CS44600-DQZ CIRRUS [Cirrus Logic], CS44600-DQZ Datasheet - Page 56

• Manufacturer Part Number: CS44600-DQZ
• Description: 6-Channel Digital Amplifier Controller
• Manufacturer: CIRRUS [Cirrus Logic]

56
1. Convert the decimal integer to binary. This is MSTR_IVOL[7:0].
2. Select the bit representation of the desired 0.25 fractional increment. This is MSTR_FVOL[1:0].
3. Concatenate MSTR_IVOL[7:0]: MSTR_FVOL[1:0] to form a 10-bit binary value.
4. Perform a 2’s complement conversion on all 10 bits.
To convert from a 2’s complement integer:fraction value to a negative decimal, do the following:
1. Concatenate MSTR_IVOL[7:0]: MSTR_FVOL[1:0] to form a 10-bit binary value.
2. Perform a 2’s complement conversion on all 10 bits.
3. Convert the 10-bit binary number to a decimal value.
4. Divide the decimal value by 4.
The upper 8 bits are now the new MSTR_FVOL[7:0] and the two lower bits are MSTR_FVOL[1:0].
MSTR_IVOL[7:0]
0001 1000
0000 0001
0000 0001
0000 0000
0000 0000
1000 0010
1000 0001
1000 0001
0001 0111
1111 1101
1111 1110
1111 1111
1111 1111
Table 7. Master Fractional Volume Settings
MSTR_FVOL(1:0)
00
10
00
01
00
10
00
10
00
00
11
11
11
Volume Setting
-126.00 dB
-126.25 dB
-127.00 dB
+24.00 dB
+23.50 dB
+1.75 dB
+1.00 dB
+0.25 dB
-0.50 dB
-1.00 dB
-1.25 dB
-2.50 dB
0 dB
CS44600
DS633PP1