
ISD5008
Publication Release Date: Oct 31 2008
- 14 -
Revision 1.2
TABLE 5: AUXIN AMPLIFIER GAIN SETTINGS
Setting
(1)
0TLP Input
VPP
(3)
CFG0
Gain
(2)
Array In/Out
VPP
ANA OUT
VPP
(4)
AXG1
AXG0
0 dB
.694
0
1.00
.694
3 dB
.491
0
1
1.41
.694
6 dB
.347
1
0
2.00
.694
9 dB
.245
1
2.82
.694
NOTES:
1.
Gain from AUX IN to ANA OUT
2.
Gain from AUX IN to ARRAY IN
3.
0TLP Input is the reference Transmission Level Point that is used for testing. This level is typically 3 dB
below clipping.
4.
Differential
6.2.4
ACAP (AGC Capacitor)
This pin provides the capacitor connection for setting the parameters of the microphone AGC circuit. It
should have a 4.7
μF capacitor connected to ground. It cannot be left floating. This is because the
capacitor is also used for the AutoMute circuit. This circuit reduces the amount of noises present in the
output during quiet pauses. Tying this pin to ground gives maximum gain; to VCCA gives minimum gain
for the AGC amplifier but will cancel the AutoMute function.