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)
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)
DV
DD
= 2.7V, f
S
= 48kHz,
DI
DD
Digital Core Supply Current 9 11.2 mA (max)
f
MCLK
= 12.28MHz
Digital Current 0.03 1 μA (max)
I
SD
Shutdown Supply Current
Analog Current 0.02 1 μA (max)
SPEAKER AMPLIFIERS (Headphone Amplifiers Disabled, HPS = 0)
f
S
= 48kHz, DAC Active, No Load 9.8 13 mA (max)
I
DDLS
Analog Supply Current
Line Inputs Active, No Load 7 10 mA (max)
DAC Active 8 45 mV (max)
V
OS
Output Offset Voltage
Line Inputs Active 8 mV (max)
R
L
= 4Ω, f = 1kHz
THD+N = 1% 1 W
THD+N = 10% 1.2 W
P
OUT
Output Power
R
L
= 8Ω, f = 1kHz
THD+N = 1% 625 525 mW (min)
THD+N = 10% 725 W
P
O
= 300mW, f = 1kHz, R
L
= 8Ω
THD+N Total Harmonic Distortion DAC Active 0.06 %
Line Inputs Active 0.07 %
V
RIPPLE
= 200mV
P-P
, f = 1kHz
DAC Active, Internal Reference 59 45 dB (min)
PSRR Power Supply Rejection Ratio
DAC Active, External Reference 62 dB
Line Inputs Active 67 dB
P
O
= 650, f = 1kHz
η Efficiency 87 %
R
L
= 8Ω
P
O
= 500mW, f = 1kHz, R
L
= 8Ω
DAC Active, 81 dB
Line Inputs Active 77 dB
Xtalk Crosstalk
P
O
= 500mW, f = 10kHz, R
L
= 8Ω
DAC Active, 60 dB
Line Inputs Active 60 dB
P
O
= 500mW, f = 1kHz, A-weighted
DAC Active, Internal Reference 89 dB
SNR Signal to Noise Ratio
DAC Active, External Reference 92 dB
Line Inputs Active 90 dB
Maximum Gain Setting, Line Inputs 22.5 dB (min)
23.6
Active 24.1 dB (max)
A
V
Digitally Controlled Gain Level
Minimum Gain Setting, Line Inputs –49 dB (min)
–48
Active –46 dB (max)
Mute Mute Attenuation Line Inputs Active –91 dB
Channel-to-Channel Gain
ΔA
CH-CH
0.3 dB
Matching
(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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