ADG918BRMZ

Overview

The ADG918BRMZ is a wideband RF diversity switch manufactured by Analog Devices Inc. using CMOS technology. It operates as an absorptive (matched) SPDT switch with a frequency range of 0 MHz to 4000 MHz. Key electrical parameters include a maximum insertion loss of 1.25 dB and high off-isolation of 43 dB at 1 GHz. The device supports a single power supply voltage between 1.65 V and 2.75 V, with low power consumption under 1 µA. It features CMOS/LVTTL control logic and is housed in an 8-lead MSOP package. The component is rated for operation between -40°C and +85°C.

Feature Summary

• Absorptive topology providing matched impedance characteristics
• Wideband performance extending to 4 GHz with low insertion loss
• High isolation capability ensuring effective signal separation
• Low power consumption suitable for battery-operated systems

Applications

• Wireless communications infrastructure
• Antenna diversity switching systems
• Dual-band application front ends
• Digital transceiver RF switching
• IF switching and tuner modules

Procurement Notes

Verify the specific suffix REEL7 or TR when ordering to confirm tape and reel packaging requirements. Ensure the 8-lead MSOP package matches the PCB footprint design. Confirm that the 1.65 V to 2.75 V supply range aligns with the system voltage rails. Check for RoHS compliance status if required by environmental regulations. Validate lead times with authorized distributors as availability may vary.

Selection Notes

Select this component for applications requiring absorptive switching behavior to minimize reflections. The 50 Ω termination makes it suitable for direct interface with standard RF transmission lines. Consider the 4 GHz bandwidth if higher frequency operation beyond 1 GHz is needed. The low control current simplifies drive circuitry design compared to other RF switches. Ensure the operating temperature range meets the environmental conditions of the final assembly.

Part Context

The ADG918BRMZ belongs to the ADG918/ADG919 family of wideband switches from Analog Devices. While the ADG918 provides absorptive switching with internal 50 Ω terminations, the companion ADG919 offers reflective switching. Both share similar CMOS process technologies and control interfaces. This family targets general-purpose RF switching where size and power efficiency are critical constraints in modern wireless devices.

Replacement Considerations

The ADG918BRMZ-500RL7 is a confirmed substitute part number representing the same component in a different reel quantity configuration. Verify pinout compatibility and electrical specifications before substituting with other SPDT switches. Ensure any alternative maintains the 1.65 V to 2.75 V supply requirement and MSOP package dimensions.