Datasheet

LM49450
SNAS440D –FEBRUARY 2008–REVISED MAY 2013 www.ti.com
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)
Input Referred, A-weighted
DAC Active, Internal Reference 43.5 μV
ε
OS
Output Noise
DAC Active, External Reference 45.4 μV
Line Inputs Active 40 μV
t
ON
Turn-On Time 27 ms
t
OFF
Turn-Off Time 1 ms
HEADPHONE AMPLIFIERS (Speaker Amplifiers Disabled, HPS = 1)
f
S
= 48kHz, DAC active 7.2 8.25 mA (max)
I
DDHP
Analog Supply Current
Line Inputs Active 5.3 6.5 mA (max)
DAC active, A
V
= –6dB 7 mV
V
OS
Output Offset Voltage 30
Line Inputs Active, , A
V
= –6dB 5 mV (max)
R
L
= 16Ω, f = 1kHz
THD+N = 1%, Single Channel 66 mW
THD+N = 1%, Two Channels in
34 mW
Phase
P
O
Output Power
R
L
= 32Ω, f = 1kHz
THD+N = 1%, Single Channel 49 42 mW (min)
THD+N = 1%, Two Channels in
36 27 mW (min)
Phase
f = 1kHz, DAC Active
THD+N Total Harmonic Distortion R
L
= 16Ω, P
O
= 5mW 0.05 %
R
L
= 32Ω, P
O
= 5mW 0.03 %
V
RIPPLE
= 200mV
P-P
, f = 1kHz
DAC Active, Internal Reference 71.2 56 dB (min)
PSRR Power Supply Rejection Ratio
DAC Active, External Reference 71.3 dB
Line Inputs Active 76.9 dB
P
O
= 5mW, f = 1kHz, R
L
= 32Ω
DAC Active, 82 dB
Line Inputs Active 79 dB
Xtalk Crosstalk
P
O
= 5mW, f = 10kHz, R
L
= 32Ω
DAC Active, 78 dB
Line Inputs Active 76 dB
P
O
= 5mW, f = 1kHz, A-weighted
DAC Active, Internal Reference 99 dB
SNR Signal to Noise Ratio
DAC Active, External Reference 102 dB
Line Inputs Active 98 dB
Maximum Gain Setting, Line Inputs 17.0 dB (min)
17.8
Active 18.5 dB (max)
A
V
Digitally Controlled Gain Level
Minimum Gain Setting, Line Inputs –56 dB (min)
–53.8
Active –52 dB (max)
Mute Mute Attenuation Line Inputs Active –102 dB
Channel-to-Channel Gain
ΔA
CH-CH
0.3 dB
Matching
Input Referred, A-weighted
DAC Active, Internal Reference 10 μV
ε
OS
Output Noise
DAC Active, External Reference 10 μV
Line Inputs Active 10 μV
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