Analog Devices Inc. AD8349AREZ-RL7

Overview

AD8349AREZ-RL7 from Analog Devices is a monolithic RF quadrature modulator engineered for direct-conversion transmitter architectures in 700 MHz to 2700 MHz cellular infrastructure. It delivers 5.6 dBm P1dB at 2140 MHz, 0.3° quadrature error, 0.1 dB amplitude balance, and –156 dBm/Hz noise floor-enabling high-fidelity WCDMA and LTE uplink signal synthesis in base station radio units.

For engineers reviewing the AD8349AREZ-RL7 datasheet, AD8349AREZ-RL7 pinout, AD8349AREZ-RL7 application, or AD8349AREZ-RL7 equivalent, key selection criteria include LO-to-RF frequency coverage, I/Q imbalance performance across temperature, output enable settling time (<50 ns), and compatibility with 1.2 V_p-p differential baseband DAC interfaces.

Technical Context

The AD8349AREZ-RL7 integrates a polyphase LO splitter with dual Gilbert-cell mixers and a differential-to-single-ended output amplifier. Its LO interface uses cascaded R-C polyphase networks to maintain <0.3° phase quadrature error and <0.1 dB amplitude balance across 700–2700 MHz.

Baseband inputs (IBBP/IBBN/QBBP/QBBN) are high-impedance, require 400 mV dc bias, and support 160 MHz large-signal bandwidth. The ENOP pin controls RF output enable/disable with 20 ns turn-on and 50 ns turn-off settling into a 50 Ω load.

Key Specifications

Pinout & Package

AD8349AREZ-RL7 is housed in a 16-lead exposed-paddle TSSOP package (RoHS-compliant, moisture sensitivity level 3). The EPAD must be soldered to a low-impedance ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD8345ARUZ, AD8349AREZ-RL7 extends upper frequency coverage by 500 MHz and adds nanosecond-scale output enable-critical for TDD systems-while maintaining identical pinout. Versus TRF3705IRGZT, it trades integrated LO synthesis for lower power (150 mA), smaller footprint, and simplified biasing, favoring modular radio architectures.

Availability

AD8349AREZ-RL7 is available at Aetrix Electronics and suitable for cellular infrastructure, wireless backhaul, and broadband access systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for production ramp.

Supply support for AD8349AREZ-RL7 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 communications, industrial, and automotive markets with precision signal processing solutions.

The AD8349AREZ-RL7 belongs to Analog Devices' RF Modulator product line, designed specifically for high-linearity, wideband direct-conversion transmitters in 3G/4G/5G infrastructure equipment where phase accuracy, noise floor, and thermal stability are critical.

FAQ

What is the recommended LO drive level for AD8349AREZ-RL7?

The AD8349AREZ-RL7 is characterized at –6 dBm LO input, with specified operation from –10 dBm to 0 dBm. Drive levels outside this range degrade carrier feedthrough and sideband suppression. For optimal 2140 MHz WCDMA performance, –6 dBm is recommended to balance linearity and power consumption. The AD8349AREZ-RL7 internal LO buffers tolerate up to 10 dBm but do not improve performance beyond 0 dBm.

Does AD8349AREZ-RL7 require external DC biasing on its baseband inputs?

Yes, AD8349AREZ-RL7 baseband inputs (IBBP/IBBN/QBBP/QBBN) are not self-biased and require an external 400 mV dc bias. This bias sets the common-mode point for the internal V-to-I converters. Without proper biasing, the AD8349AREZ-RL7 exhibits severe carrier feedthrough and distorted I/Q modulation. A precision voltage reference or resistor divider from VPS2 is typically used.

Can AD8349AREZ-RL7 operate from a single 5 V supply?

Yes, AD8349AREZ-RL7 operates from a single 4.75 V to 5.5 V supply applied to both VPS1 and VPS2. The device draws 135–150 mA total supply current when enabled. Both supply pins must be independently bypassed with 0.1 μF ceramic and 100 pF capacitors to ground to ensure stable RF performance and minimize supply-induced phase noise.

How does the ENOP pin function in AD8349AREZ-RL7?

The ENOP pin on AD8349AREZ-RL7 provides TTL-compatible RF output enable/disable control. When pulled high (>2.0 V), the AD8349AREZ-RL7 operates normally; when pulled low (<0.8 V), RF output drops below –50 dBm within 50 ns. During disable, LO driver power is cut to minimize feedthrough, while the D-to-S amplifier remains powered to preserve 50 Ω output impedance.

Is AD8349AREZ-RL7 pin-compatible with AD8346?

Yes, AD8349AREZ-RL7 is pin-compatible with AD8345 and AD8346, sharing identical 16-lead TSSOP pinout, supply configuration, and baseband/LO interface topology. This allows direct replacement in existing designs. However, AD8349AREZ-RL7 offers extended frequency range (up to 2700 MHz vs. 2200 MHz), improved P1dB, and added ENOP functionality not present in AD8346.