ADAV4601 System Design Document
Confidential Information
Rev.1 August 2009
Analog Devices
Page 74
Bit No.
Bit
Name
Description
Default
0x26 = −7 dB
…
0x2F = −11.5 dB
0x30 = −12 dB
Address 0x0108 Main Channel Loudness Register (Default: 0x0000)
Table 17.
Bit No.
Bit Name
Description
Default
Bits[15:7]
Reserved
Always write as 0 if writing to this register.
000000000
Bits[6:5]
Cutoff
frequency
These register bits are used to control the cutoff frequency of the
loudness.
00
00b – 10 Hz
01b – 30 Hz
10b – 50 Hz
11b – 70 Hz
Bits[4:0]
Loudness level
These register bits are used to control the required level of loudness.
00000
0x00 = 0 dB
0x01 = +1 dB
…
0x0E = +14 dB
0x0F = +15 dB
Address 0x0109 Crossover Register (Default: 0x0505)
Table 18.
Bit No.
Bit Name
Description
Default
Bits[15:14]
Reserved
Always write as 0 if writing to this register.
00
Bits[13:8]
Low crossover
frequency
The low crossover frequency is the cutoff frequency of the
crossover low-pass filter. This means that only the frequencies
under this frequency are sent to the woofer output. The frequency
changes in 10 Hz steps.
000101
0x00 = 50 Hz
0x01 = 60 Hz
0x02 = 70 Hz
0x03 = 80 Hz
0x04 = 90 Hz
0x05 = 100 Hz
0x06 = 110 Hz
…
0x2D = 500 Hz
0x2E = 510 Hz
Bits[7:6]
Reserved
Always write as 0 if writing to this register.
00
Bits[5:0]
High crossover
frequency
The high crossover frequency is the cutoff frequency of the
crossover high-pass filter. This means that only the frequencies
above this frequency are sent to the tweeter output.
000101
0x00 = 50 Hz
0x01 = 60 Hz
0x02 = 70 Hz
