ADI AD8313ARMZ

RF power measurement across a wide dynamic range and frequency band is a recurring requirement in both military and commercial wireless system design — and the AD8313ARMZ delivers it in a package small enough to place directly on the RF signal path without a dedicated PCB area budget. Seventy decibels of dynamic range from 0.1 GHz to 2.5 GHz, 40 ns response time for burst signal detection, and a dual detector/controller operating mode that eliminates the external error amplifier in PA control loops — all from a single 8-lead MSOP on a single 2.7V to 5.5V supply at 40 mW. For engineers evaluating the AD8313 datasheet, the ARMZ variant is the standard tape-and-reel MSOP format for production board assembly.

AD8313ARMZ Architecture: Eight-Stage Log Amp with Detector and Controller Modes

The AD8313’s cascaded architecture uses eight amplifier stages, each providing 8 dB of gain, followed by nine successive detector cells whose rectified outputs are summed at the output stage. This “successive detection” topology provides a log response that is inherently accurate over a wide dynamic range — each detector cell handles a specific 8 dB slice of the total input range, and the summed output is proportional to the log of the total input power across all active cells. The bandgap reference that sets the slope and intercept is temperature-compensated, contributing to the stable log response across the –40°C to +85°C operating range. In controller mode, the VSET input applies a setpoint voltage that subtracts from the detector output — the resulting VOUT error signal drives the PA gain control directly, with the loop settling when measured and desired power match. A single external integrating capacitor on the CINT pin sets the loop filter bandwidth.

AD8313ARMZ vs AD8317 and AD8318: Logarithmic Detector Selection

The AD8313 is part of a broader ADI logarithmic detector family. For engineers selecting between variants:

The AD8313ARMZ is the correct selection for applications where the 0.1 GHz to 2.5 GHz frequency range covers the system’s band of interest and the 8-lead MSOP package is preferred. For wideband coverage to 8 GHz or 10 GHz, the AD8318 and AD8317 are the appropriate upgrades. For designs using the 5962-9312901MPA AD829 high-speed op amp in the signal chain, the AD8313ARMZ provides a compatible RF power detection stage operating at the same frequency range.

Sourcing the ADI AD8313ARMZ

The AD8313ARMZ is an active-production standard product with broad distribution availability across RF, communications, and defense-adjacent programs. We carry verified inventory with full lot traceability and anti-counterfeit inspection on every order. Contact us today to confirm availability and request a quote — our team responds within 24 hours.

• Detector and controller modes in one package — eliminates external error amplifier in PA ALC loop designs
• 40 ns full-scale response enables burst and pulsed RF power detection in radar and EW receive chains
• Slope and intercept stable over supply and temperature — no compensation required across operating range
• PWDN pin reduces standby current to 20 µA — enables duty-cycled power measurement with minimal overhead
• Input coupling flexible — capacitor pairs, transformer, printed balun, or directional coupler all supported
• CINT pin sets controller loop bandwidth independently of signal path — single capacitor selection
• Reel variants available: AD8313ARMZ-REEL (3000 unit) and AD8313ARMZ-REEL7 (1000 unit)
• Full lot traceability and anti-counterfeit inspection on every order

Frequently Asked Questions (FAQ)

What Is the ADI AD8313ARMZ and What Does It Measure?

The AD8313ARMZ is a complete demodulating logarithmic amplifier and power detector covering 0.1 GHz to 2.5 GHz with 70 dB dynamic range and ±1 dB log conformance over 65 dB. It converts the RF input power to a DC voltage proportional to the power in dBm, with a 20 mV/dB output slope, operating from a single 2.7V to 5.5V supply in an 8-lead MSOP package rated for –40°C to +85°C industrial operation.

What Is the Difference Between Detector Mode and Controller Mode?

In detector mode, the VSET pin connects directly to VOUT — the output is a simple log power measurement with no feedback. In controller mode, VSET is driven by an external setpoint voltage proportional to the desired power level. VOUT then produces an error signal — the difference between measured and desired log power — that drives the gain control terminal of a PA in a closed loop. The loop settles when the actual input power matches the VSET setpoint, providing transmit power level control without a separate error amplifier.

How Does the AD8313ARMZ Handle Signal Coupling?

The INHI and INLO differential inputs require AC coupling — there must be no DC path from the inputs to ground. Signal can be coupled using dual series capacitors, a flux-linked transformer, a printed circuit balun, or direct drive from a directional coupler. The input impedance is 900Ω differential, requiring a matching network for 50Ω or 75Ω system impedances — the datasheet provides reference matching networks for both resistive broadband and narrow-band configurations.

What Is the ARMZ Suffix on the AD8313ARMZ?

The ARMZ suffix identifies the 8-lead MSOP (RM-8) package in standard tape-and-reel format. The “Z” at the end denotes RoHS compliance. The AD8313ARMZ-REEL is the 3000-unit reel variant; the AD8313ARMZ-REEL7 is the 1000-unit mini-reel for smaller production volumes. All three are electrically identical.

How Do I Request a Quote for the ADI AD8313ARMZ?

Submit an inquiry through our website contact form or email our sales team directly. We will respond within 24 hours with pricing, availability, and lead time — and can discuss volume pricing or long-term supply agreements if needed.