Datasheet > ATA5812-PLQW

ATA5812-PLQW

更新时间： 2024-02-02 13:18:05

品牌	Logo	应用领域
爱特美尔 - ATMEL		/
页数	文件大小	规格书
92页	1079K
描述
UHF ASK/FSK TRANSCEIVER

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ATA5812-PLQW 数据手册

ATA5811/ATA5812

3. Typical Car or Sensor Base-station Application

Figure 3-1. Typical RKE Car or Sensor Base-station Application, 433.92 MHz

C₁₁

L₄

L₃

C₇

C₆

SAW-Filter

CDEM

RSSI

DEM_OUT

RF_IN

SCK

SDI_TMDI

SDO_TMDO

CLK

C₅

AVCC

433_N868

Microcontroller

R₁

ATA5811/ATA5812

L₂

R_PWR

PWR_H

RF_OUT

IRQ

N_RESET

VSINT

VCC

VSS

50Ω

L₁

connector

C₈

C₉

XTAL2

C₁₀

RF_OUT

C₁₂

13.25311 MHz

C₁C₂

C₄

C₃

= 4.75V to 5.25V

Figure 3-1 shows a typical 433.92 MHz V_CC= 4.75V to 5.25V RKE car or sensor base-station

application. The external components are 12 capacitors, 1 resistor, 4 inductors, a SAW filter and

a crystal. C₁and C₃to C₄are 68 nF voltage supply blocking capacitors. C₂and C₁₂are 2.2 µF

supply blocking capacitors for the internal voltage regulators. C₅is a 10 nF supply blocking

capacitor. C₆is a 15 nF fixed capacitor used for the internal quasi peak detector and for the

highpass frequency of the data filter. C₇to C₁₁are RF matching capacitors in the range of 1 pF

to 33 pF. L₂to L₄are matching inductors of about 5.6 nH to 56 nH. A load capacitor for the crys-

tal of 9 pF is integrated. R₁is 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 opera-

tion, is typically used here, it is recommended to use a SAW filter to achieve high sensitivity in

case of powerful out-of-band blockers. L₁, C₁₀and C₉together form a lowpass filter, which is

needed to filter out the harmonics in the transmitted signal to meet regulations. An internally reg-

ulated voltage at pin VSOUT can be used in case the microcontroller only supports 3.3V

operation, a blocking capacitor with a value of C₁₂= 2.2 µF has to be connected to VSOUT in

any case.

4689F–RKE–08/06

1...4 5 678 9 10...92

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