MX614TN Просмотр технического описания (PDF) - MX-COM Inc

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MX614TN

Bell 202 Compatible Modem

MX-COM Inc  

Bell 202 Compatible Modem

5

3. External Components

MX614 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

MX614

12

CLK

11 TXD

10 RXEQ

9 VBIAS

C4

R1

C1 C2

C3

C4

X1

Note 1

100kΩ

18pF

0.1µF

0.1µF

3.579545MHz

±5%

±10%

±10%

±10%

Figure 2: Recommended External Components for Typical Application

External Components Notes

1. IMPORTANT: This device is capable of detecting and decoding small amplitude signals. To achieve

this VDD and VBIAS decoupling and protecting the receive path from extraneous in-band signals are very

important. It is recommended that the decoupling capacitors be placed so that connections between

them and the device pins are as short as practicable e.g. ≤ 1 inch from device pins. A ground plane

protecting the receive path will help attenuate interfering signals

2. 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.

2000 MX-COM, INC.

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

Doc. # 20480162.004

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

All Trademarks and Service Marks are held by their respective companies.

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