Datasheet > ATA5824-PLQW80

ATA5824-PLQW80

更新时间： 2024-02-02 21:01:48

品牌	Logo	应用领域
爱特美尔 - ATMEL		/
页数	文件大小	规格书
98页	3631K
描述
Telecom IC, PQCC48

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ATA5824-PLQW80 数据手册

ATA5823/ATA5824

4. Typical Car Application for Bi-directional RKE

Figure 4-1. Typical Car Application for Bi-directional RKE with 10 dBm TX Power, 433.92

MHz

C₁₁

L₄

L₃

C₇

C₆

SAW-Filter

CDEM

RSSI

TEST3

RF_IN

SCK

SDI_TMDI

SDO_TMDO

CLK

C₅

AVCC

Microcontroller

433_N868

ATA5823/ATA5824

R₁

L₂

R_PWR

PWR_H

RF_OUT

IRQ

POUT

VCC

VSINT

VSS

50Ω

connector

C₈

C₉

L₁

C₁₀

XTAL2

RF_OUT

13.25311 MHz

C₁C₂

C₄

C₃

V_CC= 4.4V to 5.25V

Figure 4-1 shows a typical 433.92 MHz V_CC= 4.4V to 5.25V RKE car application. The external

components are 11 capacitors, 1 resistor, 4 inductors, a SAW filter and a crystal. C₁, C₃and C₄

are 68 nF voltage supply blocking capacitors. C₂is a 2.2 µF supply blocking capacitor for the

internal voltage regulator. C₅is a 10 nF supply blocking capacitor. C₆is a 15 nF fixed capacitor

used for the internal quasi-peak detector and for the high-pass 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 crystal of 9 pF is integrated. R₁is typically 22 kΩ

and sets the output power at RF_OUTto about 10 dBm. Since a quarter wave or PCB antenna,

which has high efficiency and wideband 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. L₁, C₁₀and

C₉together form a low-pass filter, which is needed to filter out the harmonics in the transmitted

signal to meet regulations.

4829D–RKE–06/06

1...4 5 678 9 10...98

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