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LM4681 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4681
Description  10 Watt Stereo CLASS D Audio Power Amplifier with Stereo Headphone Amplifier and I2C/SPI Volume Control
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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Electrical Characteristics (Notes 1, 2, 7) (Continued)
The following specifications apply for V
DD = 12V, I
2CV
DD = 5V, RL =8
Ω, LC filter values as shown in Figure 1, unless other-
wise specified. Limits apply for T
A = 25˚C.
Symbol
Parameter
Conditions
LM4681
Units
Typical
Limit
PSRR
Power Supply Rejection Ratio
V
RIPPLE = 200mVP-P,
C
BYPASS1 = 10µF,
input referred
f = 50Hz
f = 60Hz
f = 100Hz
f = 120Hz
f = 1kHz
82
84
92
95
95
dB
Headphone Amplifiers
P
O
Maximum Power Output Per
Channel
THD+N
≤ 1%, R
L =32
Ω,
f
IN = 1kHz
94
70
mW
(min)
THD+N
Distortion + Noise
P
O = 20mW, RL =32
Ω,
f
IN = 1kHz
0.02
%
V
NOISE
Output Noise Voltage, RMS
R
IN =50
Ω,C
IN = 1µF,
BW = 20Hz to 20kHz, R
L =32
A-weighted, Input referred
22
µV
PSRR
Power Supply Rejection Ratio
(Referred to Input)
200mV, 1kHz, V
IN =0,RL =32
77
dB
Electrical Characteristics for Volume Control (Notes 1, 2)
The following specifications apply for V
DD = 12V. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4681
Units
(Limits )
Typical
(Note 8)
Limit
(Note 7)
C
RANGE
Gain Range
Digital Code = Full Scale, No Load
Power Amplifier
Headphone Amplifier
30
13
29
12
dB (min)
dB (min)
Digital Code = +1LSB, No Load
Power Amplifier
Headphone Amplifier
–48
–65
–46
–63
dB (min)
dB (min)
A
M
Mute Gain
Digital Code = 0, No Load
Power Amplifier
Headphone Amplifier
–76
–74
–74
dB (max)
dB (max)
Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. “Operating Ratings” indicate conditions for which the device
is functional, but do not guarantee specific performance limits. “Electrical Characteristics” state DC and AC electrical specifications under particular test conditions
which guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where
no limit is given, however, the typical value is a good indication of device performance.
Note 3: For operating at case temperatures above 25˚C, the device must be derated based on a 150˚C maximum junction temperature and a thermal resistance
of
θJA = 80˚C/W (junction to ambient).
Note 4: Human body model, 100pF discharged through a 1.5k
Ω resistor.
Note 5: Machine Model 220pF − 240pF discharged through all pins.
Note 6: The operating junction temperature maximum is 150˚C.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Typicals are measured at 25˚C and represent the parametric norm.
www.national.com
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