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LM4926 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4926
Description  Ground-Referenced, Ultra Low Noise, Fixed Gain, 80mW Stereo Headphone Amplifier
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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LM4926 Datasheet(HTML) 5 Page - National Semiconductor (TI)

 
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Electrical Characteristics V
DD =3V (Note 1) (Continued)
The following specifications apply for V
DD = 3V and 16
Ω load unless otherwise specified. Limits apply to T
A = 25˚C.
Symbol
Parameter
Conditions
LM4926
Units
(Limits)
Typ
(Note 6)
Limit
(Notes 7, 8)
X
TALK
Crosstalk
R
L =16
Ω,P
O = 1.6mW,
f = 1kHz
60
dB
Z
OUT
Output Impedance
Input Terminated
Input not terminated
60
k
I
L
Input Leakage
±0.1
nA
V
IN THRESH
Input Voltage Threshold
2.8
mVp
Note 1: All voltages are measured with respect to the GND 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 that
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 TJMAX, θJA, and the ambient temperature, TA. The maximum
allowable power dissipation is PDMAX =(TJMAX -TA)/ θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4926, see power
de-rating currents for more information.
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: 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: If the product is in shutdown mode and VDD exceeds 4.2V (to a max of 4.5V VDD), then most of the excess current will flow through the ESD protection
circuits. If the source impedance limits the current to a max of 10mA, then the part will be protected. If the part is enabled when VDD is above 4.5V, circuit
performance will be curtailed or the part may be permanently damaged.
Note 10: Human body model, 100pF discharged through a 1.5k
Ω resistor.
Note 11:
θJA value is measured with the device mounted on a PCB with a 3” x 1.5”, 1oz copper heatsink.
External Components Description (Figure 1)
Components
Functional Description
1.
C
i
Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a
high-pass filter with R
i at fC = 1/(2
πR
iCi). Refer to the section Proper Selection of External Components, for
an explanation of how to determine the value of C
i.
2.
C
1
Flying capacitor. Low ESR ceramic capacitor (
≤100mΩ)
3.
C
2
Output capacitor. Low ESR ceramic capacitor (
≤100mΩ)
4.
C
3
Tantalum capacitor. 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.
5.
C
4
Ceramic capacitor. 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.
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