MX465TN データシートの表示（PDF） - CML Microcircuits
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MX465TN Datasheet PDF : 17 Pages
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Low Voltage CTCSS Encoder/Decoder
6
3 External Components
MX465
VDD
C1
VDD 1
C2
XTAL/CLK
2
C3
X1 R1
XTAL
3
LOAD / LATCH 4
D5/SERIAL ENABLE 1
5
D4/SERIAL ENABLE 2
6
D3/SERIAL DATA IN
7
D2/SERIAL CLOCK
8
D1
9
D0
10
VSS 11
DECODE COMPARATOR REF. 12
MX465
TONE IN
C4
24
RX AUDIO IN
C5
23
TX AUDIO IN
C10
22
21
VBIAS
C6
TX AUDIO OUT
C11
20
RX AUDIO OUT
C7
19
PTL
18
RX / TX
17
TONE OUT
C8
16
RX TONE DETECT
R2
15
DECODE COMPARATOR IN R3 D1
14
RX TONE DECODE
C9
13
Figure 2 : Recommended External Components for Typical Application
R1 Note 1 1.0M 10%
R2
560k 10%
R3
820k 10%
C1
0.1F 20%
C2 Note 1 18pF 20%
C3 Note 1 33pF 20%
C4 Note 2 0.1F 20%
C5 Note 2 0.1F 20%
C6
0.47F
20%
C7 Note 2 0.1F
20%
C8 Note 2 0.1F
20%
C9 Note 2 0.1F
20%
C10 Note 2 0.1F
20%
C11 Note 2 0.1F
20%
D1
small signal
X1 Note 1 4MHz 100ppm max.
Table 2: External Components
External Components Notes:
1. The values specified for R1, C2, and C3 have been found to be satisfactory when used with a crystal
(X1) whose equivalent series resistance is 1000. For best results, a crystal oscillator design should
drive the clock inverter input with signal levels of at least 40% of VDD, peak to peak. Tuning fork
crystals generally cannot meet this requirement. To obtain crystal oscillator design assistance, consult
your crystal manufacturer.
2. The 0.1F value for the DC Blocking capacitors, C4, C5, C7, C8, C9, C10, and C11 is not a
requirement. For the capacitors C4, C5, and C10, the input impedance is internal to the device and
specified typical as 550k. For the remaining capacitors external circuits will be important in
determining the input impedance.
©1998 MX•COM, INC.
www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. #20480143.008
4800 Bethania Station Road, winston-Salem, NC 27105-1201 USA
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