Analog Devices Inc. HMC697LP4

Overview

HMC697LP4 from Analog Devices (formerly Hittite Microwave) is a SiGe wideband direct quadrature modulator IC operating from 200 MHz to 4000 MHz, delivering +8 dBm typical output P1dB, −165 dBm/Hz noise floor, and +22 dBm typical OIP3. It supports complex modulation schemes including QPSK and QAM in cellular base stations and WiMAX transceivers.

For engineers reviewing the HMC697LP4 datasheet, HMC697LP4 pinout, HMC697LP4 application, or HMC697LP4 equivalent, key selection criteria include its uncalibrated sideband suppression (42–45 dBc), carrier feedthrough (−33 to −40 dBc), LO input power range (−6 to +6 dBm), and single-ended 50 Ω RF output interface requiring no external matching.

Technical Context

The HMC697LP4 integrates I/Q mixer cores with on-chip biasing and LO distribution circuitry optimized for high linearity and low noise across 200–4000 MHz. Its differential baseband inputs (IP/IN, QP/QN) accept ±0.8 Vpp AC signals centered at +1.5 V DC, enabling direct interfacing with high-speed DACs.

It employs a single-ended or differential LO drive architecture with 12–15 dB return loss and requires two independent +5 V supplies (Vcc1 = 79 mA, Vcc2 = 88 mA). The RF output is DC-coupled and internally matched to 50 Ω, eliminating external baluns or matching networks.

Key Specifications

Pinout & Package

Package: 24-lead 4×4 mm QFN (LP4) with exposed ground paddle; RoHS-compliant variant HMC697LP4E uses matte Sn finish and MSL1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADL5375-05 and TRF3705, the HMC697LP4 offers superior uncalibrated sideband suppression (42–45 dBc vs. ≤40 dBc) and higher output P1dB (+8 dBm), making it optimal for compact, high-performance transmitters where calibration complexity must be minimized.

Availability

HMC697LP4 is available at Aetrix Electronics and suitable for UMTS base stations, WiMAX CPE, and ISM transceivers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for HMC697LP4 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 maintains its high-frequency RFIC portfolio for communications infrastructure and defense applications.

The HMC697LP4 belongs to the Hittite legacy wideband modulator product line, designed specifically for zero-IF and direct-conversion transmitters in cellular, broadband wireless, and ISM systems.

FAQ

What is the recommended LO drive level for HMC697LP4?

The HMC697LP4 specifies −6 dBm to +6 dBm LO input power across its 200–4000 MHz range. At 0 dBm LO drive, typical performance includes +8 dBm P1dB, +22 dBm OIP3, and −165 dBm/Hz noise floor. Driving outside this range risks compression or degraded linearity. The HMC697LP4 supports both single-ended (LOP only) and differential (LOP/LON) LO configurations with appropriate DC blocking.

Does HMC697LP4 require external RF output matching?

No, the HMC697LP4 features an internally matched 50 Ω single-ended RF output port (Pin 16). No external matching components are required for 50 Ω system interfaces. However, an AC-blocking capacitor must be placed in series with RFOUT to prevent DC coupling into downstream stages. This integrated match reduces bill-of-materials and simplifies layout versus alternatives requiring discrete baluns or matching networks.

What baseband input voltage levels does HMC697LP4 support?

The HMC697LP4 accepts differential baseband inputs (IP/IN and QP/QN) biased at +1.5 V DC (±0.1 V), with nominal AC swing of 1.6 Vpp differential. Input capacitance is 4.5 pF per pin (de-embedded to lead). The device draws only 90 µA DC bias current per channel, enabling direct connection to high-impedance DAC outputs without active buffering in most implementations.

Is HMC697LP4 pin-compatible with HMC697LP4E?

Yes, HMC697LP4 and HMC697LP4E share identical pinout, footprint, and electrical specifications. The sole difference is RoHS compliance: HMC697LP4E uses 100% matte tin lead finish and supports peak reflow up to 260 °C, while HMC697LP4 uses Sn/Pb and max reflow of 235 °C. Both are MSL1 rated and mechanically interchangeable in PCB assembly.

What is the operating temperature range for HMC697LP4?

The HMC697LP4 is specified for continuous operation from −40 °C to +85 °C ambient temperature. Performance data-including sideband suppression, carrier feedthrough, and OIP3-is characterized across this range, with worst-case uncalibrated values plotted at −40 °C, +25 °C, and +85 °C. Junction temperature must not exceed 150 °C, and thermal resistance from channel to ground paddle is 20.2 °C/W.