MX105ALH 查看數據表（PDF） - MX-COM Inc

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比赛名单

MX105ALH

Tone Detector

MX-COM Inc  

Tone Detector

9

MX105A PRELIMINARY INFORMATION

5.9 Calculate Maximum De-response Time

TOFF

≈

−3

×



ln

VTH

VINMAX





R3 × C3 A

where: VTH is the detect filter sensitivity.

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

mVRMS. This graph is for VDD = 5V; for lower VDD KDT increases.

TOFF ≈ KDT × R3 × C3A

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 (mVRMS)

Figure 4: KDT Factor for TOFF vs. Signal Input Amplitude

© 1997 MX•COM, INC.

www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054

Doc.# 20480133.003

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA

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