參數(shù)資料
型號(hào): TWL1110TQFP
廠商: Texas Instruments, Inc.
英文描述: VOICE-BAND AUDIO PROCESSOR VBAPE
中文描述: 語音頻帶音頻處理器VBAPE
文件頁數(shù): 2/37頁
文件大?。?/td> 496K
代理商: TWL1110TQFP
TWL1110
VOICE-BAND AUDIO PROCESSOR (VBAP
)
SLWS103 – NOVEMBER 2000
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description (continued)
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 I
2
C 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 I
2
C interface include:
Transmit amplifier gain
Receive amplifier gain
Sidetone gain
Volume control
Earphone control
PLL power control
Microphone selection
Transmit channel high-pass filter control
Receive channel high-pass filter control
Companding options and selection control
PCM loopback
DTMF control
Pulse density modulated control
The VBAP is also capable of generating its own internal clocks from a 2.048-MHz master clock input.
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