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Details, datasheet, quote on part number:LM4910
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| Part: | LM4910 |
| Category: | Multimedia => Audio => Amplifiers => Preamplifiers => Headphone Amplifiers |
| Description: | LM4910 - LM4910 Output Capacitor-less Stereo 35mW Headphone Amplifier, Package: Llp, Pin Nb=8 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4910 datasheet File size : 849 kB |
| Request For quote: | Find where to buy LM4910
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Datasheet text preview:
LM4910 Output Capacitor-less Stereo 35mW Headphone Amplifier
February 2003
LM4910 Output Capacitor-less Stereo 35mW Headphone Amplifier
General Description
The LM4910 is an audio power amplifier primarily designed for headphone applications in portable device applications. It is capable of delivering 35mW of continuous average power to a 32 load with less than 1% distortion (THD+N) from a 3.3VDC power supply. The LM4910 utilizes a new circuit topology that eliminates output coupling capacitors and half-supply bypass capacitors (patent pending). The LM4910 contains advanced pop & click circuitry which eliminates noises caused by transients that would otherwise occur during turn-on and turn-off. Boomer audio power amplifiers were designed specifically to provide high quality output power with a minimal amount of external components. Since the LM4910 does not require any output coupling capacitors, half-supply bypass capacitors, or bootstrap capacitors, it is ideally suited for low-power portable applications where minimal space and power consumption are primary requirements. The LM4910 features a low-power consumption shutdown mode, activated by driving the shutdown pin with logic low. Additionally, the LM4910 features an internal thermal shutdown protection mechanism. The LM4910 is also unity-gain stable and can be configured by external gain-setting resistors.
Key Specifications
n PSRR at f = 217Hz n Power Output at VDD = 3.3V, RL = 32, and 1% n Shutdown Current 65dB (typ) THD 35mW (typ) 0.1µA (typ)
Features
n Eliminates headphone amplifier output coupling capacitors (patent pending) n Eliminates half-supply bypass capacitor (patent pending) n Advanced pop & click circuitry eliminates noises during turn-on and turn-off n Ultra-low current shutdown mode n Unity-gain stable n 2.2V - 5.5V operation n Available in space-saving MSOP, LLP, and SOIC packages
Applications
n n n n Mobile Phones PDAs Portable eletronics devices Portable MP3 players
Typical Application
20030565
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS200305
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LM4910
Connection Diagrams
MSOP/SO Package
20030502
Top View Order Number LM4910MM or LM4910MA See NS Package Number MUA08A or M08A MSOP Marking
20030566
Top View G - Boomer Family C2 - LM4910MM SO Marking
20030567
Top View TT - Die Traceability Bottom 2 lines - Part Number LLP Package
20030595
Top View Order Number LM4910LQ See NS package Number LQB08A
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LM4910
Absolute Maximum Ratings
(Note 2)
JC (MSOP) JA (MSOP) JC (SOP) JA (SOP) JC (LQ) JA (LQ)
56°C/W 190°C/W 35°C/W 150°C/W 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 (Note 9) Storage Temperature Input Voltage Power Dissipation (Note 3) ESD Susceptibility Pin 6 (Note 10) ESD Susceptibility (Note 4) ESD Susceptibility (Note 5) Junction Temperature Thermal Resistance 6.0V -65°C to +150°C -0.3V to VDD + 0.3V Internally Limited 10kV 2000V 200V 150°C
Operating Ratings
Temperature Range TMIN TA TMAX Supply Voltage (VDD) -40°C T
A
85°C
2.2V VCC 5.5V
Electrical Characteristics VDD = 3.3V (Notes 1, 2)
Symbol Parameter
The following specifications apply for VDD = 3.3V, AV = 1, and 32 load unless otherwise specified. Limits apply to TA = 25°C. Conditions LM4910 Typ (Note 6) IDD ISD VOS PO THD+N Quiescent Power Supply Current Standby Current Output Offset Voltage Output Power THD = 1% (max); f = 1kHz Total Harmonic Distortion + Noise PO = 30mWrms; f = 1kHz VRIPPLE = 200mVp-p sinewave Input terminated with 10 to ground VIN = 0V, 32 Load VSHUTDOWN = GND 3.5 0.1 5 35 0.3 65 (f = 217Hz) 65 (f = 1kHz) 1.5 0.4 Limit (Notes 7, 8) 6 1.0 30 30 Units (Limits)
mA (max) µA (max) mV (max) mW (min) %
PSRR
Power Supply Rejection Ratio
dB
VIH VIL
Shutdown Input Voltage High Shutdown Input Voltage Low
V (min) V (max)
Electrical Characteristics VDD = 3V (Notes 1, 2)
Symbol Parameter
The following specifications apply for VDD = 3V, AV = 1, and 32 load unless otherwise specified. Limits apply to TA = 25°C. Conditions LM4910 Typ (Note 6) IDD ISD VOS PO THD+N Quiescent Power Supply Current Standby Current Output Offset Voltage Output Power THD = 1% (max); f = 1kHz Total Harmonic Distortion + Noise PO = 25mWrms; f = 1kHz VRIPPLE = 200mVp-p sinewave Input terminated with 10 to ground VIN = 0V, 32 Load VSHUTDOWN = GND 3.3 0.1 5 30 0.3 65 (f = 217 Hz) 65 (f = 1kHz) 1.5 0.4 Limit (Notes 7, 8) 6 1.0 30 25 Units (Limits)
mA (max) µA (max) mV (max) mW (min) %
PSRR
Power Supply Rejection Ratio
dB
VIH VIL
Shutdown Input Voltage High Shutdown Input Voltage Low
V (min) V (max)
3
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