MT9094 Mitel Networks Corporation, MT9094 Datasheet - Page 20

• Manufacturer Part Number: MT9094
• Description: ISO2-CMOS ST-BUS FAMILY Digital Telephone (DPhone-II)
• Manufacturer: Mitel Networks Corporation

MT9094
Applications
To maintain a fully differential topology in the
transmit path the suggested connection scheme for
the transmit microphones is shown in Figure 7.
However, it is possible to use a single-ended
arrangement as shown in Figure 8 for the transmit
interface. In this case the dynamic range of the
MT9094 is reduced by half. In both figures the output
drivers are connected in a fully differential manner.
The MT9094 is a member of the Mitel family of digital
terminal equipment components. There are two
7-64
Transmission
Microport
MCS-51
ST-BUS
INTEL
Serial
Device
Port
to
+5V
DATA2
DATA1
SCLK
DSTo
Av = 1+
DSTi
WD
C4i
F0i
CS
10
11
12
13
14
15
16
17
7
8
9
2R
T
18 19 20 21 22 23 24 25 26 27 28
R
R
6
Figure 7 - Application Circuit - fully differential audio input
0.1 F
5
+
-
-
+
4
T
3
0.1 F
VBias
2
100K
100K
MT9094
VBias
1 44
0.1 F
0.1 F
+5V
43 42 41 40
LCD
330
511
511
Av = 1+
transmisssion devices which connect directly with
the MT9094 to complete an application; the MT8930
(SNIC) and the MT8971/72 (DSIC/DNIC). An ISDN
4-wire "TE" function is implemented with the
MT8930/MT9094 combination. A 2-wire digital phone
for
applications is implemented with the MT8971/72/
MT9094 combination.
Figures 9 and 10 show the 4-wire and 2-wire
applications, respectively.
+
2R
PABX,
T
+
Electret
Microphone
10 F
R
39
38
37
36
35
34
33
32
31
30
29
R
key-systems
LCD
+
-
+
-
.1 F 1000pF
75
+5V
Note: Single-ended configurations reduce
T
dynamic range by a factor of two.
75
100K
100K
VBias
and
0.1 F
0.1 F
1000pF
+5V
other
1000pF caps
are optional
+
330
511
511
Electret
Microphone
proprietary
150
40 nom.
32 min.
+
+
10 F
7