Silicon Laboratories SI4421 Si4421, AC Characteristics Transmitter, AC Characteristics Others

Page 11
Si4421

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Si4421

 

AC Characteristics (Transmitter)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Symbol

 

Parameter

 

Conditions/Notes

 

Min

Typ

Max

 

 

 

Units

 

 

 

IOUT

 

Open collector output DC current

Programmable

0.5

 

 

 

6

 

 

 

mA

 

 

 

Pmax_50

 

Max. output power delivered to 50

 

In 433 MHz band

 

 

7

 

 

 

 

 

dBm

 

 

 

 

Ohm load over a suitable matching

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In 868 MHz / 915 MHz bands

 

 

5

 

 

 

 

 

 

 

 

 

network (Note 4)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Max. EIRP with suitable selected

 

In 433 MHz band with monopole antenna

 

 

7

 

 

 

 

 

 

 

 

 

Pmax_ant

 

 

with matching network (Note 4)

 

 

 

 

 

 

 

dBm

 

 

 

 

PCB antenna (Note 6)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

In 868 MHz / 915 MHz bands (Note 5)

 

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pout

 

Typical output power

Selectable in 2.5 dB steps (Note 7)

Pmax -17.5

 

 

Pmax

 

 

 

dBm

 

 

 

Psp

 

Spurious emission

 

At max power 50 Ohm load (Note 4)

 

 

 

 

-55

 

 

 

dBc

 

 

 

 

l f-fspl > 1 MHz

 

With PCB antenna (Note 5)

 

 

 

 

-60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pharm

 

Harmonic suppression

 

At max power 50 Ohm load (Note 4)

 

 

 

 

-35

 

 

 

dBc

 

 

 

 

 

With PCB antenna (Note 5)

 

 

 

 

-42

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Co

 

Output capacitance (set by the

 

In 433 MHz band

2

 

2.6

 

3.2

 

 

 

pF

 

 

 

 

automatic antenna tuning circuit)

 

In 868 MHz / 915 MHz bands

2.1

 

2.7

 

3.3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Qo

 

Quality factor of the output

 

In 433 MHz band

13

 

15

 

17

 

 

 

 

 

 

 

 

capacitance

 

In 868 MHz / 915 MHz bands

8

 

10

 

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lout

 

Output phase noise

 

100 kHz from carrier, in 868 MHz band

 

 

-80

 

 

 

 

dBc/Hz

 

 

 

 

 

1 MHz from carrier, in 868 MHz band

 

 

-103

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

BRTX

 

FSK bit rate

 

Via internal TX data register

 

 

 

 

172

 

 

 

kbps

 

 

 

BRATX

 

FSK bit rate

 

TX data connected to the FSK input

 

 

 

 

256

 

 

 

kbps

 

 

 

dffsk

 

FSK frequency deviation

 

Programmable in 15 kHz steps

15

 

 

 

240

 

 

 

kHz

 

AC Characteristics (Turn-on/Turnaround timings)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Symbol

 

 

Parameter

 

Conditions/Notes

 

Min

 

Typ

 

Max

 

 

 

Units

 

 

 

tsx

 

 

Crystal oscillator startup time

 

Default capacitance bank setting, crystal

 

 

2

 

7

 

 

 

ms

 

 

 

 

 

 

ESR < 50 Ohm (Note 9). Crystal load

 

 

 

 

 

 

 

 

 

 

 

 

 

 

capacitance = 16 pF.

 

 

 

 

 

 

 

 

 

 

 

 

Ttx_XTAL_ON

 

 

Transmitter turn-on time

 

Synthesizer off, crystal oscillator on with

 

 

250

 

 

 

 

 

µs

 

 

 

 

 

 

10 MHz step

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Trx_XTAL_ON

 

 

Receiver turn-on time

 

Synthesizer off, crystal oscillator on with

 

 

250

 

 

 

 

 

µs

 

 

 

 

 

 

10 MHz step

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ttx_rx_SYNT_ON

 

 

Transmitter – Receiver turnover time

 

Synthesizer and crystal oscillator on

 

 

150

 

 

 

 

 

µs

 

 

 

 

 

 

during TX/RX change with 10 MHz step

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Trx_tx_SYNT_ON

 

 

Receiver – Transmitter turnover time

 

Synthesizer and crystal oscillator on

 

 

150

 

 

 

 

 

µs

 

 

 

 

 

 

during RX/TX change with 10 MHz step

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AC Characteristics (Others)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Symbol

 

Parameter

 

Conditions/Notes

 

Min

 

Typ

 

Max

 

 

 

Units

 

 

 

Cxl

 

Crystal load capacitance,

 

Programmable in 0.5 pF steps, tolerance

8.5

 

 

 

16

 

 

 

pF

 

 

 

 

see crystal selection guide

± 10%

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

tPOR

 

Internal POR timeout

 

After Vdd has reached 90% of final value

 

 

 

 

100

 

 

 

ms

 

 

 

 

 

(Note 8)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Crystal oscillator must be enabled to

 

 

 

 

 

 

 

 

 

 

 

 

tPBt

 

Wake-up timer clock accuracy

 

ensure proper calibration at the start up.

