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AMPS/NAMPS System Audio Processor.
MX826 Preliminary Information
© 1997 MX
•COM Inc.
www.mxcom.com
Tele: 800 638-5577
910 744-5050
Fax: 910 744-5054
Doc. # 20480070.004
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
Application Information
Notes
1.
Xtal/clock operation
Operation of any MX-COM IC without a Xtal or
clock input may cause device damage. To minimize
damage in the event of a Xtal/drive failure, you
should install a current limiting device (resistor or
fast-reaction fuse) on the power input (V
DD).
Figure 2 - Recommended External Components
Tolerances –
Capacitors ±20%
C
3
=
100nF
C
4
100nF
C
5
100nF
C
6
100nF
C
7
100nF
C
13
=
100nF
C
14
100nF
C
15
100pF
C
16
100nF
X
1
4.000MHz
R
1
=
100k
Ω
R
2
as required
R
3
100k
Ω
R
4
as required
C
1
100nF
C
2
100nF
C
8
=
100nF
C
9
33pF
C
10
100nF
C
11
33pF
C
12
1.0
µF
2.
SAT Output
It is possible, due to the impedance of this output,
that an external buffer amplifier will be required
when interfacing or mixing with other cellular system
sections.
3.
TX Mix Gain
The value of R
4 should be chosen with R3/C15 in
order to provide the required gain.
XTAL/CLOCK
SERIAL CLOCK
COMMAND DATA
VBIAS
RX AUDIO IN
EXPAND/STORE
(EXPANDED) AUDIO IN
TX MOD OUT
LS AUDIO OUT
EAR AUDIO OUT
SIDETONE OUT
VSS
SAT OUT
TX MIX IN
TX FILTER OUT
DEV LIM IN
PRE-EMP OUT
DTMF IN
(COMPRESSED) AUDIO IN
COMPRESS
MIC.2 IN
MIC.1 IN
PLAY IN
VDD
CHIP SELECT
VDD
XTAL
C11
C 9
X 1
C 4
C 8
C
12
C 7
C 6
C 5
C 1
C 3
C
10
MX826J
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
TX MIX
C
13
C 2
Signaling and
Wideband Data
C
14
C
15
C
16
R
1
R
3
R
4
R
2
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