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參數(shù)資料
| 型號： | TWL1101PFB |
| 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)： | 9/31頁 |
| 文件大小： | 408K |
| 代理商： | TWL1101PFB |
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TWL1101
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS074A – MAY 1998 REVISED MARCH 1999
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
power-on initialization
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 with a minimum pulse width of 500 ns must be applied to the active low
RESET pin to guarantee reset upon power on. Bit 0 of the power control register defaults to logic 0 upon reset
(codec, reference system, and phase-locked loop (PLL) in power-down state). Gain control registers for the
programmable gain amplifiers are initialized as indicated in the corresponding registers. The TWL1101 can be
powered up by writing a logic 1 to bit 0 of the power control register through the I2C interface. The earphone
and microphone amplifiers can be selected during the same I2C write sequence.
The desired selection for all programmable functions can be initialized prior to a power-up command using the
I2C-bus interface.
Table 1. Power-Up and Power-Down Procedures (VDD = 3 V, Earphone Amplifier Unloaded)
DEVICE STATUS
PROCEDURE
MAXIMUM POWER
CONSUMPTION
Power-up
Set bit zero = 1 in power control register, EAR1 enabled
33 mW
Power-up
Set bit zero = 1 in power control register, EAR2 enabled
27 mW
Power-down
Set bit zero = 0 in power control register
90
W
In addition to resetting the power-down bit in the power control register, loss of MCLK (no transition detected)
automatically enters the device into power-down state with PCMO in the high impedance state. If during a pulse
code modulation (PCM) data transmit cycle an asynchronous power down occurs, the PCM interface remains
powered up until the PCM data is completely transferred.
conversion laws
The device can be programmed either for 13-bit linear or 8-bit
-law companding mode. The -law companding
operation approximates the CCITT G.711 recommendation. The linear mode operation uses a 13-bit twos
complement format.
transmit operation
microphone input
The microphone input stage is a low noise differential amplifier that provides a selectable preamplifier gain of
5.38 dB or –2.62 dB. A microphone can be capacitively connected to the MIC1N and MIC1P inputs, while the
MIC2N and MIC2P inputs can be used to capacitively connect a second microphone or an auxiliary audio circuit.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TWL1101PFBR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| 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 |
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