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ADG904BRU-500RL7 Datasheet(PDF) 11 Page - Analog Devices |
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ADG904BRU-500RL7 Datasheet(HTML) 11 Page - Analog Devices |
11 / 16 page ADG904/ADG904-R Rev. 0 | Page 11 of 16 APPLICATIONS The ADG904/ADG904-R 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. They may be used in applications such as switchable filters, transmitters and receivers for radar systems, and communication systems from base stations to cell phones. The ADG9xx wideband switches are designed to meet the demands of devices transmitting at ISM band frequencies to 1 GHz and higher. The low insertion loss, high isolation between ports, single pin control interface, no requirement for dc blocking capacitors, and TTL interface compatibility make them cost effective and easy to integrate switching solutions for many high frequency switching applications and low power applications where the parts can handle up to 16 dBm of power. ABSORPTIVE VS. REFLECTIVE The ADG904 is an absorptive (matched) switch with 50 Ω terminated shunt legs; the ADG904-R is a reflective switch with 0 Ω terminated shunts to ground. The ADG904 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 ADG904 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 ADG904-R 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. ANTENNA DIVERSITY SWITCH The ADG904 is ideal for use as an antenna diversity switch, switching in different antennas to the tuner. The low insertion loss ensures minimum signal loss and high isolation between channels, making these SP4T switches suitable for switching applications in tuner modules and set-top boxes. TUNER ADG904 CABLE RF1 RF2 RF3 RF4 VGA ANTENNA Figure 26. Tuner Modules FILTER SELECTION The ADG904 can be used to switch high frequency signals between different filters, and to multiplex the signal to the output. These SP4T switches are also ideal for high speed signal routing. RFOUT RFC ADG904 ADG904 RF1 RF2 RF3 RF4 RF1 RF2 RF3 RF4 RFIN RFC Figure 27. Filter Selection Tx/Rx SWITCHING The low insertion loss and high isolation between ports ensures that the ADG904/ADG904-R is a suitable transmit/receive switch for all ISM band and WirelessLAN, providing the required isolation between the transmit and receive signals. ADG904 Tx Rx Rx Rx Rx ANTENNA Figure 28. Tx/Rx Switching |
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