lm4928tlx National Semiconductor Corporation, lm4928tlx Datasheet - Page 5

• Manufacturer Part Number: lm4928tlx
• Description: 1.2 Watt Stereo Fully Differential Audio Amplifier With Rf Suppression And Shutdown Low
• Manufacturer: National Semiconductor Corporation

P
THD+N
PSRR
CMRR
V
V
V
SNR
T
Symbol
WU
o
OS
SDIH
SDIL
Electrical Characteristics V
The following specifications apply for V
25˚C. (Continued)
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: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
allowable power dissipation is P
derating curve for additional information.
Note 4: Human body model, 100pF discharged through a 1.5kΩ resistor.
Note 5: Machine Model, 220pF – 240pF discharged through all pins.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: Inputs are AC terminated to GND.
Note 9: When driving 4Ω loads from a 5V power supply, the LM4928SD must be mounted to a circuit board with the exposed-DAP area soldered down to at least
4in
Note 10: Data taken with BW = 80kHz and A
Note 11: Maximum Power Dissipation (P
Equation 4 shown in the Application section. It may also be obtained from the Power Dissipation graphs.
External Components Description
Components
(Figure 1)
1.
2.
3.
4.
2
plane of 1oz, copper.
Output Power
Total Harmonic Distortion + Noise
Power Supply Rejection Ratio
Common-Mode Rejection Ratio
Output Offset
Shutdown Voltage Input High
Shutdown Voltage Input Low
Signal-to-Noise Ratio
Wake-up time from Shutdown
C
C
R
R
S
B
i
f
Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing
section for information concerning proper placement and selection of the supply bypass capacitor.
Bypass pin capacitor which provides half-supply filtering. Refer to the Power Supply Bypassing section for
information concerning proper placement and selection of C
Inverting input resistance which sets the closed-loop gain in conjunction with R
External feedback resistance which sets the closed-loop gain in conjunction with R
Parameter
DMAX
= (T
DMAX
JMAX
V
) in the device occurs at an output power level significantly below full output power. P
= 1 except where specified.
– T
DD
A
) / θ
= 3V, A
JA
DD
THD = 1% (max); f = 1 kHz
THD = 10% (max); f = 1 kHz
P
V
f = 217Hz, V
V
P
Cbypass = 1µF
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4928, see power
o
ripple
IN
O
V
R
R
R
R
= 3V
= 0.25Wrms; f = 1kHz
= 0.4W, f = 1kHz
= 0V
f = 217Hz (Note 8)
f = 1kHz (Note 8)
L
L
L
L
= 1, and 8Ω load unless otherwise specified. Limits apply for T
= 4Ω
= 8Ω
= 4Ω
= 8Ω
= 200mV sine p-p
(Notes 1, 2)
Conditions
CM
Functional Description
= 200mV
5
pp
B
.
JMAX
, θ
JA
(Note 6)
Typical
, and the ambient temperature T
0.55
0.40
0.68
0.50
0.05
105
90
90
70
4
9
LM4928
f
.
i
.
(Note 7)
DMAX
Limit
1.4
0.4
50
18
can be calculated using
A
. The maximum
A
www.national.com
=
mV (max)
dB (min)
(Limits)
Units
ms
dB
dB
W
W
%
V
V