OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

nRF24AP1

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
PRODUCT SPECIFICATION
nRF24AP1 Single Chip 2.4 GHz Radio Transceiver with Embedded ANT Protocol
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 1.0 Page 16 of 25 September 2006
11. PERIPHERAL RF INFORMATION
11.1 Antenna output
The ANT1 & ANT2 output pins provide a balanced RF output to the antenna. The pins
must have a DC path to VDD, either via a RF choke or via the center point in a dipole
antenna. A load of 100Ω+j175Ω between the ANT1/ANT2 is recommended for
maximum output power (0dBm). Lower load impedance (for instance 50 Ω) can be
obtained by fitting a simple matching network.
11.2 Output Power adjustment
RF output power Peak current
consumption
0 dBm ±3dB 16.0 mA
-5 dBm ±3dB 13.5 mA
-10 dBm ±3dB 12.5 mA
-20 dBm ±3dB 12 mA
Conditions: VDD = 3.0V, VSS = 0V, T
A
= 27ºC, Load impedance = 100Ω+j175Ω.
Table 8: RF output power setting for the nRF24AP1
11.3 Crystal Specification
Tolerance includes initially accuracy and tolerance over temperature and aging.
Frequency C
L
ESR C
0max
Tolerance
16 12pF
100 Ω
7.0pF ±50ppm
Table 9: Crystal specification of the nRF24AP1
To achieve a crystal oscillator solution with low power consumption and fast start-up
time, it is recommended to specify the crystal with a low value of crystal load
capacitance. Specifying C
L
=12pF is OK, but it is possible to use up to 16pF. Specifying a
lower value of crystal parallel equivalent capacitance, C
0
will also work, but this can
increase the price of the crystal itself. Typically C
0
=1.5pF at a crystal specified for
C
0max
=7.0pF.
PRODUCT SPECIFICATION
nRF24AP1 Single Chip 2.4 GHz Radio Transceiver with Embedded ANT Protocol
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 1.0 Page 17 of 25 September 2006
11.4 Sharing crystal with micro controller
When using a micro controller to drive the crystal reference input XC1 of the nRF24AP1
transceiver some rules must be followed.
11.5 Crystal parameters:
When the micro controller drives the nRF24AP1 clock input, the requirement of load
capacitance C
L
is set by the micro controller only. The frequency accuracy of ±50 ppm is
still required to get a functional radio link. The nRF24AP1 will load the crystal by 0.5pF
at XC1 in addition to the PBC routing.
11.6 Input crystal amplitude & Current consumption
The input signal should not have amplitudes exceeding any rail voltage, but any DC-
voltage within this is OK. Exceeding rail voltage will excite the ESD structure and the
radio performance is degraded below specification. If testing the nRF24AP1 with a RF
source with no DC offset as the reference source, the input signal will go below the
ground level, which is not acceptable.
XC1
XO_OUT
Amplitude
controlled
current source
Buffer:
Sine to
full swing
Current starved
inverter:
XOSC core
XC2
Vdd
Vss
Vdd
Vss
ESD
ESD
Figure 4: Principle of crystal oscillator
It is recommended to use a DC-block before the XC1 pin so that the internal ESD
structures will self bias the XC1 voltage.
The nRF24AP1 crystal oscillator is amplitude regulated. To achieve low current
consumption and also good signal-to-noise ratio, it is recommended to use an input signal
larger than 0.4 V-peak. The needed input swing is independent of the crystal frequency.
When clocking the nRF24AP1 externally, XC2 is not used and can be left as an open pin.
PRODUCT SPECIFICATION
nRF24AP1 Single Chip 2.4 GHz Radio Transceiver with Embedded ANT Protocol
Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone +4772898900 - Fax +4772898989
Revision: 1.0 Page 18 of 25 September 2006
11.7 PCB layout and de-coupling guidelines
A well-designed PCB is necessary to achieve good RF performance. Keep in mind that a
poor layout may lead to loss of performance, or even functionality, if due care is not
taken. A fully qualified RF-layout for the nRF24AP1 and its surrounding components,
including matching networks, can be downloaded from www.nordicsemi.no.
A PCB with a minimum of two layers including a ground plane is recommended for
optimum performance. The nRF24AP1 DC supply voltage should be de-coupled as close
as possible to the VDD pins with high performance RF capacitors, see Table 10. It is
preferable to mount a large surface mount capacitor (e.g. 4.7µF tantalum) in parallel with
the smaller value capacitors. The nRF24AP1 supply voltage should be filtered and routed
separately from the supply voltages of any digital circuitry.
Long power supply lines on the PCB should be avoided. All device grounds, VDD
connections and VDD bypass capacitors must be connected as close as possible to the
nRF24AP1 IC. For a PCB with a topside RF ground plane, the VSS pins should be
connected directly to the ground plane. For a PCB with a bottom ground plane, the best
technique is to have via holes as close as possible to the VSS pads. One via hole should
be used for each VSS pin.
Full swing digital data or control signals should not be routed close to the crystal or the
power supply lines.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25

nRF24AP1

Mfr. #:
Buy nRF24AP1
Manufacturer:
Nordic Semiconductor
Description:
RF Transceiver 1.9-3.6V 2.4GHz XCVR W/EMB ANT PROTOCOL
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet