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ADG902BRM Datasheet(PDF) 10 Page - Analog Devices |
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ADG902BRM Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page ADG901/ADG902 Rev. B | Page 10 of 16 APPLICATIONS The ADG901/ADG902 are ideal solutions for low power, high frequency applications. The low insertion loss, high isolation between ports, low distortion, and low current consumption of these parts make them excellent solutions for many high frequency switching applications. Applications include switching between high frequency filters, ASK generators, and FSK generators. ABSORPTIVE vs. REFLECTIVE SWITCHES The ADG901 is an absorptive (matched) switch with 50 Ω terminated shunt legs and the ADG902 is a reflective switch with 0 Ω terminated shunts to ground. The ADG901 absorptive switch has a good VSWR on each port, regardless of the switch mode. An absorptive switch should be used when there is a need for a good VSWR that is looking into the port but not passing the through signal to the common port. The ADG901 is therefore ideal for applications that require minimum reflections back to the RF source. It also ensures that the maximum power is transferred to the load. The ADG902 reflective switch is suitable for applications where high off port VSWR does not matter and the switch has some other desired performance feature. It can be used in many applications, including high speed filter selection. In most cases, an absorptive switch can be used instead of a reflective switch, but not vice versa. |
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