Datasheet > NRF401

NRF401

更新时间： 2022-11-26 05:42:03

品牌	Logo	应用领域
其他 - ETC		射频
页数	文件大小	规格书
18页	275K
描述
433MHz Single Chip RF Transceiver

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NRF401 数据手册

PRODUCT SPECIFICATION

nRF401 Single Chip RF Transceiver

PLL loop filter

The synthesiser loop filter is an external, single-ended second order lag-lead filter.

The recommended filter component values are: C3 = 820 pF, C4 =15 nF, and

R2 = 4.7 kW, see Figure 12.

VCO inductor

An external 22nH inductor connected between the VCO1 and VCO2 pins is required

for the on-chip voltage controlled oscillator (VCO). This inductor should be a high

quality chip inductor, Q > 45 @ 433 MHz, with a maximum tolerance of ± 2%. The

following 22 nH inductors (0603) are suitable for use with nRF401.

Vendors

WWW address

Part. no., 22 nH inductors, 0603

size

Pulse

http://www.pulseeng.com PE-0603CD220GTT

Coilcraft

muRata

Stetco

KOA

http://www.coilcraft.com

http://www.murata.com

http://www.stetco.com

0603CS-22NXGBC

LQW1608A22NG00

0603G220GTE

http://www.koaspeer.com KQ0603TE22NG

Table 7. Vendors and part no. for suitable 22nH inductors.

See page 11 and 12 for PCB layout guidelines regarding placement of the inductor.

Crystal specification

To achieve an active crystal oscillator (XOSC) with low power consumption, certain

requirements apply for crystal loss and capacitive load.

The crystal specification is:

f= 4.0000 MHz

Crystal parallel resonant frequency

Co £ 5 pF

Crystal parallel equivalent capacitance

ESR £150 ohm .

C_L£ 14 pF

Crystal equivalent series resistance

Total crystal load capacitance, including capacitance in PCB

layout.

For the crystal oscillator shown in Figure 10 the load capacitance becomes:

C1´×C2´

C_L=

Where C1´ = C1 + C_PCB1and C2´ = C2 + C_PCB2

C1´+ C2´

C1 and C2 are 0603 SMD capacitors as shown in the application schematic, see

Figure 12 and Table 9. C_PCB1and C_PCB2are the layout parasitic capacitance on the

circuit board.

Nordic VLSI ASA

Revision: 1.5

Vestre Rosten 81, N-7075 Tiller, Norway

Phone +4772898900

Fax +4772898989

May 2000

Page 9 of 18

1...6 7 8910 11 12...18

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