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參數(shù)資料
| 型號： | TWL1101PFBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP48 |
| 封裝： | PLASTIC, TQFP-48 |
| 文件頁數(shù)： | 26/31頁 |
| 文件大?。?/td> | 408K |
| 代理商： | TWL1101PFBR |
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TWL1101
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS074A – MAY 1998 REVISED MARCH 1999
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
functional description
power-on/reset
The power for the various digital and analog circuits is separated to improve the noise performance of the
device. When digital power (DVDD) is first applied, power-on reset circuitry initializes the device and puts it into
the power-down state. An external reset must be applied to the active low RESET pin to guarantee reset upon
power on. After the initial power-on sequence the TWL1101 can be functionally powered up and down by writing
to the Power Control register through the I2C interface.
reference
A precision band gap reference voltage is generated internally and supplies all required references to operate
the transmit and receive channels. The reference system also supplies bias current for use with an electret
microphone at pin MBIAS. An external precision resistor is required for reference current setting at pin REXT.
A separate reference system ground is also provided at pin REFVSS .
low noise filter
The VBAP requires external decoupling capacitors at pins DECBG and DECOD.
I2C serial interface
The I2C bus is a simple two-wire bidirectional serial interface. It controls the VBAP by writing data to the following
five control registers: 1) power control, 2) mode control, 3) transmit PGA and sidetone control, 4) receive volume
control, 5) receive PGA gain control.
phase-locked loop
The internal digital filters and modulators require a 10.24-MHz clock that is generated by phase locking to the
2.048-MHz master clock input.
PCM interface
The PCM interface transmits and receives data at the PCMO and PCMI pins respectively. The data is
transmitted or received at the PCMCLK speed once every PCMSYN cycle. The PCMCLK may be tied directly
to the 2.048-MHz master clock (MCLK).
microphone amplifiers
The microphone input is a switchable interface for two differential microphone inputs. The first stage is a low
noise differential amplifier that provides a selectable gain of –2.62 dB or 5.38 dB, which is routed to output pins
MICOUTP and MICOUTN. The second stage amplifier gain is set externally. The first and second stages may
be tied directly together with a specified gain or an external filter may be added to enhance the transmit channel
performance.
analog modulator
The transmit channel modulator is a third-order sigma-delta design.
transmit filter and PGA
The transmit filter is a digital filter designed to meet CCITT G.714 requirements. The device operates in either
the 13-bit linear or 8-bit companded
-law mode that is selectable through the I2C interface. The transmit PGA
defaults to 0 dB.
sidetone
A portion of the transmitted audio is attenuated and fed back to the receive channel through the sidetone path.
The sidetone path defaults to –12 dB. The sidetone path can be muted by writing to the Power Control register.
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| TWL1103PBSR | SPECIALTY CONSUMER CIRCUIT, PQFP32 |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TWL1102PBS | 功能描述:IC VOICE BAND AUDIO PROC 32-TQFP RoHS:是 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:VBAP™ 其它有關(guān)文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應(yīng)用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| TWL1103 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:VOICE-BAND AUDIO PROCESSOR VBAPE |
| TWL1103GQE | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
| TWL1103GQER | 功能描述:VOICE BAND AUDIO PROC 80-BGA RoHS:否 類別:集成電路 (IC) >> 線性 - 音頻處理 系列:VBAP™ 其它有關(guān)文件:STA321 View All Specifications 標準包裝:1 系列:Sound Terminal™ 類型:音頻處理器 應(yīng)用:數(shù)字音頻 安裝類型:表面貼裝 封裝/外殼:64-LQFP 裸露焊盤 供應(yīng)商設(shè)備封裝:64-LQFP EP（10x10） 包裝:Digi-Reel® 其它名稱:497-11050-6 |
| TWL1103PBS | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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