ADG918BRM

Overview

The ADG918BRM is a wideband RF switch from Analog Devices, operating from DC to 4 GHz. It features an absorptive topology with 50-ohm impedance, providing high off-isolation of 43 dB at 1 GHz and low insertion loss of 0.8 dB at 1 GHz. The device supports a single supply voltage range of 1.65 V to 2.75 V and utilizes CMOS/LVTTL control logic. Packaged in an 8-lead MSOP, it consumes less than 1 µA of power. Key electrical parameters include a P1dB of 17 dBm and an IIP3 of 36 dBm.

Feature Summary

• Wideband operation up to 4 GHz with absorptive topology for matched switching
• High isolation performance of 43 dB at 1 GHz combined with low insertion loss
• Low power consumption requiring less than 1 µA current draw
• Compatible with single 1.65 V to 2.75 V supply and CMOS/LVTTL control logic

Applications

• Wireless communications systems
• Antenna diversity switching
• Digital transceiver front-end switching
• IF switching and tuner modules

Procurement Notes

Verify the specific suffix and package variant when sourcing, as the ADG918 series includes different packaging options such as tube or reel configurations. Confirm availability status, as certain variants may be discontinued or subject to long lead times. Ensure the selected part matches the required frequency and isolation specifications for the target application. Cross-reference datasheet revisions to confirm pinout and electrical characteristics remain consistent with design requirements.

Selection Notes

Select the ADG918BRM for applications requiring wideband coverage up to 4 GHz with high isolation. Choose this component over reflective switches when matched absorption is necessary to prevent signal reflections. Verify that the control logic levels align with the system's CMOS or LVTTL outputs. Consider the 8-lead MSOP package for space-constrained designs while ensuring thermal management meets the -40°C to +85°C operating range.

Part Context

The ADG918BRM belongs to the ADG918/ADG919 family of wideband RF switches manufactured by Analog Devices. These devices are designed using a CMOS process to deliver high performance in a compact form factor. The BRM suffix typically denotes the tube packaging option in the 8-lead MSOP format. This family addresses the need for efficient signal routing in modern wireless infrastructure and portable devices.

Replacement Considerations

The ADG918BRMZ is a direct replacement variant available in tape-and-reel packaging. Other family members like the ADG919 offer similar electrical characteristics but may differ in internal topology or configuration. Verify pin compatibility and electrical specs before substituting.