TLV320AIC3120_16 Datasheet, PDF (35/160 Pages) Texas Instruments – TLV320AIC3120 Low-Power Mono Audio Codec With Embedded miniDSP and Mono Class-D Speaker Amplifier

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TLV320AIC3120
SLAS653B – FEBRUARY 2010 – REVISED AUGUST 2016
FILTER
COEFFICIENT
FIR13
FIR14
FIR15
FIR16
FIR17
FIR18
FIR19
FIR20
FIR21
FIR22
FIR23
FIR24
Table 7-15. ADC FIR Filter Coefficients (continued)
FILTER COEFFICIENT RAM LOCATION
Page 4 / register 40 and page 4 / register 41
Page 4 / register 42 and page 4 / register 43
Page 4 / register 44 and page 4 / register 45
Page 4 / register 46 and page 4 / register 47
Page 4 / register 48 and page 4 / register 49
Page 4 / register 50 and page 4 / register 51
Page 4 / registe 52 and page 4 / register 53
Page 4 / register 54 and page 4 / register 55
Page 4 / register 56 and page 4 / register 57
Page 4 / register 58 and page 4 / register 59
Page 4 / register 60 and page 4 / register 61
Page 4 / register 62 and page 4 / register 63
DEFAULT (RESET) VALUES – NOT VALID FOR THE FIR FILTER –
MUST BE REPROGRAMMED BY USER
0x0000
0x0000
0x7FFF (decimal 1.0 – LSB value)
0x0000
0x0000
0x0000
0x0000
0x7FFF (decimal 1.0 – LSB value)
0x0000
0x0000
0x0000
0x0000
7.3.10.4.4 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 × f_S to the final output sampling rate of f_S. 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.
7.3.10.4.4.1 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 7-16. ADC Decimation-Filter-A Specifications
PARAMETER
AOSR = 128
Filter gain pass band
Filter gain stop band
Filter group delay
Pass-band ripple, 8 ksps
Pass-band ripple, 44.1 ksps
Pass-band ripple, 48 ksps
AOSR = 64
Filter gain pass band
Filter gain stop band
Filter group delay
Pass-band ripple, 8 ksps
Pass-band ripple, 44.1 ksps
Pass-band ripple, 48 ksps
Pass-band ripple, 96 ksps
CONDITION
0…0.39 f_S
0.55…64 f_S
0…0.39 f_S
0…0.39 f_S
0…0.39 f_S
0…0.39 f_S
0.55…32 f_S
0…0.39 f_S
0…0.39 f_S
0…0.39 f_S
0…20 kHz
VALUE (TYPICAL)
0.062
–73
17/f_S
0.062
0.05
0.05
0.062
–73
17/f_S
0.062
0.05
0.05
0.1
UNIT
dB
dB
s
dB
dB
dB
dB
dB
s
dB
dB
dB
dB
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