TEA1093T Philips Semiconductors, TEA1093T Datasheet - Page 8

• Manufacturer Part Number: TEA1093T
• Description: Hands-free IC
• Manufacturer: Philips Semiconductors

Philips Semiconductors
1996 Feb 09
handbook, halfpage
Hands-free IC
V BB
(V)
handbook, full pagewidth
10
8
6
4
2
1
3.6 V without RVA
Fig.5 V
V BB
BB
10
R MIC
as a function of R
C MIC
RVA(VA-GND)
19
22
10
MUTET
MIC
envelope
detector
2
RVA(VA-VBB)
R VA (k )
to
VA
MGD220
.
V
switch
voice
Fig.6 Microphone channel.
from
10
I
3
logic
to
8
Microphone channel: pin MIC, GAT, MOUT, MICGND
and MUTET
The TEA1093 has an asymmetrical microphone input MIC
with an input resistance of 20 k . 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 A (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 R
15 dB typical with R
A capacitor must be connected in parallel with R
ensure stability of the microphone amplifier. Together with
R
By applying a HIGH level on pin MUTET, the microphone
amplifier is muted and the TEA1093 is automatically
forced into the receive mode.
GAT
, it also provides a first-order low-pass filter.
I
V
MICGND
MOUT
MGD221
GAT 21
GAT
20
18
= 30.1 k .
R GAT
Product specification
to TEA106X
GAT
TEA1093
and equals
GAT
to