Analog Devices Inc. AD8343ARUZ

Overview

AD8343 from Analog Devices is a high-performance broadband active mixer IC designed for RF frequency translation in demanding transmit and receive signal chains. It delivers 7 dB typical conversion gain, +16.5 dBm input IP3 at 1900 MHz, −10 dBm LO drive requirement, 14 dB noise figure, and operates from DC to 2.5 GHz across all ports. It is used in cellular base station up/downconverters where high linearity and wideband operation are critical.

For engineers reviewing the AD8343 datasheet, AD8343 pinout, AD8343 application, or AD8343 equivalent, key selection criteria include differential RF/LO/IF port architecture, 5 V single-supply operation with power-down mode, open-emitter input / open-collector output topology, and bias resistor–set current scalability (20–60 mA total).

Technical Context

The AD8343 implements a silicon bipolar-based double-balanced active mixer core with hard-limited differential LO driving transistor bases to steer emitter currents between alternating output pairs. Its PTAT bias cell ensures thermal stability of LO driver and mixer core performance across −40°C to +85°C.

All ports-RF (INPP/INPM), LO (LOIP/LOIM), and IF (OUTP/OUTM)-are fully differential and DC-coupled, enabling direct interface to baluns or differential filters. The LO driver provides 50 Ω differential input impedance and supports −12 dBm to −3 dBm drive, minimizing external amplification needs.

Key Specifications

Pinout & Package

The AD8343 is housed in a 14-lead TSSOP package with exposed pad (RoHS-compliant, JEDEC MO-153). All COMM pins must be connected to low-impedance ground for optimal RF performance and thermal dissipation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar active mixer applications.

Compared with HMC213MS8G and LT5560, the AD8343 uniquely combines DC-to-2.5 GHz bandwidth, −10 dBm LO drive, integrated power-down, and adjustable bias current - making it the only option among the three qualified for high-dynamic-range, thermally stable, and power-gated infrastructure applications.

Availability

AD8343 is available at Aetrix Electronics and suitable for cellular base stations, wireless LAN access points, satellite converters, and RF instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for AD8343 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 RF ICs, serving precision instrumentation, communications, and industrial markets since 1965.

The AD8343 belongs to Analog Devices' high-linearity RF mixer product line, engineered specifically for broadband wireless infrastructure where IP3, gain flatness, and thermal stability are non-negotiable.

FAQ

What is the recommended LO drive level for optimal performance of the AD8343?

The AD8343 achieves best-in-class IP3 and conversion gain with −10 dBm differential LO drive into its 50 Ω input. Drive levels below −12 dBm degrade IP3; above −3 dBm risk distortion or reliability issues. The internal LO driver is optimized for this range, eliminating need for external amplification in most 50 Ω systems. Always verify LO waveform symmetry using a differential probe when tuning the AD8343.

Can the AD8343 be used in DC-coupled RF signal paths?

Yes - the AD8343 supports true DC-coupled operation on all ports. Its open-emitter RF inputs and open-collector IF outputs allow baseband and low-IF applications (e.g., zero-IF receivers). However, DC bias must be applied externally per datasheet guidelines: 1.2 V on INPP/INPM, and VPOS on OUTP/OUTM. AC coupling remains preferred for RF bandpass filtering and LO leakage mitigation.

How does the PWDN pin function, and what are its timing characteristics?

The PWDN pin places the AD8343 into ultra-low-power mode (<95 µA) when pulled to ≥4.0 V (within 0.5 V of VPOS); it enables normal operation when held ≤2.5 V. Turn-on time is 500 ns; turn-off is 2.2 µs. A 25 kΩ pull-up to VPOS is recommended if unused. This feature enables rapid power gating in TDD systems without compromising mixer settling or calibration stability.

What external components are required to bias the AD8343 for 50 mA total current?

To achieve 50 mA total quiescent current, two 1% metal-film resistors (R3 = R4 = 68.1 Ω) are required between INPP/INPM and COMM, per Figure 72 in the AD8343 Rev. B datasheet. VPOS must be bypassed with 0.01–0.1 µF ceramic, DCPL with 0.1 µF, and each output pulled up to VPOS via matching network or transformer. No external LO buffer is needed at −10 dBm drive.

Does the AD8343 support both upconversion and downconversion?

Yes - the AD8343 is bidirectional and equally effective for upconversion (e.g., 150 MHz IF → 900 MHz RF) and downconversion (e.g., 2400 MHz RF → 170 MHz IF). Its symmetric differential architecture and broadband response ensure consistent conversion gain, IP3, and noise figure regardless of signal flow direction. Application circuits differ only in filter placement and LO frequency selection - both validated in the AD8343 datasheet's "Downconverting Mixer" and "Upconverting Mixer" sections.