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Details, datasheet, quote on part number:MX014
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Datasheet text preview:
DATA BULLETIN
MX014
Features
· CTCSS Compatible · Fixed Frequency Inversion · Low Power CMOS
Voice Band inverter
Applications
· Land Mobile Radio Systems · Community Repeaters
BALMOD
DEEMP Out
RX Buffer In
TX Audio Feedback TX Audio In
6dB/Octave Pre-emphasis 10dB Gain
Rx Path
Path Invert
TX Buffer In
BPF Out
Filter
TX
6dB/Octave De-emphasis
TX Audio Out
TX
BIAS RX Audio In
Bandpass Filter 300-3033 Hz
Bandpass Filter 300-3033 Hz
Filsav 1
BIAS
RX Path
Filsav 1
RX Path
Carrier
RX Audio Out
Filsav 2
RX Audio Feedback
3333 Hz PTT PTT RX Audio Enable RX Audio Enable PTL PTL Privacy Enable
Clock Carrier
Filsav 1 Filsav 2
CLK 3333 Hz CLK Generator Clock
LOGIC
RX Path EMPSAV TX Path Invert 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, PvtSQUELCHTM 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. w w w .mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies.
Voice Band Inverter
2
MX014
CONTENTS
Section Page
1. Block Diagram ...... .......... 3 2. Signal List ........ 4 3. External Components .... 5 4. Application ...... 6 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 ......... ...... 10
MX·COM, Inc. reserves the right to change specifications at any time and without notice.
© 1997 MX·COM, INC. w w w .mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies.
Voice Band Inverter
3
MX014
1. Block Diagram
BALMOD DEEMP Out RX Buffer In TX Buffer In BPF Out Filter
TX Audio Feedback TX Audio In
6dB/Octave Pre-emphasis 10dB Gain
Rx Path
Path Invert
TX
6dB/Octave De-emphasis
TX Audio Out
TX
BIAS RX Audio In
Bandpass Filter 300-3033 Hz
Bandpass Filter 300-3033 Hz
Filsav 1
BIAS
RX Path
Filsav 1
RX Path
Carrier
RX Audio Out
Filsav 2
RX Audio Feedback
3333 Hz PTT PTT RX Audio Enable RX Audio Enable PTL PTL Privacy Enable
Clock Carrier
Filsav 1 Filsav 2
CLK 3333 Hz CLK Generator Clock
LOGIC
RX Path EMPSAV TX Path Invert V DD V SS BIAS
Figure 1: Device Block Diagram
© 1997 MX·COM, INC. w w w .mxcom.com Tele: 800 638 5577 910 744 5050 Fax: 910 744 5054 Doc. # 20480013.006 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA All trademarks and service marks are held by there respective companies.
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