PRELIMINARY DATA SHEET
MSP 44x8G
Table 3–11: Write Registers on I2C Subaddress 12hex, continued
Register
Address
Function
Name
MAIN AND AUX PROCESSING
00 00hex
00 06hex
Volume Main
Volume Aux
VOL_MAIN
VOL_AUX
bit[15:8] volume table with 1 dB step size
7Fhex
7Ehex
...
+12 dB (maximum volume)
+11 dB
74hex
73hex
72hex
...
+1 dB
0 dB
−1 dB
02hex
01hex
00hex
FFhex
−113 dB
−114 dB
Mute (reset condition)
Fast Mute (needs about 75 ms until the signal is com-
pletely ramped down)
bit[7:5]
bit[4:0]
higher resolution volume table
0
+0 dB
1
+0.125 dB increase in addition to the volume table
...
7
+0.875 dB increase in addition to the volume table
not used
must be set to 0
With large scale input signals, positive volume settings may lead to signal clipping.
The MSP 44x8G Main and Aux volume function is divided into a digital and an
analog section. With Fast Mute, volume is reduced to mute position by digital vol-
ume only. Analog volume is not changed. This reduces any audible DC plops. To
turn volume on again, the volume step that has been used before Fast Mute was
activated must be transmitted.
0029hex
Automatic Volume Correction (AVC)
AVC
bit[15]
0
1
AVC off, reset of internal variables
AVC on
bit[14]
0
1
AVC in Main path
AVC in Mixer path
bit[13:12]
bit[11:8]
0
must be set to zero
8
4
2
1
8 s decay time
4 s decay time (recommended)
2 s decay time
20 ms decay time (should be used for approx. 100 ms
after channel change)
AVC_DECAY
00 34hex
Preemphasis Aux Channel
PREEMP_AUX
bit[15:8] 00hex
7Fhex
Preemphasis OFF
Preemphasis 50 µs (−3 dB scaling)
Preemphasis 75 µs (−3 dB scaling)
FFhex
Micronas
29
MICRONAS [ MICRONAS ]
