LM4681 National Semiconductor, LM4681 Datasheet - Page 5

• Manufacturer Part Number: LM4681
• Description: Stereo CLASS D Audio Power Amplifier
• Manufacturer: National Semiconductor

C
A
Symbol
M
Symbol
PSRR
Headphone Amplifiers
P
THD+N
V
PSRR
RANGE
Electrical Characteristics
Electrical Characteristics for Volume Control
The following specifications apply for V
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 θ
Note 4: Human body model, 100pF discharged through a 1.5kΩ 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.
The following specifications apply for V
wise specified. Limits apply for T
O
NOISE
JA
= 80˚C/W (junction to ambient).
Gain Range
Mute Gain
Power Supply Rejection Ratio
Maximum Power Output Per
Channel
Distortion + Noise
Output Noise Voltage, RMS
Power Supply Rejection Ratio
(Referred to Input)
Parameter
Parameter
A
= 25˚C.
DD
DD
(Notes 1, 2, 7) (Continued)
= 12V. Limits apply for T
= 12V, I
Digital Code = Full Scale, No Load
Digital Code = +1LSB, No Load
Digital Code = 0, No Load
2
CV
V
C
input referred
THD+N ≤ 1%, R
f
P
f
R
BW = 20Hz to 20kHz, R
A-weighted, Input referred
200mV, 1kHz, V
IN
IN
Power Amplifier
Headphone Amplifier
Power Amplifier
Headphone Amplifier
Power Amplifier
Headphone Amplifier
RIPPLE
O
BYPASS1
IN
f = 50Hz
f = 60Hz
f = 100Hz
f = 120Hz
f = 1kHz
DD
= 1kHz
= 1kHz
= 20mW, R
= 50Ω, C
= 5V, R
= 200mV
= 10µF,
5
Conditions
Conditions
IN
L
A
L
= 8Ω, LC filter values as shown in Figure 1, unless other-
= 1µF,
IN
L
= 25˚C.
= 32Ω,
P-P
= 32Ω,
= 0, R
,
(Notes 1, 2)
L
L
= 32Ω
= 32Ω
Typical
0.02
(Note 8)
Typical
82
84
92
95
95
94
22
77
–48
–65
–76
30
13
LM4681
LM4681
Limit
(Note 7)
70
Limit
–46
–63
–74
–74
29
12
www.national.com
dB (max)
dB (max)
(Limits )
dB (min)
dB (min)
dB (min)
dB (min)
Units
(min)
mW
Units
dB
µV
dB
%