Texas Instruments TRF372017IRGZR

Overview

TRF372017IRGZR 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 (fVCO = 2.3 GHz), and –160 dBm/Hz noise floor - used in LTE and WCDMA wireless infrastructure transceivers.

For engineers reviewing the TRF372017IRGZR datasheet, TRF372017IRGZR pinout, TRF372017IRGZR application, or TRF372017IRGZR 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), and RFOUT/LO_OUT differential outputs supporting external or internal LO architectures.

Technical Context

The TRF372017IRGZR integrates a high-linearity IQ modulator with a wide-tuning-range VCO (2.4–4.8 GHz) and programmable RF dividers (÷1/2/4/8), enabling direct upconversion across cellular and broadband wireless bands. Its PLL supports both integer and fractional-N modes with configurable PFD frequency up to 100 MHz and SPI-programmable charge pump current (1.94 mA typical).

Baseband inputs accept differential I/Q signals with internal 1.7-V common-mode generation and 8-bit D/A-controlled DC offset adjustment; RF output is internally matched to 50 Ω, while LO outputs (LO_OUT_P/N) are open-collector requiring external pull-ups. Power-save mode (PS pin) maintains VCO lock while reducing supply current by >50%.

Key Specifications

Pinout & Package

TRF372017IRGZR 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 defined per TI SLWS224E Rev E datasheet.

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, TRF372017IRGZR uniquely combines full RF signal generation (VCO + PLL + modulator) in one die, enabling faster time-to-market for sub-6-GHz wireless infrastructure with minimal external components and proven WCDMA/LTE performance.

Availability

TRF372017IRGZR is available at Aetrix Electronics and suitable for wireless infrastructure, point-to-point backhaul, and broadband transceiver designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for telecom-grade deployments.

Supply support for TRF372017IRGZR 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 technologies, with decades of RF IC innovation for communications infrastructure.

The TRF372017IRGZR belongs to TI's high-performance RF silicon modulator product line, designed specifically for cost-sensitive, high-volume wireless base station and repeater applications demanding integrated LO synthesis and robust modulation fidelity.

FAQ

What is the maximum reference input frequency supported by the TRF372017IRGZR?

The TRF372017IRGZR supports reference input frequencies up to 160 MHz at the REFIN pin, as specified in the Electrical Characteristics table (Section 6.4). This allows direct use of common TCXO or crystal oscillator sources without prescaling, simplifying clock tree design for LTE and WCDMA base stations. The TRF372017IRGZR maintains PLL lock stability and low phase noise across this full range when configured with appropriate loop filter parameters.

Does the TRF372017IRGZR support external VCO injection, and how is it configured?

Yes, the TRF372017IRGZR supports external LO injection via the EXT_VCO pin, which accepts high-impedance AC-coupled signals. When enabled, the internal VCO is disabled and the device operates as an IQ modulator only, using the external signal as the LO source. Configuration is done through SPI register bits (e.g., EN_EXT_VCO), and the TRF372017IRGZR retains full baseband DC offset control and gain calibration functionality in this mode.

How does the power-save (PS) mode affect VCO lock and startup time in the TRF372017IRGZR?

In PS mode (PS pin high), the TRF372017IRGZR disables non-critical bias circuits while maintaining VCO lock and PLL state, reducing total supply current by >50%. Startup time from PS mode to full operation is <10 µs - significantly faster than cold start - because the VCO remains tuned and locked. This behavior makes the TRF372017IRGZR ideal for TDD-LTE and burst-mode wireless systems requiring rapid RF activation.

What is the function of the RDBK pin on the TRF372017IRGZR, and how is it used?

The RDBK pin on the TRF372017IRGZR provides serial readback of internal register contents during SPI communication. It outputs 32-bit register data synchronized to the CLK signal after LE assertion, allowing firmware to verify configuration writes or debug initialization sequences. Unlike standard SPI MISO, RDBK operates in a dedicated readback phase and requires precise timing alignment per Section 6.6 of the TRF372017IRGZR datasheet.

Can the TRF372017IRGZR generate its own baseband common-mode voltage, and what are the options?

Yes, the TRF372017IRGZR can generate a 1.7-V internal common-mode voltage (VCM) for its BBI_P/N and BBQ_P/N inputs, eliminating the need for external bias networks. This is selected via the PWD_BB_VCM bit in SPI register 0. Alternatively, an external VCM (1.6–1.85 V) may be applied - providing flexibility for systems with existing bias rails or custom DC offset requirements. Both modes support 8-bit programmable DC offset correction.