EM198810 Datasheet

INTEGRATED CIRCUIT

Elan Design

1.1 Description

The Elan EM198810 IC is a low-cost, fully integrated CMOS radio frequency (RF) transceiver block,

combined with a 64-byte buffered framer block. The RF transceiver block is a self-contained, fast-

hopping GFSK data modem, optimised for use in the widely available 2.4 GHz ISM band. It contains

transmit, receive, VCO and PLL functions, including an on-chip channel filter and resonator, thus

minimizing the need for external components. The receiver utilizes extensive digital processing for

excellent overall performance, even in the presence of interference and transmitter impairments.

Transmit power is digitally controlled. The low-IF receiver architecture results in sensitivity to -80dBm

or better, with impressive selectivity.

In normal applications, the EM198810 is connected to a low cost microcontroller(ex:EM78P451S).

In normal application The on-chip framer processes and stores the RF data in the background,

unloading this critical timing function from the MCU. This lowers MCU speed requirements, expedites

product development time, and frees the MCU for implementing additional product features.

The framer register settings determine the over-the-air formatting characteristics. Many configurations

are possible, depending on the user’s specific needs. Raw transmit data is easily sent over-the-air as

a complete frame of data, with preamble, address, payload, and CRC. Receiving data is just the

opposite, using the preamble to train the receiver clock recovery, then the address is checked, then

the data is reverse formatted for receive, followed by CRC. All of this is done in hardware to ease the

programming and overhead requirements of the baseband MCU.

For longer battery life, power consumption is minimized by automatic enabling of the various transmit,

receive, PLL, and PA sections, depending on the instantaneous state of the chip. A sleep mode is also

provided for ultra low current consumption.

This product is available in 32-lead 5x5 mm JEDEC standard QFN package, featuring an exposed pad

on the bottom for best RF characteristics. Lead-free RoHS compliant packaging is available on

request.

This spec is subject to change

without any notice

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24.Dec.2006