STS1TX datasheet(19/70 Pages) STMICROELECTRONICS

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DocID025109 Rev 1

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STS1TX

Characteristics

6.2.4

Crystal oscillator

Characteristics measured over recommended operating conditions unless otherwise

specified. All typical values are referred to TA = 25 °C, VBAT = 3.0 V. Frequency synthesizer

characteristics are referred to 915 MHz band.

PHARM

Harmonics level

RF = 170 MHz, 2nd harmonic (max

power level)

--36

dBm

RF = 170 MHz, 3rd harmonic (max

power level)

--55

RF = 315 MHz, 2nd harmonic (max

power level)

--52

dBc

RF = 315 MHz, 3rd harmonic (max

power level)

--52

RF = 433 MHz, 2nd harmonic (max

power level)

--43

dBm

RF = 433 MHz, 3rd harmonic (max

power level)

--46

RF = 868 MHz, 2nd harmonic (max

power level)

--40

RF = 868 MHz, 3rd harmonic (max

power level)

--42

RF = 915 MHz, 2nd harmonic (max

power level)

-28

dBc

RF = 915 MHz, 3rd harmonic (max

power level)

--42

dBm

RF = 922 MHz, 2nd harmonic (max

power level)

--39

RF = 922 MHz, 3rd harmonic (max

power level)

--60

PALOAD

Optimum load

impedance (simulated

values)

170 MHz, using reference design

46 +

j36

Ohm

315 MHz, using reference design

25 +

j27

Ohm

433 MHz, using reference design

29 +

j19

Ohm

868 MHz, using reference design

34 - j7

Ohm

915 MHz, using reference design

15 +

j28

Ohm

922 MHz, using reference design

42 -

j15

Ohm

1. In ASK/OOK modulation, indicated value represents peak power.

Table 12. RF transmitter characteristics (continued)

Symbol

Parameter

Test conditions

Min.

Typ.

Max.

Unit

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