|
|
PDF LM49250 Data sheet ( Hoja de datos )
| Número de pieza | LM49250 | |
| Descripción | Enhanced Emissions Suppression Stereo Class D Audio Sub-System | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LM49250 (archivo pdf) en la parte inferior de esta página. Total 36 Páginas | ||
|
No Preview Available !
December 15, 2008
www.DataSheet4U.com
LM49250
Enhanced Emissions Suppression Stereo Class D Audio
Sub-System with Ground Referenced Headphone
Amplifier and Mono Earpiece
General Description
The LM49250 is a fully integrated audio subsystem designed
for stereo cell phone applications. The LM49250 combines a
2.4W/Ch stereo class D speaker amplifiers with a 45mW/Ch
stereo ground referenced headphone amplifier, a class AB
earpiece amplifier, National 3D enhancement, volume con-
trol, and an input mixer into a single device. The filterless class
D amplifiers deliver 1.2W/Ch into an 8Ω load with <1% THD
+N from a 5V supply.
The LM49250 features a new circuit technology that utilizes
a charge pump to generate a negative supply voltage. This
allows the headphone outputs to be biased about ground,
thereby eliminating the output-coupling capacitors.
For improved noise immunity, the LM49250 features fully dif-
ferential left, right and mono inputs. The three inputs can be
mixed/multiplexed to any output combination of the loud-
speaker, headphone or earpiece amplifiers. The left and right
differential inputs can be used as separate single-ended in-
puts, mixing multiple stereo audio sources. The mixer, volume
control, and device mode select are controlled through an
I2C compatible interface.
Output short circuit and thermal overload protection prevent
the device from being damaged during fault conditions. Su-
perior click and pop suppression eliminates audible transients
on power-up/down and during shutdown.
Key Specifications
■ Power Output at VDD = 5V
Speaker:
RL = 4Ω, THD+N ≤ 1%
RL = 4Ω, THD+N ≤ 10%
RL = 8Ω, THD+N ≤ 1%
Headphone:
RL = 16Ω, THD+N ≤ 1%
RL = 32Ω, THD+N ≤ 1%
Earpiece:
RL = 16Ω, THD+N ≤ 1%
RL = 32Ω, THD+N ≤ 1%
■ Shutdown Current
■ Efficiency at 5V, 1W into 8Ω
■ Efficiency at 3.6V, 500mW into 8Ω
1.97W/Ch
2.4W/Ch
1.2W/Ch
41mW/Ch
45mW/Ch
170mW
90mW
0.1μA
87%
85%
Features
■ Output Short Circuit Protection
■ Thermal Overload Protection
■ Stereo filterless Class D operation
■ Spread spectrum modulation
■ Ground referenced Headphone Drivers
■ I2C Control Interface
■ 32-step input volume control
■ Output volume control
■ Minimum external components
■ Click and Pop suppression
■ Micro-power shutdown
■ Available in space-saving 36–bump µSMD package
■ Single supply operation
■ RF suppression
Applications
■ Mobile phones
■ Portable Navigation Devices
■ Portable Media Players
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2008 National Semiconductor Corporation 300166
www.national.com
1 page  
Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Thermal Resistance
θJA (RLA36CCA))
Operating Ratings
www.Data4S4h.e4e°Ct4/WU.com
Supply Voltage (Note 1)
Storage Temperature
Input Voltage
Power Dissipation (Note 3)
ESD Rating (Note 4)
ESD Rating (Note 5)
Junction Temperature
6.0V
−65°C to +150°C
−0.3V to VDD +0.3V
Internally Limited
2000V
200V
150°C
Temperature Range
TMIN ≤ TA ≤ TMAX
Supply Voltage
(VDD, VDD(LS), VDD(CP) )
I2C Voltage (I2CVDD)
−40°C ≤ TA ≤ +85°C
2.7V ≤ VDD ≤ 5.5V
1.7V ≤ I2CVDD≤ 5.5V
VDD = VDD(CP) = VDD(LS)
I2CVDD ≤ VDD
Electrical Characteristics (Notes 1, 2) The following specifications apply for VDD = VDD(LS) = VDD(CP) = 3.6V,
all selectable gains = 0dB, RL(LS) = 8Ω (Note 8), RL(HP) = 32Ω, RL(EP) = 32Ω, f = 1kHz and the conditions shown in the "Typical
Application Circuit” unless otherwise specified. Limits apply for TA = 25°C.
