S2-LPS datasheet(13/73 Pages) STMICROELECTRONICS

13 / 73 page

Table 14. Crystal oscillator characteristics

Parameter

Test conditions

Min. Typ. Max.

Unit

Crystal frequency

MHz

Frequency tolerance (1)

± 40

ppm

Minimum requirement on external reference phase noise mask

fXO=26 MHz,toavoiddegradationonsynthesizerphase/noise

10 kHz

-135

dBc/Hz

100 kHz

-140

1 MHz

-140

10 MHz

-140

Programmable trans-conductance of the oscillator at start-up

Start-up time (2)

VBAT=1.8 V,

fXO=26 MHz - 100 - µs

1. Including initial tolerance, crystal loading, aging, and temperature dependence. The acceptable crystal tolerance depends

on RF frequency and channel spacing/bandwidth.

2. Start-up times are crystal dependent. The crystal oscillator trans-conductance can be tuned to compensate the variation of

crystal oscillator series resistance.

Table 15. Ultra-low power RC oscillator

Parameter

Test conditions

Typ.

Unit

Calibrated frequency

Calibrated RC oscillator frequency is derived from crystal oscillator

frequency.

33.3 (1) kHz

Frequency accuracy after calibration

±1

1. Depending on the crystal frequency, the reported value is referring to 50 MHz.

3.8

RF receiver

Characteristics measured over recommended operating conditions unless otherwise specified. All typical values

are referred to 25 °C temperature, VBAT = 3.3 V, no frequency offset in the RX signal. The whole performance is

referred to the STEVAL-FKI433V2, STEVAL-FKI512V1 or STEVAL-FKI868V2 with a 50 Ohm antenna connector.

Table 16. RF receiver characteristics

Parameter

Test conditions

HPM/LPMSMPS

on typ.

Unit

Receiver channel bandwidth

CHF

1-800

kHz

RX input return loss

Max. RX gain, tied (RX + TX) matching networks

433 MHz

-15

868 MHz

-15

Saturation 1% BER

2-FSK 1.2 kHz FDEV, DR = 1.2 kbps, CHF = 4 kHz

433 MHz

dBm

868 MHz

Input third order intercept

point

Interferers are continuous wave @ 6 MHz and 12 MHz

offset from carrier

433 MHz

-25

868 MHz

-25

RX noise figure

Max. RX gain, tied (RX + TX) matching networks

433 MHz

868 MHz

Differential input impedance at

LNA

Max. RX gain

R // C

433 MHz

200 // 1.5

Ω//pF

868 MHz

200 // 1.5

S2-LPS

RF receiver

DS13831 - Rev 1

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