Analog Devices Inc. 121965-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 serves as the RF upconversion stage in digital transmitters for cellular base stations, WiMAX, and ISM transceivers, with single-ended 50 Ω RFOUT and dual-supply +5 V operation.

For engineers reviewing the HMC697LP4 datasheet, HMC697LP4 pinout, HMC697LP4 application, or HMC697LP4 equivalent, key selection criteria include uncalibrated sideband suppression (≥42 dBc), carrier feedthrough (−33 to −40 dBm), LO input power range (−6 to +6 dBm), baseband DC bias tolerance (+1.4 to +1.6 V), and 24-lead 4×4 mm QFN package compatibility with high-speed DAC interfacing.

Technical Context

The HMC697LP4 implements a SiGe-based direct-conversion I/Q modulator architecture with differential baseband inputs (IP/IN, QP/QN) biased at +1.5 V DC and capable of 1.6 V_PP differential swing. Its RF output is DC-coupled and internally matched to 50 Ω without external matching components.

LO port supports both single-ended (via LOP) and differential drive modes, with 12 dB minimum return loss across 200–4000 MHz. The device uses two independent +5 V supplies (Vcc1 = 79 mA, Vcc2 = 88 mA) and operates over −40 °C to +85 °C with Class 1A ESD rating.

Key Specifications

Pinout & Package

Housed in a 24-lead, 4×4 mm QFN package (LP4) with exposed ground paddle, the HMC697LP4 uses Sn/Pb lead finish and carries MSL1 rating. Ground pins (2, 5, 8, 11, 12, 14, 17, 19, 20, 23) and the paddle must connect to a low-inductance RF/DC ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADL5375-05 and TRF372017, the HMC697LP4 offers superior uncalibrated sideband suppression (42–45 dBc vs. ≤38 dBc) and higher OIP3 (+22 dBm vs. +19 dBm), making it preferred for infrastructure-grade transmitters where image rejection and multi-carrier linearity dominate design constraints.

Availability

HMC697LP4 is available at Aetrix Electronics and suitable for cellular base station development, WiMAX equipment manufacturing, and ISM transceiver production requiring stable component supply and long-term lifecycle support.

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, emphasizing performance, reliability, and signal integrity in wireless infrastructure and defense applications.

The HMC697LP4 belongs to Analog Devices' legacy Hittite direct-conversion modulator product line, engineered specifically for wideband digital transmitters demanding high linearity, low noise, and simplified RF front-end integration.

FAQ

What is the recommended LO drive level for optimal performance of the HMC697LP4?

The HMC697LP4 achieves best sideband suppression and carrier feedthrough when driven with 0 dBm LO power. Performance remains within specification across −6 to +6 dBm, but uncalibrated sideband suppression degrades by ~2 dB at ±6 dBm versus 0 dBm. For production systems targeting <−40 dBc sideband rejection, 0 dBm LO is strongly advised. The HMC697LP4 datasheet specifies this condition for all typical performance plots.

Does the HMC697LP4 require external matching components at the RF output?

No, the HMC697LP4 features an internally matched 50 Ω single-ended RF output (Pin 16). No external matching network is needed-only a DC-blocking capacitor is required in series with the RFOUT path. This eliminates tuning complexity and improves repeatability across PCBs, as confirmed in the "General Description" and "Application Schematic" sections of the official HMC697LP4 datasheet.

Can the HMC697LP4 be operated with a single 5 V supply instead of dual supplies?

No-the HMC697LP4 requires two independent +5 V supplies: Vcc1 (Pin 18, 79 mA) powers the mixer and output stage, while Vcc2 (Pin 24, 88 mA) powers the LO buffer. Sharing a single rail risks LO injection into the RF path and degrades carrier feedthrough by >6 dB. The functional diagram and absolute maximum ratings explicitly define separate supply domains, and evaluation board schematics implement dedicated decoupling for each.

What is the baseband input impedance and DC bias requirement for the HMC697LP4 I/Q ports?

The I and Q differential baseband inputs (IP/IN, QP/QN) present high impedance (>100 kΩ) and require a nominal +1.5 V DC bias, with allowable range +1.4 to +1.6 V. Input capacitance is 4.5 pF per pin (de-embedded). These values are specified in the "Baseband Input Port" table and verified in the "Test Conditions" section of the HMC697LP4 datasheet v03.0712.

Is the HMC697LP4 pin-compatible with the HMC697LP4E variant?

Yes-the HMC697LP4 and HMC697LP4E share identical pinout, footprint, and electrical specifications. The only difference is RoHS compliance: HMC697LP4E uses 100% matte tin lead finish and has a higher 260 °C peak reflow rating, while HMC697LP4 uses Sn/Pb and 235 °C. Both are MSL1 and mechanically interchangeable in existing layouts, as documented in the "Package Information" table on page 5 of the datasheet.