CMX631A Просмотр технического описания (PDF) - CML Microcircuits

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CMX631A

Low Voltage SPM Detector

CML Microcircuits 

Low Voltage SPM Detector

3 External Components

CMX631A

Figure 2: Recommended External Components

R1 Note 1

R2 Note 1

R3 Note 1

R4 Note 1

RFEEDBACK

RIN(-)

RIN(+)

RBIAS

C1

1.0µF

C2

1.0µF

C3

CIN(-)

C4

CIN(+)

X1 Note 2, 3, 4 3.579545MHz

Table 2: Recommended External Components

±20%

±20%

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.

© 1998 Consumer Microcircuits Limited

5

D/631A/1

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