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參數(shù)資料
| 型號(hào)： | TSC2111IRGZT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 0.4 W, 1 CHANNEL, AUDIO AMPLIFIER, QCC48 |
| 封裝： | PLASTIC, QFN-48 |
| 文件頁數(shù)： | 18/99頁 |
| 文件大小： | 1143K |
| 代理商： | TSC2111IRGZT |
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TSC2111
SLAS495A JUNE 2006 REVISED OCTOBER 2007
www.ti.com
25
upon power down, the PGA soft-steps the volume to mute before shutting down. A readonly flag (D7 control
register 1FH/Page 2) is set whenever the gain applied by PGA equals the desired value set by the register. The
soft-stepping control can be disabled by the programming D12=1 in register 1DH of Page 2. When soft-stepping
is enabled and ADC power down register is written, MCLK should be running to ensure that soft-stepping to
mute has completed. MCLK can be shut down once Cell PGA power down flag is set.
Delta-Sigma ADC
The analog-to-digital converter has a delta-sigma modulator with a 128 times oversampling ratio. The ADC can
support maximum output rate of 53 kHz.
Decimation Filter
The audio ADC includes an integrated digital decimation filter that removes high frequency content and
downsamples the audio data from an initial sampling rate of 128 times Fs to the final output sampling rate of
Fs. The decimation filter provides a linear phase output response with a group delay of 17/Fs. The –3 dB
bandwidth of the decimation filter extends to 0.45 Fs and scales with the sample rate (Fs).
Programmable High Pass Filter
The ADC channel has a programmable high-pass filter whose cutoff frequency can be programmed through
control register. By default the high pass filter is off. The high-pass filter is a first order IIR filter. This filter can
be used to remove the DC component of the input signal and offset of the ADC channel.
Automatic Gain Control (AGC)
The TSC2111 includes Automatic gain control (AGC) for Microphone Inputs (MICIN_HED or MICIN_HND) and
Cell-phone input (CP_IN). AGC can be used to maintain nominally constant output signal amplitude when
recording speech signals. This circuitry automatically adjusts the PGA gain as the input signal becomes overly
loud or very weak, such as when a person speaking into a microphone moves closer or farther from the
microphone. The AGC algorithm has several programmable settings, including target gain, attack and decay
time constants, noise threshold, and max PGA applicable that allow the algorithm to be fine tuned for any
particular application. The algorithm uses the absolute average of the signal (which is the average of the
absolute value of the signal) as a measure of the nominal amplitude of the output signal.
Target gain represents the nominal output level at which the AGC attempts to hold the ADC output signal level.
The TSC2111 allows programming of eight different target gains, which can be programmed from –5.5 dB to
–24 dB relative to a full-scale signal. Since the TSC2111 reacts to the signal absolute average and not to peak
levels, it is recommended that the target gain be set with enough margin to avoid clipping at the occurrence
of loud sounds.
Attack time determines how quickly the AGC circuitry reduces the PGA gain when the input signal is too loud.
It can be varied from 8 ms to 20 ms.
Decay time determines how quickly the PGA gain is increased when the input signal is too low. It can be varied
in the range from 100 ms to 500 ms.
Noise threshold determines level below which if the input speech average value falls, AGC considers it as a
silence and hence brings down the gain to 0 dB in steps of 0.5 dB every FS and sets noise threshold flag. The
gain stays at 0 dB unless the input speech signal average rises above noise threshold setting. This ensures
that noise does not get gained up in the absence of speech. Noise threshold level in the AGC algorithm is
programmable from 30dB to 90 dB for microphone input, and from 30 dB to 60 dB for cell-phone input.
When AGC Noise Threshold is set to 70 dB, 80 dB, or 90 dB, the microphone input Max PGA applicable
setting must be greater than or equal to 11.5 dB, 21.5 dB, or 31.5 dB respectively. This operation includes
debounce and hysteresis to avoid the AGC gain from cycling between high gain and 0 dB when signals are near
the noise threshold level. When noise threshold flag is set, status of gain applied by AGC and saturation flag
should be ignored.
Max PGA applicable allows user to restrict maximum gain applied by AGC. This can be used for limiting PGA
gain in situations where environment noise is greater than programmed noise threshold. Microphone input Max
PGA can be programmed from 0 dB to 59.5 dB in steps of 0.5 dB. Cell-phone input Max PGA can be
programmed from 34.5 dB to 0.5 dB in steps of 0.5 dB, as well as +12 dB.
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| TSC2111IRGZTG4 | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 SMART 4-Wire with Audio 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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