AM79C32AVC datasheet(28/101 Pages) AMD

28 / 101 page

Am79C30A/32A Data Sheet

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.

Table 24.

GER Gain Coefficients

Gain (dB)

Hex Code

Gain (dB)

Hex Code

MSB

LSB

MSB

LSB

–10

4.0

–9.5

4.5

–9.0

5.0

–8.5

5.5

–8.0

6.0

–7.5

6.5

–7.0

7.0

–6.5

7.5

–6.0

8.0

–5.5

8.5

–5.0

9.0

–4.5

9.5

–4.0

10.0

–3.5

10.5

–3.0

11.0

–2.5

11.5

–2.0

12.0

–1.5

12.5

–1.0

13.0

–0.5

13.4

0.0

14.0

0.5

14.5

1.0

15.0

1.5

15.5

2.0

15.9

2.5

16.6

3.0

16.9

3.5

17.5

18.0

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