Low Voltage SPM Detector

CMX631A

© 1998 Consumer Microcircuits Limited

5

D/631A/1

3

External Components

Figure 2: Recommended External Components

R1

Note 1

C1

1.0µF

±20%

R2

Note 1

C2

1.0µF

±20%

R3

Note 1

C3

R4

Note 1

C4

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

crystal oscillator design assistance, consult your crystal manufacturer.

3.

The on-chip crystal circuitry includes a feedback resistor (nominally 2M

Ω) between pins 1 and 2 and

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

4.

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