LM4546AVHX/NOPB National Semiconductor, LM4546AVHX/NOPB Datasheet - Page 15

• Manufacturer Part Number: LM4546AVHX/NOPB
• Manufacturer: National Semiconductor

Specifications of LM4546AVHX/NOPB

• Single Supply Voltage (typ): 3.3/5V
• Single Supply Voltage (min): 3/4.2V
• Single Supply Voltage (max): 5.5V
• Package Type: LQFP
• Lead Free Status / RoHS Status: Compliant

individually muted by either setting the most significant bit
(Mx5), and/or the mute bit (D15) to "1."
PC Beep Register (0Ah)
This register controls the level of the PC_BEEP input. The
PC_BEEP can be both attenuated and muted via register
0Ah. Step size is nominally 3dB. The signal present after the
attenuation and mute block is summed into both the left and
right channels.
Mixer Input Volume Registers (Index 0Ch - 12h, 18h)
These registers set the input volume levels including mute.
Each volume control is 5 bit which provides from a range of
+12dB gain to 34.5dB attenuation in 1.5dB steps. For stereo
ports, the left and right levels can be independently set. Mut-
ing a given port is accomplished by setting the MSB to 1.
Setting the MSB to 1 for stereo ports mutes both the left and
right channel. Register 0Eh has an additional 20dB boost for
a microphone level input. This is enabled by setting bit 6 of
register 0Eh to 1.
Record Select Register (1Ah)
This register independently controls the source for the right
and left channel which will be recorded by the stereo ADC.
The default value is 0000h which corresponds to Mic in.
Default: 8000h
Default: 0000h
Default: 8008h (mono regs.), 8808h (stereo regs.)
SR2:SR0
SL2:SL0
Mute
Mute
Mute
0
0
0
1
0
0
1
0
0
0
1
0
1
2
3
4
5
6
7
0
1
2
Mx5:Mx0
XX XXXX
1X XXXX
Gx4:Gx0
00 0000
01 1111
XXXXX
PV3:0
XXXX
00000
01000
11111
0000
1111
Right Record Source
Left Record Source
Stereo Mix (L)
Mono Mix (L)
Line In (L)
CD In (R)
CD In (L)
not used
not used
not used
Phone
Mic
Mic
46.5dB attenuation
46.5dB attenuation
34.5dB attenuation
100985 Version 4 Revision 1
45dB attenuation
0dB attenuation
0dB attenuation
+12dB gain
Function
Function
Function
0dB gain
mute
mute
mute
Print Date/Time: 2009/04/29 09:52:43
15
Record (Input) Gain Register (1Ch)
This registers controls the Record (Input) Gain level for the
stereo input selected via the Record Select Control Register
(1Ah). The gain can be programmed from 0dB to +22.5dB in
1.5dB steps. The level for the left and right channel can be
individually controlled. The input can also be muted by setting
the MSB to 1.
General Purpose Register (20h)
This register controls many miscellaneous functions imple-
mented on the LM4546. The miscellaneous functions include
POP which allows the PCM to bypass the National 3D Sound
circuitry, 3D which enables or disables the National 3D Sound
circuitry, MIX which selects the MONO_OUT source, MS
which selects the microphone mux source, and LPBK which
connects the output of the stereo ADC to the input of the
stereo DAC. LPBK provides a digital loopthru path when en-
abled.
Powerdown Control / Status Register (26h)
This read/write register is used to monitor subsystem readi-
ness and also to program the LM4546 powerdown states. The
lower half of this register is read only with a "1", indicating the
subsection is ready. Writing to the lower 8 bits will have no
effect.
When the AC Link "Codec Ready" indicator bit (SDATA_IN
slot 0, bit 15) is a "1", it indicates that the AC Link and AC '97
registers are in a fully operational state. The AC '97 Controller
must further probe the Powerdown Control / Status Register
to determine exactly which subsections are ready.
Supported powerdown modes.
Default: 8000h
SR2:SR0
LPBK
Mute
POP
DAC
ADC
REF
ANL
MIX
BIT
BIT
MS
3D
3
4
5
6
7
0
0
1
PCM out path and mute, 0 = pre 3D, 1 = post
Gx3:Gx0
Mono output select 0 = Mix, 1 = Mic
XXXX
ADC section ready to transmit data
1111
0000
DAC section ready to accept data
National 3D Sound on / off 1 = on
Mic select 0 = Mic1 1 = Mic2
Vref's up to nominal level
Right Record Source
Analog mixers ready
ADC/DAC loopback
Stereo Mix (R)
Mono Mix (R)
Line In (R)
Function
Function
not used
Phone
3D
22.5dB gain
Function
0dB gain
mute
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