lm49200tlx National Semiconductor Corporation, lm49200tlx Datasheet - Page 16

• Manufacturer Part Number: lm49200tlx
• Description: Stereo Class Ab Audio Subsystem With A True Ground Headphone Amplifier
• Manufacturer: National Semiconductor Corporation

www.national.com
M : MIN, Mono differential input
Bits
3:0
4
Bit
0
1
2
4
Mode_Control These bits determine how the input signals are mixed and routed to the outputs.
EP Mode
Field
Turn_On_Time
I
Power_On
2
HPR_SD
Value
This bit sets the loudspeaker amplifiers for earpiece mode.
CV
Name
Value
0000
0001
0010
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
011
DD
0
1
TABLE 4. Output Mode Control Register (see key below table)
_SD
Mode
Normal loudspeaker operation, control determined by bits 3:0.
Bit overrides bits 3:0. Right loudspeaker amplifier bias current reduced for low power
operation. Left loudspeaker amplifier shutdown. Mono input path active and signal routed to
right loudspeaker output. Left & right input gain amplifiers shutdown for reduced power
consumption.
10
11
12
13
14
15
0
1
2
3
4
5
6
7
8
9
This bit is a master shutdown control bit and sets the device to be on or off.
This bit sets the turn on time of the device.
This bit allows the I
This bit is used when only one channel of the headphone amplifier is needed.
TABLE 3. Shutdown Control Register
G
G
G
G
Loudspeaker
L
L
L
L
x L + G
x L + G
x L + G
x L + G
G
G
G
G
Value
Value
Value
Value
G
G
G
G
Left
M
M
M
M
SD
SD
SD
SD
L
L
L
L
0
1
0
1
0
1
0
1
x M
x M
x M
x M
x L
x L
x L
x L
M
M
M
M
x M G
x M G
x M G
x M G
2
Master power off, device disable.
Master power on, device enable.
Normal Turn-on time
Fast Turn-on time
I
1.1V, the device resets and the I
default state.
Normal Operation. I
Normal headphone operation.
Mono headphone output at left channel, right headphone in
shutdown.
C supply voltage to be used as a reset signal.
2
16
Loudspeaker
R
R
R
L
CV
x R + G
x L + G
x R + G
x R + G
G
G
G
G
G
G
G
DD
G
Right
M
M
M
M
R
R
R
SD
SD
SD
SD
L
acts as an active low reset input. If I
Description
x M
x L
x M
x R
x M
x R
x M
x R
M
M
M
M
x M
x M
x M
x M
Status
2
G
G
G
G
CV
Left Headphone
L
L
L
L
x L + G
x L + G
x L + G
x L + G
DD
G
G
G
G
G
G
G
G
M
M
M
M
Description
Mute
Mute
Mute
voltage does not reset the device.
SD
L
L
L
L
x M/2
x M/2
x M/2
x M/2
x L
x L
x L
x L
Status
Status
Status
M
M
M
M
2
x M/2
x M/2
x M/2
x M/2
C registers are restored to their
2
G
G
G
G
CV
Right Headphone
R
R
R
R
DD
x R + G
x R + G
x R + G
x R + G
G
G
G
G
G
G
G
G
drops below
M
M
M
M
Mute
Mute
Mute
R
R
R
R
SD
x M/2
x M/2
x M/2
x M/2
x R
x R
x R
x R
M
M
M
M
x M/2
x M/2
x M/2
x M/2