Datasheet

LM4938
www.ti.com SNAS245B –FEBRUARY 2005–REVISED MAY 2013
Truth Table for Logic Inputs
(5)
Gain Sel Mode Headphone Mute Shutdown Output Stage Set To DC Volume Output Stage
Sense 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
(5) 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.
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