描述 Description

The MICRF221 is a third generation QwikRadio? receiver, offering all the benefits of Micrel's earlier QwikRadio products with significant improvements, including: enhanced sensitivity, automatic duty-cycle feature and RSSI output.The MICRF221 is a super-heterodyne receiver, designed for OOK and ASK modulation. The down-conversion mixer also provides image rejection. The MICRF221 receiver provides a SLEEP Mode for duty-cycle operation and an enhanced, customer programmable \"WAKE\" function. These features are further combined into a wholly integrated \"self-polling\" scheme that is ideal for low and ultra-low power applications, such as RKE and RFID All post-detection data filtering is provided on the MICRF221 receiver. Any one of four filter bandwidths may be selected externally by the user in binary steps, from 1.25kHz to 10kHz. The user needs only to program the device with a set of easily determined values based on data rate, code modulation format, and desired duty-cycle operation.

特性 Features

? Complete Receiver on a Chip
? -109dBm sensitivity, 1 kbps and BER 10E-02
? Image Rejection Mixer
? 850 MHz to 950 MHz frequency range
? Low Power, 9mA @ 868 MHz, continuous on
? Data Rates to 10kbps (Manchester Encoded)
? Auto polling (sleep mode, current < 0.1 mA)
?Analog RSSI Output
? Programmable “Low Sensitivity” mode
? No IF filter required
? Excellent selectivity and noise rejection
? Low external part count
? Additional Functions Programmed through serial interface?

簡介

MICRF221屬于開發(fā)板套件編程器的射頻評(píng)估開發(fā)套件開發(fā)板。由制造生產(chǎn)的MICRF221射頻評(píng)估和開發(fā)套件，開發(fā)板本系列中的產(chǎn)品適用于在已知實(shí)施環(huán)境中，提供能訪問射頻相關(guān)器件的功能或者有助于訪問該功能。所含的焦點(diǎn)產(chǎn)品范圍從射頻信號(hào)鏈元器件（如放大器和檢測器）到模塊化收發(fā)器，以及不直接包含焦點(diǎn)產(chǎn)品的適配器硬件，但此類硬件可供方便地訪問用戶單獨(dú)提供的特定射頻產(chǎn)品或系列。