參數(shù)資料
型號(hào)： TSC2301IZQZ
廠商： TEXAS INSTRUMENTS INC
元件分類： 消費(fèi)家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PBGA120
封裝： GREEN, PLASTIC, VFBGA-120
文件頁數(shù)： 70/95頁
文件大?。?/td> 1322K
代理商： TSC2301IZQZ
www.ti.com
Default Bass-Boost Transfer Function 48 kHz Mode
1
10
100
1000
10000
100000
Frequency (Hz)
0
–0.5
–1
–1.5
–2
–2.5
–3
–3.5
Gain
(dB)
TSC2301
SLAS371D – SEPTEMBER 2002 – REVISED AUGUST 2004
N0 = N3 = 27618
D1 = D4 = 32130
N1 = N4 = -27033
D2 = D5 = -31505
N2 = N5 = 26461
which implements the bass-boost transfer function shown in Figure 77, having a 3-dB attenuation for signals
above approximately 150 Hz when operating at a 48-kHz sampling rate. All coefficients are represented by 16-bit
twos complement integers with values ranging from -32768 to 32767.
Figure 77. Transfer Function of Default Bass-Boost Filter Coefficients at 48-kHz Sampling Rate
Audio ADC
The audio ADC consists of a 4th order multi-bit analog delta-sigma modulator, followed by a digital decimation
filter. The digital output data is then passed to the bus interface for transmission back to the CPU.
The analog modulator is a fully differential switched-capacitor design with multi-bit quantizer and dynamic
element matching to avoid mismatch errors. The modulator operates at an oversampling ratio of 128 for all
sample rates. The input to the ADC is filtered by a single-pole analog filter with -3-dB point at approximately 500
kHz for antialiasing. This analog filter uses a single off-chip 1 nF cap per ADC (at the AFILT pins) and on-chip
resistor.
The digital decimation filter block includes a high-pass IIR filter for the purpose of removing any dc or
sub-audio-frequency component from the signal. Since such a low frequency filter can have significant settling
time, the filter has an adjustable cutoff frequency, in order to allow the host to set a faster settling time initially,
then later switch it back to a level that does not affect the audio band. The settings for this high-pass filter are:
HPF -3-dB frequency:
0.000019 Fs (0.912 Hz at Fs = 48 kHz)
0.000078 Fs (3.744 Hz at Fs = 48 kHz)
0.1 Fs (4.8 kHz at Fs = 48 kHz)
The filter block provides an audio passband ripple of +/-0.03 dB over a passband from 0 Hz to 0.454 sampling
frequency (Fs), and 70-dB minimum stopband attenuation from 0.548 Fs to 64 Fs.
72
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