DLPS201E August 2020 – August 2024 DLPC230S-Q1 , DLPC231S-Q1
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
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: