Datasheet > ATA5823C-PLQW-1

ATA5823C-PLQW-1

更新时间： 2024-01-03 06:57:33

品牌	Logo	应用领域
美国微芯 - MICROCHIP		电信电信集成电路
页数	文件大小	规格书
82页	2864K
描述
Telecom Circuit, 1-Func, 7 X 7 MM, LEAD FREE, QFN-48

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ATA5823C-PLQW-1 技术参数

生命周期：	Obsolete	包装说明：	HVQCCN,
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.65	JESD-30 代码：	S-XQCC-N48
长度：	7 mm	功能数量：	1
端子数量：	48	最高工作温度：	105 °C
最低工作温度：	-40 °C	封装主体材料：	UNSPECIFIED
封装代码：	HVQCCN	封装形状：	SQUARE
封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE	座面最大高度：	0.95 mm
标称供电电压：	3 V	表面贴装：	YES
电信集成电路类型：	TELECOM CIRCUIT	温度等级：	INDUSTRIAL
端子形式：	NO LEAD	端子节距：	0.5 mm
端子位置：	QUAD	宽度：	7 mm
Base Number Matches：	1

ATA5823C-PLQW-1 数据手册

Typical Key Fob Application for Bi-directional RKE

Figure 3-1. Typical Key Fob Application for Bi-directional RKE with 5dBm TX Power, 433.92MHz

C₁₁

L₁

C₇

C₆

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

VSS

VSINT

C₈

C₉

C₁₀

XTAL2

Loop antenna

C₁

13.25311 MHz

C₂

C₃

+ Lithium cell

Figure 3-1 shows a typical 433.92MHz RKE key fob application. The external components are 10 capacitors, 1 resistor, 2

inductors and a crystal. C₁to C₃are 68nF voltage supply blocking capacitors. C₅is a 10nF supply blocking capacitor. C₆is a

15nF 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 1pF to 33pF. L₁is a matching inductor of about 5.6nH to 56nH. L₂is a feed inductor

of about 120nH. A load capacitor of 9pF for the crystal is integrated. R₁is typically 22k and sets the output power to about

5.5dBm. The loop antenna’s quality factor is somewhat reduced by this application due to the quality factor of L₂and the

RX/TX switch. On the other hand, this lower quality factor is necessary to have a robust design with a bandwidth that is wide

enough for production tolerances. Due to the single-ended and ground-referenced design, the loop antenna can be a free-

form wire around the application as it is usually employed in RKE unidirectional systems. The Atmel^®ATA5823/ATA5824

provides sufficient isolation and robust pulling behavior of internal circuits from the supply voltage as well as an integrated

VCO inductor to allow this. Since the efficiency of a loop antenna is proportional to the square of the surrounded area, it is

beneficial to have a large loop around the application board with a lower quality factor to relax the tolerance specification of

the RF matching components and to get a high antenna efficiency in spite of their lower quality factor.

ATA5823/ATA5824 [DATASHEET]

4829G–RKE–01/15

1...4 5 678 9 10...82

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