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參數(shù)資料
| 型號(hào)： | TSC2117IRGZT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, QCC48 |
| 封裝： | 7 X 7 MM, GREEN, PLASTIC, VQFN-48 |
| 文件頁(yè)數(shù)： | 117/192頁(yè) |
| 文件大?。?/td> | 2728K |
| 代理商： | TSC2117IRGZT |
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TSC2117
Low-Power Audio Codec With Embedded miniDSP, Stereo Class-D
Speaker Amplifier, and Smart Four-Wire Touch-Screen Controller
SLAS550A – APRIL 2009 – REVISED JUNE 2009
www.ti.com
Noise threshold is a reference level. If the input speech average value falls below the noise threshold,
the AGC considers it as a silence and hence brings down the gain to 0 dB in steps of 0.5 dB every sample
period and sets the noise-threshold flag. The gain stays at 0 dB unless the input speech signal average
rises above the noise-threshold setting. This ensures that noise is not amplified in the absence of speech.
The noise-threshold level in the AGC algorithm is programmable from –30 dB to –90 dB for the
microphone input. When the AGC noise threshold is set to –70 dB, –80 db, or –90 dB, the microphone
input maximum 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 prevent the AGC gain from cycling
between high gain and 0 dB when signals are near the noise threshold level. When the noise-threshold
flag is set, the status of the gain applied by the AGC and the saturation flag should be ignored.
Programming the noise debounce is done by writing to page 0/register 91, bits D4–D0. Programming the
signal debounce is done by writing to page 0/register 92, bits D3–D0.
Max PGA applicable allows the user to restrict maximum gain applied by AGC. This can be used for
limiting PGA gain in situations where environmental noise is greater than the programmed noise threshold.
Microphone input maximum PGA can be programmed from 0 dB to 59.5 dB in steps of 0.5 dB.
Programming the maximum PGA gain allowed by the AGC is done by writing to page 0/register 88,
bits D6–D0.
See Table 5-15 for various AGC programming options. AGC can be used only if the microphone input is
routed to the ADC channel.
Table 5-15. AGC Settings(1)
CONTROL REGISTER
BIT
FUNCTION
36
D5 (Read-only)
AGC saturation flag
39
D3 (Read-only)
ADC saturation flag
45
D6 (Read-only)
Signal to level setting of noise threshold
86
D7
AGC enable
86
D6–D4
Target level
87
D7–D6
Hysteresis
87
D5–D1
Noise threshold
88
D6–D0
Maximum PGA applicable
89
D7–D0
Time constants (attack time)
90
D7–D0
Time constants (decay time)
91
D4–D0
Debounce time (noise)
92
D3–D0
Debounce time (signal)
93
D7–D0 (Read-only)
Gain applied by AGC
(1)
All registers shown in this table are located on page 0.
APPLICATION INFORMATION
30
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSC2117IRGZT | 制造商:Texas Instruments 功能描述:Touch Screen Controller IC |
| TSC22 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:EURO TERMINAL BLOCKS |
| TSC2200 | 制造商:BB 制造商全稱:BB 功能描述:PDA ANALOG INTERFACE CIRCUIT |
| TSC2200EVM | 功能描述:觸摸傳感器開(kāi)發(fā)工具 Touch Screen Contr Eval Mod RoHS:否 制造商:Cypress Semiconductor 工具用于評(píng)估: 接口類型: 工作電壓: 最大工作溫度: |
| TSC2200IPW | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/12-Bit 125KHz ADC & Key Ifc 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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