VDD = 3V, 1% THD+N into a 16 load 40mW (typ) n Shutdown Current 1.0µA (max) n Output Voltage change on release from Shutdown VDD = 2.4V, RL = 16 1mV (max) n Output Noise, 20Hz to 20kHz, A-weighted 10µV (typ)
Features
External gain-setting capability Available in space-saving MSOP package Ultra low current shutdown mode Mute mode allows fast turn-on (10ms) with less than 1mV change on outputs n 2.0V - 5.5V operation n Ultra low noise n Operation at low supply voltages n n n n
Applications
n Portable CD players n PDAs n Portable electronics devices
Typical Application
20048180
FIGURE 1. Typical Capacitive Coupled Output Configuration Circuit
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS200481
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LM4912
Connection Diagrams
MSOP Package
20048179
Top View Order Number LM4912MM See NS Package Number MUB10A MSOP Package
200481A9
Top View G-Boomer Family A3 - LM4912MM
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LM4912
Absolute Maximum Ratings
(Note 2)
Junction Temperature Thermal Resistance JC (MSOP) JA (MSOP)
150°C 56°C/W 190°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) 4.0V -65°C to +150°C -0.3V to VDD + 0.3V Internally Limited 2000V 250V
Operating Ratings
Temperature Range TMIN TA TMAX Supply Voltage (VDD) -40°C T
A
85°C
2.0V VDD 5.5V
The following specifications apply for VDD = 5.0V, RL = 16, CO = 100µ, and CB = 4.7µF unless otherwise specified. Limits apply to TA = 25°C. Symbol Parameter Conditions LM4912 Typ (Note 6) IDD ISD IM VSDIH VSDIL VMIH VMIL PO VNO PSRR AM Quiescent Power Supply Current Shutdown Current Mute Current Shutdown Voltage Input High Shutdown Voltage Input Low Mute Voltage Input High Mute Voltage Input Low THD = 1%; f = 1kHz Output Power Output Noise Voltage Power Supply Rejection Ratio Mute Attenuation R = 16 R = 32 BW = 20 Hz to 20kHz, A-weighted VRIPPLE = 200mV sine p-p f = 1kHz 145 80 10 65 85 µV dB dB mW VIN = 0V, IO = 0A VSHUTDOWN = GND VMUTE = VDD 2 0.1 2 1.8 0.4 1.8 0.4 Limit (Note 7) 5 2.0 5 Units (Limits) mA (max) µA (max) mA (max) V V V V
Electrical Characteristics VDD = 5.0V (Notes 1, 2)
The following specifications apply for VDD = 3.0V, RL = 16, CO = 100µF, and CB = 4.7µF unless otherwise specified. Limits apply to TA = 25°C. Symbol Parameter Conditions LM4912 Typ (Note 6) IDD ISD IM PO VNO PSRR AM Quiescent Power Supply Current Shutdown Current Mute Current Output Power Output Noise Voltage Power Supply Rejection Ratio Mute Attenuation VIN = 0V, IO = 0A VSHUTDOWN = GND VMUTE = VDD THD = 1%; f = 1kHz R = 16 R = 32 BW = 20 Hz to 20kHz, A-weighted VRIPPLE = 200mV sine p-p f = 1kHz 40 25 10 65 80 µV dB dB mW 1.5 0.1 1.5 Limit (Note 7) 3 2.0 3 Units (Limits) mA (max) µA (max) mA (max)
Electrical Characteristics VDD = 3.0V (Notes 1, 2)
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