DATA BULLETIN

MX105A

Tone Detector

© 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

All trademarks and service marks are held by their respective companies.

PRELIMINARY INFORMATION

• FEATURES

• APPLICATIONS

• Operates in High Noise Conditions

• ≥36 dB Signal Input Range

• High Sensitivity

• Low Power Operation 2.7 V to 5.5 V

• Adjustable Bandwidth

• Adjustable Frequency

• Single and Multitone System

Applications

Loop

Filter

Detect

Filter

Timing

Logic

VCO

Detect Counter

- +

-

V/2

DD

Tone In

C4

R2

R3

C5

Input Amp

C6

R1

Detect

Out

R4

7

8

4

2

1

3

16

5

6

10

9

14

15

13

12

11

MX105A

- +

The MX105A is a monolithic CMOS tone detector for tone decoding in single and multitone signaling systems. Using

phase locked loop (PLL) decoding techniques, the MX105A recognizes tones in the presence of high noise levels and

strong adjacent channel tones. Detection frequency and bandwidth can each be independently adjusted. The design is

immune to high levels of harmonic and sub-harmonic noise. It also maintains excellent noise immunity and constant

bandwidth over a wide range of input signal levels.

The MX105A requires a voltage supply of 2.7V to 5.5V and is available in the following package styles: 16-pin SOIC

(MX105ADW), 16-pin PDIP (MX105AP), and 24-pin PLCC (MX105ALH).