4. Board LC Recommended Filters for Noise Reduction in Combined Power Delivery Rails
The part numbers of ferrite bead (FB) and inductances (L) selected in this chapter are the parts which are recommended by Intel® . However, you can select different part numbers as long as the inductance/impedance at certain frequency, resistance, and other parameters of the new parts are similar to recommended FB/L part (similar inductance/impedance and similar to lower resistance within frequency range mentioned in the data sheet of recommended part).
If you are using the recommended switching voltage regulator (LTC7151S), with a proper design from ADI, and meet the simulated 5 mV ripple specification, you do not need to use the LC filter for VCCERT_FGT_GXF, VCCERT1_FHT_GXF, and VCCRT_GXR rails.
|Part MPN||L (nH)||DCR (mΩ)|
You can choose other inductors and ferrite beads, if they meet the specification stated above.
|Part MPN||FF||C (uF)||Voltage Rating (V)||ESR (mΩ)||ESL (pH)|
Choosing the LC Filter based on the DCR Value
DC drop specification must be around 0.5% of the voltage supply. If the voltage rail is 0.9 V, current is 1 A, BLM18SN220TZ1 DCR is 4 mΩ, DC drop = current x DCR = 1 A x 4 mΩ = 4 mV. The 0.5% specification of 0.9 V is 4.5 mV, which is within the specification. For a higher current value, SL1616 is the most suitable as it has lowest DCR.
VCCBAT RC Circuit Using the Device Security AES BBRAM Key
The connection shown below is recommended for the VCCBAT. Connect this pin to a non-volatile battery power source in the range of 1.0V to 1.8V. A series RC (R=10KΩ, C=1µF) circuit must be added to the VCCBAT rail.
P1V8_GR2 ( Intel Agilex® 7 F-Series and I-Series)/P1V8_GR3 ( Intel Agilex® 7 M-Series) Filters Recommendation for Device Fabric
The connections below are recommended for the P1V8_GR2_FLTR voltage rails for the Intel Agilex® 7 F-series and I-series devices or the P1V8_GR3_FLTR voltage rails for the Intel Agilex® 7 M-series devices for noise filtering. The P1V8_GR2_FLTR for the Intel Agilex® 7 F-series and I-series devices or the P1V8_GR3_FLTR for the Intel Agilex® 7 M-series devices consists of VCCADC, VCCPLL_SDM, and VCCPLL_HPS.
P1V2_GR3 Filters Recommendation for Device Fabric
The following figure shows the filter recommendation for VCCA_PLL in 1.2V VCCIO power rail.
P0V8_GR1 Filters Recommendation for Device Fabric
The following figure shows the filter recommendation for the VCCPLLDIG_SDM, VCCPLL_NOC, and VCCPLLDIG_NOC in P0V8_GR1 power rail.
VCCL Filters Recommendation for Device Fabric
The following figure shows the filter recommendation for the VCCPLLDIG_HPS in VCCL power rail.
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