 

 

± 10

 

 

 

%

 

 

 

 

 

 

 

 

(Note 9)

 

 

 

 

 

 

 

 

 

 

 

 

CinD

 

Digital input capacitance

 

 

 

 

 

 

 

2

 

 

 

pF

 

 

 

tr , tf

 

Digital output rise/fall time

15 pF pure capacitive load

 

 

 

 

10

 

 

 

ns

 

Notes are on page 12.

11

Page 10 Page 12
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Page 10 Page 12
Contents TYPICAL APPLICATIONS FUNCTIONAL BLOCK DIAGRAMFEATURES DESCRIPTIONSi4421 DETAILED FEATURE-LEVELDESCRIPTIONRF Power Amplifier PA Data Filtering and Clock RecoveryCrystal Oscillator Low Battery Voltage DetectorWake-UpTimer Data Validity BlocksFunction Si4421 PACKAGE PIN DEFINITIONSName TypeInternal connection Si4421Internal Pin Connections NameSi4421 PIN6 Logic Diagram FSK / DATA / nFFSPIN10 Logic Diagram nRES I/O Note These pins can be left floatingPin Function vs. Operation Mode Si4421Typical Application Recommended supply decoupling capacitor valuesRecommended Operating Range Si4421 GENERAL DEVICE SPECIFICATIONSAbsolute Maximum Ratings non-operating Si4421 ELECTRICAL SPECIFICATIONDC Characteristics Si4421 AC Characteristics PLL parametersAC Characteristics Receiver AC Characteristics Others Si4421AC Characteristics Transmitter AC Characteristics Turn-on/TurnaroundtimingsNote 10 By design Si4421Timing Diagram Si4421 CONTROL INTERFACETiming Specification Si4421 Control CommandsControl Register Default Values Si4421 Description of the Control CommandsConfiguration Setting Command 2. Power Management CommandSi4421 Logic connections between power control bitsSi4421 Frequency Setting Command4. Data Rate Command 5. Receiver Control CommandSi4421 VDI Logic DiagramSi4421 6. Data Filter CommandSi4421 7.FIFO and Reset Mode CommandSi4421 8. Synchron Pattern Command9. Receiver FIFO Read Command 10. AFC CommandBit 5-4rl1 to rl0 Si4421Si4421 11. TX Configuration Control CommandFrequency Setting Command Si4421 13. Transmitter Register Write Command12. PLL Setting Command Si4421 14. Wake-UpTimer Command15.Low Duty-CycleCommand Si4421 Vlb= 2.25 + V · 0.1 V Clock divider configurationBit Name 17. Status Read CommandSi4421 Si4421 INTERRUPT HANDLING Si4421 TX REGISTER BUFFERED DATA TRANSMISSIONTypical TX register usage Si4421RECOMMENDED PACKET STRUCTURES Si4421 RX FIFO BUFFERED DATA READBit Rate 38.4 kbps Si4421 CRYSTAL SELECTION GUIDELINESBit Rate 2.4 kbps Bit Rate 9.6 kbpsSi4421 RX-TXALIGNMENT PROCEDURES Si4421 RESET MODES Si4421 Sensitive Reset Enabled, Ripple on VddFIFO and Reset Mode Command page SW Reset CommandChannel Selectivity and Blocking Si4421 TYPICAL PERFORMANCE CHARACTERISTICSBER Curves in 868 MHz Band Si4421BER Curves in 433 MHz Band 434 MHz Si4421Frequency Dependent Component Values Si4421 REFERENCE DESIGNSSchematics Evaluation Board with 50 Ohm Matching NetworkPCB Layout Top View Bottom View Si4421Frequency Dependent Component Values SchematicsSi4421 Evaluation Board with Resonant PCB Antenna BIFATop View Bottom View Si4421PCB Layout Antenna designed for 868/915 MHz band See Detail “A” Section B-B Si4421 PACKAGE INFORMATION16-pinTSSOP Related Resources RELATED PRODUCTS AND DOCUMENTSSi4421 Universal ISM Band FSK Transceiver Demo Boards and Development KitsSi4421
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