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ADL5565ACPZ-R7 Datasheet(PDF) 23 Page - Analog Devices |
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ADL5565ACPZ-R7 Datasheet(HTML) 23 Page - Analog Devices |
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23 / 28 page  ADL5565 Rev. 0 | Page 23 of 28 SOLDERING INFORMATION On the underside of the chip-scale package, there is an exposed compressed paddle. This paddle is internally connected to the ground of the chip. Solder the paddle to the low impedance ground plane on the PCB to ensure the specified electrical performance and to provide thermal relief. To further reduce thermal impedance, it is recommended that the ground planes on all layers under the paddle be stitched together with vias. EVALUATION BOARD Figure 44 shows the schematic of the ADL5565 evaluation board. The board is powered by a single supply in the 3 V to 5 V range. The power supply is decoupled by 10 μF and 0.1 μF capacitors. Table 15 details the various configuration options of the evaluation board. Figure 45 and Figure 46 show the component and circuit side layouts of the evaluation board. To realize the minimum gain (6 dB into a 200 Ω load), Input 1 (VIN1 and VIP1) must be used by installing 0 Ω resistors at R3 and R4, leaving R5 and R6 open. R1 and R2 must be 33.2 Ω for a 50 Ω input impedance. Likewise, driving Input 2 (VIN2 and VIP2) realizes the middle gain (12 dB into a 200 Ω load) by installing 0 Ω at R5 and R6 and leaving R3 and R4 open. R1 and R2 must be 50 Ω for a 50 Ω input impedance. For the maximum gain (15.5 dB into a 200 Ω load), both inputs are driven by installing 0 Ω resistors at R3, R4, R5, and R6. R1 and R2 are open for a 50 Ω input impedance. The balanced input and output interfaces are converted to single ended with a pair of baluns (M/A-COM ETC1-1-13). The balun at the input, T1, provides a 50 Ω single-ended-to- differential transformation. The output balun, T2, and the matching components are configured to provide a 200 Ω to 50 Ω impedance transformation with an insertion loss of about 11 dB. As an alternative, the input transformer, T1, can be replaced with one of the following transformers to provide a low loss balanced input to the ADL5565. • 6 dB gain configuration, Mini-Circuits TC4-1W+ • 12 dB gain configuration, Mini-Circuits, TC2-1T+ • 15.5 dB gain configuration, Mini-Circuits TC1.5-52T When using these alternative transformers, R1 and R2 are left open. Replace C1 and C2 with 0 Ω jumpers and add a 0.1 μF capacitor to C12. C3 10µF C4 0.1µF C5 0.1µF C6 0.1µF C7 0.1µF C8 0.1µF C13 OPEN C11 0.1µF VPOS R9 34.8Ω R11 OPEN R15 OPEN R14 0Ω J3 R10 34.8Ω R8 84.5Ω C10 0.01µF C9 0.01µF P1 T2 VCOM AGND VPOS GND R7 84.5Ω ENBL J4 OPEN R12 OPEN R13 0Ω J2 OPEN ADL5565 9 10 11 12 4 3 2 1 16 15 14 13 56 78 GND GND GND GND VCC VIN1 VIN2 VIP2 VIP1 VON VCOM ENBL VOP VCC VCC VCC C12 OPEN J1 T1 R1 OPEN R2 OPEN R4 0Ω R3 0Ω R5 0Ω R6 0Ω C1 0.01µF C2 0.01µF Figure 44. Evaluation Board Schematic |
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