Audio Signaling Processor
Page 6 of 26
MX803A PRELIMINARY INFORMATION
3. External Components
Figure 2: Recommended External Components
R1
R2
R3
R4
R5
R6
R7
R8
Note 2, 3
Note 2, 3
Note 2, 3
Note 2
Note 2, 5
1.0MΩ
2.0MΩ
100kΩ
82.0kΩ
122kΩ
100kΩ
100kΩ
22.0kΩ
Table 2: Recommended External Components
Notes:
1. Xtal/clock components described are recommended in accordance with MX-COM's Application Note on
Standard and DBS 800 Crystal Oscillator Circuits (April 1990). For best results, a crystal oscillator design
should drive the clock inverter input with signal levels of at least 40% of V
DD
, peak to peak. Tuning fork
crystals generally cannot meet this requirement. To obtain crystal oscillator design assistance, consult
your crystal manufacturer.
2. System Components whose values are calculated to allow the MX803A to operate with other DBS 800
microcircuits. Figure 3 shows these components used in the system signal paths.
3. R3, R4, R5 and C5 are tone mixing components calculated to provide a 3dB tone differential (twist) for
use in a DTMF configuration. Single tone output levels are set independently.
4. When X1 > 5.00MHz, C3 = C4 = 18pF
5. R7 provides modulation level and matching outputs for the MX803A.
±10%
±10%
±10%
±10%
±10%
±10%
±10%
C1
C2
C3
C4
C5
C6
X1
Note 1, 4
Note 4
Note 4
Note 3
0.1µF
1.0µF
33.0pF
33.0pF
22.0pF
1.0µF
4.00MHz
±20%
±20%
±20%
±20%
±20%
±20%
©2001 MX•COM, INC.
www.mxcom.com
Tele: 800 638 5577 336 744 5050
Fax: 336 744 5054
Doc. # 20480122.005
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All trademarks and service marks are held by their respective companies.
CMLMICRO [ CML MICROCIRCUITS ]
