User's Manual

Module SRF310

U098.0.00-SRF310 User Manual

RF_PAEN Enable external PA Active High from SPI master

RF_HGM/BPA

Enable external LNA or

Read BPA jumper

Function not used in SRF310

Input to SPI master

RF Port Antenna connection 50 Ohm RF In/Out port

GND ground Low impedance ground

The 15010300 PCB assembly includes all circuits and features required for properly

implementing the SRF310 Type 4

Figure 3. 15010300, component side with shield and label.

Type 4 Module Application Engineering:

The Type 4 module requires that the host application provide suitable mechanical and

electrical mounting, control and power signals, an approved antenna that is properly mounted

and a proper RF transmission line to connect the RF port on the module to the antenna feed

port.

Mounting: This module must be mounted over a ground plane that extends at least 8mm from

the RF shield edges. All connections between the host application and the module are to be

soldered.

Power and Control Signals: All power, ground and control signal connections listed in Table 1

must be made, except RF_HGM/BPA.

RF Transmission Line: The RF connection between the module RF port and the antenna

feed port must have a nominal 50 Ohm impedance, have low insertion loss and be as short as

practical. Microstrip transmission line may be implemented as part of the host PCB. Coaxial

cable may be used to connect to an external antenna. Coaxial cable can be attached either with

a suitable connector or may be directly soldered to where the host PCB attaches to the RF port

of the module. If a replaceable external antenna is used the user-accessible external connection

must be a unique type such as RP-TNC, RP-SMA, etc.

Grounding: The SRF310 module must be connected to a good RF ground plane that is

part of the host circuit board.