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ILC7082AIM545X Datasheet(PDF) 10 Page - Fairchild Semiconductor |
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ILC7082AIM545X Datasheet(HTML) 10 Page - Fairchild Semiconductor |
10 / 16 page ILC7082 10 REV. 1.6.2 11/17/04 Table 2. Evaluation Board Parts List For Printed Circuit Board Shown in Figure 9 Grounding Recommendations 1. Connect CIN between VIN of the ILC7082 and the “GROUND PLANE”. 2. Keep the ground side of COUT and CNOISE connected to the “LOCAL GROUND” and not directly to the “GROUND PLANE”. 3. On multilayer boards use component side copper for grounding around the ILC7082 and connect back to a “GROUND PLANE” using vias. 4. If using a DC-DC converter in your design, use a star grounding system with separate traces for the power ground and the control signals. The star should radiate from where the power supply enters the PCB. Layout Considerations 1. Place all RF LDO related components; ILC7082, input capacitor CIN, noise bypass capacitor CNOISE and output capacitor COUT as close together as possible. 2. Keep the output capacitor COUT as close to the ILC7082 as possible with very short traces to the VOUT and GND pins. 3. The traces for the related components; ILC7082, input capacitor CIN, noise bypass capacitor CNOISE and output capacitor COUT can be run with minimum trace widths close to the LDO. 4. Maintain a separate “LOCAL GROUND” remote from the “GROUND PLANE” to ensure a quiet ground near the LDO. Figure 9 shows how this circuit can be translated into a PCB layout. Label Part Number Manufacturer Description U1 ILC7082AIM5-30 Fairchild Semiconductor 150mA RF LDO™ regulator J1 69190-405 Berg Connector, four position header Cin GRM40 Y5V 105Z16 muRata Ceramic capacitor, 1 µF, 16V, SMT ( size 0805 ) Cnoise ECU-V1H103KBV Panasonic Ceramic capacitor, 0.01 µF, 16V, SMT ( size 0603 ) Cout GRM42-6X7R105K016 muRata Ceramic capacitor, 1 µF, 16V, SMT ( size 1206) |
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