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CN-0140 Datasheet(PDF) 3 Page - Analog Devices |
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CN-0140 Datasheet(HTML) 3 Page - Analog Devices |
3 / 4 page Circuit Note CN-0140 Rev. 0 | Page 3 of 4 Figure 2. Measured Single-Tone Performance of the Circuit in Figure 1 for a 1950 MHz RF Input Signal. Sampling Frequency = 122.88 MSPS, IF Input = 153.6 MHz COMMON VARIATIONS Front-end LNAs and attenuators are not included in this circuit but can easily be interfaced to the 50 Ω single-ended RF inputs of the ADL5356 mixer. For a complete receiver design, ADL5521/ADL5523 LNAs may be incorporated. The standard configuration using the ADL5356 allows reception of RF signals from 1.2 GHz to 2.4 GHz, but it is possible to use the ADL5358 mixer, which covers RF input frequencies from 500 MHz to 1700 MHz. An Epcos (www.epcos.com) SAW filter follows the mixer and provides the necessary channel selectivity over a bandwidth ranging from 20 MHz to 40 MHz, depending on the chosen filter. The circuit shown uses a 20 MHz bandwidth, 153.6 MHz centered SAW filter (part number: B5206) but can also accommodate other pin-compatible filters. Some empirical optimization may be needed to help compensate for actual PCB parasitics in SAW filter matching and antialias filter implementation. Details of designing the interstage filters can be found in the AN-742 and AN-827 application notes. To ensure repeatability of band response, 1% capacitors are recommended for the SAW filter matching components and the antialiasing filter. In addition, Coilcraft 0603CS or similar inductors are recommended. Other resistors, capacitors, and inductors can be 10% values. Excellent layout, grounding, and decoupling techniques must be utilized in order to achieve the desired performance from the circuits discussed in this note. As a minimum, a 4-layer PCB should be used with one ground plane layer, one power plane layer, and two signal layers. All IC power pins must be decoupled to the ground plane with low inductance multilayer ceramic capacitors (MLCC) of 0.01 μF to 0.1 μF (for simplicity, not shown in the diagrams). Follow the recommendations on the individual data sheets and in Tutorial MT-101. The product evaluation boards should be consulted for recommended layout and critical component placement. These can be accessed through the product pages for the devices. Even though the AD8376 and AD9258 (or other ADC) may be powered from different supplies, sequencing is not an issue because the input signal to the ADC is ac-coupled. The individual data sheet for the ADC should be consulted regarding the proper sequencing of the AVDD and the DVDD power supplies (if separate supplies are used). |
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