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LM49450 Arkusz danych(PDF) 7 Page - Texas Instruments

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Numer części LM49450
Szczegółowy opis  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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Producent  TI [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI - Texas Instruments

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LM49450
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SNAS440D – FEBRUARY 2008 – REVISED MAY 2013
Electrical Characteristics VDD = LSVDD = 3.6V, HPVDD = CPVDD = 2.5V
(1)(2) (continued)
The following specifications apply for Headphone: AV = 0dB, RL(LS) = 8Ω, RL(HP) = 32Ω, f = 1kHz, C1 = C2 = 2.2μF, unless
otherwise specified. Limits apply for TA = 25°C.
LM49450
Units
Symbol
Parameter
Conditions
(Limits)
Typical(3)
Limit(4)
Full-Scale Headphone Amplifier
mVRMS
VOUT_FS
RL = No Load
942
850
Output Voltage
(min)
tON
Turn-On Time
27
ms
tOFF
Turn-Off Time
1
ms
HEADPHONE SENSE INPUT (HPS)
VIH
Input High Voltage
1
V
VIL
Input Low Voltage
0.6
V
DIGITAL INTERFACE
VIH
Input High Voltage
2.8
V (min)
VIL
Input Low Voltage
0.8
V (max)
VOH
Output High Voltage
2
V (min)
VOL
Output Low Voltage
1
V (max)
Electrical Characteristics VDD = LSVDD = 5.0V
(1) (2)
The following specifications apply for Headphone: AV = 0dB, RL(LS) = 8Ω, RL(HP) = 32Ω, f = 1kHz, unless otherwise specified.
Limits apply for TA = 25°C.
LM49450
Units
Symbol
Parameter
Conditions
(Limits)
Typical(3)
Limit(4)
SPEAKER AMPLIFIERS (Headphone Amplifiers Disabled, HPS = 0)
fS = 48kHz, DAC Active
14
18
mA (max)
IDDLS
Analog Supply Current
Line Inputs Active
10.4
16
mA (max)
DAC Voltage
15
50
mV (max)
VOS
Output Offset Voltage
AV = 0dB, Line Inputs Active
12
48
mV (max)
RL = 4Ω, f = 1kHz
THD+N = 1%
1.9
W
THD+N = 10%
2.5
W
POUT
Output Power
RL = 8Ω, f = 1kHz
THD+N = 1%
1.25
mW (min)
THD+N = 10%
1.54
W
PO = 635mW, f = 1kHz, RL = 8Ω
THD+N
Total Harmonic Distortion
DAC Active
0.06
%
Line Inputs Active
0.04
%
VRIPPLE = 200mVP-P, f = 1kHz
DAC Active, Internal Reference
60
dB
PSRR
Power Supply Rejection Ratio
DAC Active, External Reference
60
dB
Line Inputs Active
70
dB
PO = TBDmW, f = 1kHz
η
Efficiency
80
%
RL = 8Ω
(1)
The Electrical Characteristics tables list ensured specifications under the listed Recommended Operating Conditions except as
otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes. Typical specifications are estimations only and
are not ensured.
(2)
RL is a resistive load in series with two inductors to simulate an actual speaker load. For RL = 8Ω, the load is 15µH + 8Ω +15µH. For RL
= 4
Ω, the load is 15µH + 4Ω + 15µH.
(3)
Typical values represent most likely parametric norms at TA = +25ºC, and at the Recommended Operation Conditions at the time of
product characterization and are not ensured.
(4)
Datasheet min/max specification limits are specified by test or statistical analysis.
Copyright © 2008–2013, Texas Instruments Incorporated
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