Analog Devices Inc. AD8369ARUZ-REEL7

Overview

AD8369ARUZ-REEL7 from Analog Devices is a 45 dB digitally controlled variable gain amplifier (VGA) operating from LF to 600 MHz, featuring 3 dB gain steps, differential 200 Ω input/output impedance, 37 mA quiescent current at 5 V, and –69 dBc IMD3 at 70 MHz into 1 kΩ. It serves as a precision IF/RF gain control stage in high-linearity receiver signal chains.

For engineers reviewing the AD8369ARUZ-REEL7 datasheet, AD8369ARUZ-REEL7 pinout, AD8369ARUZ-REEL7 application, or AD8369ARUZ-REEL7 equivalent, key selection criteria include gain flatness (±0.1 dB over ±20 MHz bandwidth up to 380 MHz), noise figure (7.0 dB at max gain), output IP3 (+19.5 dBm at 70 MHz), power-down current (<1 mA), and dual serial/parallel digital interface support.

Technical Context

The AD8369ARUZ-REEL7 implements a hybrid X-AMP® architecture: a 6 dB-step R-2R ladder attenuator followed by a fixed-gain amplifier with 3 dB interpolating output gain switching. This achieves precise 3 dB gain steps across its full 45 dB span while maintaining constant –3 dB bandwidth up to 600 MHz.

Digital control is selectable via SENB pin: parallel mode uses BIT3–BIT0 with DENB latch (falling edge), serial mode repurposes BIT0 as data and BIT1 as clock. Power-up is managed by PWUP (7 ms response), and common-mode bias is stabilized via CMDC with external 0.01 µF decoupling.

Key Specifications

Pinout & Package

AD8369ARUZ-REEL7 is housed in a 16-lead TSSOP package (4.4 mm × 5.0 mm, 0.65 mm pitch), rated for –40°C to +85°C industrial operation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled VGA applications.

Compared with AD8369ARUZ-REEL7, AD8375ACPZ-R7 offers double the bandwidth but sacrifices 23 dB of gain range and triples quiescent current, while HMC624LP4E extends frequency coverage to 2.5 GHz but removes parallel control and increases power consumption by 2.7× - making AD8369ARUZ-REEL7 optimal for cost-sensitive, power-aware IF gain control up to 600 MHz.

Availability

AD8369ARUZ-REEL7 is available at Aetrix Electronics and suitable for cellular base stations, IF sampling receivers, fixed wireless access units, and instrumentation systems requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for AD8369ARUZ-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 DSP ICs, serving precision instrumentation, communications, and industrial markets with robust, application-optimized solutions.

The AD8369ARUZ-REEL7 belongs to Analog Devices' X-AMP® family of digitally controlled VGAs, engineered specifically for high-linearity, wideband IF/RF gain control in cellular infrastructure, wireless test equipment, and broadband receivers.

FAQ

What is the absolute maximum supply voltage for AD8369ARUZ-REEL7?

The absolute maximum supply voltage (VPOS) for AD8369ARUZ-REEL7 is 5.5 V. Exceeding this rating may cause permanent damage. The device operates over a recommended range of 3.0 V to 5.5 V, with typical quiescent current of 37 mA at 5 V and 32 mA at 3 V. Operation at 5.5 V is permissible only under transient conditions per Absolute Maximum Ratings; sustained use should remain within the specified 3.0–5.5 V operational range to ensure reliability and parametric compliance.

Does AD8369ARUZ-REEL7 support both serial and parallel digital interfaces simultaneously?

No, AD8369ARUZ-REEL7 does not support simultaneous serial and parallel operation. Interface mode is selected exclusively by the SENB pin: logic low (≤ VS/2) configures parallel mode (BIT0–BIT3 as data lines), while logic high (≥ VS/2) enables serial mode (BIT0 as data, BIT1 as clock). The two modes are mutually exclusive; mixing control signals from both interfaces will result in undefined behavior or incorrect gain setting. AD8369ARUZ-REEL7 must be hardwired to one mode during PCB layout.

What is the purpose of the FILT pin on AD8369ARUZ-REEL7?

The FILT pin on AD8369ARUZ-REEL7 connects to the internal offset nulling loop's high-pass corner network. An external capacitor from FILT to ground (e.g., 0.1 µF) lowers the loop's corner frequency from its nominal 520 kHz (±20%) to ~156 Hz, improving low-frequency DC stability and reducing drift in baseband or narrowband applications. This capacitor works in parallel with an internal 30 pF element; no external resistor is required. Omitting the FILT capacitor results in higher corner frequency and potential low-frequency gain error.

Can AD8369ARUZ-REEL7 drive a 50 Ω single-ended load directly?

No, AD8369ARUZ-REEL7 cannot directly drive a 50 Ω single-ended load. Its outputs (OPHI/OPLO) present a nominal 200 Ω differential impedance, optimized for balanced 200 Ω or 1 kΩ loads. Driving 50 Ω requires external impedance transformation - typically a balun (e.g., TC4-1W) or passive matching network - to avoid severe mismatch, gain error, and degraded return loss (S22). The datasheet specifies performance only for RL = 200 Ω or 1 kΩ; operation into 50 Ω is unsupported and invalidates published specs like IP3 and IMD3.

How does gain accuracy vary with temperature for AD8369ARUZ-REEL7?

AD8369ARUZ-REEL7 exhibits ≤ ±0.5 dB gain error over –40°C to +85°C at 70 MHz (3σ data across two lots), with worst-case deviation occurring at extremes of frequency and temperature. At 380 MHz and +85°C, gain error reaches ±0.5 dB relative to 25°C baseline; at 10 MHz and –40°C, it remains within ±0.2 dB. This variation is process- and temperature-dependent but tightly bounded - enabling robust AGC loop design without per-unit calibration. Full characterization data is provided in TPCs 25–29 of the AD8369 datasheet Rev. A.