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부품번호 | LM49321 기능 |
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기능 | Audio Sub-System | ||
제조업체 | National Semiconductor | ||
로고 | |||
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www.DataSheet4U.com
LM49321
August 31, 2009
Audio Sub-System with Stereo DAC, Mono Class AB
Loudspeaker Amplifier, OCL/SE Stereo Headphone Output
and RF Suppression
General Description
The LM49321 is an integrated audio sub-system designed for
mono voice, stereo music cell phones connecting to base
band processors with mono differential analog voice paths.
Operating on a 3.3V supply, it combines a mono speaker am-
plifier delivering 520mW into an 8Ω load, a stereo headphone
amplifier delivering 36mW per channel into a 32Ω load, and
a mono earpiece amplifier delivering 55mW into a 32Ω load.
The headphone amplifier can be configured for output capac-
itor-less (OCL) or single-ended (SE) mode. It integrates the
audio amplifiers, volume control, mixer, and power manage-
ment control all into a single package. In addition, the
LM49321 routes and mixes the single-ended stereo and dif-
ferential mono inputs into multiple distinct output modes. The
LM49321 features an I2S serial interface for full range audio
and an I2C or SPI compatible interface for control. The full
range music path features an SNR of 85dB with up to 192kHz
playback.
Boomer audio power amplifiers are designed specifically to
provide high quality output power with a minimal amount of
external components.
Key Specifications
■ POUT LS, 8Ω, 3.3V, 1% THD+N
■ POUT HP, 32Ω, 3.3V, 1% THD+N
■ POUT Mono Earpiece, 32Ω
1% THD+N
■ Shutdown current
■ SNR (DAC + Amplifier)
520mW (typ)
36mW (typ)
55mW (typ)
0.6µA (typ)
85dB (typ)
Features
■ 18-bit stereo DAC with up to 192kHz sampling rate
■ Multiple distinct output modes
■ Mono class AB speaker amplifier
■ Stereo OCL/SE headphone amplifier
■ Mono earpiece amplifier
■ Differential mono analog input
■ Single-ended analog inputs
■ Independent loudspeaker, headphone and mono earpiece
volume controls
■ I2C/SPI (selectable) compatible interface
■ Ultra low shutdown current
■ Click and Pop Suppression circuit
Applications
■ Cell Phones
■ PDAs
■ Laptop computers
■ Portable devices
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2009 National Semiconductor Corporation 300618
www.national.com
www.DataShCeeot4Un.cnomection Diagrams
36 – Bump Micro SMD
36 – Bump Micro SMD
Top Marking Drawing
30061858
Top View (Bump Side Down)
Order Number LM49321RL
See NS Package Number RLA36LVA
Top View
XY — 2 Digit Date Code
TT — Die Traceability
G — Boomer Family
K9 — LM49321RL
30061802
www.national.com
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4페이지 wwSwy.mDabtoaSl heet4U.com Parameter
XTALK
TWU
CMRR
Crosstalk
Wake-Up Time
Common-Mode Rejection Ratio
Conditions
Headphone; PO = 10mW, f = 1kHz; OCL
CB = 2.2μF, CD_6 = 0
CB = 2.2μF, CD_6 = 1
f = 217Hz, VRMS = 200mVPP
LM49321
Typical Limits
(Note 6) (Note 7)
–60
35
85
56
Units
(Limits)
dB
ms
ms
dB
Audio Amplifier Electrical Characteristics AVDD = 5.0V, DVDD = 3.3V (Note 1, Note
2)
The following specifications apply for the circuit shown in Figure 1 with all programmable gain set at 0dB, unless otherwise specified.
Limits apply for TA = 25°C.
Symbol
Parameter
Conditions
LM49321
Typical Limits
(Note 6) (Note 7)
Units
(Limits)
VIN = 0, No Load
All Amps On + DAC, OCL (Note 10)
17.5
mA (max)
Headphone Mode Only, OCL, DAC Off
5.8
mA (max)
IDD Supply Current
Headphone Mode Only, OCL, DAC Off
STEREO_OUTPUT_ONLY = 1,
STEREO_INPUT_ONLY = 1
Headphone Mode Only, OCL, DAC On,
OSR = 64, DAC_INPUT_ONLY = 1
STEREO_OUTPUT_ONLY = 1
5.5
9.5
mA
mA
Mono Loudspeaker Mode Only (Note 10)
11.6
mA
Mono Earpiece Mode Only (Note 10)
5
mA
DAC Off, All Amps On (OCL) (Note 10)
12.9
mA
ISD Shutdown Current
(Note 8)
Speaker; THD = 1%;
f = 1kHz, 8Ω BTL
1.6 μA
1.25 mW
PO Output Power
Headphone; THD = 1%;
f = 1kHz, 32Ω SE
80 mW
Earpiece; THD = 1%;
f = 1kHz, 32Ω BTL
175 mW
VFS DAC
Full Scale DAC Output
Speaker; PO = 500mW;
f = 1kHz, 8Ω BTL
2.4
0.03
VRMS
%
THD+N
Total Harmonic Distortion + Noise Headphone; PO = 30mW;
f = 1kHz, 32Ω SE
0.01 %
Earpiece; PO = 40mW;
f = 1kHz, 32Ω BTL
0.04 %
Speaker
10 mV
VOS Offset Voltage
Earpiece
HP (OCL)
8 mV
8 mV
∈O
PSRR
XTALK
TWU
Output Noise
Power Supply Rejection Ratio
Crosstalk
Wake-Up Time
A-weighted; 0dB gain;
f = 217Hz; Vripple = 200mVP-P
CB = 2.2μF
Headphone; PO= 15mW, f = 1kHz; OCL
CB = 2.2μF, CD_6 = 0
CB = 2.2μF, CD_6 = 1
Table 1
Table 3
–56
45
130
dB
ms
ms
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부품번호 | 상세설명 및 기능 | 제조사 |
LM49321 | Audio w/Stereo DAC Mono AB Loudspkr Amp OCL/SE Stereo Hdphone RF Supp (Rev. C) | Texas Instruments |
LM49321 | Audio Sub-System | National Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |