Pll Power Supply Pins; Recommended Configuration Of Filter - Renesas R-IN32M4-CL2 User Manual

R-IN32M4-CL2 User's Manual: Board design edition
4.

PLL Power Supply Pins

The PLL circuit is susceptible to noise. To reduce the influence of noise, it is recommended to place filters in the power
supply pins of the PLL. In addition, to reduce the effects of noise between the power supplies for the board and PLL, the
use of ferrite beads is recommended.
4.1

Recommended Configuration of Filter

Figure 4.1 shows the recommended configuration of the filter for the PLL power supply pins.
VDD10 (1.0 V)
C1: 0.1-µF ceramic capacitor
C2: ≥ 4.7-µF capacitor
FB: Impedance: 600Ω at 100 MHz / DC resistance component: 0.3Ω or below
Reference ferrite beads: TDK MPZ2012S601A, MPZ1608S601A
Figure 4.1 Recommended Configuration of Filter
Caution: Place C1 immediately close to R-IN32M4-CL2.
If C2 is not placed immediately close to R-IN32M4-CL2, this will not cause any problems.
R18UZ0046EJ0200
Dec. 28, 2018
FB
C2
FB
R-IN32M4-CL2
PLL_VDD
PLL
C1
PLL_GND
4. PLL Power Supply Pins
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