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參數資料
型號： TLV320AIC3111IRHBT
廠商： TEXAS INSTRUMENTS INC
元件分類： 音頻／視頻放大
英文描述： AUDIO AMPLIFIER, PQCC32
封裝： 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件頁數： 89/156頁
文件大小： 1701K
代理商： TLV320AIC3111IRHBT
0
–20
–40
–60
–80
–100
–120
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
Magnitude
–
dB
FrequencyNormalizedtofS
ADCChannelResponseforDecimationFilterC
(RedLineCorrespondsto –60dB)
SLAS644B – JULY 2009 – REVISED OCTOBER 2009
www.ti.com
5.5.4.4.3 Decimation Filter C
Filter C along with an AOSR of 32 is specially designed for 192-ksps operation for the ADC. The pass
band, which extends up to 0.11 × fS (corresponding to 21 kHz), is suited for audio applications.
Table 5-22. ADC Decimation-Filter-C Specifications
Parameter
Condition
Value (Typical)
Unit
Filter gain from 0 to 0.11 fS
0…0.11 fS
±0.033
dB
Filter gain from 0.28 fS to 16 fS
0.28 fS…16 fS
–60
dB
Filter group delay
11/fS
s
Pass-band ripple, 8 ksps
0…0.11 fS
0.033
dB
Pass-band ripple, 44.1 ksps
0…0.11 fS
0.033
dB
Pass-band ripple, 48 ksps
0…0.11 fS
0.032
dB
Pass-band ripple, 96 ksps
0…0.11 fS
0.032
dB
Pass-band ripple, 192 ksps
0…20 kHz
0.086
dB
Figure 5-15. ADC Decimation-Filter-C Frequency Response
5.5.4.5
ADC Data Interface
The decimation filter and signal processing block in the ADC channel pass 32-bit data words to the audio
serial interface once every cycle of ADC_fS. During each cycle of ADC_fS, a pair of data words (for left
and right channel) is passed. The audio serial interface rounds the data to the required word length of the
interface before converting to serial data. Because the TLV320AIC3111 has only a mono ADC, it passes
the same data to both the left and right channels of the audio serial interface.
5.5.5
Updating ADC Digital Filter Coefficients During Record
When it is required to update the ADC digital filter coefficients during record, care must be taken to avoid
click and pop noise or even a possible oscillation noise. These artifacts can occur if the ADC coefficients
are updated without following the proper update sequence. The correct sequence is shown in Figure 5-16.
The values for the times listed are conservative and should be used for software purposes.
38
APPLICATION INFORMATION
Copyright 2009, Texas Instruments Incorporated
Product Folder Link(s): TLV320AIC3111
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