這三款新的集成電路與引腳兼容，這意味著它們?cè)诓桓陌逶O(shè)計(jì)的條件下便可用于所有標(biāo)準(zhǔn)的汽車頻率范圍：313-317 MHz (ATA5723)、432-436 MHz (ATA5724) 以及 868-870 MHz (ATA5728)。這些器件是使用 Atmel 的射頻 BiCMOS 工藝生產(chǎn)的。這些器件采用的是一種體積很小的 SSO20 封裝，非常適合遙控車門開關(guān) (RKE) 和汽車輪胎壓力監(jiān)測(cè)系統(tǒng) (TPMS) 應(yīng)用。
       ATA5723、ATA5724 和 ATA5728 支持專用的曼徹斯特與二相編碼信號(hào)。此外，它們還提供對(duì)數(shù) RSSI 輸出，使客戶能夠在較低的場(chǎng)強(qiáng)下實(shí)現(xiàn)較高的分辨率。這些集成電路出色的接收選擇性是通過(guò)整合的鏡頻抑制混頻器來(lái)實(shí)現(xiàn)的。

       由于整合的 IF 濾波器、低相位噪聲壓控振蕩器 (VCO)、鎖相環(huán) (PLL) 以及環(huán)路濾波器，該混頻器具有 30 dB 抑制性、-113 dBm 靈敏性以及改善的選擇性。

       新款接收器集成電路只需很少的外部器件，同時(shí)無(wú)需外部濾波器，這使它們更具成本效益。10個(gè)無(wú)源元件、1個(gè)晶體以及1個(gè)射頻天線是制作一個(gè)接收器板應(yīng)用所必備的。此外，由于集成電路具有較大的振動(dòng)空間，因此設(shè)計(jì)者能夠選擇成本極低的晶體。
       The ATA5723/ATA5724/ATA5728 is a multi-chip PLL receiver device supplied in an SSO20
package. It has been specially developed for the demands of RF low-cost data transmission systems with data rates from 1 kBit/s to 10 kBbit/s in Manchester or Bi-phase code. Its main
applications are in the areas of keyless entry systems, tire pressure monitoring systems, telemetering, and security technology systems. It can be used in the frequency receiving range of f0 = 312.5 MHz to 317.5 MHz, f0 = 431.5 MHz to 436.5 MHz or f0 = 868 MHz to 870 MHz for
ASK or FSK data transmission. All the statements made below refer to 315 MHz, 433 MHz and
868.3 MHz applications.
       主要特性:
Frequency Receiving Range of (3 Versions)
– f0 = 312.5 MHz to 317.5 MHz or
– f0 = 431.5 MHz to 436.5 MHz or
– f0 = 868 MHz to 870 MHz
30 dB Image Rejection
Receiving Bandwidth
– BIF = 300 kHz for 315 MHz/433 MHz Version
– BIF = 600 kHz for 868 MHz Version
Fully Integrated LC-VCO and PLL Loop Filter
Very High Sensitivity with Power Matched LNA
– ATA5723/ATA5724:
–107 dBm, FSK, BR_0 (1.0 kbit/s to 1.8 kBit/s), Manchester, BER 10E-3
–113 dBm, ASK, BR_0 (1.0 kbit/s to 1.8 kBit/s), Manchester, BER 10E-3
– ATA5728:
–105 dBm, FSK, BR_0 (1.0 kbit/s to 1.8 kBit/s), Manchester, BER 10E-3
–111 dBm, ASK, BR_0 (1.0 kbit/s to 1.8 kBit/s), Manchester, BER 10E-3
High System IIP3
– –18 dBm at 868 MHz
– –23 dBm at 433 MHz
– –24 dBm at 315 MHz
System 1-dB Compression Point
– –27.7 dBm at 868 MHz
– –32.7 dBm at 433 MHz
– –33.7 dBm at 315 MHz
High Large-signal Capability at GSM Band (Blocking –33 dBm at +10 MHz,
IIP3 = –24 dBm at +20 MHz)
Logarithmic RSSI Output
XTO Start-up with Negative Resistor of 1.5 k
5V to 20V Automotive Compatible Data Interface
Data Clock Available for Manchester and Bi-phase-coded Signals
Programmable Digital Noise Suppression
Low Power Consumption Due to Configurable Polling
Temperature Range –40°C to +105°C
ESD Protection 2 kV HBM, All Pins
Communication to Microcontroller Possible using a Single Bi-directional Data Line
Low-cost Solution Due to High Integration Level with Minimum External Circuitry
Requirements
       優(yōu)勢(shì):
Low BOM List Due to High Integration
Use of Low-cost 13 MHz Crystal
Lowest Average Current Consumption for Application Due to Self Polling Feature
Reuse of ATA5743 Software
World-wide Coverage with One PCB Due to 3 Versions are Pin Compatible
       系統(tǒng)方框圖:

       ATA572x方框圖:

       ATA572x應(yīng)用電路圖: