Datasheet

LM49450
www.ti.com SNAS440D –FEBRUARY 2008–REVISED MAY 2013
Electrical Characteristics V
DD
= LSV
DD
= 3.6V, HPV
DD
= CPV
DD
= 2.5V
(1)(2)
(continued)
The following specifications apply for Headphone: A
V
= 0dB, R
L(LS)
= 8Ω, R
L(HP)
= 32Ω, f = 1kHz, C
1
= C
2
= 2.2μF, unless
otherwise specified. Limits apply for T
A
= 25°C.
LM49450
Units
Symbol Parameter Conditions
(Limits)
Typical
(3)
Limit
(4)
Full-Scale Headphone Amplifier mV
RMS
V
OUT_FS
R
L
= No Load 942 850
Output Voltage (min)
t
ON
Turn-On Time 27 ms
t
OFF
Turn-Off Time 1 ms
HEADPHONE SENSE INPUT (HPS)
V
IH
Input High Voltage 1 V
V
IL
Input Low Voltage 0.6 V
DIGITAL INTERFACE
V
IH
Input High Voltage 2.8 V (min)
V
IL
Input Low Voltage 0.8 V (max)
V
OH
Output High Voltage 2 V (min)
V
OL
Output Low Voltage 1 V (max)
Electrical Characteristics V
DD
= LSV
DD
= 5.0V
(1)(2)
The following specifications apply for Headphone: A
V
= 0dB, R
L(LS)
= 8Ω, R
L(HP)
= 32Ω, f = 1kHz, unless otherwise specified.
Limits apply for T
A
= 25°C.
LM49450
Units
Symbol Parameter Conditions
(Limits)
Typical
(3)
Limit
(4)
SPEAKER AMPLIFIERS (Headphone Amplifiers Disabled, HPS = 0)
f
S
= 48kHz, DAC Active 14 18 mA (max)
I
DDLS
Analog Supply Current
Line Inputs Active 10.4 16 mA (max)
DAC Voltage 15 50 mV (max)
V
OS
Output Offset Voltage
AV = 0dB, Line Inputs Active 12 48 mV (max)
R
L
= 4Ω, f = 1kHz
THD+N = 1% 1.9 W
THD+N = 10% 2.5 W
P
OUT
Output Power
R
L
= 8Ω, f = 1kHz
THD+N = 1% 1.25 mW (min)
THD+N = 10% 1.54 W
P
O
= 635mW, f = 1kHz, R
L
= 8Ω
THD+N Total Harmonic Distortion DAC Active 0.06 %
Line Inputs Active 0.04 %
V
RIPPLE
= 200mV
P-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
P
O
= TBDmW, f = 1kHz
η Efficiency 80 %
R
L
= 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) R
L
is a resistive load in series with two inductors to simulate an actual speaker load. For R
L
= 8Ω, the load is 15µH + 8Ω +15µH. For R
L
= 4Ω, the load is 15µH + 4Ω + 15µH.
(3) Typical values represent most likely parametric norms at T
A
= +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.
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