Datasheet

W0002-01
Decay Time
Target
Level
Input
Signal
Output
Signal
AGC
Gain
Attack
Time
TLV320AIC3120
www.ti.com SLAS653A –FEBRUARY 2010–REVISED MAY 2012
Table 5-11. AGC Settings
CONTROL REGISTER
(1)
BIT FUNCTION
36 D5 (read-only) AGC saturation flag
39 D3 (read-only) ADC saturation flag
45 D6 (read-only) Signal to level setting of noise threshold
86 D7 AGC enable
86 D6–D4 Target level
87 D7–D6 Hysteresis
87 D5–D1 Noise threshold
88 D6–D0 Maximum PGA applicable
89 D7–D0 Time constants (attack time)
90 D7–D0 Time constants (decay time)
91 D4–D0 Debounce time (noise)
92 D3–D0 Debounce time (signal)
93 D7–D0 (Read-only) Gain applied by AGC
(1) All registers shown in this table are located on page 0.
Figure 5-2. AGC Characteristics
The AGC settings should be set based on user and system conditions, such as microphone selection and
sensitivity, acoustics (plastics) around the microphone which affect the microphone pattern, expected
distance and direction between microphone and sound source, acoustic background noise, etc.
Copyright © 2010–2012, Texas Instruments Incorporated APPLICATION INFORMATION 27
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