Product Info

VTech proprietary and confidential
VTech Communications LTD.
R&D Department
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Ref. No.: 20191009 Version: 01 Date: 09 Oct, 2019 Page 16 of 33
• 32 kHz
• 40 kHz
• 44.1 kHz
• 48 kHz
7.2.3.2 DAC gain
The DAC outputs have two gain stages, a digital stage followed by an analog stage. The digital gain varies
between -24 dB and 21.5 dB and the analog gain between -21 dB and 0 dB, giving a total range of -45 dB to
21.5 dB.
Calls connected by the VM stream automatically select the distribution of gain within the DAC for best
performance. Alternatively, the individual gain stages can be set.
Table 7-2 DAC digital gain selection
Digital gain selection value
ADC digital gain
setting (dB)
Digital gain selection value
ADC digital gain
setting (dB)
0
0
8
-24
1
3.5
9
-20.5
2
6
10
-18
3
9.5
11
-14.5
4
12
12
-12
5
15.5
13
-8.5
6
18
14
-6
7
21.5
15
-2.5
Table 7-3 DAC analog gain selection
Analog gain
selection value
DAC analog gain
setting (dB)
Analog gain
selection value
DAC analog gain
setting (dB)
7
0
3
-12
6
-3
2
-15
5
-6
1
-18
4
-9
0
-21