Datasheet

LM49370
SNAS356D –FEBRUARY 2007–REVISED MARCH 2012 www.ti.com
Electrical Characteristics
(1)(2)
(continued)
Unless otherwise stated PLL_V
DD
= 3.3V, D_V
DD
= 3.3V, BB_V
DD
= 1.8V, A_V
DD
= 3.3V, LS_V
DD
= 3.3V. The following
specifications apply for the circuit shown in Figure 2 unless otherwise stated. Limits apply for 25°C.
LM49370
Symbol Parameter Conditions Units
Limit
(4)
Typical
(3)
(5)
HEADPHONE AMPLIFIER
mW
32Ω load, 3.3V, SE 33 25
(min)
16Ω load, 3.3V, SE 52 mW
32Ω load, 3.3V, OCL, VCM = 1.5V 31 mW
P
HP
Headphone Power
32Ω load, 3.3V, OCL, VCM = 1.2V 20 mW
16Ω load, 3.3V, OCL, VCM = 1.5V 50 mW
16Ω load, 3.3V, OCL, VCM = 1.2V 32 mW
AUX inputs terminated
C
BYPASS
= 1.0 µF
V
RIPPLE
= 200 mV
P-P
f
RIPPLE
= 217 Hz
Power Supply Rejection Ratio
SE Mode 60 dB
PSRR
HP
(Headphones)
OCL Mode
68 55 dB(min)
VCM = 1.2V
OCL Mode
65 dB
VCM = 1.5V
From 0dB Analog AUX input
A-weighted
SE Mode 98 dB
SNR
HP
Signal to Noise Ratio
OCL Mode
97 dB
VCM = 1.2V
OCL Mode
96 dB
VCM = 1.5V
HP
THD+N
Headphone Harmonic Distortion 32Ω load, 3.3V, P
O
= 7.5mW 0.05 %
e
N
Output Noise A-weighted 12 µV
Stereo Channel-to-Channel Gain
ΔA
CH-CH
0.3 dB
Mismatch
SE Mode 61 dB
X
TALK
Stereo Crosstalk
OCL Mode 71 dB
V
OS
Offset Voltage 8 mV
EARPIECE AMPLIFIER
mW
32Ω load, 3.3V 115 100
(min)
P
EP
Earpiece Power
16Ω load, 3.3V 150 mW
CP_IN terminated
C
BYPASS
= 1.0 µF
PSRR
EP
Power Supply Rejection Ratio (Earpiece) 76 dB
V
RIPPLE
= 200 mV
P-P
F
RIPPLE
= 217 Hz
SNR
EP
Signal to Noise Ratio From 0dB Analog AUX input, A-weighted 93 dB
EP
THD+N
Earpiece Harmonic Distortion 32Ω load, 3.3V, P
O
= 50mW 0.04 %
e
N
Output Noise A-weighted 41 µV
V
OS
Offset Voltage 8 mV
AUXOUT AMPLIFIER
THD+N Total Harmonic Distortion + Noise V
O
= 1V
RMS
, 5kΩ load 0.02 %
CP_IN terminated
C
BYPASS
= 1.0μF
PSRR Power Supply Rejection Ratio 86 dB
V
RIPPLE
= 200mVPP
f
RIPPLE
= 217Hz
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