S2-LP datasheet(23/90 Pages) STMICROELECTRONICS

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S2-LP

Specifications

DocID029944 Rev 1

23/90

4.8.6

Sensitivity at 920 MHz

Table 23: Sensitivity at 920 MHz

Parameter

Test conditions

SMPS ON

Unit

Sensitivity

1% BER @ 2-GFSK BT

= 0.5

DR = 0.3 kbps, FDEV = 0.25 kHz, CHF = 1 kHz

-128

dBm

DR = 1.2 kbps, FDEV = 1.2 kHz, CHF = 4 kHz

-122

DR = 38.4 kbps, FDEV = 20 kHz, CHF = 100 kHz

-109

DR = 100 kbps, FDEV = 50 kHz, CHF = 200 kHz

-105

Sensitivity

1% BER @ 4-GFSK BT

= 0.5

DR = 4.8 kbps, DEV = 2.4 kHz, CHF = 10 kHz

-114

dBm

DR = 9.6 kbps, DEV = 4.8 kHz, CHF = 20 kHz

-112

DR = 19.2 kbps, DEV = 9.6 kHz, CHF = 40 kHz

-108

Sensitivity

1% BER @ OOK

DR = 0.3 kbps, CHF = 1 kHz

-121

dBm

DR = 1.2 kbps, CHF = 4 kHz

-118

DR = 38.4 kbps, CHF = 100 kHz

-105

DR = 125 kbps, CHF = 250 kHz

-100

4.9

RF transmitter

Characteristics measured over recommended operating conditions unless otherwise

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

performance is referred to a 50 Ω antenna connector, via the reference design.

Table 24: RF transmitter characteristics

Parameter

Test conditions

Typ.

Unit

Maximum output power

CW @ antenna level

dBm

Maximum output power in boost mode

CW @ antenna level

Minimum output power

CW @ antenna level

-30

Output power step

0.5

Table 25: PA impedance

Parameter

Test conditions

Typ.

Unit

Optimum load impedance

433 MHz

56+25j

Ω

868 MHz

30+24j

920 MHz

29+23j

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