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TEA1094 датащи(PDF) 10 Page - NXP Semiconductors

номер детали TEA1094
подробное описание детали  Hands free IC
Download  28 Pages
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1094 датащи(HTML) 10 Page - NXP Semiconductors

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1996 Jul 15
10
Philips Semiconductors
Product specification
Hands free IC
TEA1094; TEA1094A
To determine the noise level, the signals on TENV and
RENV are buffered to TNOI and RNOI. These buffers have
a maximum source current of 1
µA and a maximum sink
current of 120
µA. Together with the capacitors CTNOI and
CRNOI, the timing can be set. In the basic application of
Fig.13 the value of both capacitors is 4.7
µF. At room
temperature, the 1
µA sourced current corresponds to a
maximum rise-slope of the noise envelope of
approximately 0.07 dB/ms.
This is small enough to track background noise and not to
be influenced by speech bursts. The 120
µA current that is
sunk corresponds to a maximum fall-slope of
approximately 8.5 dB/ms. However, during the decrease
of the signal envelope, the noise envelope tracks the
signal envelope so it will never fall faster than
approximately 0.7 dB/ms. The behaviour of the signal
envelope and noise envelope monitors is illustrated in
Fig.8.
Fig.7 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
DUPLEX CONTROLLER
TSEN
RTSEN
CTSEN
CTENV
CTNOI
RRSEN
CRSEN
CRENV
CRNOI
TENV
TNOI
RSEN
RENV
RNOI
to logic
to logic
The pin numbers given in parenthesis refer to the TEA1094A.
handbook, full pagewidth
MBG354
INPUT SIGNAL
SIGNAL ENVELOPE
NOISE ENVELOPE
4 mV (RMS)
1 mV (RMS)
A
C
C
36 mV
36 mV
B
B
B
A
B
time
A: 85 dB/ms
B: 0.7 dB/ms
B: 0.7 dB/ms
C: 0.07 dB/ms
Fig.8 Signal and noise envelope waveforms.


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