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LM3279 Datasheet(PDF) 29 Page - Texas Instruments |
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LM3279 Datasheet(HTML) 29 Page - Texas Instruments |
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29 / 37 page  L GPO 1 FB VIO EN SCLK GPO0 SVIN PVIN VCON SDATA PGND VOUT C1 C3 C4 FB C2 SW2 SW1 SGND GND 1.5 ÛH PVIN SVIN EN SGND PGND SW1 SW2 LM3279 VOUT FB VCON VOUT: 0.4V to 4.2V 10 ÛF 10 ÛF VBATT: 2.7V to 5.5V GPO0 GPO1 BB or RFIC VIO SDATA SCLK DGND RF Control Bits RF PA(s) 2 x 0.47 ÛF (PA decoupling caps) LM3279 www.ti.com SNVS970C – MARCH 2013 – REVISED OCTOBER 2014 Layout Examples (continued) 10.2.1 LM3279 RF Evaluation Board Figure 32. Simplified LM3279 RF Evaluation Board Schematic 1. Input Capacitor C2 should be placed closer to LM3279 than C1. 2. Optional to add a 100 nF (C1) on input of LM3279 for high frequency filtering. 3. Bulk Output Capacitor C3 should be placed closer to LM3279 than C4. 4. Optional to add a 100 nF (C4) on output of LM3279 for high frequency filtering. 5. Connect both GND terminals of C1 and C4 directly to System RF GND layer of phone board. 6. Connect bumps SGND (C3) and GND (D1) directly to System GND. 7. TI has seen improvement in high frequency filtering for small bypass caps (C1 and C4) when they are connected to System GND instead of same ground as PGND. These capacitors should be 0201 (0603 metric) case size for minimum footprint and best high frequency characteristics. 10.2.2 Component Placement Figure 33. LM3279 Recommended Parts Placement (Top View) Copyright © 2013–2014, Texas Instruments Incorporated Submit Documentation Feedback 29 Product Folder Links: LM3279 |
Similar Part No. - LM3279_15 |
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Similar Description - LM3279_15 |
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