Symbol
Parameter
Conditions
LM49250
Typical
Limit
(Note 6)
(Note 7)
Units
(Limits)
VDD = 3.0V, No Load, Spread Spectrum on
Loudspeaker (LS) Mode
Stereo
5.6
Mono
3.9
mA
mA
Headphone (HP) Mode
Stereo
Mono
5.5
4.0
mA
mA
Earpiece (EP) Mode
2.5
mA
Stereo LS + Stereo HP Mode
9.0
mA
IDD Supply Current
VDD = 3.6V, No Load, Spread Spectrum on
Loudspeaker (LS) Mode
Stereo
6.1
Mono
4.1
Headphone (HP) Mode
Stereo
Mono
5.6
4.1
8.0 mA (max)
mA
7.5 mA (max)
mA
Earpiece (EP) Mode
2.6 3.4 mA (max)
Stereo LS + Stereo HP Mode
9.4 12.5 mA (max)
VDD = 5.0V, No Load, Spread Spectrum on
Loudspeaker (LS) Mode
Stereo
7.1
Mono
4.8
8.8 mA (max)
mA
Headphone (HP) Mode
Stereo
Mono
6.0 7.7 mA (max)
4.4 mA
Earpiece (EP) Mode
3.0 3.9 mA (max)
Stereo LS + HP Mode
10.5 13.8 mA (max)
ISD Shutdown Supply Current
0.1 2 µA (max)
Differential inputs
VOS Output Offset Voltage
Headphone (output mode 2) 3.8 5.0 mV (max)
Speaker (output mode 2)
10 45 mV (max)
Earpiece (output mode 1)
1.5 6.0 mV (max)
5 www.national.com
5 Page 
THD+N vs Frequency
Single-ended Input, Speaker Mode 2
VDD = 5V, POUT = 800mW/Ch, RL = 8Ω
DifferentTiaHlDIn+pNuvt,sHFeraedqpuhenocnyewMwowde.D2ataSheet4U.com
VDD = 3.6V, POUT = 30mW/Ch, RL = 16Ω
300166m4
THD+N vs Frequency
Differential Input, Headphone Mode 2
VDD = 3.6V, POUT = 30mW/Ch, RL = 32Ω
300166n4
THD+N vs Frequency
Single-ended Input, Headphone Mode 2
VDD = 3.6V, POUT = 30mW, RL = 16Ω
300166n5
THD+N vs Frequency
Single-ended Input, Headphone Mode 2
VDD = 3.6V, POUT = 30mW, RL = 32Ω
300166n8
THD+N vs Output Power
Differential Input, Speaker Mode 2
AV = 0dB, RL = 4Ω, f = 1kHz
300166n9
11
300166l2
www.national.com
11 Page | ||
| Páginas | Total 36 Páginas | |
| PDF Descargar | [ Datasheet LM49250.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LM4925 | 2 Cell/ Single Ended Output 40mW Stereo Headphone Audio Amplifier | National Semiconductor |
| LM49250 | Emission Supprssion Stereo Class D Audio w/Gnd Ref Headphone Amp Mono Earpiece (Rev. C) |  Texas Instruments |
| LM49250 | Enhanced Emissions Suppression Stereo Class D Audio Sub-System | National Semiconductor |
| LM49251 | Stereo Audio w/Class G Headphone Amp Class D Speaker Amp w/Speaker Protection (Rev. A) | Texas Instruments |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |