STW81103 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'STW81103' PDF : 53 Pages View PDF
STW81103
9
Application diagram
Figure 36. Typical application diagram
From/to microcontroller
Application diagram
100
100
100
15p
15p
15p
VDD1
1n
22p
10P
RF Out
VDD1
I2C
V DD_V CO A
VDD_DIV2
DBUS_SEL
VDD_BUFVCO
SPI
V DD_O UTB UF
E X TV CO _INP
O UTB UFP
STW81103 EXTVCO_INN
VDD2
1n
22p
10P
VDD1
VDD1
1n
22p
10P
O UTB UFN
VDD_DIV4
V DD_V CO B
VDD_PLL
REF_CLK
TEST2
ref clk
1.8n
51
loop filter
270p
2.2K
8.2K
68p
2.7n
4.7K
1n
VDD1
22p
10µ
to microcontroller
Note: 1 See Section 8: Application information for further information on output matching topology.
2 EXT_PD, ADD2, ADD1 (and ADD0 when the I2C bus is selected) can be hard wired directly
on the board.
3 Loop filter values are for FSTEP = 200 kHz.
4 For best performance VDD1 must be a low noise supply (20 µVRMS in 10 Hz-100 kHz BW).
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