JAJSJA1E August 2020 – August 2024 DLPC230S-Q1 , DLPC231S-Q1
PRODUCTION DATA
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The following guidelines are recommended to achieve the desired ASIC performance relative to the internal PLL. The DLPC23xS-Q1 contains two internal PLLs that have dedicated analog supplies (VCC11AD_PLLM, GND11AD_PLLM, VCC11AD_PLLD, GND11AD_PLLD). At a minimum, VCC11AD_PLLx power and GND11AD_PLLx ground pins must be isolated using a simple passive filter consisting of two series ferrites and two shunt capacitors (to widen the spectrum of noise absorption). Recommended values and layout are shown in Table 8-1 and Figure 8-10, respectively.
COMPONENT | PARAMETER | RECOMMENDED VALUE | UNIT |
---|---|---|---|
Shunt Capacitor | Capacitance | 0.1 | µF |
Shunt Capacitor | Capacitance | 1.0 | µF |
Series Ferrite | Impedance at 100 MHz | > 100 | Ω |
DC Resistance | < 0.40 |
Because the PCB layout is critical to PLL performance, it is vital that the quiet ground and power are treated like analog signals. Additional design guidelines are as follows: