FX651 Consumer Microcircuits Limited, FX651 Datasheet - Page 6

• Manufacturer Part Number: FX651
• Description: Spm And Security Subsystem
• Manufacturer: Consumer Microcircuits Limited

SPM and Security Subsystem
1.4
1997 Consumer Microcircuits Limited
External Components
Notes
1.
Component
C1, C2
R1, R3
R2, R4
C3, C4
The device's sensitivity is approximately proportional to its power supply (V
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
V
DD
R5
C5
is 5.0V) and -13dB (if V
Figure 2 Recommended External Components (D4)
DD
is 3.3V).
1.1M ±1%
33pF ±10%
270k ±1%
3.3V
6
100pF ±10%
0.1µF ±20%
51k ±1%
1.0M ±1%
330k ±1%
68pF ±10%
5.0V
DD
) voltage. The input
D/651/4
FX651