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參數(shù)資料
| 型號： | P95020NQG |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 電源管理 |
| 英文描述： | 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, QCC132 |
| 封裝： | 10 X 10 MM, 0.85 MM HEIGHT, QFN-132 |
| 文件頁數(shù)： | 87/169頁 |
| 文件大?。?/td> | 4297K |
| 代理商： | P95020NQG |
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IDTP95020
Product Datasheet
September 2, 2011 Revision 1.3 Final
24
2011 Integrated Device Technology, Inc.
Audio – Automatic Gain Control
The IDTP95020 incorporates digital automatic gain control
in the ADC1 record path to help maintain a constant
record level for voice recordings. The AGC maintains the
recording level by monitoring the output of the ADC and
adjusting the Boost (analog for analog microphone path or
digital for digital microphone path) and digital record gain
to compensate for varying input levels. While the AGC is
enabled, the digital record gain and boost register values
are ignored.
Figure 7 – Automatic Gain Control
The AGC target level may be set from -1.5 dB to -22.5 dB
relative to the ADC full scale output code in 1.5 dB steps.
The maximum gain allowed may be programmed to
prevent the AGC from using the entire gain range. The
AGC may be applied to either both channels or only the
right or left channel. The AGC uses both channels to
determine proper record level unless only one channel is
selected. When only one channel is enabled, the other
channel is ignored and that channel’s gain is controlled by
its record gain and boost register values.
Delay time is the amount of delay between when the peak
record level falls below the target level and when the AGC
starts to adjust gain. The delay time may be set from 0
ms to 5.9 seconds in 16 steps. Each step is twice as long
as the previous step where 0 is the first step.
Each additional step may be calculated by:
((8*2n)/44100) seconds
where n is the register value from 1 to 15
Decay time is the time that the AGC takes to ramp up
across its gain range. The time needed to adjust the
recording level depends on the decay time and the
amount of gain adjustment needed. If the input level is
close to the target level then a relatively small gain
adjustment will be needed and will take much less than
the programmed decay time. Decay time is adjustable
from 23.2 ms to 23.8 seconds and may be calculated as
(2n+10/44100) where n is the register value from 0 to 10.
Register values above 10 set the decay to 23.8 seconds.
Attack time is the time that it takes the AGC to ramp down
across its gain range. As with the decay time, the actual
time needed to reach the target recording level depends
on the attack time and the gain adjustment needed. The
attack time is adjustable from 5.8 ms to 5.9 seconds and
may be calculated as (2n+8/44100) where n is the register
value from 0 to 10. Register values above 10 set the
decay to 5.9 seconds.
The IDTP95020 also provides a peak limiter function.
When the AGC is on, quiet passages will cause the gain
to be set to the maximum level allowed. When a large
input signal follows a quiet passage, many samples will
become clipped as the AGC adjusts the gain to reach the
target record level. Long attack times aggravate this
situation. To reduce the number of clipped samples the
peak limiter will force the attack rate to be as fast as
possible (equivalent to zero (0) value in the attack register)
until the record level is 87.5% of full scale or less.
To prevent excessive hiss during quiet periods, a signal
threshold level may be programmed to prevent the AGC
circuit from increasing the gain in the absence of audio.
This is often referred to as a ‘noise gate’ or ‘squelch’
function. The signal threshold may be programmed from -
72 dB FS to -24 dB FS in 1.5 dB increments.
Under some circumstances, it is desirable to force a
minimum amount of gain in the record path. When the
AGC is in use, the minimum gain may be set from 0 to 30
dB to compensate for microphone sensitivity or other
needs.
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