參數(shù)資料
型號(hào)： TEA1093T
廠商： NXP SEMICONDUCTORS
元件分類(lèi)： 通信及網(wǎng)絡(luò)
英文描述： Hands-free IC
中文描述： SPECIALTY TELECOM CIRCUIT, PDSO28
封裝： 7.50 MM, PLASTIC, SOT-136-1, MS-013AE, SO-28
文件頁(yè)數(shù)： 10/28頁(yè)
文件大?。?/td> 208K
代理商： TEA1093T
1996 Feb 09
10
Philips Semiconductors
Product specification
Hands-free IC
TEA1093
When the supply conditions drop below the required level,
the gain of the loudspeaker amplifier is reduced in order to
prevent the TEA1093 from malfunctioning. Only the gain of
the loudspeaker amplifier is affected since it is considered
to be the major power consuming part of the TEA1093.
When the TEA1093 experiences a loss of current, the
supply voltage V
BB
decreases. In this event, the gain of the
loudspeaker amplifiers is slowly reduced (approximately a
few seconds). When the supply voltage continues to
decrease and drops below an internal voltage threshold of
2.75 V, the gain of the loudspeaker amplifier is rapidly
reduced (approximately 1 ms). When normal supply
conditions are resumed, the gain of the loudspeaker
amplifier is increased again. This system ensures that in
the event of large continuous signals, all current is used to
power the loudspeaker while the voltage on pin V
BB
remains at its nominal value.
By forcing a level lower than 0.2 V on pin DLC/MUTER, the
loudspeaker amplifier is muted and the TEA1093 is
automatically forced into the transmit mode.
Duplex controller
S
IGNAL AND NOISE ENVELOPE DETECTORS
:
PINS
TSEN,
TENV, TNOI, RSEN, RENV
AND
RNOI
The signal envelopes are used to monitor the signal level
strength in both channels. The noise envelopes are used to
monitor background noise in both channels. The signal and
noise envelopes provide inputs for the decision logic. The
signal and noise envelope detectors are shown in Fig.8.
For the transmit channel, the input signal at MIC is 40 dB,
amplified to TSEN. For the receive channel, the differential
signal between RIN1 and RIN2 is 0 dB amplified to RSEN.
The signals from TSEN and RSEN are logarithmically
compressed and buffered to TENV and RENV
respectively. The sensitivity of the envelope detectors is
set with R
TSEN
and R
RSEN
. The capacitors connected in
series with the two resistors block any DC component and
form a first-order high-pass filter. In the basic application,
see Fig.16, it is assumed that V
MIC
= 1 mV (RMS) and
V
RIN
= 100 mV (RMS) nominal and both R
TSEN
and R
RSEN
have a value of 10 k
. With the value of C
TSEN
and C
RSEN
at 100 nF, the cut-off frequency is at 160 Hz.
The buffer amplifiers leading the compressed signals to
TENV and RENV have a maximum source current of
120
μ
A and a maximum sink current of 1
μ
A. Together with
the capacitor C
TENV
and C
RENV
, the timing of the signal
envelope monitors can be set. In the basic application, the
value of both capacitors is 470 nF. Because of the
logarithmic compression, each 6 dB signal increase
means 18 mV increase of the voltage on the envelopes
TENV or RENV at room temperature. Thus, timings can be
expressed in dB/ms. At room temperature, the 120
μ
A
sourced current corresponds to a maximum rise-slope of
the signal envelope of 85 dB/ms. This is sufficient to track
normal speech signals. The 1
μ
A current sunk by TENV
or RENV corresponds to a maximum fall-slope of
0.7 dB/ms. This is sufficient for a smooth envelope and
also eliminates the effect of echoes on switching
behaviour.
Fig.8 Signal and noise envelope detectors.
handbook, full pagewidth
MGD223
LOG
28
(24)
27
(23)
26
(22)
25
(21)
24
(20)
23
(19)
LOG
from
microphone
amplifier
from
loudspeaker
amplifier
TSEN
RTSEN
CTSEN
CTENV
CTNOI
RRSEN
CRSEN
CRENV
CRNOI
TENV
TNOI
RSEN
RENV
RNOI
to logic
to logic
相關(guān)PDF資料
PDF描述
TEA1094 Hands free IC
TEA1094A Hands free IC
TEA1094AM Hands free IC
TEA1094AT Hands free IC
TEA1094T Hands free IC
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TEA1094 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hands free IC
TEA1094A 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hands free IC
TEA1094AM 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hands free IC
TEA1094AT 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hands free IC
TEA1094T 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Hands free IC
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