參數(shù)資料
型號： 6PAIC3106IRGZRQ1
廠商： Texas Instruments
文件頁數(shù)： 32/103頁
文件大?。?/td> 0K
描述： IC AUDIO CODEC STEREO 48-QFN
標準包裝： 1
類型： 立體聲音頻
數(shù)據(jù)接口： 串行
分辨率（位）： 24 b
ADC / DAC 數(shù)量： 2 / 2
三角積分調(diào)變： 是
S/N 比，標準 ADC / DAC (db)： 92 / 102（差分），92 / 95（單端）
動態(tài)范圍，標準 ADC / DAC (db)： 91 / 99（差分），91 / 92（單端）
電壓 - 電源，模擬： 2.7 V ~ 3.6 V
電壓 - 電源，數(shù)字： 1.1 V ~ 3.6 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 48-VFQFN 裸露焊盤
供應商設備封裝： 48-VQFN 裸露焊盤（7x7）
包裝： 標準包裝
產(chǎn)品目錄頁面： 1077 (CN2011-ZH PDF)
其它名稱： 296-25253-6
SLAS663B – AUGUST 2009 – REVISED OCTOBER 2012
Decay time determines how quickly the PGA gain is increased when the input signal is too low. It can be varied
in the range from 0.05 s to 22.4 s. The extended Right Channel Decay time can be programmed by writing to
Page 0, Registers 104, and Left Channel is programmed by writing to Page 0, Register 106.
The actual AGC decay time maximum is based on a counter length, so the maximum decay time will scale with
the clock set up that is used. The table below shows the relationship of the NADC ratio to the maximum time
available for the AGC decay. In practice, these maximum times are extremely long for audio applications and
should not limit any practical AGC decay time that is needed by the system.
Table 4. AGC Decay Time Restriction
NADC RATIO
MAXIMUM DECAY TIME (seconds)
1.0
4.0
1.5
5.6
2.0
8.0
2.5
9.6
3.0
11.2
3.5
11.2
4.0
16.0
4.5
16.0
5.0
19.2
5.5
22.4
6.0
22.4
Noise gate threshold determines the level below which if the input speech average value falls, AGC considers it
as a silence and hence brings down the gain to 0 dB in steps of 0.5 dB every FS and sets the noise threshold
flag. The gain stays at 0 dB unless the input speech signal average rises above the noise threshold setting. This
ensures that noise does not get gained up in the absence of speech. Noise threshold level in the AGC algorithm
is programmable from –30 dB to –90 dB relative to full scale. A disable noise gate feature is also available. This
operation includes programmable debounce and hysteresis functionality to avoid the AGC gain from cycling
between high gain and 0 dB when signals are near the noise threshold level. When the noise threshold flag is
set, the status of gain applied by the AGC and the saturation flag should be ignored.
Maximum PGA gain applicable allows the user to restrict the maximum PGA gain that can be applied by the
AGC algorithm. This can be used for limiting PGA gain in situations where environmental noise is greater than
programmed noise threshold. It can be programmed from 0 dB to 59.5 dB in steps of 0.5 dB.
34
Copyright 2009–2012, Texas Instruments Incorporated
Product Folder Links: TLV320AIC3106-Q1
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