Analog Devices Inc. AD8346ARU-REEL7

Overview

AD8346ARU-REEL7 from Analog Devices is a silicon RFIC quadrature modulator operating from 0.8 GHz to 2.5 GHz, delivering −10 dBm typical RF output power with 1° rms quadrature phase error and 0.2 dB I/Q amplitude balance at 1.9 GHz. It integrates differential LO interface, V-to-I converters, Gilbert-cell mixers, and a 50 Ω DC-coupled RF output stage for direct RF modulation in wireless transceivers.

For engineers reviewing the AD8346ARU-REEL7 datasheet, AD8346ARU-REEL7 pinout, AD8346ARU-REEL7 application, or AD8346ARU-REEL7 equivalent, key selection criteria include sideband suppression (−36 dBc @ 1.9 GHz), modulation bandwidth (dc to 70 MHz), supply current (45 mA active / 1 μA standby), noise floor (−147 dBm/Hz), and TSSOP-16 package compatibility with high-density RF layout requirements.

Technical Context

The AD8346ARU-REEL7 employs a cascaded polyphase network with buffer amplifiers to generate precise 90° LO quadrature across 0.8–2.5 GHz, minimizing phase drift over temperature and supply voltage. Its dual Gilbert-cell mixer core accepts differential baseband inputs (IBBP/IBBN, QBBP/QBBN) converted via voltage-to-current stages with 12 kΩ input impedance and 2 V p-p full-scale swing.

LO feedthrough is actively suppressed through internal bias control and external dc offset tuning capability; carrier feedthrough reaches −42 dBm (typ) and can be nulled to <−60 dBm using precision resistor networks. The differential-to-single-ended output stage drives 50 Ω loads with 1.25:1 VSWR and supports ac-coupled or dc-coupled baseband interfaces per AD9761 TxDAC reference designs.

Key Specifications

Pinout & Package

The AD8346ARU-REEL7 is housed in a 16-lead TSSOP package (6.5 mm × 5.1 mm × 1.1 mm), specified for −40°C to +85°C operation and compatible with standard surface-mount reflow profiles.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quadrature modulator applications.

Compared with TRF3705IRGET and MAX2022ETX+, the AD8346ARU-REEL7 offers superior phase/amplitude accuracy within its 0.8–2.5 GHz band and unique 1 μA standby capability - making it optimal for portable, multi-band, and EVM-critical wireless transmitters where power and spectral purity are jointly constrained.

Availability

AD8346ARU-REEL7 is available at Aetrix Electronics and suitable for cellular infrastructure, wireless sensor networks, Wi-Fi 6 access points, and RF test equipment requiring stable component supply across extended temperature and long product lifecycles.

Supply support for AD8346ARU-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 AD8346ARU-REEL7 belongs to Analog Devices' RF transceiver IC portfolio, engineered specifically for high-fidelity direct-conversion transmitters in digital communication systems demanding low EVM, wide modulation bandwidth, and robust thermal stability.

FAQ

What is the recommended LO drive level for optimal performance of the AD8346ARU-REEL7?

The AD8346ARU-REEL7 specifies an LO drive level of −10 dBm as optimal for balancing sideband suppression and linearity. At this level, sideband suppression reaches −36 dBc at 1.9 GHz while maintaining IM3 suppression at −60 dBc. Drive levels between −6 dBm and −12 dBm are acceptable, but −6 dBm improves temperature stability of output power, whereas −12 dBm increases noise floor impact. The AD8346ARU-REEL7 LO inputs require ac coupling due to internal ~800 mV bias.

Can the AD8346ARU-REEL7 operate from a 3.3 V supply, and how does that affect RF output power?

Yes, the AD8346ARU-REEL7 operates across 2.7 V to 5.5 V, including standard 3.3 V rails. At 3.3 V, typical SSB output power drops by ~1.5 dB compared to 5 V operation (e.g., −11.5 dBm vs. −10 dBm at 1.9 GHz), and P1dB decreases from −3 dBm to −4.5 dBm. Supply current remains within spec (35–55 mA), and quadrature accuracy is preserved - making 3.3 V viable for low-power portable designs where −11.5 dBm output suffices after PA gain.

How is carrier feedthrough minimized in the AD8346ARU-REEL7, and what external components support this?

Carrier feedthrough in the AD8346ARU-REEL7 is minimized via internal bias optimization and external dc offset tuning. The datasheet shows feedthrough can be nulled to <−60 dBm using precision-matched resistor networks (e.g., 0.1% ratio tolerance) on the I/Q input bias paths. In the AD9761 interface, small dc offsets applied to DAC outputs shift the null point; the AD8346ARU-REEL7's four COM ground pins also reduce common-mode coupling that contributes to residual feedthrough.

Does the AD8346ARU-REEL7 support dc-coupled or ac-coupled baseband inputs, and what are the trade-offs?

The AD8346ARU-REEL7 supports both dc-coupled and ac-coupled baseband interfaces. Dc coupling (e.g., from AD9761) enables full 2 V p-p differential swing but requires precision resistor networks to maintain 1.2 V common-mode bias and prevent offset-induced feedthrough. Ac coupling eliminates dc bias matching sensitivity and preserves full 2 V p-p swing, though it introduces a high-pass corner (~14 kHz with recommended RC values) that may attenuate low-frequency OFDM pilots or NB-IoT waveforms.

What is the function of the four separate COM pins (COM1–COM4) on the AD8346ARU-REEL7?

The AD8346ARU-REEL7 features four dedicated ground terminals - COM1 (LO phase splitter), COM2 (input stage of output amp), COM3 (output stage of output amp), and COM4 (baseband V-to-I/mixer core) - to isolate noise-sensitive circuit blocks. This separation prevents LO switching noise from modulating baseband inputs and avoids RF output harmonics coupling into mixer bias lines. All four must connect to a low-impedance ground plane; splitting them across different PCB ground islands degrades sideband suppression and increases EVM.