Datasheet > NRF902

NRF902

更新时间： 2022-11-24 21:40:20

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页数	文件大小	规格书
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描述
Single chip 868 MHz Transmitter

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NRF902 数据手册

PRELIMINARY PRODUCT SPECIFICATION

nRF902 Single chip 868 MHz Transmitter

ASK modulation.

ASK modulation can be realised by using the REXT pin (see Figure 8). When R2 is

connected to VDD, the chip transmits a carrier. When the bias resistor is connected to

VSS then the internal output power amplifier is turned off. These two situations

represent logic ‘1’ and logic ‘0’ in an ASK system. When ASK modulation is used,

the FSK pin must be connected to VDD.

X1 13.567MHz

VDD

VSS

ant1

xtal

nRF902

Data

Input

Matching Network/

Antenna

REXT

Clock

Output

ant2

FSK

XO8

VDD

Figure 8. FSK transmitter in ASK Transmit mode

Antenna output

The “ant” output pins provide a balanced RF output to the antenna. The pins must

have a DC path to V_DD, either via a RF choke or via the centre point in a loop antenna.

The load impedance seen between the ant1/ant2 outputs should be in the range 200-

700W. A load impedance of 400W is recommended if maximum output power

(10dBm) is needed. Lower load impedance (for instance 50 W) can be obtained by

fitting a simple matching network or a RF transformer (balun). The 50 W load can

also be connected directly between the ant1/ant2 pins, but this will result in higher

current consumption for a given output power to the antenna.

Note: Application notes of antenna layout solutions with matching networks will soon

be available on our website: http://www.nvlsi.no.

Nordic VLSI ASA

Revision: 1.0

Vestre Rosten 81, N-7075 Tiller, Norway

Phone +4772898900

Fax +4772898989

April 2000

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