Analog Devices Inc. AD8367ARUZ

Overview

AD8367ARUZ from Analog Devices is a 500 MHz linear-in-dB variable gain amplifier (VGA) with integrated square-law RMS detector, designed for IF/RF signal conditioning in 200 Ω systems. It delivers −2.5 dB to +42.5 dB analog gain control at 20 mV/dB scaling, supports AGC loop operation with 354 mV_rms setpoint, and operates from 2.7 V to 5.5 V supply. It is used in cellular base station IF chains for dynamic signal level management.

For engineers reviewing the AD8367ARUZ datasheet, AD8367ARUZ pinout, AD8367ARUZ application, or AD8367ARUZ equivalent, key selection considerations include its 500 MHz 3 dB bandwidth, 45 dB gain range with ±0.2 dB conformance (100–900 mV VGAIN), 70 MHz noise figure of 6.2 dB at max gain, output IP3 of +36.5 dBm (re 200 Ω), and TSSOP-14 package compatibility with high-speed layout requirements.

Technical Context

The AD8367ARUZ implements Analog Devices' X-AMP® architecture: a 9-stage 200 Ω resistive ladder attenuator (5 dB/stage) followed by a 42.5 dB fixed-gain feedback amplifier with 100 GHz gain-bandwidth product. Gain is controlled via voltage applied to GAIN pin, with MODE pin selecting positive-slope (+20 mV/dB) or negative-slope (−20 mV/dB) response - the latter required for AGC mode.

Its on-chip square-law detector provides RSSI output at DETO pin referenced to 354 mV_rms, enabling closed-loop automatic gain control using external C_AGC. Output centering is maintained via DECL/HPFL loop with user-defined corner frequency, while input presents nominal 200 Ω impedance and output includes internal 50 Ω series resistor optimized for 200 Ω load matching.

Key Specifications

Pinout & Package

AD8367ARUZ is housed in a 14-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), rated for −40°C to +85°C industrial operation. Pin 1 is ICOM (signal common), and all ground pins (ICOM ×3, OCOM) must connect to low-impedance ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar variable gain amplifier applications.

Compared with AD8367ARUZ, ADL5330 offers broader RF coverage but lacks integrated AGC capability, while LMH6505 provides superior high-frequency bandwidth at the cost of reduced gain range and no detector - making AD8367ARUZ optimal for 200 Ω IF AGC systems below 500 MHz.

Availability

AD8367ARUZ is available at Aetrix Electronics and suitable for cellular infrastructure, broadband access equipment, and high-speed data interface designs requiring stable component supply, consistent parametric performance, and long-term industrial temperature support.

Supply support for AD8367ARUZ 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD8367ARUZ belongs to Analog Devices' X-AMP® family of precision variable gain amplifiers, engineered specifically for high-dynamic-range IF signal chains in wireless infrastructure and instrumentation where linear-in-dB control and integrated detection are essential.

FAQ

What is the gain control voltage range for AD8367ARUZ in positive-slope mode?

The AD8367ARUZ accepts a gain control voltage (VGAIN) from 50 mV to 950 mV in positive-slope (MODE = HI) mode, corresponding linearly to −2.5 dB to +42.5 dB gain at 20 mV/dB scaling. Operation outside this range degrades linearity; the device remains functional but gain conformance exceeds ±0.2 dB specification.

How does the AD8367ARUZ implement automatic gain control (AGC)?

The AD8367ARUZ implements AGC using its on-chip square-law detector: when MODE is pulled LOW and DETO is connected to GAIN, the detector compares VOUT to a fixed 354 mV_rms setpoint and generates corrective current. An external capacitor (C_AGC) from DETO to ground integrates this current to produce the AGC bias voltage that stabilizes output level.

What is the recommended output termination for AD8367ARUZ?

The AD8367ARUZ is optimized for a 200 Ω load, despite its internal 50 Ω output series resistor. Connecting a 200 Ω load ensures specified distortion (OIP3), noise figure, and gain flatness. Using 50 Ω directly causes ~6 dB gain loss and degraded OIP3; reactive matching networks are required for non-200 Ω interfaces.

Can AD8367ARUZ operate from a 3.3 V supply?

Yes, AD8367ARUZ fully supports 3.3 V single-supply operation within its 2.7 V–5.5 V range. At 3.3 V, typical supply current is 24 mA, output swing reduces to ~2.8 V_p-p (RL = 200 Ω), and OIP3 drops to +32.5 dBm - all within datasheet specifications and validated for industrial temperature range.

What is the function of the DECL and HPFL pins on AD8367ARUZ?

DECL and HPFL form a feedback loop that centers the AD8367ARUZ output dc bias at VS/2. A capacitor from HPFL to ground (with optional 100 Ω series resistor) sets the loop's corner frequency; typical 10 nF yields ~10 kHz corner. This prevents output saturation during large ac swings and maintains headroom for full-scale signal handling.