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TEA1093 Fiches technique(PDF) 8 Page - NXP Semiconductors

No de pièce TEA1093
Description  Hands-free IC
Download  28 Pages
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Fabricant  PHILIPS [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1093 Fiches technique(HTML) 8 Page - NXP Semiconductors

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1996 Feb 09
8
Philips Semiconductors
Product specification
Hands-free IC
TEA1093
Fig.5 VBB as a function of RVA.
handbook, halfpage
10
2
6
8
MGD220
4
VBB
(V)
RVA (kΩ)
110
102
103
3.6 V without RVA
RVA(VA-GND)
RVA(VA-VBB)
Microphone channel: pin MIC, GAT, MOUT, MICGND
and MUTET
The TEA1093 has an asymmetrical microphone input MIC
with an input resistance of 20 k
Ω. The gain of the input
stage varies according to the mode of the TEA1093. In the
transmit mode, the gain is at its maximum; in the receive
mode, it is at its minimum and in the idle mode, it is halfway
between maximum and minimum. Switch-over from one
mode to the other is smooth and click-free. The output
capability at pin MOUT is 20
µA (RMS).
In the transmit mode, the overall gain of the microphone
amplifier (from pin MIC to MOUT) can be adjusted from
5 dB up to 25 dB to suit specific application requirements.
The gain is proportional to the value of RGAT and equals
15 dB typical with RGAT = 30.1 kΩ.
A capacitor must be connected in parallel with RGAT to
ensure stability of the microphone amplifier. Together with
RGAT, it also provides a first-order low-pass filter.
By applying a HIGH level on pin MUTET, the microphone
amplifier is muted and the TEA1093 is automatically
forced into the receive mode.
Fig.6 Microphone channel.
handbook, full pagewidth
MGD221
V
I
I
V
CMIC
VBB
RMIC
MUTET
MIC
from
voice
switch
to
envelope
detector
MICGND
MOUT
GAT 21
20
19
22
18
to TEA106X
RGAT
to
logic


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