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參數(shù)資料
| 型號： | TWL1110PBSR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 消費家電 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP32 |
| 封裝： | PLASTIC, QFP-32 |
| 文件頁數(shù)： | 33/40頁 |
| 文件大?。?/td> | 564K |
| 代理商： | TWL1110PBSR |
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Product Folder: TWL1110, 15-Bit Linear, 8-Bit u/A-Law, 2.048 MHz Master Clock, 2048/128 kHz PCM Clock Support, Sidetone
and filters. It is a low-power device with companding options and programming features, and it meets the requirements for
communication systems, including the cellular phone. The device operates in either the 15-bit linear or 8-bit companded (u-
law or A-Law) mode, which is selectable through the I2C interface.
A coder, an analog-to-digital converter or ADC, digitizes the analog voice signal, and a decoder, an digital-to-analog
converter or DAC, analogs the digital-voice signal. VBAP provides a companding option to overcome the bandwidth
limitations of telephone networks without degradation in sound quality. The human auditory system is a logarithmic system
in which high amplitude signals require less resolution than low amplitude signals. Therefore, an 8-bit code word with
nonuniform quantization (u-law or A-law) has the same quality as 13-bit linear coding. VBAP provides better digital code
words by generating a 15-bit linear coding option.
This device contains circuits to protect its inputs and outputs against damage due to high static voltages or electrostatic
fields. These circuits have been qualified to protect this device against electrostatic discharges (ESD) of up to 2 kV according
to MIL-STD-883C, Method 3015; however, it is advised that precautions be taken to avoid application of any voltage higher
than maximum-rated voltages to these high-impedance circuits. During storage or handling, the device leads should be
shorted together or the device should be placed in conductive foam. In a circuit, unused inputs should always be connected
to an appropriated logic voltage level, preferably either VCC or ground. Specific guidelines for handling devices of this type
are contained in the publication Guidelines for Handling Electrostatic-Discharge-Sensitive (ESDS) Devices and Assemblies
available from Texas Instruments.
The human voice is effective from a frequency range of 300 Hz to 3300 Hz in telephony applications. In order to eliminate
unwanted signals, the VBAP design has two types of filters that operate in both the transmit and receive path. A low-pass
filter attenuates the signals over 4 kHz. A selectable high-pass filter cleans up the signals under 100 Hz. This reduces noise
that may have coupled in from 50/60-Hz power cables. The high-pass filter is bypassed by selecting the corresponding
register bit.
VBAP has many programming features that are controlled using a 2-wire standard serial I2C interface. This allows the device
to interface with many digital ICs such as a DSP or a microprocessor. The device has seven registers: power control, mode
control, transmit PGA, receive PGA, high DTMF, low DTMF, and auxiliary mode control. Some of the programmable features
that can be controlled by I2C interface include:
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Transmit amplifier gain
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Receive amplifier gain
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Sidetone gain
q
Volume control
q
Earphone control
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PLL power control
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Microphone selection
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Transmit channel high-pass filter control
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Receive channel high-pass filter control
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Companding options and selection control
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PCM loopback
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DTMF control
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Pulse density modulated control
The VBAP is also capable of generating its own internal clocks from a 2.048-MHz master clock input.
TECHNICAL RESOURCES
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DATASHEET
APPLICATION NOTES
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Amplifiers and Bits: An Introduction to Selecting Amplifiers for Data Converters (Rev. B) (SLOA035B - Updated:
12/18/2001
)
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file:///G|/imaging/BITTING/cpl_rework/twl1110.html (2 of 3) [May-09-2002 3:33:53 PM]
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| TWL1110TQFP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:VOICE-BAND AUDIO PROCESSOR VBAPE |
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| TWL1200IPFBRQ1 | 功能描述:轉(zhuǎn)換 - 電壓電平 SDIO,UART,and Audio Vltg-Level Xcvr RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MLF-8 |
| TWL1200-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SDIO, UART, AND AUDIO VOLTAGE-TRANSLATION TRANSCEIVER |
| TWL1200YFFR | 功能描述:轉(zhuǎn)換 - 電壓電平 SDIO UART & Aud Vltg Level Transceiver RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:MLF-8 |
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