MX014 Datasheet, PDF (1/12 Pages) CML Microcircuits – Voice Band inverter

DATA BULLETIN
MX014 Voice Band inverter
Features
• CTCSS Compatible
• Fixed Frequency Inversion
• Low Power CMOS
Applications
• Land Mobile Radio Systems
• Community Repeaters
TX Audio Feedback
TX Audio In
BIAS
Rx Path
6dB/Octave
Pre-emphasis
10dB Gain
RX Audio In
RX Audio Feedback
RX Path
Path Invert
Bandpass
Filter
300-3033 Hz
Filsav 1
Bandpass
Filter
300-3033 Hz
Carrier
Filsav 2
6dB/Octave
De-emphasis
Filsav 1
TX
BIAS
TX Audio Out
TX
RX Path _{RX Audio Out}
3333 Hz
PTT
PTT
RX Audio Enable
RX Audio Enable
PTL
PTL
Privacy Enable
LOGIC
Carrier
Filsav 1
Filsav 2
RX Path
EMPSAV
TX
Path Invert
CLK
3333 Hz
CLK Generator
Clock
Clock
V_DD
V_SS
BIAS
The MX014 Voice Band Inverter gives the security of private voice communications to land mobile radio users, as well as
to the users of other shared radio channel systems. Designed for use in half-duplex systems, the MX014 exchanges high
and low frequencies in the voiceband and renders transmitted messages unintelligible. This privacy function is achieved
by a single frequency inversion. When used with CTCSS, PvtSQUELCH^TM privacy adapter operation is achieved.
Sharp cut-off in the internal voiceband filters permits operation with CTCSS and similar sub-audio signaling schemes. This
results in high quality recovered audio.
The core of the MX014 consists of two audio band pass filters and a balanced modulator. The device uses a
programmable clock divider which controls the carrier and filter cut-off frequencies. Control of the RX/TX, PTL and
privacy function is by pin selection.
The MX014 operates from a single 5V supply and uses a 4 MHz crystal oscillator to ensure the correct pitch in recovered
speech. Signal coupling and decoupling are the only external components needed. The device is available in 24-pin
PLCC (MX014LH), 24-pin PDIP (MX014P) and 24-pin CDIP (MX014J) packages.
© 1997 MX•COM, INC.
www.mxcom.com Tele: 800 638 5577 910 744 5050 Fax: [phone]
Doc. # 20480013.006
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
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