Texas Instruments TRF3702IRHCG4

Overview

TRF3702IRHCG4 from Texas Instruments is a 1.5 GHz to 2.5 GHz silicon germanium quadrature modulator designed for direct RF upconversion in wireless transmit chains. It delivers 7 dBm P1dB output power, achieves 71 dBc WCDMA ACPR at –14-dBm channel power, and provides unadjusted carrier and sideband suppression of 35 dBc at 2 GHz - enabling high-linearity baseband-to-RF signal synthesis in cellular BTS and wideband transceivers.

For engineers reviewing the TRF3702IRHCG4 datasheet, TRF3702IRHCG4 pinout, TRF3702IRHCG4 application, or TRF3702IRHCG4 equivalent, key selection criteria include its differential/single-ended I/Q input flexibility, single-ended LO interface, 16-pin QFN (RHC) package, and performance across –40°C to +85°C with 5 V supply.

Technical Context

The TRF3702IRHCG4 implements a double-balanced mixer architecture with an integrated LO phase splitter, eliminating external baluns. Its I/Q inputs (IVIN/IREF/QVIN/QREF) accept either differential or single-ended signals referenced to a 3.7 V common-mode voltage (VCM), while the RF output (RFOUT) is AC-coupled and optimized for 50 Ω loads.

Carrier and sideband suppression are tunable via DC offset adjustment on all four baseband inputs; typical unadjusted values are 35 dBc, improving to 55 dBc after optimization. The device supports WCDMA, CDMA2000, LTE-adjacent standards, and operates with LO input power from –6 dBm to +6 dBm across its full 1.5–2.5 GHz RF range.

Key Specifications

Pinout & Package

TRF3702IRHCG4 is housed in a 4-mm × 4-mm, 16-pin QFN package (RHC) with exposed thermal pad. Pin 1 is located at top-left per JEDEC MO-220 standard; pins are numbered counter-clockwise. Ground pins (1, 2, 3, 5, 9, 11, 12) provide low-inductance return paths critical for RF integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADL5375-05ACPZ-R7 and MAX2022ETX+, the TRF3702IRHCG4 offers superior WCDMA ACPR and simpler single-supply/single-ended LO operation - making it optimal for high-performance, discrete-LO cellular BTS and wideband IF sampling systems.

Availability

TRF3702IRHCG4 is available at Aetrix Electronics and suitable for cellular base station development, wireless LAN access point design, and LMDS fixed wireless infrastructure requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TRF3702IRHCG4 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 and broad manufacturing scale.

The TRF3702IRHCG4 belongs to TI's high-performance RF modulator product line, engineered specifically for demanding wireless infrastructure applications including 3G/4G base stations, microwave backhaul, and wideband transceivers.

FAQ

What is the recommended common-mode voltage (VCM) for TRF3702IRHCG4 I/Q inputs?

The TRF3702IRHCG4 specifies a nominal VCM of 3.7 V for all four baseband inputs (IVIN, IREF, QVIN, QREF). This voltage must be supplied externally and tightly regulated; deviation beyond ±0.1 V degrades carrier suppression. The device's performance curves (e.g., Figure 10–12) confirm optimal suppression occurs at 3.7 V across temperature and supply variations. TRF3702IRHCG4 datasheet Section 6.5 confirms this value under Recommended Operating Conditions.

Does TRF3702IRHCG4 support single-ended I/Q drive without external components?

Yes - TRF3702IRHCG4 accepts single-ended I/Q signals by applying the 3.7 V VCM to IREF and QREF while driving IVIN and QVIN with AC-coupled signals. No external resistors or active circuitry are required for basic operation. However, for best carrier suppression (>50 dBc), fine DC offset trimming at the I/Q inputs is recommended. TRF3702IRHCG4 Application Information (Section 9.2) explicitly validates this configuration.

What is the thermal resistance (RθJA) of TRF3702IRHCG4, and how does it impact PCB layout?

The TRF3702IRHCG4 has a junction-to-ambient thermal resistance (RθJA) of 42.8°C/W when mounted on a four-layer JEDEC board with four thermal vias under the exposed pad. This value assumes proper soldering of the thermal pad to inner ground planes. Layout must include ≥4 thermal vias (0.3 mm diameter) connecting the pad to internal ground layers; insufficient copper or via count raises junction temperature and degrades RF performance. TRF3702IRHCG4 Thermal Characteristics table (Page 5) specifies this condition.

Can TRF3702IRHCG4 be used outside its specified 1.5–2.5 GHz RF range?

No - TRF3702IRHCG4 is characterized and guaranteed only from 1.5 GHz to 2.5 GHz. Performance parameters (e.g., carrier suppression, ACPR, output power) degrade significantly outside this band: RFOUT impedance shifts (Table 1 shows Z = 82 – j5.8 Ω at 2.5 GHz vs. 31 – j4.7 Ω at 1.5 GHz), and LO input matching deteriorates. TI does not specify or guarantee operation below 1.5 GHz or above 2.5 GHz. TRF3702IRHCG4 Absolute Maximum Ratings and RF Output Performance sections restrict usage to this band.

How does power-down mode affect TRF3702IRHCG4 RF output and settling time?

When PWD is pulled low, TRF3702IRHCG4 reduces total supply current from 170 mA to 30 mA and suppresses RFOUT by >35 dB. Turnoff time is 20 ns; turnon time is 120 ns - enabling rapid TDD switching in time-division duplex systems. During power-down, the internal mixers and output amplifier are disabled, but baseband input bias remains active to preserve DC offset calibration. TRF3702IRHCG4 Electrical Characteristics table (Page 3) quantifies these timing and current values.