Tone Detector

9

MX105A PRELIMINARY INFORMATION

© 1997 MX•COM, INC.

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Doc.# 20480133.003

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5.9 Calculate Maximum De-response Time

T3

ln

V

V

R3

C3

OFF

TH

IN

A

MAX

≈− ×













×

For improved de-response time, a diode (1N914 or similar) can be placed between pins 5 and 6, as shown in Figure 3.

The formula and figure below show the approximate time the MX105A will take to turn off after an in-band signal has been

removed. The effect of this diode is to greatly reduce the turn-off time with signal input amplitudes greater than 300

T

K

R3

C3

OFF

DT

A

≈×

×

3.8

3.6

3.4

3.2

3.0

2.8

2.6

2.4

2.2

0

80

160

240

320

400

480

560

640

720

Input Signal Level (mV

)

RMS