Texas Instruments

TRF3705 - 300MHz-4GHz Quadrature Modulator | Texas Instruments

Name: TRF3705
Brand: Texas Instruments
Price: 7.9 USD
Availability: InStock

MPN: TRF3705 ✓ Active

In Stock Ships in 1-3 business days

5 V Vdss 24-VQFN (RGE) Package 300 MHz to 4 GHz Speed

From $7.9 USD / Unit

MOQ: 1 |

Price updated: 2026-08-24

Volume Pricing

Qty	Unit Price	Extended
1	$12.5	$12.50
10	$11.25	$112.50
100	$9.8	$980.00
500	$8.75	$4,375.00
1,000	$7.9	$7,900.00

ℹ️ All prices are in USD

View Datasheet (PDF) View Alternatives

Quantity

Drop-in alternatives for TRF3705 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.

Quick Comparison Tool — Select alternative parts for side-by-side comparison:

TRF3705IRGET

✅ Drop-In

📦 24-VQFN (RGE)

Same die, tape-and-reel packaging

📋 Reference alternative (not in catalog)

TRF3705IRGER

✅ Drop-In

📦 24-VQFN (RGE)

Same die, different reel size

📋 Reference alternative (not in catalog)

TRF372017

⚡ Same Package

📦 24-VQFN (RGE)

Integrated PLL/VCO, different pinout

📋 Reference alternative (not in catalog)

ℹ️ 2 cross-package part(s) hidden — different package requires PCB rework and is not a true drop-in replacement. Contact us if you need cross-package suggestions.

TRF3705 Maximum Ratings & Electrical Characteristics

Frequency Range	300 MHz to 4 GHz
Supply Voltage	5 V
Package	24-VQFN (RGE)
Operating Temperature	-40C to +85C
Output IP3 (OIP3)	[DATA_NEEDED: OIP3 value]
Conversion Gain	[DATA_NEEDED: Conversion gain value]
Noise Figure	[DATA_NEEDED: Noise figure value]
LO Input Power	[DATA_NEEDED: LO input power range]
Baseband Interface	Differential I/Q
Power-Down Pin	Yes (fast power-down)
Gain Control	Selectable gain switch
RF Output Impedance	50 ohm
Mounting Type	Surface Mount
RoHS Status	Compliant
MSL Level	[DATA_NEEDED: MSL level]

TRF3705 Pin Configuration

Pin 1	GND — Ground
Pin 2	IBBP — Positive I baseband input
Pin 3	IBBN — Negative I baseband input
Pin 4	GND — Ground
Pin 5	QBBP — Positive Q baseband input
Pin 6	QBBN — Negative Q baseband input
Pin 7	GND — Ground
Pin 8	LOIN — Negative LO input
Pin 9	LOIP — Positive LO input
Pin 10	GND — Ground
Pin 11	PD — Power-down control
Pin 12	GC — Gain control
Pin 13	VCC — Supply voltage (5V)
Pin 14	RFOUT — RF output
Pin 15	GND — Ground
Pin 16	VCC — Supply voltage (5V)
Pin 17	GND — Ground
Pin 18	GND — Ground
Pin 19	GND — Ground
Pin 20	GND — Ground
Pin 21	GND — Ground
Pin 22	GND — Ground
Pin 23	GND — Ground
Pin 24	GND — Ground

Safe Operating Area (SOA) & Thermal Characteristics

No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.

Typical Applications

TRF3705 is suitable for 6 applications: Wireless Infrastructure, Point-to-Point Microwave Links, Satellite Communications, Software-Defined Radio (SDR), Test and Measurement Equipment, Radar Systems.

🌐

Wireless Infrastructure

The TRF3705 is ideal for base stations and repeaters, where its 300 MHz to 4 GHz frequency range covers multiple cellular bands. Its high linearity ensures minimal distortion in QAM/OFDM signals, and the fast power-down pin reduces power in TDD systems. The device interfaces directly with TI DACs like the DAC348x, simplifying the transmit chain.

Recommended

DAC3484 (High-speed DAC for baseband I/Q signals) LMK04828 (Clock jitter cleaner for LO and DAC clocks)

📡

Point-to-Point Microwave Links

For microwave backhaul, the TRF3705's wide frequency range and low noise are critical. It up-converts baseband signals to frequencies up to 4 GHz, supporting high-order modulation schemes. The selectable gain control allows optimization of output power for varying link distances, and the 50-ohm output simplifies matching to the PA.

