AK4545 Datasheet, PDF (21/33 Pages) Asahi Kasei Microsystems – AC97 AUDIO CODEC WITH SRC AND DIT

[ASAHI KASEI]
[AK4545]
n Play Master Volume Registers (Index 02h ,06h) and LINVL(True Line Level Out) Volume Register(Index 04h)
The following table shows the relationship between bits and the attenuation value with step size of 1.5dB. The
AK4545 has a range of 0dB to –46.5dB. The AK4545 does not support the optional MX5 bit.
The AK4545 detects when MX5 is set and set all 5 LSBs to 1s. Example: When the driver writes a “01xxxxx” the AK4545
interpret that as “0011111”. When this register is read, the return value is “0011111”.
Mute _{MX5 MX4 MX3 MX2 MX1 MX0}
Att.
0
0
0
0
0
0
0
0dB
0
0
0
0
0
0
1
-1.5dB
0
0
0
0
0
1
0
-3.0dB
0
0
0
0
0
1
1
-4.5dB
-------------------------------------------------------------------------
0
0
1
1
1
1
0 -45.0dB
0
0
1
1
1
1
1 -46.5dB
-------------------------------------------------------------------------
0
1
X
X
X
X
X -46.5dB
-------------------------------------------------------------------------
1
X
X
X
X
X
X
Mute
n PC Beep Register (Index 0Ah)
The following table shows the relationship between bits and the attenuation value. The attenuation step is 3dB with
a range of 0 to –45dB. PC_BEEP of the AK4545 is 0dB at default state.
The PC Beep is routed to L & R Line outputs directly when AK4545 is in a RESET State(Reset# is “L”) or when the mixer is
powerdown with Vref on(PR2=”1” and PR3=”0”). The PC BEEP isn’t routed to True Line Level Out under these states. This is so
that Power on Self Test(POST) codes can be heard by the user in case of a hardware problem with the PC. After Reset# goes “H”,
direct PC beep pass through becomes OFF.
Mute _{PV3 PV2 PV1 PV0}
Att.
0
0
0
0
0
0dB
0
0
0
0
1
-3.0dB
0
0
0
1
0
-6.0dB
--------------------------------------------------------------
0
1
1
1
1 -45.0dB
1
X
X
X
X
Mute
n Analog Mixer Input Gain Registers (Index 0Ch-18h)
The following table shows the relationship between bits and the gain/attenuation value. Attenuation step is 1.5dB
with a range of +12dB to –34.5dB.
Mute _{Gx4 Gx3 Gx2 Gx1 Gx0}
Att.
0
0
0
0
0
0
+12dB
0
0
0
0
0
1 +10.5dB
-----------------------------------------------------------------------
0
0
1
0
0
0
0dB
0
0
1
0
0
1
-1.5dB
-----------------------------------------------------------------------
0
1
1
1
1
0 -33.0dB
0
1
1
1
1
1 -34.5dB
1
X
X
X
X
X
Mute
n Record Select Control Register (Index 1Ah)
SR2 SR1 SR0
0
0
0
0
0
1
0
1
0
0
1
1
1
0
0
1
0
1
1
1
0
1
1
1
Att.
Mic
CD In (R)
Video In (R)
Aux In (R)
Line In (R)
Stereo Mix (R)
Mono Mix
Phone
MS0058-E-00
- 21 -
2000/11