CMX969P4 查看數據表（PDF） - MX-COM Inc

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CMX969P4

MOTIENT/ARDIS RD-LAP MDC4800 Modem

MX-COM Inc  

MOTIENTSM/ARDISSM RD-LAPTM MDC4800 Modem

6

3 External Components

CMX969 Advance Information

VDD

C1

C6

IRQ

D7

1

2

VDD

24

R2

23 RXFB

FROM Rx FM

R1 DISCRIMINATOR

D6

3

22 RXIN

D5

4

21 VBI AS

D4

5

20 TXOUT

R4

D3

6 CMX969 19

TO Tx

FREQUENCY

D2

7 P4/E2/D5 18

D1

8

17 XTAL

MODULATOR

D0

9

RD

10

WR

11

CS

VSS 12

A0

16 XTAL

15 A1

14 A0

13 CS

C5 C2

VSS

17 XTAL

X1 C3

A1

R3 C4

16

XTAL

Figure 2: Recommended External Components

R1 See Section 4.1

C2 0.1 µF ± 20%

R2 100kΩ ± 5%

C3 ± 20%, see Note 1

R3 1MΩ ± 20%

C4 ± 20%, see Note 1

R4 100kΩ ± 5%

C5 100pF ± 5%

C1 0.1 µF ± 20%

C6 100pF ± 5%

X1 4.9152, 7.3728 or 9.8304 MHz ±100ppm. See Section 4.5.2

Table 2: Recommended External Components

Recommended External Component Notes:

1. The values used for C3 and C4 should be suitable for the frequency of the crystal X1. As a guide, values

(including stray capacitances) of 33pF at 1MHz falling to 18pF at 10MHz will generally prove suitable.

2. 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, please consult your crystal manufacturer.

¤2001 MX-COM, Inc.

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480211.002

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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