Analog Devices Inc. ADG918BRM-500RL7

Overview

ADG918BRM-500RL7 from Analog Devices is an absorptive 2:1 RF SPDT switch IC designed for high-isolation signal routing in wireless front ends. It delivers 43 dB off-isolation at 1 GHz, 0.8 dB insertion loss at 1 GHz, and operates from a single 1.65 V to 2.75 V CMOS supply. Its matched 50 Ω shunt legs enable low-reflection switching in antenna diversity and transceiver T/R paths.

For engineers reviewing the ADG918BRM-500RL7 datasheet, ADG918BRM-500RL7 pinout, ADG918BRM-500RL7 application, or ADG918BRM-500RL7 equivalent, key selection criteria include absorptive port matching, sub-10 ns switching times, −40°C to +85°C industrial temperature range, and MSOP-8 package compatibility with 50 Ω RF layout constraints.

Technical Context

The ADG918BRM-500RL7 implements an absorptive (matched) RF switch architecture with internally terminated 50 Ω shunt legs on RF1 and RF2, ensuring stable VSWR regardless of switch state. Its on-board CMOS/LVTTL-compatible control logic eliminates external level-shifting circuitry.

It supports DC–4 GHz operation with −3 dB bandwidth, maintains <1 μA quiescent current, and achieves 28.5 dBm IP3 at 900 MHz - enabling use in low-power, high-linearity digital transceiver front ends without external bias networks or matching components.

Key Specifications

Pinout & Package

ADG918BRM-500RL7 uses an 8-lead Mini Small Outline Package (MSOP, RM-8) with exposed thermal pad tied to GND. The package supports standard reflow profiles and requires decoupling capacitance on VDD.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF SPDT switch applications.

Compared with ADG919BRM-500RL7 and QM11036, ADG918BRM-500RL7 uniquely balances ultra-low voltage operation (1.65 V), absorptive matching, and industrial temperature range in a compact MSOP - making it optimal for space-constrained, battery-sensitive, and reflection-critical RF routing where 43 dB isolation and <1 μA quiescent current are mandatory.

Availability

ADG918BRM-500RL7 is available at Aetrix Electronics and suitable for wireless metering, antenna diversity systems, and digital transceiver front ends requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for ADG918BRM-500RL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and RF ICs, serving precision instrumentation, communications, and industrial markets since 1965.

The ADG9xx product line delivers wideband, low-distortion RF switches optimized for wireless infrastructure, consumer tuners, and IoT connectivity - with the ADG918BRM-500RL7 specifically engineered for absorptive, low-voltage, high-isolation signal routing in compact portable devices.

FAQ

What is the maximum RF input power the ADG918BRM-500RL7 can handle before compression?

The ADG918BRM-500RL7 has a P−1 dB of 17 dBm at 1000 MHz, meaning its insertion loss increases by 1 dB when the RF input power reaches +17 dBm. This value is measured under typical conditions (VDD = 2.5 V, TA = 25°C) and remains ≥16 dBm across the full −40°C to +85°C operating range. Engineers should verify headroom against system-level peak-to-average power ratios when deploying ADG918BRM-500RL7 in burst-mode transmitters.

Does the ADG918BRM-500RL7 require external matching components for 50 Ω operation?

No, the ADG918BRM-500RL7 does not require external matching components. Its absorptive architecture integrates 50 Ω shunt terminations on RF1 and RF2 ports, delivering 22 dB return loss on the active channel and 16–20 dB on the off channel at 1 GHz. This internal matching eliminates discrete baluns, capacitors, or resistors typically needed with reflective switches - simplifying PCB layout and reducing bill-of-materials cost for ADG918BRM-500RL7 implementations.

Can the ADG918BRM-500RL7 operate from a 1.8 V supply, and how does that affect RF performance?

Yes, the ADG918BRM-500RL7 is fully specified for 1.65 V to 2.75 V operation, including 1.8 V. At 1.8 V, insertion loss increases by ≤0.1 dB versus 2.5 V (e.g., 0.9 dB vs. 0.8 dB @ 1 GHz), isolation degrades by ≤2 dB (41 dB vs. 43 dB @ 1 GHz), and switching times remain within spec (tON ≤ 10 ns). This makes ADG918BRM-500RL7 ideal for 1.8 V SoC interfaces without level translation, preserving RF integrity in low-voltage IoT designs.

How is the exposed thermal pad on the ADG918BRM-500RL7 MSOP package intended to be connected?

Per Analog Devices' RM-8 package drawing, the exposed thermal pad on the ADG918BRM-500RL7 is internally connected to substrate and GND. It must be soldered directly to a low-impedance PCB ground plane using a thermally robust stencil pattern (≥60% copper fill) to ensure mechanical reliability and optimal RF grounding. Failure to connect this pad degrades thermal resistance (θJA rises from 206°C/W to >300°C/W) and compromises isolation and return loss performance in ADG918BRM-500RL7 layouts.

Is the ADG918BRM-500RL7 pin-compatible with other members of the ADG918/ADG919 family?

Yes, the ADG918BRM-500RL7 shares identical pinout and footprint with all ADG918 and ADG919 variants in the RM-8 (MSOP) package, including ADG918BRM, ADG919BRM, and their RoHS-compliant Z-versions. This allows direct substitution within the same package variant - though functional differences exist (e.g., ADG919 is reflective), so schematic and layout validation is required before swapping ADG918BRM-500RL7 for ADG919BRM-500RL7 in absorptive-critical applications.