Analog Devices Inc. ADRF6720ACPZ-R7

Overview

ADRF6720ACPZ-R7 from Analog Devices is a wideband quadrature modulator integrating a fractional-N PLL, four multicore VCOs, and RF tunable balun-enabling single-ended 700–3000 MHz RF output. It delivers 12.2 dBm P1dB and −37.6 dBc sideband suppression at 2140 MHz, with >1000 MHz baseband modulation bandwidth and 3.3 V/425 mA operation. Used in LTE base station transmitters for direct-conversion RF upconversion.

For engineers reviewing the ADRF6720ACPZ-R7 datasheet, ADRF6720ACPZ-R7 pinout, ADRF6720ACPZ-R7 application, or ADRF6720ACPZ-R7 equivalent, key selection criteria include integrated LO synthesis range (356.25–2855 MHz), carrier feedthrough nulling capability, HD3/IP3 optimization registers, and LFCSP-40 thermal performance (θJA = 30.2 °C/W).

Technical Context

The ADRF6720ACPZ-R7 implements a direct-conversion I/Q modulator architecture with on-die polyphase filter for external 1× LO quadrature generation and divide-by-2 phase splitter for internal LO paths. Its fractional-N PLL uses a 38.4 MHz phase detector frequency and supports programmable charge pump currents (250–1000 µA) to optimize loop filter design across 700–2855 MHz LO coverage.

Baseband inputs accept 0.5 V DC-biased differential signals with >1000 MHz 1 dB bandwidth; RF output is single-ended via integrated balun. Digital control uses 3-wire SPI (SCLK/SDIO/CS) with register-mapped DACs for carrier feedthrough, sideband suppression, and HD3/IP3 calibration-enabling real-time correction without external components.

Key Specifications

Pinout & Package

ADRF6720ACPZ-R7 is housed in a 40-lead, 6 mm × 6 mm RoHS-compliant LFCSP package with exposed thermal pad soldered to PCB ground plane (θJA = 30.2 °C/W). Pin functions are validated per Analog Devices DS Rev. 0, Page 9–10.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADRF6720ACPZ-R7, ADRF6702ACPZ-R7 lacks integrated VCOs and has reduced RF bandwidth, while TRF372017IRGZT offers broader frequency coverage but requires external LO and consumes 22% more power-making ADRF6720ACPZ-R7 optimal for compact, self-contained LTE macrocell transmitters.

Availability

ADRF6720ACPZ-R7 is available at Aetrix Electronics and suitable for 4G/LTE base station development, microwave backhaul design, and satellite modem production requiring stable component supply, full RoHS compliance, and guaranteed long-term availability through 2030.

Supply support for ADRF6720ACPZ-R7 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 communications, industrial, and aerospace markets with precision signal processing solutions since 1965.

The ADRF6720ACPZ-R7 belongs to Analog Devices' RadioVerse™ portfolio of highly integrated RF transceivers and modulators, designed specifically for wireless infrastructure equipment requiring reduced size, power, and design complexity in 3G/4G/5G base stations.

FAQ

What is the maximum RF output frequency supported by the ADRF6720ACPZ-R7?

The ADRF6720ACPZ-R7 supports an RF output frequency range of 700 MHz to 3000 MHz, verified across temperature (−40°C to +85°C) and supply (3.15–3.45 V). This covers all LTE FDD/TDD bands (B1–B41), WiMAX, and unlicensed 2.4/5 GHz ISM bands. Operation above 3000 MHz is not characterized or guaranteed.

Does the ADRF6720ACPZ-R7 require external loop filter components when using the integrated PLL?

Yes, the ADRF6720ACPZ-R7 requires an external passive loop filter between CP (Pin 36) and VTUNE (Pin 32) to stabilize the fractional-N PLL. The datasheet provides reference designs for 20 kHz bandwidth filters; omitting this filter results in unstable LO output and excessive phase noise or spurs.

Can the ADRF6720ACPZ-R7 operate with an external LO instead of the internal synthesizer?

Yes, the ADRF6720ACPZ-R7 supports external LO injection via LOIN+/LOIN− (Pins 33/34) while disabling the internal PLL and VCOs. In this mode, supply current drops to 228 mA, and the device accepts −6 to +6 dBm differential LO input at 700–3000 MHz-ideal for systems with ultra-low-phase-noise external synthesizers.

How is carrier feedthrough corrected in the ADRF6720ACPZ-R7?

Carrier feedthrough in the ADRF6720ACPZ-R7 is corrected using two dedicated 8-bit DACs (DCOFF_I and DCOFF_Q) accessible via SPI registers. These inject calibrated DC offsets into the I and Q baseband paths to null residual LO leakage, achieving <−44 dBm feedthrough after calibration-critical for meeting spectral mask requirements in LTE.

What is the thermal resistance (θJA) of the ADRF6720ACPZ-R7 package?

The ADRF6720ACPZ-R7 in its 40-lead 6 mm × 6 mm LFCSP package has a measured junction-to-ambient thermal resistance (θJA) of 30.2 °C/W, per JEDEC JESD51-2. This value assumes proper PCB layout with the exposed pad soldered to a low-impedance ground plane and ≥4 thermal vias-essential for maintaining junction temperature below 125°C at full 425 mA load.