CMX631A データシートの表示（PDF） - MX-COM Inc

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CMX631A

Low Voltage SPM Detector

MX-COM Inc  

Low Voltage SPM Detector

5

3 External Components

CMX631A PRELIMINARY INFORMATION

XTAL/CLOCK 1

X1

XTAL 2

16 VDD

15 SYSTEM

VDD

C1

CLOCK OUT 3

14 PACKET MODE OUTPUT

CLOCK IN 4

13 TONE FOLLOWER OUTPUT

CMX631A

5 D4/P3 12

6

11 AMP OUT

R1

VBIAS 7

10 SIGNAL IN (-)

R2

C3

VSS 8

9 SIGNAL IN (+)

R3

C4

R4

C2

Figure 2: Recommended External Components

R1 Note 1 RFEEDBACK

R2 Note 1

RIN(-)

R3 Note 1

RIN(+)

R4 Note 1

RBIAS

C1

1.0µF

±20%

C2

1.0µF

±20%

C3

CIN(-)

C4

CIN(+)

X1 Note 2, 3, 4 3.579545MHz

Table 2: Recommended External Components

Recommended External Component Notes:

1. When calculating input gain components, for correct operation R1 and R4 should always be ≥ 33kΩ.

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, consult your crystal manufacturer.

3. The on-chip crystal circuitry includes a feedback resistor (nominally 2MΩ) between pins 1 and 2 and

load capacitors on pins 1 and 2 (nominally 10pF each, excluding package and board parasitics).

4. When using an external clock input, X1 should be removed, Pin 1 (Xtal/Clock) should be tied to VDD,

the Clock In and Clock Out jumper should be removed, and the external clock signal applied to Clock

In.

© 1999 MX•COM Inc.

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

Doc. # 20480177.004

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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