lm4905 National Semiconductor Corporation, lm4905 Datasheet - Page 4

• Manufacturer Part Number: lm4905
• Description: 1 Watt Audio Power Amplifier
• Manufacturer: National Semiconductor Corporation

www.national.com
I
I
V
V
V
P
T
THD+N
PSRR
DD
SD
Symbol
WU
SDIH
SDIL
OS
o
Electrical Characteristics V
The following specifications apply for the circuit shown in Figure 1, unless otherwise specified. Limits apply for T
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
curves 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: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 9: R
Note 10: If the product is in Shutdown mode and V
If the source impedance limits the current to a max of 10mA, then the device will be protected. If the device is enabled when V
6.5V, no damage will occur, although operation life will be reduced. Operation above 6.5V with no current limit will result in permanent damage.
Note 11: Maximum power dissipation in the device (P
Equation 1 shown in the Application Information section. It may also be obtained from the power dissipation graphs.
OUT
Quiescent Power Supply Current
Shutdown Current
Shutdown Voltage Input High
Shutdown Voltage Input Low
Output Offset Voltage
Output Power
Wake-up time
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
is measured from the output pin to ground. This value represents the parallel combination of the 10kΩ output resistors and the two 20kΩ resistors.
Parameter
DMAX
= (T
JMAX
–T
A
)/θ
DD
JA
exceeds 6V (to a max of 8V V
DMAX
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4905, see power derating
DD
V
V
V
THD = 1% (max); f = 1 kHz
P
V
Input terminated with 10Ω
) occurs at an output power level significantly below full output power. P
IN
IN
SD
o
ripple
= 0.15 Wrms; f = 1kHz
= 2.6V
= 0V, I
= 0V, I
= V
= 200mV sine p-p
GND
o
o
Conditions
= 0A, No Load
= 0A, 8Ω Load
4
(Notes 1, 2)
DD
), then most of the excess current will flow through the ESD protection circuits.
JMAX
51 (f =
217Hz)
51 (f = 1kHz)
, θ
JA
(Note 6)
Typical
, and the ambient temperature T
0.01
270
2.0
3.0
1.2
1.0
0.1
70
5
LM4905
DD
is greater than 5.5V and less than
(Notes 7, 8)
DMAX
Limit
1.0
50
can be calculated using
A
A
= 25˚C.
. The maximum
mA (max)
mA (max)
mV (max)
mS (max)
µA (max)
dB (min)
(Limits)
V (max)
V (min)
Units
mW
%