AK2308LV_05 Datasheet, PDF (14/31 Pages) Asahi Kasei Microsystems – SPEECH CODEC for Digital Key telephone

ASAHI KASEI
[AK2308LV]
3-2 Voice path gain Controls
AK2308LV provides the RX and TX voice gain control functions both in analog domain and in digital domain. These gain
can be controlled from following five registers.
3-2-1. RX voice path gain controls
RX side voice path has three gain control blocks. These gain stages are controlled through following three
registers, “RX Digital Volume Control”, “RX Handset Volume Control” and “RX Speaker Control”.
RX Digital Volume Control
Register Type : Read Write[Address:0100
D4-D0(VRX4-VRX0)]
ADD
D7
D6
D5
D4
D3
D2
D1
4
-
-
-
VRX4 VRX3 VRX2 VRX1
Default 0
0
0
0
0
0
0
D0
VRX0
0
VRX[4-0]; RX side digital volume from +15dB to –16dB by 1dB step.
VRX4
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
VRX3
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
VRX2
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
VRX1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
VRX0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
RX digital Attenuator
-16dB
-15dB
-14dB
-13dB
-12dB
-11dB
-10dB
-9dB
-8dB
-7dB
-6dB
-5dB
-4dB
-3dB
-2dB
-1dB
0dB
+1dB
+2dB
+3dB
+4dB
+5dB
+6dB
+7dB
+8dB
+9dB
+10dB
+11dB
+12dB
+13dB
+14dB
+15dB
Comment
default
MS0227-E-01
14
2005/12