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LM4869 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM4869
Description  1.9W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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 4 page
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Electrical Characteristics for LM4869 (Notes 2, 9) (Continued)
The following specifications applies to the LM4869 when used in the circuit shown in Figure 1 and operating with V
DD =5Vand
A
V = 6dB, unless otherwise specified. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
LM4869
Units
(Limits)
Typical
(Note 9)
Limit
(Note 10)
(Note 11)
∆A
V CH-CH
Channel-to-Channel Gain Mismatch
R
L =8
Logic Low Applied to Pin 2
Logic Low Applied to Pin 3
0.12
0.3
dB (max)
Logic Low Applied to Pin 2
Logic High Applied to Pin 3
0.12
0.3
dB (max)
Logic High Applied to Pin 2
Logic Low Applied to Pin 3
0.12
0.3
dB (max)
Logic High Applied to Pin 2
Logic High Applied to Pin 3
0.12
0.3
dB (max)
Note 1: An LM4869MH that has been properly mounted to a circuit board with a copper heatsink area of at least 2in2 will deliver 1.9W into 4
Ω.
Note 2: All voltages are measured with respect to the GND pin unless other wise specified.
Note 3: 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 4: 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 -TAJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4869, see power derating
currents for more information.
Note 5: Human body model, 100 pF discharged through a 1.5 k
Ω resistor.
Note 6: Machine Model, 220pF-240pF discharged through all pins.
Note 7: The given
θJA is for an LM4869 packaged in an MXA20A with the exposed-DAP soldered to an exposed 4in2 area of 1oz printed circuit board copper. When
driving 4
Ω loads from a 5V supply, the LM4869MH must be mounted to the circuit board and its exposed-DAP soldered to an exposed 2in2 area of 1oz PCB copper.
Note 8: The given
θJAis for an LM4869 packaged in an MXA20A with the exposed DAP soldered to an exposed 8in2 area of 1oz printed circuit board (PCB) copper
and two 8in2 inner layer ground planes in a four-layer PCB.
Note 9: Typicals are measured at 25˚C and represent the parametric norm.
Note 10: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 11: Datasheet minimum and maximum specification limits are guaranteed by design, test, or statistical analysis.
Note 12: Output power is measured at the amplifier’s package pins.
Note 13: When driving 4
Ω loads and operating on a 5V supply, the LM4869MH must be mounted to a circuit board that has a minimum of 2.5in2 of exposed,
uninterrupted copper area connected to the LLP package’s exposed DAP.
External Components Description
( Refer to Figure 1.)
Components
Functional Description
1.
C
i
The input coupling capacitor blocks DC voltage at the amplifier’s inverting input terminals. C
i, along with the
LM4869’s fixed input resistance R
i (25k
Ω, typ), creates a highpass filter with f
C = 1/(2
πR
iCi). Both inverting
and noninverting inputs require a C
i. Refer to the Application Information section, SELECTING EXTERNAL
COMPONENTS, for an explanation of determining the value of C
i.
2.
C
S
The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about
properly placing, and selecting the value of, this capacitor.
3.
C
B
The capacitor, C
B, filters the half-supply voltage present on the BYPASS pin. Refer to the Application
Information section, SELECTING EXTERNAL COMPONENTS, for information concerning proper placement
and selecting C
B’s value.
www.national.com
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