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LM49450 Scheda tecnica(PDF) 2 Page - Texas Instruments

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Il numero della parte LM49450
Spiegazioni elettronici  Boomer I2S Input, 2.5W/Channel, Low EMI, Stereo, Class D Audio Sub-System with Ground Referenced Headphone Amplifier, 3D Enhancement, and Headphone Sense
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Produttore elettronici  TI [Texas Instruments]
Homepage  http://www.ti.com
Logo TI - Texas Instruments

LM49450 Scheda tecnica(HTML) 2 Page - Texas Instruments

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REF
CPGND
I
2
C
INTERFACE
I2C
BUS
CS
CS
VDD
MCLK
I2S_CLK
I2S_SDI
I2S_WS
SDA
SCL
DGND
HPR
HPL
LSGND
RLS-
RLS+
LLS-
LLS+
LSVDD
LSVDD
VDD
HPS
CREF
CLASS D
CLASS D
CLASS
AB
CLASS
AB
INL
INR
24-BIT
STEREO
DAC
32-STEP
VOLUME
CONTROL
CHARGE PUMP
C1
C1P
C1N
HPVDD
HPGND
CS
CPVDD
CPVDD
C2
HPVSS
L
R
OSCILLATOR
HPVDD
I
2
S
INTERFACE
3D
PROCESSOR
CS
BYPASS
CBYPASS
GND
IOVDD
DVDD
1.8V to 4.5V
2.7V to 4.5V
IOVDD
DVDD
2.7V to 5.5V
LM49450
SNAS440D – FEBRUARY 2008 – REVISED MAY 2013
www.ti.com
DESCRIPTION (CONTINUED)
The filterless Class D amplifiers deliver 1.25W/channel into an 8
Ω load with <1% THD+N with a 5V supply. The
LM49450 offers two logic selectable modulation schemes, fixed frequency mode, and an EMI reducing spread
spectrum mode. The 36mW/channel headphone drivers feature TI’s ground referenced architecture that creates
a ground-referenced output from a single supply, eliminating the need for bulky and expensive DC-blocking
capacitors, saving space and minimizing system cost. A headphone sense input (HPS) automatically detects the
presence of a headphone, and configures the device accordingly.
The LM49450 stereo, 24-bit DAC supports a wide range of sample rates (including 192kHz, 96kHz, 48kHz, and
44.1kHz). The digital audio signal path features better than 100dB SNR, and low 0.05% THD+N when measured
at the headphone outputs. The flexible 3-wire I2S interface supports left or right justified audio data.
The LM49450 features separate 32-step volume control for the headphones and speaker outputs. 3D
enhancement, mode selection, shutdown control, and volume are controlled through an I2C compatible interface.
Output short circuit and thermal overload protection prevent the device from being damaged during fault
conditions. Superior click and pop suppression eliminates audible transients on power-up/down and during
shutdown. The LM49450 is available in a space saving 32-pin WQFN package.
Typical Application
Figure 1. Typical Audio Amplifier Application Circuit
2
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Product Folder Links: LM49450


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