FAB2200 Datasheet, PDF (29/33 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
0x0B
0
AGCATTACK
0
AGCRELEASE
default
0
0
0
0
0
0
0
0
AGCATTACK
AGCATTACK sets the attack speed for the speaker amplifier’s AGC according to Table 12.
AGCRELEASE
AGCRELEASE sets the release speed for the speaker amplifier’s AGC according to Table 13.
Address
B7
B6
B5
B4
B3
B2
B1
B0
0x0C
0
0
AGCMIN
default
0
0
0
0
0
0
0
0
AGCMIN
AGCMIN sets the minimum gain for the speaker amplifier’s AGC according to Table 11.
Address
B7
B6
B5
B4
B3
B2
B1
B0
0x0D
0
0
PRESENTGAIN
PRESENTGAIN
(Read only)
PRESENTGAIN is the actual gain setting for the speaker amplifier according to Table 11. The target value for
PRESENTGAIN is set by STARTGAIN. However, PRESENTGAIN may be changed automatically by the AGC or the
noise gate.
PRESENTGAIN does not include PGAINxx. Gain for the entire speaker amplifier signal path is defined by PGAINxx +
PRESENTGAIN.
Address
B7
B6
B5
B4
B3
B2
B1
B0
0x0E
0
0
STARTGAIN
default
0
0
0
0
0
0
0
0
STARTGAIN
STARTGAIN is the volume setting for the speaker amplifier according to Table 11.
Address B7
B6
B5
B4
B3
B2
B1
B0
0x0F
0
0
MCSSMT
SSMT
default
0
0
1
0
0
0
0
0
SSMT
Sets the spread-spectrum modulation of the class-D amplifier. See Table 20 for the amount of modulation. A setting
of 000 results in a ±5.3% modulation in the speaker amplifier’s output frequency. A setting of 100 disables spread-
spectrum modulation.
© 2009 Fairchild Semiconductor Corporation
FAB2200 • Rev. 1.0.1
29
www.fairchildsemi.com