Analog Devices Inc. HMC696LP4E

Overview

HMC696LP4E from Analog Devices (formerly Hittite Microwave) is a SiGe wideband direct quadrature modulator RFIC designed for zero-IF and low-IF transmitter architectures. It operates from 20 MHz to 2700 MHz, delivers +8 dBm typical P1dB output, achieves −162 dBm/Hz noise floor at 30 MHz offset, and provides +24 dBm typical OIP3 in the 100–450 MHz band - enabling high-fidelity digital modulation in SDR and multi-band cellular transmitters.

For engineers reviewing the HMC696LP4E datasheet, HMC696LP4E pinout, HMC696LP4E application, or HMC696LP4E equivalent, key selection criteria include its 24-pin 4×4 mm QFN package, single-ended 50 Ω RF output, dual 5 V supplies (Vcc1/Vcc2), differential I/Q baseband inputs with 1.5 V DC bias, and LO drive flexibility (0 to +10 dBm, single-ended or differential).

Technical Context

The HMC696LP4E implements a passive double-balanced mixer core with integrated LO buffer and baseband amplifiers, optimized for wideband I/Q signal cancellation without external calibration circuitry. Its SiGe process enables high linearity across 20–2700 MHz while maintaining low noise floor and stable carrier/sideband suppression over temperature.

It supports uncalibrated sideband suppression down to −54 dBc (at 100–450 MHz) and carrier feedthrough as low as −45 dBm, with calibrated performance further improved via manual I/Q amplitude/phase and DC offset tuning. Baseband input impedance is high (>100 kΩ), with 4.5 pF de-embedded capacitance and ±700 mVpp differential AC swing capability.

Key Specifications

Pinout & Package

Package: 24-lead, 4×4 mm QFN (LP4), RoHS-compliant, exposed ground paddle, MSL1, matte tin finish. Pin 1 marked with dot; ground paddle must be soldered to PCB ground plane with ≥6 thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC697LP4E and ADL5375-05, the HMC696LP4E uniquely balances ultra-wide 20–2700 MHz RF coverage, −162 dBm/Hz noise floor, and compact 4×4 mm LP4 packaging - making it the preferred choice for cost-sensitive, space-constrained multi-band transmitters where sub-450 MHz operation is essential.

Availability

HMC696LP4E is available at Aetrix Electronics and suitable for cellular infrastructure, software-defined radio, and test equipment applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for HMC696LP4E 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 acquired Hittite Microwave in 2014 and integrates its high-frequency RFIC portfolio into precision analog and RF solutions for communications, defense, and instrumentation markets.

The HMC696LP4E belongs to Hittite's SiGe wideband modulator product line, engineered specifically for zero-IF transmitter architectures demanding wide frequency coverage, high linearity, and low noise in compact SMT packages.

FAQ

What is the recommended LO drive level for optimal performance of the HMC696LP4E?

The HMC696LP4E achieves best linearity and sideband suppression with LO input power between +3 dBm and +7 dBm. At 0 dBm, OIP3 drops ~2 dB; above +10 dBm risks damage per absolute maximum ratings. Single-ended drive via LOP (with LON grounded through 100 nF) is validated and commonly used in reference designs.

Does the HMC696LP4E require external DC blocking on the RF output?

Yes, the HMC696LP4E RFOUT pin is DC-coupled and internally matched to 50 Ω, so an external AC-blocking capacitor (e.g., 100 pF, 0402) is mandatory before connecting to downstream 50 Ω loads or filters. Omitting this capacitor causes DC bias disruption and potential damage to sensitive RF components.

Can the HMC696LP4E operate from a single 5 V supply?

No - the HMC696LP4E requires two independent +5 V supplies: Vcc1 (74 mA) powers the mixer/output stage, and Vcc2 (85 mA) powers the LO buffer. Sharing rails causes LO injection leakage and degraded sideband suppression; separate regulation and decoupling for each rail are specified in the evaluation board schematic.

What is the baseband input impedance and bias requirement for the HMC696LP4E I/Q ports?

The HMC696LP4E I/Q inputs (IP/IN, QP/QN) present high input impedance (>100 kΩ) with 4.5 pF de-embedded capacitance. They require +1.5 V DC bias (±0.1 V) applied equally to all four pins, and accept ±350 mVpp differential AC swing (700 mVpp peak-to-peak) for nominal operation.

Is the HMC696LP4E pin-compatible with the HMC697LP4E?

Yes - the HMC696LP4E and HMC697LP4E share identical 24-pin 4×4 mm LP4 QFN packaging, pin assignment, and mounting footprint. This allows drop-in replacement in existing layouts when upgrading to higher-frequency operation (450–4000 MHz), though RF performance trade-offs must be verified per band.