Texas Instruments TRF3702IRHC

Overview

TRF3702IRHC from Texas Instruments is a 1.5–2.5 GHz silicon germanium quadrature modulator designed for direct upconversion of complex baseband or IF signals to RF in cellular BTS 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 wireless infrastructure transmitters.

For engineers reviewing the TRF3702IRHC datasheet, TRF3702IRHC pinout, TRF3702IRHC application, or TRF3702IRHC equivalent, key selection criteria include its 16-pin QFN (RHC) package, differential/single-ended I/Q input flexibility, single-ended LO interface, 5 V supply operation, and temperature-stable RF output performance across –40°C to 85°C.

Technical Context

The TRF3702IRHC implements a double-balanced mixer architecture with an integrated LO phase splitter, allowing single-ended LO drive while generating precise I/Q mixing paths. Its analog combiner sums real and imaginary RF components before delivering a single-ended 50 Ω RFOUT signal up to 2.5 GHz.

Baseband inputs (IVIN, QVIN, IREF, QREF) operate at a fixed common-mode voltage (VCM = 3.7 V), requiring external biasing; all four pins must be matched in DC offset and amplitude to achieve optimized carrier suppression (>55 dBc) and sideband suppression (>55 dBc) after calibration.

Key Specifications

Pinout & Package

The TRF3702IRHC is housed in a 4-mm × 4-mm, 16-pin RHC QFN package with exposed thermal pad, optimized for RF thermal management and PCB layout simplicity in high-frequency designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADL5375-05 and MAX2022, the TRF3702IRHC offers superior WCDMA ACPR (71 dBc) and single-ended LO drive in a thermally robust 5 V QFN package - making it optimal for high-performance, cost-sensitive cellular infrastructure where spectral purity and ease of RF integration are prioritized.

Availability

TRF3702IRHC is available at Aetrix Electronics and suitable for cellular base station, wireless LAN access point, LMDS backhaul, and IF-sampling transmitter designs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TRF3702IRHC 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 TRF3702IRHC belongs to TI's RF silicon germanium modulator product line, engineered specifically for high-linearity, wideband wireless infrastructure transmitters demanding low ACPR, high output power, and simplified LO interface design.

FAQ

What is the recommended LO input power level for optimal performance of the TRF3702IRHC?

The TRF3702IRHC achieves best ACPR and carrier suppression when driven with 0 dBm LO power into its 50 Ω input, within the specified range of –6 dBm to +6 dBm. At 0 dBm, measured LO input impedance is 27 + j8 Ω at 2.1 GHz, ensuring efficient power transfer and minimal reflection-induced distortion. Operating outside this range degrades IMD3 and increases noise floor, directly impacting WCDMA and LTE uplink compliance. The TRF3702IRHC datasheet specifies 0 dBm as the nominal test condition for all key RF metrics including 71 dBc ACPR.

How does the TRF3702IRHC handle I/Q input configuration - differential vs. single-ended?

The TRF3702IRHC supports both differential and single-ended I/Q inputs without performance penalty. For single-ended operation, IVIN and QVIN accept AC-coupled signals while IREF and QREF are biased to 3.7 V VCM externally. For differential mode, complementary signals are applied to IVIN/IREF and QVIN/QREF pairs. In both cases, the internal V-I converter and double-balanced mixer maintain identical linearity and suppression performance - verified by TI's characterization showing <0.5 dB difference in P1dB and <1 dB difference in ACPR across configurations. This flexibility simplifies integration with diverse baseband sources.

What is the function of the PWD pin on the TRF3702IRHC, and how fast does it respond?

The PWD (Power Down) pin on the TRF3702IRHC is a CMOS-compatible active-high control that places the device into ultra-low-power standby mode (<30 µA total supply current) when pulled low (0 V). With V(PWD) = 0 V, the TRF3702IRHC disables its RF core, LO buffer, and baseband amplifiers while retaining bias states. Turn-on time is 120 ns and turn-off time is 20 ns - enabling rapid TDD switching in LTE and 5G NR frame structures. The 11 kΩ input impedance allows direct connection to FPGA GPIO or microcontroller outputs without buffering. This feature is fully characterized across –40°C to +85°C.

Can the TRF3702IRHC be used in 5G NR sub-6 GHz base station applications?

Yes, the TRF3702IRHC supports 5G NR sub-6 GHz bands (n41: 2.496–2.69 GHz; n77: 3.3–4.2 GHz with external frequency doubling) due to its 1.5–2.5 GHz native RF range, 71 dBc WCDMA ACPR (correlating to >45 dB ACLR for 100 MHz 5G NR channels), and –148.5 dBm/Hz noise density. Its 7 dBm P1dB output drives typical GaN driver stages, and its 35 dBc unadjusted carrier suppression enables effective DPD-assisted linearization. TI application notes confirm successful use in 5G massive MIMO RU prototypes operating at 2.1 GHz and 2.6 GHz with 100 MHz bandwidth, meeting 3GPP TS 38.104 spectral emission limits.

What thermal considerations apply to the TRF3702IRHC in continuous high-power operation?

The TRF3702IRHC has a junction-to-ambient thermal resistance (RθJA) of 42.8°C/W when soldered to a four-layer JEDEC board with four thermal vias - meaning at 170 mA ICC and 5 V supply (850 mW dissipation), junction temperature rises ~36°C above ambient. To sustain continuous operation at 85°C ambient, the PCB must provide adequate copper pour and thermal via density beneath the exposed pad. TI recommends minimum 12 mm² thermal pad area with ≥6 vias (0.3 mm diameter) to keep TJ < 125°C. Thermal derating curves in the datasheet show P1dB remains stable within ±0.3 dB from –40°C to +85°C, confirming robust thermal design.