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Details, datasheet, quote on part number:LM4908MMX
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| Part: | LM4908MMX |
| Category: | Multimedia => Audio => Amplifiers => Power Amplifiers |
| Description: | 10kV Esd Rated, Dual 120mW Headphone Amplifier |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4908MMX datasheet File size : 958 kB |
| Request For quote: | Find where to buy LM4908MMX
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Datasheet text preview:
10kV ESD Rated, Dual 120 mW Headphone Amplifier
February 2004
LM4908 10kV ESD Rated, Dual 120 mW Headphone Amplifier
General Description
The LM4908 is a dual audio power amplifier capable of delivering 120mW per channel of continuous average power into a 16 load with 0.1% (THD+N) from a 5V power supply. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components using surface mount packaging. Since the LM4908 does not require bootstrap capacitors or snubber networks, it is optimally suited for low-power portable systems. The unity-gain stable LM4908 can be configured by external gain-setting resistors.
j Output power at 0.1% THD+N at 1kHz into 32
75mW (typ)
Features
n n n n n n Up to 10kV ESD protection on all pins MSOP, SOP, and LLP surface mount packaging Switch on/off click suppression Excellent power supply ripple rejection Unity-gain stable Minimum external components
Key Specifications
j THD+N at 1kHz at 120mW continuous average output power into 16 j THD+N at 1kHz at 75mW
Applications
n Headphone Amplifier n Personal Computers n Portable electronic devices 0.1% (typ)
continuous average output power into 32
0.1% (typ)
Typical Application
20075201
*Refer to the Application Information Section for information concerning proper selection of the input and output coupling capacitors.
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2004 National Semiconductor Corporation
DS200752
www.national.com
LM4908
Connection Diagrams
SOP (MA) and MSOP (MM) Package
20075202
Top View Order Number LM4908MA, LM4908MM See NS Package Number M08A, MUA08A LLP (LQ) Package
200752A2
Top View Order Number LM4908LQ See NS Package Number LQB08A
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LM4908
Absolute Maximum Ratings (Note 3)
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 4) ESD Susceptibility (Note 5) ESD Susceptibility (Note 6) Junction Temperature Soldering Information (Note 1) Small Outline Package Vapor Phase (60 seconds) Infrared (15 seconds) Thermal Resistance 215°C 220°C 6.0V -65°C to +150°C -0.3V to VDD + 0.3V Internally limited 10.0kV 500V 150°C
JC (MSOP) JA (MSOP) JC (SOP) JA (SOP) JC (LLP) JA (LLP) JA (LLP)
56°C/W 210°C/W 35°C/W 170°C/W 15°C/W 117°C/W (Note 9) 150°C/W (Note 10)
Operating Ratings
Temperature Range TMIN TA TMAX Supply Voltage -40°C T
A
85°C
2.0V VDD 5.5V
Note 1: See AN-450 "Surface Mounting and their Effects on Product Reliability" for other methods of soldering surface mount devices.
Electrical Characteristics (Notes 2, 3)
The following specifications apply for VDD = 5V unless otherwise specified, limits apply to TA = 25°C. Symbol Parameter Conditions LM4908 Typ (Note 7) VDD IDD Ptot VOS Ibias VCM GV Io RO VO PSRR Crosstalk THD+N Supply Voltage Supply Current Total Power Dissipation Input Offset Voltage Input Bias Current Common Mode Voltage Open-Loop Voltage Gain Max Output Current Output Resistance Output Swing Power Supply Rejection Ratio Channel Separation Total Harmonic Distortion + Noise RL = 32, 0.1% THD+N, Min RL = 32, 0.1% THD+N, Max Cb = 1.0µF, Vripple = 100mVPP, f = 40Hz RL = 32, f = 1kHz f = 1 kHz RL = 16, VO =3.5VPP (at 0 dB) RL = 32, VO =3.5VPP (at 0 dB) SNR fG Po Signal-to-Noise Ratio Unity Gain Frequency Output Power VO = 3.5Vpp (at 0 dB) Open Loop, RL = 5k THD+N = 0.1%, f = 1 kHz RL = 16 RL = 32 THD+N = 10%, f = 1 kHz RL = 16 RL = 32 CI Input Capacitance 157 99 3 mW mW pF 120 75 60 mW mW 0.05 66 0.05 66 100 25 % dB % dB dB MHz RL = 5k THD+N < 0.1 % VIN = 0V, IO = 0A VIN = 0V, IO = 0A VIN = 0V 1.6 8 5 10 0 4.3 67 70 0.1 .3 4.7 90 82 Limit (Note 8) 2.0 5.5 3.0 16.5 50 Units (Limits) V (min) V (max) mA (max) mW (max) mV (max) pA V V dB mA V dB dB
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