AN2719 Freescale Semiconductor / Motorola, AN2719 Datasheet - Page 2

• Manufacturer Part Number: AN2719
• Description: A Transmitter Using Tango3 (Step-by-step Design for ISM Bands)
• Manufacturer: Freescale Semiconductor / Motorola

Introduction
Introduction
This document provides a step-by-step approach to designing an optimized transmitter using Tango3
Even though the description is based on a 433.92 MHz design, bills of material are provided for almost
any ISM band: 315 MHz, 433.92 MHz, 868.3 MHz, and 916.5 MHz.
Tango3 Presentation
Main Features
Tango3 is a highly integrated circuit designed for data transfer applications. It includes a PLL
integrated VCO
microcontroller. Its main features are as follows.
Tango3 is controlled through several pins:
It provides two signals:
1. Tango3 is the codename for MC33493DTB. For more technical data, refer to the MC33493DTB specification available on the
Freescale Semiconductor web site at http://www.freescale.com.
2. Phase Locked Loop. In a PLL, a VCO is locked to a multiple of the frequency of a reference oscillator by mean of a feedback
loop.
3. Voltage Controlled Oscillator.
4. Many frequencies are possible; consult Freescale Semiconductor prior to design.
5. On
has only two levels — ON and OFF.
6. Frequency Shift Keying. A digital frequency modulation system where the RF signal has only two frequencies.
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1. RFOUT: the modulated RF signal
2. DATACLK: a reference frequency for the microcontroller for data clocking
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Off Keying. A digital amplitude modulation system (sometimes called ASK — Amplitude Shift Keying) where the RF signal
Selectable frequency bands: 315–433 MHz and 868–916 MHz
OOK
Adjustable output power up to 5 dBm
1.9V–3.6V supply voltage range
Very low standby current 0.1 nA at 25°C
TSSOP14 package
MODE: FSK or OOK operation
DATA: data input
BAND: switch between low band (315–433 MHz) and high band (868–916 MHz)
ENABLE: standby/on control
REXT: connected to an external resistor; allows control of the RFOUT power
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and FSK
3
and a reference oscillator using an external crystal. It can be controlled by a
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modulation
A Transmitter Using Tango3, Rev. 0
4
Freescale Semiconductor
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with a fully
1
.