u-blox UBX-G7020, Руководство по интеграции оборудования

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UBX-G7020 - Hardware Integration Manual
Component Selection
GPS.G7-HW-10003 Objective Specification Page 54 of 74
3.15 Inductor for DCDC converter (L2)
ID Parameter Value
1.1 Self resonance frequency (SRF) > 30 MHz
1.2 DC resistance (DCR) < 0.2 Ohm
1.3 Rated current > 0.5 A
1.3 Inductance 1.0…2.2 uH
Table 32: DCDC inductor specifications
It is recommended to use a shielded inductor.
Manufacturer Order No. Comments
muRata LQM2MPN2R2NG0 Low DCR, for best efficiency of DCDC (~85%)
muRata LQM21PN1R0MC0 Low height, 0.5mm
Table 33: Recommend parts list for DCDC inductor
3.16 Standard capacitors
Name Use Figure Type / Value
C1 RF-input DC block Figure 17 COG 47P 5% 25V
C2 RF-input matching network Figure 17 COG 2P7 +/-0.1P 50V
C3 Decoupling VDD_LNA / VDD_ANA Figure 5 X5R 1U0 10% 6.3V
C4 Decoupling LDO_RF_OUT Figure 2 X5R 1U0 10% 6.3V
C5 Decoupling LDO_X_OUT Figure 2 X5R 1U0 10% 6.3V
C6 Decoupling V_CORE (DCDC converter used) Figure 3 X5R 4U7 10% 6.3V
C7 Decoupling V_DCDC_IN Figure 3 X5R 4U7 10% 6.3V
C8 Decoupling VDD_IO Figure 2 X5R 1U0 10% 6.3V
C9 Decoupling V_BCKP Figure 2 X5R 1U0 10% 6.3V
C10 Decoupling LDO_B_OUT Figure 2 X5R 2U2 10% 6.3V
C11 Decoupling V_CORE Figure 2 X5R 1U0 10% 6.3V
C12 Decoupling of USB LDO Figure 21 Depends on USB LDO (U2) specification
C13 Decoupling of USB LDO Figure 21 Depends on USB LDO (U2) specification
C14 Load capacitor at XTAL_O Figure 9 COG 33P 1% 25V
C15 Load capacitor at XTAL_I Figure 9 COG 27P 1% 25V
C16 Decoupling LDO_C_OUT Figure 2 X5R 1U0 10% 6.3V
C17 Bias-T Figure 20 X7R 10N 10% 16V
C18 Decoupling VDD_IO at SQI flash supply pin Figure 2 X5R 1U0 10% 6.3V
Table 34: Standard capacitors
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