STM32W108B-SK STMicroelectronics, STM32W108B-SK Datasheet - Page 7

• Manufacturer Part Number: STM32W108B-SK
• Description: STARTER KIT FOR STM32W108
• Manufacturer: STMicroelectronics
• Series: STM32r
• Type: MCUr

Specifications of STM32W108B-SK

• Featured Product: STM32 Cortex-M3 Companion Products
• Contents: Board
• Silicon Manufacturer: ST Micro
• Core Architecture: ARM
• Core Sub-architecture: Cortex - M3
• Silicon Core Number: STM32
• Silicon Family Name: STM32W108xx
• Kit Contents: Board
• Features: IEEE
• Mfg Application Notes: STM32W108 Adjacent Channel Rejection Measurements
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: *
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

AN3206
Figure 3.
Figure 4
routes between the STM32W and the balun. ST recommends the use of an 0603 inductor to
allow ample space for the traces to go to the balun first with deterministic lengths. Trace
inductance between the inductor and balun is then absorbed into the total shunt inductance,
so it may be predictably offset by reducing the physical component value. The tuned value
on the reference design came out to be 3.3 nH.
Figure 4.
The PCB designer has the option to route the traces to the inductor first and the balun
second, but this has the effect of moving the components further away from the STM32W.
shows a PCB layout (layer 1). It is important that the PCB designer notice the
STM32W Ceramic Balun matching network
Layer 1 except showing the balun routes
Doc ID 17406 Rev 3
Reference design
7/14