SI4020 查看數據表（PDF） - Silicon Laboratories

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SI4020

Universal ISM Band FSK Transmitter

Silicon Laboratories 

Si4020

AC Characteristics

Symbol

fref

Parameter

PLL reference frequency

fo

Output frequency (programmable)

tlock

PLL lock time

tsp

PLL startup time

Conditions/Notes

Min

Typ

Max Units

Crystal operation mode is parallel (Note 2)

8

10

12

MHz

315 MHz band, 2.5 kHz resolution

310.24

319.75

433 MHz band, 2.5 kHz resolution

868 MHz band, 5.0 kHz resolution

430.24

860.48

439.75

879.51

MHz

915 MHz band, 7.5 kHz resolution

900.72

929.27

Frequency error < 10 kHz after 10 MHz

step

20

µs

After turning on from idle mode, with

crystal oscillator already stable

250

µs

IOUT

Open collector output current (Note 3) At all bands

0.1

2.5

mA

PmaxL

PmaxH

Pout

Psp

Co

Qo

Lout

BRFSK

BROOK

dffsk

Cxl

tPOR

tsx

Available output power

(315 and 433 MHz band)

Available output power

(868 and 915 MHz band)

Typical output power

Spurious emission

Output capacitance (set by the

automatic antenna tuning circuit)

Quality factor of the output

capacitance

Output phase noise

FSK bit rate

OOK bit rate

FSK frequency deviation

Crystal load capacitance

See Crystal Selection Guidelines

Internal POR timeout

(Note 6)

Crystal oscillator startup time

tPBt

Wake-up timer clock accuracy

twake-up

Cin, D

tr, f

Programmable wake-up time

Digital input capacitance

Digital output rise/fall time

All notes for table above are on page 7.

With optimal antenna impedance

(Note 4)

With optimal antenna impedance

(Note 4)

Selectable in 3 dB steps (Note3)

At max power with loop antenna

(Note 5)

At low bands

At high bands

100 kHz from carrier

1 MHz from carrier

Programmable in 30 kHz steps

Programmable in 0.5 pF steps, tolerance

+/- 10%

After Vdd has reached 90% of final value

Crystal ESR < 100 Ohms (Note 7)

Crystal oscillator must be enabled to

ensure proper calibration at startup

(Note 7)

15 pF pure capacitive load

3

dBm

1

Pmax-21

1.5

2.3

1.6

2.2

16

18

-75

-85

30

8.5

dBm

Pmax

dBm

-50

dBc

3.1

pF

2.8

22

dBc/Hz

256

kbps

512

kbps

240

kHz

16

pF

100

ms

1

5

ms

+/-10%

ms

1

2 · 109

ms

2

pF

10

ns

8

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