CMX649 CML Microcircuits, CMX649 Datasheet - Page 18

• Manufacturer Part Number: CMX649
• Description: ADM Codec
• Manufacturer: CML Microcircuits

ADM Codec
Sidetone Level
(Bits 2 – 1)
Sidetone Enable
(Bit 0)
AUDIO INPUT LEVEL CONTROL Register ($63)
Audio Input
Level Control
(Bits 7 – 3)
Reserved
(Bits 2– 0)
2003 CML Microsystems Plc
Bit 7
These bits control the gain of the sidetone signal coming from the AAF output to be
summed in with the decode signal at the input to the AIF.
When this bit is a logic 1 the sidetone path is enabled with the gain setting controlled
as shown above. When this bit is logic 0 the sidetone path is disabled.
These bits are used to set the gain of the Digitally Controlled Amplifier (DCA) at the
output of the microphone amplifier.
These bits are reserved and should be set to a logic 0.
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
Bit 6
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
Bit 5
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
Bit 2
0
0
1
1
Bit 4
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
Bit 1
0
1
0
1
Bit 3
18
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
Gain Setting
-15dB
-21dB
-9dB
0dB
Audio Input Gain
-7.5dB
-7.0dB
-6.5dB
-6.0dB
-5.5dB
-5.0dB
-4.5dB
-4.0dB
-3.5dB
-3.0dB
-2.5dB
-2.0dB
-1.5dB
-1.0dB
-0.5dB
0.0dB
0.5dB
1.0dB
1.5dB
2.0dB
2.5dB
3.0dB
3.5dB
4.0dB
4.5dB
5.0dB
5.5dB
6.0dB
6.5dB
7.0dB
7.5dB
Off
CMX649
D/649/2