Analog Devices Inc. ADRF6704ACPZ-R7

Overview

ADRF6704ACPZ-R7 from Analog Devices is a highly integrated RF quadrature modulator with fractional-N PLL and VCO, operating across 2050–3000 MHz RF output and 2500–2900 MHz internal LO ranges. It delivers 12.1 dBm P1dB and −158.3 dBm/Hz noise floor at 2700 MHz, supporting LTE/W-CDMA base stations and broadband wireless access transmitters.

For engineers reviewing the ADRF6704ACPZ-R7 datasheet, ADRF6704ACPZ-R7 pinout, ADRF6704ACPZ-R7 application, or ADRF6704ACPZ-R7 equivalent, key selection criteria include RF output linearity (OIP3 = 27.2 dBm), integrated PLL phase noise (−126.1 dBc/Hz @ 1 MHz offset), baseband bandwidth (750 MHz), and SPI-programmable charge pump current (250–1000 µA).

Technical Context

The ADRF6704ACPZ-R7 integrates a high-linearity IQ modulator, sigma-delta fractional-N PLL, and low-phase-noise SiGe BiCMOS VCO in a single die. Its architecture generates a 2×fLO signal for quadrature upconversion while using an external loop filter to control VTUNE and suppress reference spurs via Σ-Δ modulation of the N-divider.

It supports both internal LO synthesis and external 2×LO injection via LOP/LON pins, with configurable LO path (1× or 2× output) and modulator output enable/disable via ENOP. Baseband inputs (IP/IN/QP/QN) are differential, dc-biased to 500 mV, and support complex IF or direct-conversion architectures up to 750 MHz bandwidth.

Key Specifications

Pinout & Package

ADRF6704ACPZ-R7 is housed in a 40-lead, 6 mm × 6 mm exposed-paddle LFCSP package. The exposed paddle must be soldered to a low-impedance ground plane per JEDEC standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar quadrature modulator with integrated synthesizer applications.

Compared with ADRF6703ACPZ-R7, the ADRF6704ACPZ-R7 extends usable RF output to 3000 MHz and improves OIP3 by 1.8 dBm at 2700 MHz; versus TRF372017IRGZT, it reduces component count by integrating PLL/VCO but trades off frequency agility outside its native band.

Availability

ADRF6704ACPZ-R7 is available at Aetrix Electronics and suitable for cellular infrastructure, broadband wireless access systems, and satellite modem designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for ADRF6704ACPZ-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 is a global leader in high-performance analog, mixed-signal, and RF ICs, serving communications, industrial, automotive, and aerospace markets with precision signal processing solutions.

The ADRF6704ACPZ-R7 belongs to Analog Devices' RF transceiver and modulator product line, designed specifically for high-efficiency, high-linearity wireless infrastructure transmitters requiring integrated synthesis and wide instantaneous bandwidth.

FAQ

What is the maximum baseband input frequency supported by the ADRF6704ACPZ-R7?

The ADRF6704ACPZ-R7 supports a 750 MHz 3 dB baseband bandwidth, verified across IP/IN/QP/QN inputs with 1 V_p-p differential sine waves and 500 mV dc bias. This enables direct sampling of wideband waveforms such as 100 MHz 5G NR channels without external IF filtering. Performance remains flat within ±0.5 dB up to 350 MHz and degrades gradually beyond that point.

Does the ADRF6704ACPZ-R7 require external loop filter components?

Yes, the ADRF6704ACPZ-R7 requires an external third-order loop filter between CP and VTUNE pins to stabilize the fractional-N PLL. The datasheet specifies a 130 kHz loop bandwidth design using standard RC-LC topologies. No internal loop filter is integrated; omission results in unstable VCO tuning and failed lock detection.

Can the ADRF6704ACPZ-R7 operate with an external LO instead of its internal VCO?

Yes, the ADRF6704ACPZ-R7 supports external 2×LO injection via LOP/LON pins when LOSEL is set low and LDRV/LXL bits in Register 5 are configured accordingly. In this mode, internal VCO and PLL are disabled, reducing supply current from 226 mA to 135 mA while retaining full IQ modulation functionality.

What is the purpose of the MUXOUT pin on the ADRF6704ACPZ-R7?

The MUXOUT pin on the ADRF6704ACPZ-R7 serves three selectable functions via Register 4: digital lock detect output, voltage proportional to absolute temperature (VPTAT = 1.579 V @ 25°C, 3.8 mV/°C), or buffered reference signal. This eliminates need for external sensors or status monitoring ICs in thermally managed RF systems.

How does the ENOP pin affect RF output behavior in the ADRF6704ACPZ-R7?

The ENOP pin on the ADRF6704ACPZ-R7 is an active-high digital control that disables the RFOUT driver stage when logic low. When disabled, RFOUT presents high impedance and draws only 22 mA total supply current-ideal for fast Tx/Rx switching in TDD systems or power-saving calibration sequences.