NRF902 Datasheet, PDF (10/13 Pages) List of Unclassifed Manufacturers – Single chip 868 MHz Transmitter

PRELIMINARY PRODUCT SPECIFICATION
nRF902 Single chip 868 MHz Transmitter
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:
Co ≤ 3 pF
ESR ≤ 50 ohm .
C_L = 12 pF
Crystal parallel equivalent capacitor
Crystal equivalent series resistor
Crystal load capacitor
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
22kΩ
82kΩ
180kΩ
RF output power
10dBm
0dBm
-10dBm
DC current consumption
30mA
15mA
9mA
Conditions: VDD = 3.0V, VSS = 0V, T_A = 27ºC, Load impedance = 400 Ω.
Table 5. RF output power setting for the nRF902.
Nordic VLSI ASA
Revision: 1.0
- Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Page 10 of 13
April 2000