am79c30a Advanced Micro Devices, am79c30a Datasheet - Page 28

• Manufacturer Part Number: am79c30a
• Description: Digital Subscriber Controller ?dsc ?circuit
• Manufacturer: Advanced Micro Devices

Programmable Gain Coefficients
The GER, GR, GX, and Sidetone gain coefficients are each 16 bits in length. Two consecutive register locations
correspond to one gain coefficient. The LSB is transferred first to (or from) the microprocessor. Sample coefficients
for the GER filter are listed in Table 24. The gain values are rounded off to the nearest 0.1 dB.
Note:
The coefficient 0008 provides an attenuation of infinity when GER gain is enabled.
28
Gain (dB)
–9.5
–9.0
–8.5
–8.0
–7.5
–7.0
–6.5
–6.0
–5.5
–5.0
–4.5
–4.0
–3.5
–3.0
–2.5
–2.0
–1.5
–1.0
–0.5
–10
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
MSB
AA
9B
9C
9D
6A
AB
AB
6A
2A
BE
5C
79
09
41
31
74
54
74
64
75
00
55
43
52
77
55
41
33
Hex Code
Table 24. GER Gain Coefficients
Am79C30A/32A Data Sheet
LSB
CD
CD
DD
DD
DD
AA
BB
AC
DE
EF
9C
9D
AE
DF
AB
BD
EF
CE
4C
EF
9A
FF
1B
99
99
29
99
42
Gain (dB)
10.0
10.5
11.0
11.5
12.0
12.5
13.0
13.4
14.0
14.5
15.0
15.5
15.9
16.6
16.9
17.5
18.0
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
MSB
31
44
43
33
40
11
44
41
31
55
10
42
41
11
60
00
42
40
11
22
72
42
21
10
22
11
00
21
00
Hex Code
LSB
DD
DD
DD
DD
DD
0B
1F
1F
1F
0F
1F
1F
20
11
0F
1F
0B
10
0F
0F
10
00
00
10
0F
00
10
00
0F