LM4906LD National Semiconductor, LM4906LD Datasheet - Page 4

• Manufacturer Part Number: LM4906LD
• Description: 1W/ Bypass-Capacitor-less Audio Amplifier with Internal Selectable Gain
• Manufacturer: National Semiconductor

www.national.com
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.
External Components Description
Components
1.
2.
OUT
C
C
is measured from the output pin to ground. This value represents the parallel combination of the 10kΩ output resistors and the two 20kΩ resistors.
2
1
Input coupling capacitor which blocks the DC voltage at the amplifiers input terminals. Also creates a
highpass filter with R
for an explanation of how to determine the value of C
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.
DMAX
= (T
JMAX
–T
A
i
)/θ
DD
at f
JA
exceeds 6V (to a max of 8V V
DMAX
c
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4906, see power derating
= 1 / (2πR
) occurs at an output power level significantly below full output power. P
i
C
i
). Refer to the section, Proper Selection of External Components,
Functional Description
4
DD
), then most of the excess current will flow through the ESD protection circuits.
i
.
JMAX
, θ
JA
, and the ambient temperature T
DD
is greater than 5.5V and less than
DMAX
can be calculated using
A
. The maximum