Datasheet

-
+
-
+
+
-
+
-
-
-
+
Internal gain select
V
DD
V
DD
Mode
Control
3 7 19 18
100 k:
To Control Pin on
Headphone Jack
Beep
In
Left Dock
Mute
Mode
21
5
4
HP Sense
0.1 PF
12
13
11
10
9
6,16,27
1,8,14,20,23
22
20 k:
Rbeep
Rbeep
20 k:
V
DD
GND
Bypass
Beep
Detect
Power
Management
Click and Pop
Suppression
Circuitry
Volume
Control
32 steps
Bias
20 k:
200 k:
20 k:
20 k: 20 k:
10 k: 10 k:
Right Gain 1 Right Gain 2
10 k:
10 k:
20 k:
20 k:
20 k:
20 k:
RL
2 24 25
+
Bias
17
15
28
26
+LOut
-LOut
-ROut
CONTROL PIN
RING
220 PF
TIP
HEADPHONE JACK
SLEEVE
220 PF
+ROut
To HP sense
Circuit
+
+
200 k:
0.33 PF
0.33 PF
1 PF
0.1 PF10 PF
Audio
In Left
Audio
In Right
+
+
100 k:
Shutdown
RL
R
FR
R
IR
R
FL
R
IL
20 k:
0.068 PF
20 k:
0.068 PF
C
IL
C
IR
DC Volume
Control
RPU
RS
1.5 k:
1.5 k:
CO
+
1 PF
Right Dock
CO
+
1 PF
C
IB
+
0.33 PF
CB
CSCSCS1
RI RF
CBS
CV
RBS
COUT
COUT
RBS
CBS
RI RF
Left Gain 1 Left Gain 2
20 k: 20 k:
0.1 PF
V
DD
LM4938
SNAS245B –FEBRUARY 2005–REVISED MAY 2013 www.ti.com
Typical Application
Figure 3. Typical Application Circuit
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Product Folder Links: LM4938