|
Details, datasheet, quote on part number:LM4914
| |
Datasheet text preview:
LM4914 1W Monaural, 85mW Stereo Headphone Audio Amplifier
March 2003
LM4914 1W Monaural, 85mW Stereo Headphone Audio Amplifier
General Description
The unity-gain stable LM4914 is both a mono differential output (for bridge-tied loads, or BTL) audio power amplifier and a single-ended (SE) stereo headphone amplifier. Operating on a single 5V supply, the mono BTL mode delivers 1W into an 8 load. In SE stereo mode, the amplifier delivers 85mW to 32 loads. The LM4914 features circuitry that suppresses output transients ("clicks and pops"). The LM4914 is designed for notebook and other handheld portable applications. It delivers high quality output power from a surface-mount package and requires few external components. The LM4914 is pin and functionally compatible with the TPA0253. Other features include an active-low micro-power shutdown mode and thermal shutdown protection. The LM4914 is available in a space efficient 10-lead exposed-DAP TSSOP package.
j Micro-power shutdown supply current j PSRR (f = 1kHz)
0.03µA (typ) 52dB (typ) 52dB (typ)
VDD = at 3.0V, BTL Mode VDD = at 5.0V, BTL Mode
Features
n n n n n n n n Advanced "click and pop" suppression circuitry Stereo headphone amplifier mode Low current micro-power shutdown mode Thermal shutdown protection circuitry 2.5V to 5.5V operation Unity-gain stable Gain set with external resistors Space-saving exposed-DAP TSSOP package
Applications
n PDAs n Cellular phones n Handheld portable electronic devices
Key Specifications
j BTL output power (RL = 8)
VDD = at 3.0V, THD = 0.1% VDD = at 5.0V, THD = 0.1%
j SE output power (RL = 32)
330mW (typ) 1W (typ) 30mW (typ) 85mW (typ)
VDD = at 3.0V, THD = 0.1% VDD = at 5.0V, THD = 0.1%
Connection Diagram
200634A0
Top View Order Number LM4914MH See NS package Number MXF10A
Boomer ® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS200634
www.national.com
LM4914
Typical Application
200634C3
FIGURE 1. Typical Audio Amplifier Application Circuit
www.national.com
2
LM4914
Absolute Maximum Ratings
(Note 3)
Infrared (15sec) See AN-450 "Surface Mounting and their Effects on Product Reliability" for other methods of soldering surface-mount devices. Thermal Resistance JA (typ) - MXF10A
220°C
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 Solder Information Small Outline Package Vapor Phase (60sec) 215°C 6.0V -65°C to +150°C -0.3V to VDD +0.3V Internally Limited 2000V 200V 150°C
46°C/W
Operating Ratings
Temperature Range TMIN TA TMAX Supply Voltage -40°C TA 85°C 2.5V VDD 5.5V
Electrical Characteristics for Entire Amplifier (VDD = 5V) (Note 3) The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for TA = 25°C.
LM4914 Symbol VDD IDD ISD VOS PSRR HP-SVIH HP-SVIL SDVIH SDVIL Parameter Supply Voltage Quiescent Power Supply Current VIN = 0V, IO = 0A, No Load 4 0.03 7 VDD = 5V, CBYPASS = 0.47µF, Vripple = 200mVp-p 1kHz sine wave RL = 8 52 BTL 60 SE 4.5 2.75 2.0 0.8 Conditions Typical (Note 8) Limit (Notes 9, 10) 2.5 5.5 6.5 5 30 Units (Limits) V (min) V (max) mA (max) µA (max) mV (max)
Shutdown Quiescent Power Supply VSHUTDOWN = GND Current Output Offset Voltage Power Supply Rejection Ratio HP-SENSE Logic-High Threshold Voltage HP-SENSE Logic-Low Threshold Voltage Shutdown Logic High Threshold Shutdown Logic LowThreshold
dB V (min) V (max) V (min) V (max)
3
www.national.com
|
|
