EVB72016-433-FM-C datasheet, PDF

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EVB72016-433-FM-C: Description433MHz FSK/ASK Transmitter Evaluation Board Description; File Size501KB，12 Pages; ManufacturerMelexis; Websitehttps://www.melexis.com/zh

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EVB72016-433-FM-C Overview

433MHz FSK/ASK Transmitter Evaluation Board Description

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EVB72016

433MHz FSK/ASK Transmitter

Evaluation Board Description

Features

Fully integrated PLL-stabilized VCO

Frequency range from 380 MHz to 450 MHz

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

Wide power supply range from 1.95 V to 5.5 V

Microcontroller clock output

Very low standby current

On-chip low voltage detector

High over-all frequency accuracy

FSK deviation and center frequency independ-

ently adjustable

Adjustable output power range from

-12 dBm to +10 dBm (at 50

Ω)

Adjustable current consumption from

3.8 mA to 11.0 mA

Conforms to EN 300 220 and similar standards

Ordering Information

Part No. (see paragraph 5)

EVB72016-433-FSK-C

Note:

EVB default population is FSK, ASK modification according to section 3.1.

Application Examples

General digital data transmission

Tire Pressure Monitoring Systems (TPMS)

Remote Keyless Entry (RKE)

Wireless access control

Alarm and security systems

Garage door openers

Remote Controls

Home and building automation

Low-power telemetry systems

Evaluation Board Example

General Description

The TH72016 evaluation board is designed to demonstrate the performance of the transmitter IC for conduc-

tive measurements. The power amplifier is matched to 50 Ohms by means of a

π-matching

network to oper-

ate at a resonant frequency of 433 MHz.

The EVB72016 also features a clock output applicable to drive a microcontroller. The clock frequency can be

selected by an external logic signal.

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EVB Description

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EVB72016

433MHz FSK/ASK Transmitter

Evaluation Board Description

Document Content

Theory of Operation ...................................................................................................3

1.1

1.2

General............................................................................................................................. 3

Block Diagram .................................................................................................................. 3

Functional Description ..............................................................................................3

2.1

2.2

2.3

2.4

2.5

2.6

2.7

2.8

2.9

2.10

Crystal Oscillator .............................................................................................................. 3

FSK Modulation ................................................................................................................ 4

Crystal Pulling................................................................................................................... 4

ASK Modulation................................................................................................................ 5

Output Power Selection.................................................................................................... 5

Lock Detection.................................................................................................................. 5

Low Voltage Detection...................................................................................................... 5

Mode Control Logic .......................................................................................................... 6

Clock Output..................................................................................................................... 6

Timing Diagrams .............................................................................................................. 6

Connector Board Circuit Diagram.....................................................................7

3.1

3.2

3.3

Board Component Values ................................................................................................ 7

Connector Board PCB Top View .............................................................................. 8

Board Connection............................................................................................................. 8

Evaluation Board Layout ...........................................................................................9

Board Variants............................................................................................................9

Package Description ................................................................................................10

6.1

6.2

Soldering Information ..................................................................................................... 10

Recommended PCB Footprints ...................................................................................... 10

Disclaimer .................................................................................................................12

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EVB Description

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EVB72016

433MHz FSK/ASK Transmitter

Evaluation Board Description

2.4

ASK Modulation

The TH72016 can be ASK-modulated by applying data directly at pin PSEL. This turns the PA on and off

which leads to an ASK signal at the output.

2.5

Output Power Selection

The transmitter is provided with an output power selection feature. There are four predefined output power

steps and one off-step accessible via the power selection pin PSEL. A digital power step adjustment was

chosen because of its high accuracy and stability. The number of steps and the step sizes as well as the

corresponding power levels are selected to cover a wide spectrum of different applications.

The implementation of the output power control

logic is shown in figure 4. There are two

matched current sources with an amount of

about 8 µA. One current source is directly ap-

plied to the PSEL pin. The other current source

is used for the generation of reference voltages

with a resistor ladder. These reference voltages

are defining the thresholds between the power

steps. The four comparators deliver thermome-

ter-coded control signals depending on the

voltage level at the pin PSEL. In order to have a

certain amount of ripple tolerance in a noisy

environment the comparators are provided with

a little hysteresis of about 20 mV. With these

control signals, weighted current sources of the

power amplifier are switched on or off to set the

desired output power level (Digitally Controlled

Current Source). The LOCK signal and the

output of the low voltage detector are gating

this current source.

RPS

PSEL

OUT

Fig. 4:

Block diagram of output power control circuitry

There are two ways to select the desired output power step. First by applying a DC voltage at the pin PSEL,

then this voltage directly selects the desired output power step. This kind of power selection can be used if

the transmission power must be changed during operation. For a fixed-power application a resistor can be

used which is connected from the PSEL pin to ground. The voltage drop across this resistor selects the de-

sired output power level. For fixed-power applications at the highest power step this resistor can be omitted.

The pin PSEL is in a high impedance state during the “TX standby” mode.

2.6

Lock Detection

The lock detection circuitry turns on the power amplifier only after PLL lock. This prevents from unwanted

emission of the transmitter if the PLL is unlocked.

2.7

Low Voltage Detection

The supply voltage is sensed by a low voltage detect circuitry. The power amplifier is turned off if the supply

voltage drops below a value of about 1.85 V. This is done in order to prevent unwanted emission of the

transmitter if the supply voltage is too low.

3901272016 01

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EVB Description

June/07

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