參數(shù)資料
型號(hào)： 935263379112
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 無(wú)繩電話/電話
英文描述： TELEPHONE SPEECH CKT, PDIP16
封裝： 0.300 INCH, PLASTIC, SOT-38-4, DIP-16
文件頁(yè)數(shù)： 22/30頁(yè)
文件大?。?/td> 218K
代理商： 935263379112
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TEA1114A
Information as of 2000-08-20
TEA1114A; Low voltage telephone transmission circuit with dialler interface and regulated strong supply
The TEA1114A is a bipolar integrated circuit that performs all speech and line interface functions required in fully electronic telephone sets.
It performs electronic switching between speech and dialling. The IC operates at a line voltage down to 1.45 V DC (with reduced
performance) to facilitate the use of telephone sets connected in parallel.
When the line current is high enough, a fixed amount of current is derived from the LN pin in order to create a strong supply point at pin
V
DD. The voltage at pin VDD is regulated to 3.3 V to supply peripherals such as dialler, LCD module and microcontroller.
l
Low DC line voltage; operates down to 1.45 V (excluding voltage drop over external polarity guard)
l
Line voltage regulator with adjustable DC voltage
l
3.3 V regulated strong supply point for peripheral circuits compatible with:
- Speech mode
- Ringer mode
- Trickle mode.
l
Transmit stage with:
- Microphone amplifier with symmetrical high impedance inputs
- DTMF amplifier with confidence tone on receive output.
l
Receive stage with:
- Receive amplifier with asymmetrical output
- Earpiece amplifier with adjustable gain (and gain boost facility) for all types of earpieces.
l
MUTE input for pulse or DTMF dialling
l
AGC line loss compensation for microphone and receive amplifiers.
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