FAB2210 Datasheet, PDF (23/35 Pages) Fairchild Semiconductor – Audio Subsystem with Class-G Headphone and 3.3W Mono Class-D Speaker with Dynamic Range Compression

SRST
1=Low-power Standby Mode. All registers are reset to their default values. All I²C write commands to bits other than
SRST are ignored.
0=Normal operation.
ADDR
0x81
default
B7
B6
DRC_MODE[1:0]
0
0
B5
B4
DATRT[1:0]
0
1
B3
B2
NG_ATRT[1:0]
1
1
B1
B0
0
MODESEL
0
0
DRC_MODE[1:0]
Sets the DRC’s compression ratio.
DRC_MODE[1:0]
11
10
01
00
Compression Ratio
Reserved
Reserved
2:1
Off
DATRT[1:0]
Sets the DRC’s attack and release times. To avoid extraneous noise, do not change this setting while the speaker
amplifier is on.
DATRT[1:0]
11
10
01
00
Attack Time (ms/step)
1.0
0.5
0.1
0.1
Release Time (ms/step)
200
200
200
20
NG_ATRT[1:0], MODESEL
Sets the noise gate attack, hold, and release times for the headphone and speaker amplifiers. To avoid extraneous
noise, do not change this setting while the headphone or speaker amplifiers are on.
MODESEL NG_ATRT[1:0]
Attack Time
(ms/step)
Release Time
Release Time
(µs/step) SOFTVOL=0 (µs/step) SOFTVOL=1
1
11
800
1
10
400
1
01
100
1
00
25
0
11
800
0
10
400
0
01
100
0
00
25
200
200
200
200
1400
1400
1400
1400
2000
2000
2000
2000
1400
1400
1400
1400
Hold
Time
(ms)
44
44
44
44
44
44
44
44
ADDR
0x82
Default
B7
B6
B5
DPLT[2:0]
0
0
0
© 2011 Fairchild Semiconductor Corporation
FAB2210 • Rev. 1.1.1
B4
B3
B2
HP_NG_RAT[2:0]
1
0
0
23
B1
B0
HP_NG_ATT[1:0]
0
0
www.fairchildsemi.com