Datasheet

LM49450
SNAS440D –FEBRUARY 2008–REVISED MAY 2013 www.ti.com
Electrical Characteristics V
DD
= LSV
DD
= 5.0V
(1)(2)
(continued)
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)
P
O
= 500mW, f = 1kHz, R
L
= 8Ω
DAC Active, 74 dB
Line Inputs Active 79 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 88 dB
SNR Signal to Noise Ratio
DAC Active, External Reference 89 dB
Line Inputs Active 98 dB
Maximum Gain Setting, Line Inputs 22.5 dB (min)
24.2
Active 24.2 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 –92 dB
Channel-to-Channel Gain
ΔA
CH-CH
0.3 dB
Matching
Input Referred, A-weighted
DAC Active, Internal Reference 60 μV
ε
OS
Output Noise
DAC Active, External Reference 85 μV
Line Inputs Active 40 μV
t
ON
Turn-On Time 27 ms
t
OFF
Turn-Off Time 1 ms
Timing Characteristics
(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)
AUDIO INTERFACE TIMING
t
MCLKL
MCLK Pulse Width Low 16 ns (min)
t
MCLKH
MCLK Pulse Width High 16 ns (min)
t
MCLKY
MCLK Period 32 ns (min)
t
BCLKR
BCLK Rise Time 3 ns (max)
t
BCLKCF
BCLK Fall Time 3 ns (max)
t
BCLKDS
BCLK Duty Cycle 50 %
LRC Propagation Delay from ns (max)
t
DL
10
BCLK falling edge
DATA Setup Time to BCLK Rising 10 ns (min)
t
DST
Edge
(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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