參數(shù)資料
型號： NRF902
廠商： Electronic Theatre Controls, Inc.
英文描述： Single chip 868 MHz Transmitter
中文描述： 單芯片868兆赫發(fā)射機(jī)
文件頁數(shù)： 10/13頁
文件大小： 160K
代理商： NRF902
PRELIMINARY PRODUCT SPECIFICATION
nRF902 Single chip 868 MHz Transmitter
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 1.0
Page 10 of 13
April 2000
Crystal Specification
Modulation is achieved by pulling of the crystal capacitance. As such to achieve
correct frequency deviation (20kHz) and frequency of operation as specified in Table
3 the crystal must meet the following specification:
pF
50
pF
12
Co
ESR
C
L
3
≤
≤
Crystal parallel equivalent capacitor
Crystal equivalent series resistor
Crystal load capacitor
ohm
.
=
Output Power adjustment
A bias resistor R2 (see Figure 6) should be connected from the REXT pin to the
positive power supply VDD. The value of this resistor determines the output power
level. See table 5 for choice of R2 value.
Power setting resistor R2
22k
82k
180k
RF output power
10dBm
0dBm
-10dBm
DC current consumption
30mA
15mA
9mA
Conditions: VDD = 3.0V, VSS = 0V, T
A
= 27oC, Load impedance = 400
.
Table 5. RF output power setting for the nRF902.
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