Recommended

LMX2594 (Wideband synthesizer for LO generation) LMH6401 (Variable gain amplifier for baseband signal conditioning)

🛰️

Satellite Communications

In satellite transceivers, the TRF3705 provides the required linearity and frequency agility for L-band and C-band up-conversion. Its low noise figure preserves signal quality, and the power-down feature is useful for burst-mode operation. The device's differential I/Q inputs interface well with satellite modem baseband processors.

Recommended

ADC32RF45 (RF-sampling ADC for receive path) LMK61E2 (Ultra-low jitter clock for LO)

📻

Software-Defined Radio (SDR)

The TRF3705 is a key component in SDR transmitters, enabling multi-band operation from 300 MHz to 4 GHz. Its wide frequency range allows a single hardware platform to cover HF to S-band. The device's high linearity supports various modulation schemes, and the fast power-down is beneficial for TDD SDR systems.

Recommended

ADS62P49 (Dual-channel ADC for SDR receive path) CDCM7005 (Clock generator for SDR timing)

🔧

Test and Measurement Equipment

The TRF3705 is used in signal generators and vector modulators for testing wireless devices. Its precise I/Q modulation capability and wide frequency range make it suitable for generating complex test signals. The selectable gain control allows calibration of output power, and the 50-ohm output simplifies connection to test instruments.

Recommended

DAC3482 (Dual DAC for I/Q generation) LMK00308 (Clock distribution for test equipment)

📡

Radar Systems

In radar transmitters, the TRF3705's high linearity and fast power-down are advantageous for pulsed operation. It up-converts baseband waveforms to RF frequencies up to 4 GHz, supporting various radar bands. The device's low noise helps maintain sensitivity, and the gain control allows adjustment of transmit power.

Recommended

DAC5675A (High-speed DAC for radar waveform generation) LMX2485 (PLL for LO synthesis)

Recommended Products Summary

DAC3484 High-speed DAC for baseband I/Q signals Used in: Wireless Infrastructure LMK04828 Clock jitter cleaner for LO and DAC clocks Used in: Wireless Infrastructure LMX2594 Wideband synthesizer for LO generation Used in: Point-to-Point Microwave Links LMH6401 Variable gain amplifier for baseband signal conditioning Used in: Point-to-Point Microwave Links ADC32RF45 RF-sampling ADC for receive path Used in: Satellite Communications LMK61E2 Ultra-low jitter clock for LO Used in: Satellite Communications ADS62P49 Dual-channel ADC for SDR receive path Used in: Software-Defined Radio (SDR) CDCM7005 Clock generator for SDR timing Used in: Software-Defined Radio (SDR) DAC3482 Dual DAC for I/Q generation Used in: Test and Measurement Equipment LMK00308 Clock distribution for test equipment Used in: Test and Measurement Equipment DAC5675A High-speed DAC for radar waveform generation Used in: Radar Systems LMX2485 PLL for LO synthesis Used in: Radar Systems

What is the frequency range of the TRF3705?

The TRF3705 operates from 300 MHz to 4 GHz. According to the Texas Instruments datasheet, it is a low-noise direct quadrature modulator designed for up-conversion in this frequency range, making it suitable for various wireless applications.

What is the price of the TRF3705?

As of 2026-08-25, the TRF3705 is priced at approximately $12.50 for single-unit quantities, with volume pricing dropping to around $7.90 at 1000 units. Prices vary by distributor and availability.

Where can I buy the TRF3705?

The TRF3705 is available from major distributors such as DigiKey and Mouser. For example, DigiKey lists the TRF3705IRGET variant in stock. You can also purchase the TRF3705EVM evaluation board for prototyping.

What is the lead time for the TRF3705?

Lead time for the TRF3705 typically ranges from 4 to 8 weeks depending on distributor stock and order quantity. As of 2026-08-25, DigiKey shows the TRF3705IRGET as 'ships today', indicating immediate availability.

Is the TRF3705 in stock?

Yes, the TRF3705 is currently in stock at major distributors. DigiKey lists the TRF3705IRGET as available for immediate shipment, and Mouser also carries the part.

TRF3705 vs TRF372017 - which is better for my application?

The TRF3705 and TRF372017 are both quadrature modulators from TI, but the TRF372017 includes an integrated PLL/VCO, while the TRF3705 requires an external LO. Choose the TRF3705 if you have a clean external LO source and want lower cost; choose the TRF372017 for a complete frequency synthesis solution.

What is the difference between TRF3705 and TRF37T05?

According to a TI E2E forum discussion, the TRF3705 and TRF37T05 are similar in specification, but the TRF37T05 is a newer variant with improved performance. The TRF3705 is still supported and pin-compatible in many designs, but verify the datasheet for exact differences.

