6 Detailed Description

6.1 Overview

The TRF2001P is a high-performance RF front-end module (FEM) designed to be paired with wireless

microcontroller (MCU) and system-on-chip (SoC) ICs for applications primarily supporting various sub-1GHz ISM

bands. The device improves the link budget by increasing the system's TX power well beyond the capabilities of

the wireless MCUs and SoCs with the integrated PA and improving the RX sensitivity with the integrated LNA.

A key limitation of most wireless SoCs designed for the sub-1GHz ISM band is that the transmit (TX) output

power is typically limited to about 16dBm, with very few supporting up to 22dBm. When these SoCs are

used at TX powers greater than 10dBm, the spurious-free dynamic range (SFDR) often deteriorates. The

increased spurious levels require additional filtering and metal shielding in many cases, to comply with regulatory

requirements such as those set by the FCC and ETSI standards. The TRF2001P allows the SoCs to operate

at lower output power levels by providing additional RF gain and high TX output power capability that exceed

27dBm, thus reducing the SoC's spurious levels, and often eliminating the need for additional filtering and

shielding.

With integrated, fully matched 50Ω RF interfaces, the TRF2001P simplifies interface design to the antenna and

the wireless SoCs. The digital control logic pins (CEN, CTR, and CIB) of the device are used to configure the

device in TX, RX, or device powered down mode, and are compatible with CMOS levels of 1.6V to 3.3V.

The TRF2001P operates over a wide single supply voltage range of 3.1V to 4.25V and achieves 27.5dBm PSAT

on 3.3V supply. The device is available in a space-saving 4.5mm × 4.5mm, 28-pin, WQFN-FCRLF package.

6.2 Functional Block Diagram

TRF2001P Front-End Module

PA

Output

Matching

Input

Matching

Digital Controls

Output

Matching

Input

Matching

LNA

Power

Detector

PA_IN

LNA_OUT

CEN CTR CIB

LNA_IN RX_FLT

ANT

VDET

VCC_PA

VCC

ANT

Switch

6.3 Feature Description

Besides the PA, LNA, and the ANT switch, the TRF2001P integrates additional functions such as a harmonic

rejection filter and a power detector in a small 4.5mm × 4.5mm package.

The integrated harmonic rejection filter either eliminates the need for an external filter to the antenna or notably

relaxes the rejection requirements of the external filter if the system requires one. The TRF2001P inherently

achieves second order harmonic rejection below –55dBc at PO = 27dBm without any external filtering. The

integrated power detector provides analog voltage output corresponding to the output power as shown in Figure

5-6 and has a very stable response across temperature and supply voltage.

6.4 Device Functional Modes

The TRF2001P three functional modes: Transmit (TX), Receive (RX), and power down mode. The operating

mode of the device is set using the digital control pins, CEN, CTR, and CIB as shown in Section 5.7. In the TX

mode the PA path is enabled by connecting the ANT switch to the PA output path. In the RX mode, the ANT

switch connects to the RX_FLT pin. Connect an optional RX filter between RX_FLT and LNA_IN pins to reject

out-of-band signals or short the RX_FLT pin to LNA_IN pin to engage the LNA in the receive path.

TRF2001P

SLOSEA9 – DECEMBER 2025

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