SI4438 Datasheet, PDF (2/44 Pages) Silicon Laboratories – Low active power consumption

Si4438
Functional Block Diagram
SDN
RXP
RXN
GPIO3 GPIO2
VCO
Loop
Filter
FBDIV
TX DIV
LO
Gen
RF
PKDET
LNA
TX
PA
PowerRamp
Cntl
PA
LDO
XIN XOUT
PFD / CP
Frac-N Div
30 MHz XO
Bootup
OSC
IF
PKDET
PGA
ADC
MODEM
FIFO
Packet
Handler
LDOs
POR
LBD
32K LP
OSC
Digital
Logic
nSEL
SDI
SDO
SCLK
nIRQ
VDD TXRAMP
VDD
GPIO0 GPIO1
Product
Si4438
Freq. Range
425–525 MHz
Max Output
Power
+20 dBm
TX Current
75 mA
RX Current
14 mA
2
Rev 1.0