CMX631A 查看數據表（PDF） - CML Microcircuits

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CMX631A

Low Voltage SPM Detector

CML Microcircuits 

Low Voltage SPM Detector

CMX631A

4.3.2 Input Gain Components

Refer to the gain components found in Table 2 and Figure 2. The user should calculate and select external

components (R1/R2/C3 and R3/R4/C4) to provide amplifier gain within the limits obtained in 4.3.1 Input Gain

Calculation.

Component tolerances should not move the gain-figure outside these limits. The graphs Figure 4 and Figure 5 are

for the calculation of input gain components for a CMX631A using a VDD of 3.0 (±0.1) or VDD of 5.0 (±0.5).

4.4 ‘WILL’/’WILL-NOT’ Detect Frequencies

Figure 6: ‘WILL’/’WILL-NOT’ Detect Frequencies

5 Applications

5.1 Input Configurations

Figure 7: Input Configurations

5.1.1 Protection Against High Voltages

Telephone systems may have high DC and AC voltages present on the line. If the CMX631A is a part of host

equipment that has its own signal input protection circuitry, there will be no need for further protection as long as the

voltage on any pin is limited to within VDD +0.3V and VSS -0.3V.

If the host system does not have input protection, or there are signals present outside the device's specified limits,

the CMX631A will require protection diodes at its signal inputs (+ and -). The breakdown voltage of the capacitors

and the peak inverse voltage of the diodes must be sufficient to withstand the sum of the DC voltages plus all

expected signal peaks.

© 1998 Consumer Microcircuits Limited

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D/631A/1

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