Analog Devices ADG901BCPZ | Demoboard EVAL-CN0551-EBZ

Description

The RF signal of the CN0551 is first passed through a surface acoustic wave (SAW) filter before going through the gain stages, which helps eliminate unwanted out-of-band amplification. When selecting a filter, a balance must be struck between the band flatness and the out-of-band rejection. SAW filters are also a source of insertion loss, which reduces the overall gain of the signal chain and needs to be considered during selection.In this reference design, the SAW filter used has a typical maximum insertion loss of 2 dB and a terminating impedance of 50 Ω.The CN0551 uses two amplifier stages in its RF signal path. The first stage is an AD8353 RF gain block amplifier that provides a fixed gain of 19.6 dB (Typical) in the 433.92 MHz ISM band. The AD8353 is capable of operating from 1 MHz to 2.7 GHz, and exhibits a return loss of greater than 10 dB over this entire frequency range.The RF pins of the AD8353 are internally matched to 50 Ω, allowing it to be integrated directly into standard RF signal paths without external matching networks. As shown in Figure 2, only dc blocking capacitors on the RF pins and bypass capacitors on the supply pins are required for proper operation of the AD8353. Table 1 shows the recommended values for these capacitors.

Features

• +35 dB Gain
• 433 MHz ISM Band Optimized
• 50 Ohm Input and Output Impedance Matched
• Over temperature Monitoring
• Automatic Thermal Shutoff & Turn on

Typical applications

• Battery Powered System
• Industrial Equipment
• Medical
• Telecom, Datacom (Optical Modules)

More information

• Datasheet
• IC product information