lm4869mh National Semiconductor Corporation, lm4869mh Datasheet - Page 4

• Manufacturer Part Number: lm4869mh
• Description: 1.9w Differential Input, Btl Output Stereo Audio Amplifier With Selectable Gain And Shutdown
• Manufacturer: National Semiconductor Corporation

www.national.com
∆A
Symbol
Electrical Characteristics for LM4869
The following specifications applies to the LM4869 when used in the circuit shown in Figure 1 and operating with V
A
Note 1: An LM4869MH that has been properly mounted to a circuit board with a copper heatsink area of at least 2in
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, θ
allowable power dissipation is P
currents for more information.
Note 5: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 6: Machine Model, 220pF-240pF discharged through all pins.
Note 7: The given θ
driving 4Ω loads from a 5V supply, the LM4869MH must be mounted to the circuit board and its exposed-DAP soldered to an exposed 2in
Note 8: The given θ
and two 8in
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 4Ω loads and operating on a 5V supply, the LM4869MH must be mounted to a circuit board that has a minimum of 2.5in
uninterrupted copper area connected to the LLP package’s exposed DAP.
External Components Description
( Refer to Figure 1.)
Components
V CH-CH
1.
2.
3.
V
= 6dB, unless otherwise specified. Limits apply for T
2
Channel-to-Channel Gain Mismatch
inner layer ground planes in a four-layer PCB.
C
C
C
S
B
i
JA
JA
is for an LM4869 packaged in an MXA20A with the exposed DAP soldered to an exposed 8in
The input coupling capacitor blocks DC voltage at the amplifier’s inverting input terminals. C
LM4869’s fixed input resistance R
and noninverting inputs require a C
COMPONENTS, for an explanation of determining the value of C
The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about
properly placing, and selecting the value of, this capacitor.
The capacitor, C
Information section, SELECTING EXTERNAL COMPONENTS, for information concerning proper placement
and selecting C
is for an LM4869 packaged in an MXA20A with the exposed-DAP soldered to an exposed 4in
Parameter
DMAX
= (T
JMAX
B
B
’s value.
, filters the half-supply voltage present on the BYPASS pin. Refer to the Application
- T
A
/θ
JA
or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4869, see power derating
R
i
L
(25kΩ, typ), creates a highpass filter with f
Logic Low Applied to Pin 2
Logic Low Applied to Pin 3
Logic Low Applied to Pin 2
Logic High Applied to Pin 3
Logic High Applied to Pin 2
Logic Low Applied to Pin 3
Logic High Applied to Pin 2
Logic High Applied to Pin 3
i
. Refer to the Application Information section, SELECTING EXTERNAL
= 8Ω
A
= 25˚C.
Functional Description
(Notes 2, 9) (Continued)
4
Conditions
i
.
JA
, and the ambient temperature, T
2
2
area of 1oz printed circuit board copper. When
area of 1oz printed circuit board (PCB) copper
0.12
0.12
0.12
0.12
2
(Note 9)
will deliver 1.9W into 4Ω.
Typical
C
= 1/(2πR
LM4869
0.3
0.3
0.3
0.3
(Note 10)
(Note 11)
2
i
C
area of 1oz PCB copper.
Limit
i
). Both inverting
i
, along with the
A
. The maximum
DD
2
of exposed,
dB (max)
dB (max)
dB (max)
dB (max)
= 5V and
(Limits)
Units