SN250 datasheet(19/130 Pages) STMICROELECTRONICS

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SN250

Electrical characteristics

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5.5.2

Transmit

Table 8 lists the key parameters of the integrated IEEE 802.15.4 transmitter on the SN250.

5.5.3

Synthesizer

Table 9 lists the key parameters of the integrated synthesizer on the SN250.

Table 8.

Transmit characteristics

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Maximum output power (boost

mode)

At highest power setting

dBm

Maximum output power

At highest power setting

dBm

Minimum output power

At lowest power setting

− 32

dBm

Error vector magnitude

As defined by IEEE

802.15.4, which sets a

35% maximum

Carrier frequency error

− 40

+ 40

ppm

Load impedance

200

PSD mask relative

3.5MHz away

− 20

PSD mask absolute

3.5MHz away

− 30

dBm

Table 9.

Synthesizer characteristics

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Frequency range

2400

2500

MHz

Frequency resolution

11.7

kHz

Lock time

From off, with correct VCO DAC

setting

100

μs

Relock time

Channel change or RX/TX

turnaround (IEEE 802.15.4 defines

192

μs turnaround time)

100

μs

Phase noise at 100kHz

− 71

dBc/Hz

Phase noise at 1MHz

− 91

dBc/Hz

Phase noise at 4MHz

− 103

dBc/Hz

Phase noise at 10MHz

− 111

dBc/Hz

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