SPM and Security Subsystem

FX651

© 1997 Consumer Microcircuits Limited

6

D/651/4

1.4

External Components

Component

3.3V

5.0V

C1, C2

33pF ±10%

68pF ±10%

R1, R3

1.1M

Ω ±1%

1.0M

Ω ±1%

R2, R4

270k

Ω ±1%

330k

Ω ±1%

C3, C4

0.1µF ±20%

R5

51k

Ω ±1%

C5

100pF ±10%

Notes

1.

gain must compensate for this and also prevent the input circuitry saturating. It is recommended

that the amplifier components (R1 to R4, C1 and C2) are used to set the gain between -10dB (if

Figure 2 Recommended External Components (D4)