MX919BLH データシートの表示（PDF） - MX-COM Inc
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MX919BLH Datasheet PDF : 48 Pages
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4-Level FSK Modem Data Pump
3. External Components
Page 8 of 47
MX919B PRELIMINARY INFORMATION
VDD
C1 C8
IRQ
D7
1
2
24 VDD
23 RXAMPOUT
R2
From Rx FM
R1
Discriminator
D6
3
22 RXIN
D5
D4
D3
4
21 VBIAS
5
6
MX919B 20
19
TXOUT
DOC1
To Tx Frequency
R4
Modulator
D2
7
18 DOC2
D1
8
17 XTAL/CLOCK
D0
9
16 XTAL
C7 C6 C5 C2
RD
10
15 A1
WR
CS
VSS
11
12
A0
14 A0
13 CS
XTAL/CLOCK
17
X1 C3
A1
R3 C4
16
XTAL
Figure 2: Recommended External Components
Component
R1
R2
R3
R4
C1
C2
C3
Notes Value Tolerance
Component Notes
3
±20%
C4
3
100kΩ
±5%
C5
4
1MΩ
±20%
C6
5
100kΩ
±5%
C7
5
0.1µF
±20%
C8
4
0.1µF
±20%
3
±20%
X1
2,3
Table 2: Recommended External Components
Value
Tolerance
±20%
±5%
±20%
±20%
±5%
Recommended External Component Notes:
1. See Section 4.1.10.
2. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at
lceraysstta4l 0o%scoillfaVtoDrDd, epseigank
to peak. Tuning fork crystals generally cannot
assistance, consult your crystal manufacturer.
meet
this
requirement.
To obtain
3. The values used for C3 and C4 should be suitable for the frequency of the crystal X1. As a guide, values
(including stray capacitance) of 33pF at 1MHz falling to 18pF at 10MHz will generally prove suitable.
Crystal frequency tolerances are discussed in Section 4.5.3.4.
4. Values C5 and C8 should be equal to 750,000 / symbol rate, e.g.
5. Values C6 and C7 should be equal to 50,000 / symbol rate, e.g.
Symbol Rate
2400 symbols/second
4800 symbols/second
9600 symbols/second
C5 and C8
330pF
150pF
82pF
Symbol Rate
2400 symbols/second
4800 symbols/second
9600 symbols/second
C6 and C7
0.022µF
0.01µF
4700pF
©2001 MX•COM, INC.
www.mxcom.com Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054
Doc. # 20480170.003
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by their respective companies.
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