MX COM Inc MX315ADW, MX315AJ, MX315AP Datasheet

DATA BULLETIN

MX315A

CTCSS Encoder



1998 MXCOM, INC. www.mxcom.com tel: [phone] 744 5050 fax: [phone] Doc. # 20480054.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by there respective companies.

Features Applications



Field Programmable Tone
Encoder



40 CTCSS Frequencies



Crystal-Controlled Frequency
Stability



Low Distortion Sinewave Output



Few External Components
Required



CMOS Low Power Requirements



Mobile Radio Base Stations & Repeater
Stations



Mobile Radios



Hand-Held Radios



Industrial Controls

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Intercom Systems



Door-Entry Systems

Xtal/Clock

Clock

Generator

D0-D5

Xtal

Binary

Rate

Multiplier

TX Enable

TX Enable

V

DD

Programmed Clocks

TX Tone
Square
Wave

TX Tone

Sinewave

Output
Emitter

Follower

Enable

TX Tone Output

The MX315A is a monolithic CMOS tone encoder for sub-audible tone squelch systems, which provides three
additional frequencies over the earlier MX315A. These frequencies are 69.3, 97.4 and 206.5Hz. The tone
frequencies are derived from an input reference frequency. An on-chip inverter is provided to drive an
external crystal circuit.

Tone selection is achieved through six programming inputs and two control inputs (which allow either a logic
“1” or “0” to enable the device). A low distortion sinewave is generated at the TX Tone Output when the
MX315A is enabled. The emitter follower output stage can source 1mW directly into a 600 load (0dBm).

The MX315A is available in the following package styles: 16-pin SOIC (MX315ADW), 14-pin PDIP
(MX315AP) and 14-pin CDIP (MX315AJ).

CTCSS Encoder 2 MX315A



1998 MXCOM, INC. www.mxcom.com tel: [phone] 744 5050 fax: [phone] Doc. # 20480054.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by there respective companies.

CONTENTS

Section Page

1. Block Diagram................................................................................................................3

2. Signal List.......................................................................................................................4

3. External Components....................................................................................................5

4. Application .....................................................................................................................6

4.1 Interfacing and Electromagnetic Capability ......................................................................... 6

4.2 CTCSS Programming.......................................................................................................... 7

5. Performance Specification............................................................................................8

5.1 Electrical Performance ........................................................................................................ 8

5.1.1 Absolute Maximum Ratings....................................................................................................8

5.1.2 Operating Limits .....................................................................................................................8

5.1.3 Operating Characteristics.......................................................................................................8

5.2 Packaging............................................................................................................................ 9

MX•COM, Inc. reserves the right to change specifications at any time and without notice.

CTCSS Encoder 3 MX315A



1998 MXCOM, INC. www.mxcom.com tel: [phone] 744 5050 fax: [phone] Doc. # 20480054.006

4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All Trademarks and service marks are held by there respective companies.

1. Block Diagram

Xtal/Clock

Clock

Generator

D0-D5

Xtal

Binary

Rate

Multiplier

TX Enable

TX Enable

V

DD

Programmed Clocks

TX Tone
Square
Wave

TX Tone

Sinewave

Output

Emitter

Follower

Enable

TX Tone Output

Figure 1: Device Block Diagram