- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98303 > TSC2301IPAGRG4 (TEXAS INSTRUMENTS INC) SPECIALTY CONSUMER CIRCUIT, PQFP64 PDF資料下載
參數(shù)資料
| 型號： | TSC2301IPAGRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費(fèi)家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP64 |
| 封裝： | GREEN, PLASTIC, TQFP-64 |
| 文件頁數(shù)： | 68/95頁 |
| 文件大?。?/td> | 1322K |
| 代理商： | TSC2301IPAGRG4 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁當(dāng)前第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁
www.ti.com
TSC2301
SLAS371D – SEPTEMBER 2002 – REVISED AUGUST 2004
Audio Data Converters
The TSC2301 includes a stereo 20-bit audio DAC and a stereo 20-bit audio ADC. The DAC and ADC are both
capable of operating at 8 kHz, 11.025 kHz, 12 kHz, 16 kHz, 22.05 kHz, 24 kHz, 32 kHz, 44.1 kHz, or 48 kHz.
The DAC and ADC must operate at the same sampling rate.
When the ADC or DAC is operating, the part requires an audio MCLK input, which should be synchronous to the
I2S bus clock. The MCLK can be 256/384/512 times the I2S LRCLK rate. An internal PLL takes any of these
possible input clocks and generates a digital clock for use by the internal circuitry of either 44.1 kHz x 512 =
22.5792 MHz (when 44.1 kHz submultiple sample-rates are selected) or 48 kHz x 512 = 24.576 MHz (when 48
kHz submultiple sample-rates are selected). The user is required to set the MCLK bits (Bits[7:6], Reg 00h, Pg 2)
to tell the part the ratio between MCLK and the I2S LRCLK rate (there is no specific phase alignment requirement
between MCLK and BCLK). The user is also required to set the I2SFS bits (Bits[5:2], Reg 00h, Pg 2) to tell the
part what sample rate is in use. When the user is using either 44.1 kHz or 48-kHz sampling rates, and providing
a 512 x Fs MCLK, the internal PLL is powered down, as MCLK can be used directly to clock the internal circuitry.
This reduces power consumption.
If the user wishes to change sampling rates, the data converters (both DACs and ADCs) must be muted, then
powered down. The LRCLK and BCLK rates must then be changed. Next the user must write the appropriate
settings to the MCLK, I2SFS, and I2SFM bits, then power up the data converters. Finally, the data converters
can be unmuted.
Due to the wide supply range over which this part must operate, the audio does not operate on an internal
reference voltage. The common-mode voltage that the single-ended audio signals are referenced to is set by a
divider between the analog supplies and is given by 0.4 x AVDD. The reference voltages used by the audio
codec must be provided as inputs to the part at the Vref+/Vref- pins and are intended to be connected to the
same voltage levels as AVDD and AGND, respectively. Because of this arrangement, the voltages applied to
AVDD, AGND, Vref+, and Vref- should be kept as clean and noise-free as possible.
DAC Digital Volume Control
The DAC digital effects processing block implements a digital volume control that can be set through the SPI
registers. The volume level can be varied from 0 dB to -63.5 dB in 0.5-dB steps independently for each channel.
The user can mute each channel independently by setting the mute bits in the DAC volume control register (Reg
02h, Pg 2). There is a soft-stepping algorithm included in this block, which only changes the actual volume every
20 s, either up or down, until the desired volume is reached. This speed of soft-stepping can be slowed to once
every 40 s through the SSRTE bit (Bit 1, Reg 04h, Pg 2).
Because of this soft-stepping, the host does not know whether the DAC has actually been fully muted or not.
This may be important if the host wishes to mute the DAC before making a significant change, such as changing
sample rates. In order to help with this situation, the part provides a flag back to the host via a read-only SPI
register bit (Bit 0, Reg 04h, Pg 2) that alerts the host when the part has completed the soft-stepping, and the
actual volume has reached the desired volume level.
The part also includes functionality to detect when the user switches on or off the de-emphasis or bass-boost
functions, and to first soft-mute the DAC volume control, then change the operation of the digital effects
processing, then soft-unmute the part. This avoids any possible pop/clicks in the audio output due to
instantaneous changes in the filtering. A similar algorithm is used when first powering up or down the DAC/ADC.
The circuit begins operation at power-up with the volume control muted, then soft-steps it up to the desired
volume level slowly. At power-down, the logic first soft-steps the volume down to a mute level, then powers down
the circuitry.
70
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TSC2302IRGZRG4 | SPECIALTY CONSUMER CIRCUIT, PQCC48 |
| TSDC4872IJT | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| TS4872IJT | 1 W, 1 CHANNEL, AUDIO AMPLIFIER, PBGA8 |
| TSH103ID | 3 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| TSH103IDT | 3 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TSC2301IZQZ | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec 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 |
| TSC2301IZQZR | 功能描述:觸摸屏轉(zhuǎn)換器和控制器 Prog 4-Wire w/20-Bit Stereo Audio Codec 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 |
| TSC2301PAG | 制造商:TI 制造商全稱:Texas Instruments 功能描述:PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
| TSC2301PAGR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
| TSC2302 | 制造商:BB 制造商全稱:BB 功能描述:PROGRAMMABLE TOUCH SCREEN CONTROLLER WITH STEREO AUDIO CODEC |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。