Texas Instruments AN-1622 LM49100, Руководство пользователя, Страница: 4 / 20

Mixer
&
Mode Select
Mono Input
-60 dB - +12 dB
Left Input
-54 dB - +18 dB
Right Input
-54 dB - +18 dB
I
2
C
Interface
Class AB
+6 dB
I2C
BUS
V
IH
V
IL
MINP
MINN
LIN
RIN
SDA
SCL
ADDR GND
HPR
HPL
GND
LS-
LS+
V
DD
LS
V
DD
Audio
Input
Audio
Input
Audio
Input
V
DD
CP
Charge Pump
V
SS
HP V
SS
CP
C1P C1N
GNDCP
Bias
Click/Pop
Suppresion
BYPASS
0 dB
-12 dB
-18 dB
-24 dB
0 dB
-12 dB
-18 dB
-24 dB
2.2
P
F 0.1
P
F
+
GNDS
V
DD
HP
V
DD
CP
4.7
P
F
1 P F
1 P F
0.22
P
F
0.22
P
F
2.2
P
F
0.1 P F
+
+
CAV
SS
2.2
P
F
V
DD
I
2
C
C
B
2.2
P
F
V
DD
C
1
V
DD
I
2
C
C
IN
C
IN
C
IN
C
IN
Connections
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Figure 3. LM49100 Demonstration Board Schematic
7 Connections
Connecting to the world is accomplished through the 0.100” headers on the LM49100 demonstration
board. The functions of the different headers are detailed in
Table 1 .
Table 1. LM49100 Demonstration Board Connections
Header or Jumper Designation Function or Use
V
DD
/GND Main power supply and ground for the demonstration board.
V
DDHP
/GND Headphone power supply for the headphone amplifier which creates split supplies: for the
positive voltage is converted by switch capacitor creating a negative voltage of equal
magnitude.
J1 A shorted J1 connects V
DD
directly to I
2
CV
DD
. An opened J1 disconnects V
DD
and I
2
CV
DD
. If
open, a separate power supply connected to I
2
CV
DD
/GND header must be applied.
I
2
CV
DD
Header to apply an independent I
2
C power supply when J1 is open.
Right Input This is the connection to the amplifier’s single-ended right channel input.
Left Input This is the connection to the amplifier’s single-ended left channel input.
Mono Input This is the connection to the amplifier’s differential or single-ended left/right mono input.
The center two pins are the differential inputs, or single-ended inputs, while the outside
pins are the grounds.
Address Setting Used to set the address of the device. Normally set at “Low” on the demonstration board.
4 AN-1622 LM49100 Evaluation Board» SNAA043A – October 2007 – Revised May 2013
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