MX604P 查看數據表（PDF） - MX-COM Inc

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MX604P

v.23 Compatible Modem

MX-COM Inc  

v.23 Compatible Modem

5

3. External Components

MX604 PRELIMINARY INFORMATION

C1

X1 XTAL 1

C2

XTAL/CLOCK 2

VDD

16 VDD

15 RDY

R1 C3

From µC

M0 3

M1 4

RXIN 5

RXAMPOUT

6

TXOUT

7

VSS 8

14 DET

13 RXD

MX604

12

CLK

11 TXD

10 RXEQ

9 VBIAS

C4

R1

C1, C2

C3

C4

X1

Note 1

100k

18pF

0.1F

0.1F

3.579545MHz

5%,

10%

10%

10%

Figure 2: Recommended External Components for Typical Application

External Components Notes:

1. A crystal frequency of 3.579545MHz 0.1% is required for correct FSK operation. For best results, a

crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of VDD,

peak-peak. Tuning fork crystals generally cannot meet this requirement. To obtain crystal oscillator

design assistance, consult your crystal manufacturer. Operation of this device without a Xtal or Clock

input may cause device damage.

4. General Description

4.1 Xtal Osc and Clock Dividers

Frequency and timing accuracy of the MX604 is determined by a 3.579545MHz clock present at the

XTAL/CLOCK pin. This may be generated by the on-chip oscillator inverter using the external components

C1, C2 and X1 of Figure 2, or it may be supplied from an external source to the XTAL/CLOCK input. If

supplied from an external source, C1, C2 and X1 should not be used.

The on-chip oscillator is disabled in the 'Zero-Power' mode.

If the clock is provided by an external source which is not always running, then the 'Zero-Power' mode must

be set when the clock is not available. Failure to observe this rule may cause a significant rise in the supply

current drawn by MX604 as well as generating undefined states of the RXD, DET and RDY outputs.

1998 MXCOM, INC.

Tele: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480152.004

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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