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LM4838 Datasheet(PDF) 6 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM4838
Description  Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain
PDF  36 Pages
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM4838 Datasheet(HTML) 6 Page - National Semiconductor (TI)

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Electrical Characteristics for Bridged Mode Operation (Notes 7, 10) (Continued)
Note 16: All bumps have the same thermal resistance and contribute equally when used to lower thermal resistance. The LM4838ITL demo board (views featured
in the Application Information section) is a four layer board with two inner layers. The second inner layer is a VDD plane with the bottom outside layer a GND plane.
The planes measure 1,900mils x 1,750mils (48.26mm x 44.45mm) and aid in spreading heat due to power dissipation within the IC.
Typical Application
Truth Table for Logic Inputs (Note 17)
Gain
Sel
Mode
Headphone
Sense
Mute
Shutdown Output Stage Set To
DC Volume
Output Stage
Configuration
0
0
0
0
0
Internal Gain
Fixed
BTL
0
0
1
0
0
Internal Gain
Fixed
SE
0
1
0
0
0
Internal Gain
Adjustable
BTL
0
1
1
0
0
Internal Gain
Adjustable
SE
1
0
0
0
0
External Gain
Fixed
BTL
1
0
1
0
0
External Gain
Fixed
SE
1
1
0
0
0
External Gain
Adjustable
BTL
1
1
1
0
0
External Gain
Adjustable
SE
X
X
X
1
0
Muted
X
Muted
X
X
X
X
1
Shutdown
X
X
Note 17: If system beep is detected on the Beep In pin, the system beep will be passed through the bridged amplifier regardless of the logic of the Mute and HP
sense pins.
20013303
FIGURE 2. Typical Application Circuit ( LQ Package Pinout )
www.national.com
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