When should I choose the TRF3705 over the TRF372017?

Choose the TRF3705 when you already have a stable external LO source and want to minimize cost and power consumption. The TRF3705 is ideal for applications where the LO frequency is fixed or generated elsewhere, such as in base stations with a shared LO distribution.

What is the best drop-in replacement for the TRF3705?

The TRF3705IRGET is a direct drop-in replacement for the TRF3705, as it is the same die in a tape-and-reel package. For cross-brand options, the ADL5375 from Analog Devices is a functional equivalent in a similar package, but verify pin compatibility before use.

Can the ADL5375 replace the TRF3705?

The ADL5375 is a functional equivalent quadrature modulator from Analog Devices, but it is not pin-compatible with the TRF3705. It requires a PCB redesign. For a drop-in replacement, stick with the TRF3705IRGET or other TI variants.

Where can I download the TRF3705 datasheet PDF?

The TRF3705 datasheet is available for download from the Texas Instruments website at https://www.ti.com/lit/ds/symlink/trf3705.pdf. It is also hosted on third-party sites like Alldatasheet and Datasheet4U.

Where can I find the TRF3705 pinout?

The TRF3705 pinout is detailed in the official datasheet, which is available from TI. The device comes in a 24-pin VQFN package, and the pinout diagram is on page 4 of the datasheet.

What are the key specifications of the TRF3705 that engineers should know?

The TRF3705 is a quadrature modulator operating from 300 MHz to 4 GHz. It features high linearity, a selectable gain control switch, and a fast power-down pin for TDD applications. It operates from a 5-V supply and is packaged in a 24-VQFN. These specs make it suitable for wireless infrastructure and SDR.

Hey Google, what can replace the TRF3705?

The TRF3705 can be replaced by the TRF3705IRGET (same part, tape-and-reel) or the TRF372017 (with integrated PLL/VCO). For cross-brand, the ADL5375 is a functional equivalent but requires PCB changes. Always verify pin compatibility.

Is the TRF3705 the same as the TRF372017?

No, the TRF3705 and TRF372017 are different. The TRF372017 includes an integrated PLL/VCO, while the TRF3705 requires an external LO. They are not pin-compatible and serve different design needs.

Engineering reference data for TRF3705 — comparison, design guidance, and compliance information.

Selection Guide

Choose the TRF3705 when you need a wideband quadrature modulator from 300 MHz to 4 GHz with high linearity and a simple external LO. It is ideal for wireless infrastructure, microwave links, and SDR. If you require an integrated PLL/VCO, consider the TRF372017, but be prepared for a different pinout. For cross-brand options, the ADL5375 offers a wider frequency range but is not pin-compatible. The LTC5598 is limited to lower frequencies. For drop-in replacements, use the TRF3705IRGET or TRF3705IRGER.

Comparison with Alternatives

Parameter	This Product	TRF3705IRGET	TRF3705IRGER	TRF372017	ADL5375	LTC5598
Package	24-VQFN (RGE)	24-VQFN (RGE)	24-VQFN (RGE)	24-VQFN (RGE)	24-Lead LFCSP	24-QFN
Brand	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Analog Devices	Analog Devices
Frequency Range	300 MHz to 4 GHz	300 MHz to 4 GHz	300 MHz to 4 GHz	300 MHz to 4 GHz	400 MHz to 6 GHz	5 MHz to 1.6 GHz
Integrated PLL/VCO	No	No	No	Yes	No	No
Supply Voltage	5 V	5 V	5 V	5 V	5 V	3.3 V
Power-Down Pin	Yes	Yes	Yes	Yes	Yes	Yes
Gain Control	Selectable	Selectable	Selectable	Selectable	Fixed	Fixed
Pin Compatibility	Reference	Yes	Yes	No	No	No

Key Differentiators

Wide frequency range up to 4 GHz (vs LTC5598)
Selectable gain control (vs ADL5375)
Same-brand drop-in variants (vs TRF372017)

Design Notes

Ensure the exposed thermal pad on the VQFN package is soldered to a solid ground plane with multiple vias for thermal and RF performance. Follow the layout guidelines in the datasheet for the RF output and LO input traces to maintain 50-ohm impedance.

Decouple the 5-V supply with a 100-nF capacitor close to each VCC pin and a 10-uF bulk capacitor. The power-down pin can be used to reduce current consumption in TDD systems, but ensure proper timing to avoid spectral regrowth.

Use differential routing for the I/Q baseband inputs to minimize noise coupling. Keep the LO input path short and well-shielded to prevent LO leakage. The selectable gain control can be used to optimize output power, but verify the effect on linearity.