ADAV4601 System Design Document
Confidential Information
Rev.1 August 2009
Analog Devices
Page 78
Address 0x0114 and Address 0x0115 Main Volume Control Registers (Default: 0x0080,
0x0000)
These two registers control the volume for the main channel output.
The volume control words are 28-bit words in twos complement and a 5.23 format. This means there are five bits to
the left of the decimal point of which the most significant bit is the sign bit.
Table 25.
Bit No.
Bit Name
Description
Default
Bits[15:12]
Reserved
Always write as 0 if writing to this
register.
0000
Bits[11:0]
Woofer right balance control
register[27:0]
0x0114 Bits[11:0] = main volume
Bits[27:16]
000010000000
Bits [15:0]
Woofer right balance control
register[27:0]
0x0115 Bits[15:0] = main volume
Bits[15:0]
0000000000000000
Address 0x0116 Tweeter Peak Limiter Control Register (Default: 0x0F00)
This register controls the peak limiter for the main output tweeter.
Table 26.
Bit No.
Bit
Name
Description
Default
Bits[15:13]
Reserved
Always write as 0 if writing to this register.
000
Bits[12:8]
Post gain
These register bits control the post gain in the range of +15 dB to −15 dB in +1
dB steps.
01111
0x00 = +15 dB
0x01 = +14 dB
…
0x08 = +7 dB
…
0x0F = +0 dB
…
0x16 = −7 dB
…
0x1D = −14 dB
0x1E = −15 dB
Bits[7:5]
Hold
time
These register bits control the hold time for the limiter, which is the time in ms
that the limiter
holds the attenuated level after the current input to the limiter function falls
below the limiter
threshold.
000
0x0 = 0 ms
0x1 = 10 ms
0x2 = 20 ms
0x3 = 30 ms
0x4 = 40 ms
0x5 = 50 ms
0x6 = 60 ms
0x7 = 70 ms
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