Description
The MTX-705/15/35 FSK/ASK transmitter is
designed for applications in the 315 MHz, 433 MHz, or 868
MHz industrial-scientific-medical (ISM) band, according to
the EN 300 220 telecommunications standard; but it can also
be used in any other country with similar frequency bands.
The MTX-705/15/35 transmitter consists of a fully
integrated voltage-controlled oscilattor, a divide-by-32 divider,
a phase-frequency detector and a charge pump. An internal
loop filter determines the dynamic behavior of the PLL and
suppresses reference spurious signals. A Colpitts crystal
oscillator is used as the reference oscillator of a phaselocked
loop synthesizer. The VCO's output signal feeds the
power amplifier. |
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Key Features
 Fully integrated PLL-stabilized VCO
Frequency range from 250-350MHz, 380-450MHz,
or 850-930MHz
Single-ended RF output
FSK through crystal pulling allows modulation from
DC to 40 kbit/s
High FSK deviation possible for wideband data
transmission
ASK achieved by on/off keying of internal power
amplifier up to 40 kbit/s
Very low standby current
On-chip low voltage detector
High over-all frequency accuracy
FSK deviation and center frequency independently
adjustable
Adjustable output power range: -11 to +10 dBm
Adjustable current consumption: 3.4 to 10.6 mA |
Typical Applications
General digital data transmission
Tire Pressure Monitoring System (TPMS)
Remote Keyless Entry (RKE)
Low-power telemetry
Alarm and security systems
Garage door openers
Home automation |
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