RF112 datasheet(16/45 Pages) NXP

16 / 45 page

Baseband filter

5th order, Butterworth

Gain control

fc = 10 to 40 MHz

dcccxt

RXBB_OUT_I_P

RXBB_OUT_Q_P

RXBB_OUT_Q_N

RXBB_OUT_I_N

V2I

RSSI

RX_HB_IN

HB LO I HB LO Q

mixer

LNA

V2I

RSSI

RX_LB_IN

LB LO I LB LO Q

mixer

LNA

Figure 6. Block diagram of one receive chain.

The receive data path is DC coupled to avoid settling issues. To mitigate offset errors it is

recommended to perform offset compensation at the input of the active analog filter. The

DC offset compensation algorithm has to be run in the baseband.

The observation receivers are identical to the TRX receivers, except for that the second

observation receiver has no LB chain.

3.3.1 RxRF RSSI

The RxRF RSSI have three detection levels, that needs to be sampled at a nominal rate of

20 MSps using sample clocks derived from the 160 MHz synthesizer, synchronized for

all four receiver branches.

The decay rate of the peak detectors can be configurable to allow for a setting with

nonsignificant decay during a 50 ns sampling interval, but not so slow decay that it

becomes unable to track a change in signal level due to a radar pulse falling edge, that is

caused by out-of-band RADAR pulses which change the energy level for short durations

of 500-1000 ns in a periodic pattern.

The sampling in the analog detector is done using the 160 MHz clock from the

synthesizer, down-sampling and filtering is performed in the digital core.

Electrical characteristics

RF112 Transceiver Data Sheet, Rev. 1 Draft B, 05/2024

NXP Semiconductors

RF112 Datasheet(PDF) 16 Page - NXP Semiconductors