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參數資料
型號: TLV320AIC3120IRHBT
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: 78/150頁
文件大?。?/td> 1507K
代理商: TLV320AIC3120IRHBT
www.ti.com
SLAS653 – FEBRUARY 2010
Table 5-14. ADC FIR Filter Coefficients (continued)
Filter Coefficient
FIlter Coefficient RAM Location
Default (Reset) Values(1)
Fir12
Page 4 / register 38 and page 4 / register 39
0x0000
Fir13
Page 4 / register 40 and page 4 / register 41
0x0000
Fir14
Page 4 / register 42 and page 4 / register 43
0x0000
Fir15
Page 4 / register 44 and page 4 / register 45
0x7FFF (decimal 1.0 – LSB value)
Fir16
Page 4 / register 46 and page 4 / register 47
0x0000
Fir17
Page 4 / register 48 and page 4 / register 49
0x0000
Fir18
Page 4 / register 50 and page 4 / register 51
0x0000
Fir19
Page 4 / register 52 and page 4 / register 53
0x0000
Fir20
Page 4 / register 54 and page 4 / register 55
0x7FFF (decimal 1.0 – LSB value)
Fir21
Page 4 / register 56 and page 4 / register 57
0x0000
Fir22
Page 4 / register 58 and page 4 / register 59
0x0000
Fir23
Page 4 / register 60 and page 4 / register 61
0x0000
Fir24
Page 4 / register 62 and page 4 / register 63
0x0000
5.5.4.4
ADC Digital Decimation Filter Characteristics
The TLV320AIC3120 offers three different types of decimation filters. The integrated digital decimation
filter removes high-frequency content and downsamples the audio data from an initial sampling rate of
AOSR × fS to the final output sampling rate of fS. The decimation filtering is achieved using a higher-order
CIC filter followed by linear-phase FIR filters. The decimation filter cannot be chosen by itself; it is implicitly
set through the chosen processing block.
The following subsections describe the properties of the available filters A, B, and C.
5.5.4.4.1 Decimation Filter A
This filter is intended for use at sampling rates up to 48 kHz. When configuring this filter, the oversampling
ratio of the ADC can either be 128 or 64. For highest performance, the oversampling ratio must be set
to 128.
Filter A can also be used for 96 kHz at an AOSR of 64.
Table 5-15. ADC Decimation Filter A, Specification
Parameter
Condition
Value (Typical)
Unit
AOSR = 128
Filter-gain pass band
0…0.39 fS
0.062
dB
Filter-gain stop band
0.55…64 fS
–73
dB
Filter group delay
17/fS
s
Pass-band ripple, 8 ksps
0…0.39 fS
0.062
dB
Pass-band ripple, 44.1 ksps
0…0.39 fS
0.05
dB
Pass-band ripple, 48 ksps
0…0.39 fS
0.05
dB
AOSR = 64
Filter-gain pass band
0…0.39 fS
0.062
dB
Filter-gain stop band
0.55…32 fS
–73
dB
Filter group delay
17/fS
s
Pass-band ripple, 8 ksps
0…0.39 fS
0.062
dB
Pass-band ripple, 44.1 ksps
0…0.39 fS
0.05
dB
Pass-band ripple, 48 ksps
0…0.39 fS
0.05
dB
Pass-band ripple, 96 ksps
0…20 kHz
0.1
dB
Copyright 2010, Texas Instruments Incorporated
APPLICATION INFORMATION
33
Product Folder Link(s): TLV320AIC3120
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