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PDF EVB72016 Data sheet ( Hoja de datos )
| Número de pieza | EVB72016 | |
| Descripción | 433MHz FSK/ASK Transmitter Evaluation Board Description | |
| Fabricantes | Melexis Microelectronic Systems | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de EVB72016 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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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
www.DataSheet4U.copmower 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.
3901272016 01
Rev. 004
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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
www.DataSheetc4hUo.csoemn 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
Rev. 004
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EVB Description
June/07
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Your Notes
www.DataSheet4U.com
EVB72016
433MHz FSK/ASK Transmitter
Evaluation Board Description
3901272016 01
Rev. 004
Page 11 of 12
EVB Description
June/07
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet EVB72016.PDF ] | |
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