6.3 Feature Description

Besides the PA, LNA, the TR switch, and the ANT switch, the TRF2001 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 TRF2001 inherently

achieves second and third order harmonic rejection below –56dBc and –64.5dBc, respectively, 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 TRF2001 has 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 Digital Mode Control

Logic. In the TX mode, the PA path is enabled by connecting the TR switch to the TX_FLT pin and the ANT

switch to the PA output path. In the RX mode, the TR switch connects to the LNA path and the ANT switch

connects to the RX_FLT pin. For the TX path, connect an optional TX filter between TX_FLT and PA_IN to reject

out-of-band spurs from the SoC or short the TX_FLT to PA_IN. Connect an optional RX filter between RX_FLT

and LNA_IN pins to reject out-of-band signals coming in at the ANT pin or short RX_FLT to LNA_IN to engage

the LNA in the receive path.

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TRF2001

SLVSK83 – APRIL 2026

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