DATA BULLETIN
MX315A CTCSS Encoder
Features
Applications
Field Programmable Tone
Encoder
Mobile Radio Base Stations & Repeater
Stations
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40 CTCSS Frequencies
Mobile Radios
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Crystal-Controlled Frequency
Stability
Hand-Held Radios
Industrial Controls
Intercom Systems
Door-Entry Systems
Low Distortion Sinewave Output
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Few External Components
Required
CMOS Low Power Requirements
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Clock
Xtal/Clock
Generator
Xtal
Binary
Programmed Clocks
Rate
D0-D5
Multiplier
TX Tone
Sinewave
TX Tone
Square
Wave
Output
VDD
Emitter
TX Tone Output
Follower
TX Enable
TX Enable
Enable
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 600ꢂ load (0dBm).
The MX315A is available in the following package styles: 16-pin SOIC (MX315ADW), 14-pin PDIP
(MX315AP) and 14-pin CDIP (MX315AJ).
1998 MX COM, INC.
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480054.006
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4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
All Trademarks and service marks are held by there respective companies.