PRODUCT SPECIFICATION

nRF0433 Single chip RF Transceiver

Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway

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Phone +4772898900

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Fax +4772898989

Revision: 3.2

Page 8 of 14

February 2000

Output power and DC power supply current versus external bias resistor value is

shown in table 5 for a differential load of 400

Ω.

Bias resistor connected

between VDD and RF_PWR

[k

Ω

Ω]

RF output power

@ 400

Ω

Ω, differential

[dBm]

Power supply current,

[mA]

1000 / Open

10

46

150

4

37

100

-2

33

68

-12

31

Table 5. RF output power settings.

PLL loop filter

The PLL synthesizer loop filter is an external, single-ended second order lag/lead filter.

The recommended filter component values are: C1 = 270 pF, C2 =5.6 nF, R1 = 27 k

Ω.

VCO inductor

The on-chip voltage controlled oscillator (VCO) needs an external 22nH inductor

connected between the VCO1 and VCO2 pins to operate. This inductor should be a

high quality chip inductor, Q > 45 @ 433 MHz, with a maximum tolerance of ± 3%,

see table 6. See also page 9 for PCB layout guidelines.

Vendors

WWW address

Part. no., 22 nH inductors, 0805

Predan

http://www.predan.com

CS0805-220G

Pulse

http://www.pulseeng.com

PE-0805CD220GTT

PE-0805CM220GTT

Coilcraft

http://www.coilcraft.com

0805CS-220XGBC

0805HT-22NTGBC

muRata

http://www.murata.com

LQW1608A22NG00

Table 6. Vendors and part. no. for suitable 22nH inductors.

Transmit/receive mode selection

TXEN is a digital input for selection of transmit or receive mode.

TXEN = “1” selects transmit mode.

TXEN = “0” selects receive mode.

The DIN pin is the input to the digital modulator of the transmitter. The input signal to

this pin should be standard CMOS logic level at data rates up to 9600 bit/s.

The demodulated digital output data appear at the DOUT pin at standard CMOS logic

∆f → “1”, f

∆f → “0”.

Frequency difference between transmitter and receiver

For optimum performance, the total frequency difference between transmitter and

receiver should not exceed 70 ppm (30 kHz). This yields a crystal stability requirement