Texas Instruments TRF3722IRGZT

Overview

TRF3722IRGZT from Texas Instruments is a highly integrated quadrature modulator with on-chip integer-N/fractional-N PLL and VCO, operating as the RF transmit front-end core in wireless infrastructure base stations. It delivers 31 dBm OIP3 at 900 MHz, supports 400–4200 MHz RF output, features independent LO outputs (÷1/2/4/8), and enables seamless DAC interfacing via 0.25-V BB common-mode voltage. Used in LTE Advanced and TD-LTE macro base station transceivers.

For engineers reviewing the TRF3722IRGZT datasheet, TRF3722IRGZT pinout, TRF3722IRGZT application, or TRF3722IRGZT equivalent, key selection criteria include its integrated PLL/VCO phase noise performance (–141 dBc/Hz @ 1 MHz offset at 1800 MHz), dual-mode gain control (0.8 dB typical / +3.6 dB high-gain), RFOUT return loss ≥6 dB, and support for external VCO injection up to 4200 MHz.

Technical Context

The TRF3722IRGZT implements a direct-conversion IQ modulator architecture with fully differential baseband inputs (BBI_P/N, BBQ_P/N) and a high-linearity RF mixer core. Its integrated PLL employs a charge-pump-based PFD with programmable loop bandwidth and supports both integer-N and fractional-N synthesis for flexible frequency planning across 280–4100 MHz VCO range.

The device integrates four independent power domains-VCC_DIG (3.3 V), VCC_PLL (3.3 V), VCC_MODx (3.3 V ×4), and VCC_TK (3.3/5 V)-enabling precise bias optimization per functional block. The LO divider chain provides differential LO_OUTP/N outputs with selectable division ratios, while the serial interface (DATA/CLK/LE) allows full register configuration of modulation mode, power states, and PLL parameters.

Key Specifications

Pinout & Package

TRF3722IRGZT is housed in a 48-pin VQFN package (7.0 mm × 7.0 mm, 0.5-mm pitch) with exposed thermal pad. Pin assignment follows TI's RGZ footprint, supporting automated optical inspection and high-frequency signal integrity via ground-sparse routing and dedicated power planes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADRF6720-27ACPZ-R7 and LMX2594RHAR, TRF3722IRGZT uniquely combines modulator, PLL, and VCO in one die-reducing component count, simplifying layout, and guaranteeing co-design performance-but trades off absolute OIP3 and VCO tuning range for integration density and ease of use.

Availability

TRF3722IRGZT is available at Aetrix Electronics and suitable for wireless infrastructure, microwave backhaul, and SDR development requiring stable component supply, long-term lifecycle support, and traceable sourcing for FCC/CE-certified deployments.

Supply support for TRF3722IRGZT 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions, with deep expertise in RF and mixed-signal design for communications infrastructure.

The TRF3722IRGZT belongs to TI's high-performance RF silicon portfolio, engineered specifically for next-generation wireless base stations demanding integrated, low-phase-noise, wideband transmit solutions.

FAQ

What is the RF output frequency range supported by the TRF3722IRGZT?

The TRF3722IRGZT supports an RF output frequency range of 400 MHz to 4200 MHz. This covers all major licensed cellular bands including 700 MHz (Band 12/13/14), 800 MHz (Band 5/20), 1800 MHz (Band 3), 2100 MHz (Band 1), 2600 MHz (Band 7), and 3500 MHz (n78). Operation is verified across this full range with specified OIP3, gain flatness, and phase noise performance.

Does the TRF3722IRGZT include an integrated VCO, and what is its tuning range?

Yes, the TRF3722IRGZT integrates a VCO with a typical frequency range of 2050 MHz to 4100 MHz. The VCO is controlled via the VTUNE pin with a gain (KV) of 30 MHz/V at VTUNE = 1.1 V. Open-loop phase noise is characterized at multiple frequencies, including –141 dBc/Hz @ 1 MHz offset for fVCO = 3600 MHz with TX Div = ÷2.

How does the TRF3722IRGZT handle baseband interface compatibility with DACs?

The TRF3722IRGZT accepts differential baseband inputs (BBI_P/N, BBQ_P/N) with a nominal common-mode voltage of 0.25 V, matching the output of standard current-source DACs such as the DAC38J84. Its 5-kΩ input resistance and 4-pF capacitance are optimized for direct coupling without AC-coupling or level-shifting circuitry, reducing component count and preserving I/Q balance.

What power supply configurations does the TRF3722IRGZT require?

The TRF3722IRGZT requires five distinct supply rails: VCC_DIG (3.3 V), VCC_PLL (3.3 V), four VCC_MODx rails (3.3 V each), and VCC_TK (3.3 V or 5 V for VCO tank). Each domain is separately decoupled to minimize noise coupling. Total supply current is 374 mA at 3.3 V with LO enabled, and power dissipation reaches 1.34 W in typical operating mode.

Can the TRF3722IRGZT operate with an external LO instead of its internal VCO?

Yes, the TRF3722IRGZT supports external LO injection via the EXT_VCO pin, accepting signals from 250 MHz to 4200 MHz at –10 dBm to +10 dBm. When used, the internal VCO and PLL are bypassed, and the device functions as a pure IQ modulator driven by an external synthesizer-enabling hybrid architectures or reuse of existing LO sources.