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TEA1094AT View Datasheet(PDF) - Philips Electronics

Part NameDescriptionManufacturer
TEA1094AT Hands free IC Philips
Philips Electronics Philips
TEA1094AT Datasheet PDF : 28 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Philips Semiconductors
Hands free IC
Product specification
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.
handbook, full pagewidth
DUPLEX CONTROLLER
from
microphone
amplifier
LOG
to logic
from
loudspeaker
amplifier
LOG
to logic
TSEN
28
(24)
TENV
27
(23)
RTSEN
TNOI
26
(22)
CTSEN
CTENV
CTNOI
RSEN
25
(21)
RENV
24
(20)
RRSEN
RNOI
23
(19)
CRSEN
CRENV
CRNOI
The pin numbers given in parenthesis refer to the TEA1094A.
Fig.7 Signal and noise envelope detectors.
MGD223
handbook, full pagewidth
INPUT SIGNAL
4 mV (RMS)
1 mV (RMS)
MBG354
SIGNAL ENVELOPE
A
36 mV
B
A: 85 dB/ms
B: 0.7 dB/ms
A
B
NOISE ENVELOPE
C
B: 0.7 dB/ms
C: 0.07 dB/ms
36 mV
B
C
B
time
Fig.8 Signal and noise envelope waveforms.
1996 Jul 15
10
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