FAB2200 Datasheet, PDF (27/33 Pages) Fairchild Semiconductor – Audio Subsystem with Stereo Class-G Headphone Amplifier and 1.2W Mono Class-D Speaker Amplifier

Address B7
B6
B5
B4
B3
B2
B1
B0
0x05
0
0
HPLVOL
0
default
0
0
0
0
0
0
0
0
0x06
0
0
HPRVOL
0
default
0
0
0
0
0
0
0
0
HPxVOL
HPxVOL sets the gain of the headphone amplifiers according to Table 19.
HPxVOL does not include PGAINxx. Gain for the entire headphone amplifier signal path is defined by PGAINxx +
HPxVOL.
Table 19. Headphone Amplifier Gain Settings
HPxVOL [4:0]
Gain (dB)
HPxVOL [4:0]
Gain (dB)
00000
mute
10000
-9
00001
-53
10001
-8
00010
-49
10010
-7
00011
-45
10011
-6
00100
-41
10100
-5
00101
-37
10101
-4
00110
-33
10110
-3
00111
-29
10111
-2
01000
-25
11000
-1
01001
-23
11001
0
01010
-21
11010
1
01011
-19
11011
2
01100
-17
11100
3
01101
-15
11101
4
01110
-13
11110
5
01111
-11
11111
6
Address
0x07
default
B7
HPNGZRA
0
B6
B5
B4
HPNGTHRESH
0
0
0
B3
B2
HPNGZRR
0
0
B1
B0
HPNGTIME
0
0
HPNGZRA
1 = The headphone noise gate attack function obeys headphone zero-crossing detection and ramp settings.
0 = The headphone noise gate attack (mute) function occurs immediately rather than waiting for zero-crossing
detection or ramping.
HPNGTHRESH
HPNGTHRESH sets the threshold voltage for the headphone amplifiers’ noise gate function according to Table 1.
HPNGZRR
1 = The headphone noise gate release (un-mute) function obeys headphone zero-crossing detection and ramp
settings.
0 = The headphone noise gate release (un-mute) function occurs immediately rather than waiting for zero-crossing
detection or ramping.
HPNGTIME
HPNGTIME sets the timing for the headphone amplifiers’ noise gate function according to Table 6.
© 2009 Fairchild Semiconductor Corporation
FAB2200 • Rev. 1.0.1
27
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