Analog Devices Inc. ADG902BRM-REEL7

Overview

ADG902BRM-REEL7 from Analog Devices is a reflective single-pole single-throw (SPST) RF switch optimized for 0 Hz to 4.5 GHz operation, delivering 40 dB off isolation at 1 GHz, 0.8 dB insertion loss at 1 GHz, and 17 dBm P1dB compression point - enabling high-fidelity signal routing in antenna diversity and tuner modules without DC blocking capacitors.

For engineers reviewing the ADG902BRM-REEL7 datasheet, ADG902BRM-REEL7 pinout, ADG902BRM-REEL7 application, or ADG902BRM-REEL7 equivalent, key selection criteria include reflective termination behavior, 1.65 V–2.75 V CMOS/LVTTL control compatibility, sub-10 ns switching times, and LFCSP/MSOP package options with exposed pad grounding requirements.

Technical Context

The ADG902BRM-REEL7 implements a reflective SPST architecture with 0 Ω shunt-to-ground termination on the off port, distinguishing it from the absorptive ADG901. Its CMOS-based RF switch core operates without external biasing and supports DC-coupled signals up to 0.5 V, eliminating need for series DC-blocking capacitors in baseband or IF paths.

Control logic accepts CMOS/LVTTL inputs across 1.65 V–2.75 V supply range, with <1 µA quiescent current and 3.6 ns typical turn-on time. Performance is specified over −40°C to +85°C, with isolation and insertion loss validated up to 4.5 GHz (−3 dB frequency), and third-order intercept (IP3) of 36 dBm at 900 MHz.

Key Specifications

Pinout & Package

ADG902BRM-REEL7 is packaged in an 8-lead Mini Small Outline Package (MSOP, RM-8) with 3 mm × 3 mm footprint and exposed thermal pad requiring PCB ground connection. Pin 1 is marked by a dot; the exposed pad must be soldered to a solid GND plane for thermal and RF performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar RF SPST switching applications.

Compared with ADG902BRM-REEL7, ADG901BRMZ-REEL7 provides superior off-port matching at the cost of higher on-path capacitance and slightly reduced bandwidth, while SKY13370-374LF offers higher-frequency SPDT routing but sacrifices DC coupling and requires higher supply voltage - making ADG902BRM-REEL7 uniquely balanced for DC-to-4.5 GHz reflective SPST needs in space-constrained, low-voltage designs.

Availability

ADG902BRM-REEL7 is available at Aetrix Electronics and suitable for antenna diversity switching, dual-band tuner modules, IF signal routing, and high-speed filter bank selection requiring stable component supply across industrial and wireless infrastructure programs.

Supply support for ADG902BRM-REEL7 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 ADG902BRM-REEL7 belongs to Analog Devices' wideband RF switch product line, engineered specifically for DC-coupled, low-distortion signal routing in wireless infrastructure, portable radios, and reconfigurable front ends.

FAQ

What is the maximum DC voltage that can pass through ADG902BRM-REEL7 without damage or performance degradation?

The ADG902BRM-REEL7 supports DC-coupled operation up to 0.5 V at RF1 and RF2 ports without requiring blocking capacitors. Exceeding this voltage risks forward-biasing internal diodes and degrading isolation or causing permanent damage. Absolute maximum ratings specify RF port voltage limits as −0.5 V to VDD – 0.5 V, so at VDD = 2.75 V, the safe DC range remains −0.5 V to +2.25 V - but functional DC coupling is only guaranteed ≤0.5 V per the datasheet's "enables user to pass dc signals up to 0.5 V" specification. ADG902BRM-REEL7 must not be used for higher DC bias unless externally protected.

Does ADG902BRM-REEL7 require external termination resistors on the RF ports?

No, ADG902BRM-REEL7 does not require external termination resistors on RF1 or RF2. As a reflective switch, it internally terminates the off port to 0 Ω (ground), and the on port presents a 50 Ω match. External 50 Ω terminations are only needed if driving mismatched loads or measuring isolation/return loss in test setups. The device's RF ports are designed for direct 50 Ω system integration, and adding external resistors would degrade insertion loss and alter S-parameters. ADG902BRM-REEL7's pinout and layout guidelines assume direct microstrip or coplanar waveguide connection without added termination.

Can ADG902BRM-REEL7 be operated from a 3.3 V supply?

No, ADG902BRM-REEL7 is not rated for 3.3 V operation. Its absolute maximum VDD rating is +4 V, but the functional supply range is strictly 1.65 V to 2.75 V per the datasheet's "Specifications" table and "Power Requirements" section. Operating at 3.3 V exceeds the maximum recommended supply and may cause excessive current draw, latch-up, or accelerated parametric drift. For 3.3 V systems, level-shifting the CTRL signal and using a dedicated 2.5 V LDO for ADG902BRM-REEL7 is required. ADG902BRM-REEL7's internal CMOS switch core and control logic are optimized for sub-2.75 V rails only.

How does the exposed pad on the ADG902BRM-REEL7 MSOP package affect thermal and RF performance?

The ADG902BRM-REEL7 in RM-8 package does not have an exposed pad - that feature applies only to the LFCSP variant (e.g., ADG902BCPZ). The RM-8 package uses standard gull-wing leads with no thermal pad. Confusion may arise because the datasheet shows both packages, but ADG902BRM-REEL7 is explicitly ordered in the MSOP (RM-8) configuration per the Ordering Guide. Therefore, thermal management relies on PCB copper area under the body and lead conduction, not pad soldering. ADG902BRM-REEL7's θJA is 206°C/W for MSOP, confirming no exposed pad involvement.

Is ADG902BRM-REEL7 pin-compatible with ADG901BRMZ-REEL7?

Yes, ADG902BRM-REEL7 and ADG901BRMZ-REEL7 share identical 8-lead MSOP (RM-8) pinouts: Pin 1 = VDD, Pin 2 = CTRL, Pins 3/5/6/7 = GND, Pin 4 = RF1, Pin 8 = RF2. However, they are not functionally interchangeable without circuit review - ADG901 is absorptive (50 Ω shunt), ADG902 is reflective (0 Ω shunt), resulting in different off-port VSWR and system-level matching behavior. Swapping them may cause unexpected reflections or degraded isolation in sensitive RF paths. ADG902BRM-REEL7 and ADG901BRMZ-REEL7 are mechanically compatible but electrically distinct.