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PRODUCT SPECIFICATION
RC5512
7
Portable PC Application
Figure 2 shows an application of the RC5512 for portable
PCs when a high current, regulated 12 volts is not available.
Because the portable PC’s battery voltage can exceed the
VCC maximum specification of the RC5512, a low drop out
linear regulator with power down has been included. The lin-
ear regualtor provides 12 volts of regulation even if the bat-
tery voltage exceeds 20 volts. In addition, the low drop out
regulator allows good sound quality even when the battery
voltage drops to 9 volts. The low power down current bias of
the regulator minimizes the battery current drain when the
RC5512 is in a sleep mode.
Alternatively, if a regulated 12 volt supply is available with a
minimum current output of 300mA and sufficient by-pass
capacitance, no additional regulation is required.
Figure 2. RC5512 Portable PC Application.
REGPD
C11
16V 22
μ
F
C9
0.1
μ
F
R2
2
/0.5W
1
Right Speaker Output Ground
Right Speaker
Output
Left Speaker Output Ground
Left Speaker
Output
TTL Input
Speaker Power-Down
Right Line Output
Microphone Output
GNDREG
SPKPD
GNDMIC
RC5512
MICPD
MICSEL
AGCTC
5
2
6
7
8
9
12 13 14 15 16 17 18
10
11
25
24
23
22
21
20
19
VCCDROPL
SPKLOUTL
GNDSPKL
GNDSPKR
SPKOUTR
SFTSTSRT
VCCDROPR
M
M
R
G
M
V
1
E
2
I
3
G
4
O
5
S
R
V
R
R
L
V
L
S
+
C4
100
μ
F
16V
+
Left Line Output
TTL Input/Shutdown
+5V Regulated Output
C3
100
μ
F
16V
C5
1000
μ
F
16V
Left Line Driver
Input
C6
1
F
16V
Q1
2N2222
Star
Ground
+
C8
16V 470
μ
F
+
C7
470
μ
F 16V
+
C1
16V 10
μ
F
VBAT
C14
16V 10
μ
F
+
+
+
C2
16V 10
μ
F
+
C15
16V 10
μ
F
+
+
R3
1K
2
1
R2
2
/0.5W
1
U2
MIC29201
2
C13
0.1
μ
F
C12
0.1
μ
F
16V
C10
0.1
μ
F
65-5512-04
TTL Input Regulator
Power-Down
TTL Input Line Out
Power-Down
TTL Input Microphone
Power-Down
TTL Input Mic In Select
Microphone
Ground
Microphone Input 1
Microphone Input 2
Right Line Driver Input