Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Switch type | Reflective SPST |
| Frequency range | DC to 4.5 GHz at -3 dB |
| Insertion loss | 0.8 dB typical at 1 GHz |
| Off isolation | 40 dB typical at 1 GHz |
| P1dB | 17 dBm typical at 1 GHz |
| Supply voltage | 1.65 V to 2.75 V |
| Control | CMOS/LVTTL |
| Package | 8-lead MSOP |
Product Overview
The ADG902BRMZ is the 8-lead MSOP version of Analog Devices’ ADG902 reflective SPST RF switch. It shares the ADG901 family’s low-voltage CMOS architecture and DC-to-4.5 GHz bandwidth, but its off-state RF termination is reflective rather than 50 Ω absorptive.
That topology difference is the main selection issue. At 1 GHz the device offers 0.8 dB typical insertion loss, 40 dB typical off isolation and 17 dBm typical P1dB, yet the open-state impedance behavior is intentionally different from the ADG901. A design sensitive to mismatch, resonances or source load-pull should therefore choose between the two on system behavior, not on headline loss alone.
Technical Specifications
| Parameter | Confirmed Information |
|---|---|
| Topology | SPST |
| Off-state behavior | Reflective |
| Bandwidth | DC to 4.5 GHz at -3 dB |
| Insertion loss at 1 GHz | 0.8 dB typical |
| Off isolation at 1 GHz | 40 dB typical |
| P1dB at 1 GHz | 17 dBm typical |
| Supply voltage | 1.65 V to 2.75 V |
| Supply current | <1 µA |
| Control input | CMOS/LVTTL compatible |
| DC signal passing | Up to 0.5 V without a DC-blocking capacitor |
| Package | 8-lead MSOP |
| Product status | Production |
Design Considerations
A reflective off state can be useful when the disconnected path does not require a matched termination, but it can also produce a stronger impedance discontinuity than an absorptive switch. Check the source and load response in both switch states if the RF path contains high-Q filters or amplifiers sensitive to mismatch.
The device can pass a small DC component, but the documented limit still applies. Use DC-blocking components whenever the signal’s bias condition falls outside the switch’s specified direct-passing range.
Related Engineering Resources
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