Texas Instruments TRF372017IRGZT

Overview

TRF372017IRGZT from Texas Instruments is a fully integrated IQ modulator with on-chip integer/fractional PLL and VCO, operating from 300 MHz to 4.8 GHz LO frequency, delivering 11.5 dBm P1dB, 26 dBm OIP3, –132 dBc/Hz phase noise at 1 MHz offset (2.3 GHz), and –160 dBm/Hz noise floor-used in LTE and WCDMA wireless infrastructure transceivers.

For engineers reviewing the TRF372017IRGZT datasheet, TRF372017IRGZT pinout, TRF372017IRGZT application, or TRF372017IRGZT equivalent, key selection considerations include its dual-path baseband interface (BBI_P/N, BBQ_P/N), SPI-controlled VCO tuning and DC offset calibration, integrated charge pump (CP_OUT), VTUNE input, and RFOUT/LO_OUT differential outputs for direct upconversion architectures.

Technical Context

The TRF372017IRGZT implements a high-linearity direct-conversion IQ modulator with internal 5-kΩ baseband input termination and programmable 8-bit DC offset D/A for carrier cancellation. Its PLL employs a fractional-N architecture with configurable PFD frequency up to 100 MHz and SPI-programmable charge pump current (1.94 mA typical).

The integrated VCO supports continuous tuning from 2.4–4.8 GHz, with on-chip dividers (÷1/÷2/÷4/÷8) enabling LO outputs from 300 MHz to 4.8 GHz. Baseband inputs accept 1-GHz bandwidth differential signals, and RF output is internally matched to 50 Ω with AC-coupled operation.

Key Specifications

Pinout & Package

TRF372017IRGZT is housed in a 48-pin VQFN package (7.0 mm × 7.0 mm, 0.5-mm pitch) with exposed thermal pad. Pin functions are validated per TI SLWS224E Rev E datasheet (January 2016), including dedicated analog/digital ground separation and multiple isolated power domains (VCC_VCO1/2, VCC_PLL, VCC_DIG, VCC_MIX, VCC_D2S).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar IQ modulator with integrated PLL/VCO applications.

Compared with ADRF6720-27 and LMX2594, the TRF372017IRGZT uniquely integrates both high-linearity IQ modulation and wideband fractional-N PLL/VCO in one die, reducing component count and layout complexity-ideal for cost-sensitive, space-constrained wireless infrastructure designs where full integration outweighs marginal performance trade-offs.

Availability

TRF372017IRGZT is available at Aetrix Electronics and suitable for wireless infrastructure transmitters, point-to-point microwave radios, and TD-LTE small cell base stations requiring stable component supply, long-term manufacturability, and consistent RF performance across production batches.

Supply support for TRF372017IRGZT 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 for industrial, automotive, and communications markets.

The TRF372017IRGZT belongs to TI's RF silicon portfolio designed specifically for wireless infrastructure applications-emphasizing integration, linearity, and thermal robustness in high-density macrocell and small-cell radio designs.

FAQ

What is the maximum reference input frequency supported by the TRF372017IRGZT?

The TRF372017IRGZT supports reference input frequencies up to 160 MHz, as specified in the Electrical Characteristics table under "Reference oscillator parameters." This allows direct use of common TCXO or crystal oscillator sources without prescaling, simplifying clock tree design in LTE and WCDMA base stations. The device maintains PLL lock stability and low phase noise even at the upper limit of this range.

Does the TRF372017IRGZT support external LO injection?

Yes, the TRF372017IRGZT supports external LO injection via the EXT_VCO pin (Pin 36), which accepts high-impedance, AC-coupled signals. When enabled, the internal VCO is disabled and the external LO drives the modulator directly-enabling hybrid architectures where ultra-low-noise external synthesizers replace the on-chip VCO for demanding applications like microwave backhaul.

How does the power-save (PS) mode affect VCO lock status in the TRF372017IRGZT?

In power-save mode (PS = high), the TRF372017IRGZT disables non-critical bias circuits while maintaining VCO lock via the charge pump and loop filter, allowing sub-100-µs wake-up to full operation. Total supply current drops from 367 mA (LO on) to 117 mA, making it ideal for TDD systems where rapid TX/RX switching is required without reacquiring lock.

What baseband interface configuration does the TRF372017IRGZT require for optimal I/Q balance?

The TRF372017IRGZT requires differential AC-coupled baseband inputs (BBI_P/N and BBQ_P/N) with 100-Ω termination when internal VCM is used. Input impedance is fixed at 5 kΩ || 3 pF per pin, and the 8-bit programmable DC offset D/A enables fine-tuning of I/Q common-mode and differential offsets to achieve <0.5° phase and <0.1-dB gain matching-critical for <–40 dBc carrier suppression.

Can the TRF372017IRGZT generate LO frequencies below 300 MHz?

No, the TRF372017IRGZT's VCO operates from 2.4–4.8 GHz, and its integrated dividers (÷1/÷2/÷4/÷8) yield minimum LO output of 300 MHz (4.8 GHz ÷16 is not supported). For sub-300 MHz LO generation, an external divider or separate synthesizer is required-TI documentation confirms 300 MHz as the absolute lower bound for LO_OUT functionality in all operating modes.