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| 型號： | TSC2100IDAR |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | Codec |
| 英文描述： | PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH INTEGRATED STEREO AUDIO CODEC AND HEADPHONE/SPEAKER AMPLIFIER |
| 中文描述： | 可編程觸摸屏控制器，它集成立體聲音頻編解碼器和耳機/揚聲器放大器 |
| 文件頁數(shù)： | 30/71頁 |
| 文件大小： | 717K |
| 代理商： | TSC2100IDAR |
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SLAS378 NOVEMBER 2003
www.ti.com
30
Table 3. AGC Settings
MIC INPUT
CONTROL REGISTER
01H
01H
01H
06H
04H
1DH
1EH
1EH
1EH
01H
04H
06H
BIT
D0
D7D5
D4D1
D5D4
D11
D10D9
D8D6
D5D3
D15D9
D15D8
D0
D3
AGC enable
Target gain
Time constants (attack and decay time)
Noise threshold
Noise threshold flag
Hysteresis
Debounce time (normal to silence mode)
Debounce time (silence to normal mode)
Max PGA applicable
Gain applied by AGC
Saturation flag
Clip stepping enable
NOTE:All settings shown in Table 2 are located in page2 of control registers.
STEREO AUDIO DAC
Each channel of the stereo audio DAC consists of a digital audio processing block, a digital interpolation filter, digital
delta-sigma modulator, and an analog reconstruction filter. The DAC is designed to provide enhanced performance at low
sample rates through increased oversampling and image filtering, thereby keeping quantization noise generated within the
delta-sigma modulator and signal images strongly suppressed within the audio band to beyond 20 kHz. This is realized
by keeping the upsampled rate constant at 128 x Fsref and changing the oversampling ratio as the input sample rate is
changed. For Fsref of 48 kHz, the digital delta-sigma modulator always operates at a rate of 6.144 MHz. This ensures that
quantization noise generated within the delta-sigma modulator stays low within the frequency band below 20 kHz at all
sample rates. Similarly, for Fsref rate of 44.1 kHz, the digital delta-sigma modulator always operates at a rate of 5.6448
MHz.
Digital Audio Processing
The DAC channel consists of optional filters for de-emphasis and bass, treble, midrange level adjustment, or speaker
equalization. The de-emphasis function is only available for sample rates of 32 kHz, 44.1 kHz, and 48 kHz. The transfer
function consists of a pole with time constant of 50
μ
s and a zero with time constant of 15
μ
s. Frequency response plots
are given in the
Audio Codec Filter Frequency Responses
section of this data sheet.
The DAC digital effects processing block also includes a fourth order digital IIR filter with programmable coefficients (one
set per channel). The filter is implemented as cascade of two biquad sections with frequency response given by:
N0
2
N1
z
1
N2
z
2
32768
2
D1
z
1
D2
z
2
N3
2
N4
z
1
N5
z
2
32768
2
D4
z
1
D5
z
2
The N and D coefficients are fully programmable, and the entire filter can be enabled or bypassed. The coefficients for this
filter implement a variety of sound effects, with bass-boost or treble boost being the most commonly used in portable audio
applications. The default N and D coefficients in the part are given by:
N0 = N3 = 27619
N1 = N4 = 27034
N2 = N5 = 26461
D1 = D4 = 32131
D2 = D5 = 31506
and implement a shelving filter with 0 dB gain from dc to approximately 150 Hz, at which point it rolls off to a 3 dB attenuation
for higher frequency signals, thus giving a 3-dB boost to signals below 150 Hz. The N and D coefficients are represented
by 16-bit twos complement numbers with values ranging from –32768 to +32767. Frequency response plots are given in
the
Audio Codec Filter Frequency Responses
section of this data sheet.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSC2100IDARG4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/Ster Codec & Hdph/Spk Amp RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| TSC2100IRHB | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/Ster Codec & Hdph/Spk Amp RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| TSC2100IRHBG4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/Ster Codec & Hdph/Spk Amp RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| TSC2100IRHBR | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/Ster Codec & Hdph/Spk Amp RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
| TSC2100IRHBRG4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/Ster Codec & Hdph/Spk Amp RoHS:否 制造商:Microchip Technology 類型:Resistive Touch Controllers 輸入類型:3 Key 數(shù)據(jù)速率:140 SPS 分辨率:10 bit 接口類型:4-Wire, 5-Wire, 8-Wire, I2C, SPI 電源電壓:2.5 V to 5.25 V 電源電流:17 mA 工作溫度:- 40 C to + 85 C 封裝 / 箱體:SSOP-20 |
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