ATA5428-PLSW datasheet(8/100 Pages) ATMEL

8 / 100 page

4841D–WIRE–10/07

ATA5423/ATA5425/ATA5428/ATA5429

2.2

Typical Base-station Application (5V)

Figure 2.2 shows a typical 433.92 MHz V

CC = 4.75V to 5.25V Base-station Application (5V). The

external components are 12 capacitors, 1 resistor, 4 inductors, a SAW filter, and a crystal. C

and C

3 to C4 are 68 nF voltage supply blocking capacitors. C2 and C12 are 2.2 µF supply block-

ing capacitors for the internal voltage regulators. C

5 is a 10 nF supply blocking capacitor. C6 is a

15 nF fixed capacitor used for the internal quasi-peak detector and for the high-pass frequency

of the data filter. C

7 to C11 are RF matching capacitors in the range of 1 pF to 33 pF. L2 to L4 are

matching inductors of about 5.6 nH to 56 nH. A load capacitor for the crystal of 9 pF is inte-

grated. R

1 is typically 22 kΩ and sets the output power at RF_OUT to about 10 dBm. Since a

quarter wave or PCB antenna, which has high efficiency and wide band operation, is typically

used here, it is recommended to use a SAW filter to achieve high sensitivity in case of powerful

out-of-band blockers. L

1, C9 and C10 together form a low-pass filter, which is needed to filter out

the harmonics in the transmitted signal to meet regulations. An internally regulated voltage at pin

VSOUT can be used in case the microcontroller only supports 3.3V operation, a blocking capac-

itor with a value of C

12 = 2.2 µF has to be connected to VSOUT in any case.

Figure 2-2.

Typical Base-station Application (5V), 433.92 MHz

RSSI

CDEM

SCK

DEM_OUT

SDI_TMDI

SDO_TMDO

CLK

VSINT

XTAL2

AVCC

Ω

connector

SAW-Filter

13.25311 MHz

VCC = 4.75V to 5.25V

N_RESET

IRQ

RF_IN

C11

C12

433_N868

RF_OUT

PWR_H

R_PWR

C10

RFOUT

VCC

VSS

Sensor

ATmega

48/88/168

ATA5423/ATA5425

ATA5428/ATA5429

ATA5428-PLSW Datasheet(PDF) 8 Page - ATMEL Corporation

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