HOW DOES IT WORK? RF Meter Click is based on the AD8318, a logarithmic detector/controller from Analog Devices. It is a demodulating logarithmic amplifier capable of accurately converting an RF input signal to a corresponding decibel-scaled output voltage. It employs the progressive compression technique over a cascaded amplifier chain, with each stage equipped with a detector cell. The AD8318 can be used in measurement or controller mode of operation. It maintains accurate log conformance for signals of 1MHz to 6GHz and provides operation up to 8GHz. The input range is typically 60dB with an error of less than ±1dB and a 10ns response time that enables RF burst detection beyond 45MHz. In addition, the AD8318 comes with an integrated temperature sensor with independent output which can be used as a temperature compensation. The voltage output of the AD8318 goes to the MCP3201, a successive approximation 12-bit analog-to-digital converter with an onboard sample and hold circuitry from Microchip. This ADC provides a single pseudo-differential output, with sample rates of up to 100ksps. To provide correct values, this Click board™ uses an AP7331 LDO linear regulator to provide referent voltage to the MCP3201. The RF Meter uses a 3-wire SPI serial interface of the MCP3201 to communicate to the host MCU over the mikroBUS™ socket. The RF Meter can use either an SPI mode 0 or an SPI mode 1, depending on the needs. The readings of the independent temperature sensor of the AD8318 can be read over the OUT pin mikroBUS™ socket, giving analog values. This Click board™ can operate with either 3.3V or 5V logic voltage levels selected via the LOGIC LEVEL jumper. This way, both 3.3V and 5V capable MCUs can use the communication lines properly. However, the Click board™ comes equipped with a library containing easy-to-use functions and an example code that can be used, as a reference, for further development. SPECIFICATIONS Type RF meter Applications Can be used for testing equipment that includes RF transmitters or relays. It enables monitoring and measuring frequency levels to ensure proper functioning and leak detection On-board modules AD8318 - logarithmic detector/controller from Analog Devices MCP3201 - 12-bit ADC with SPI serial interface from Microchip Key Features Wide bandwidth from 1 MHz to 8 GHz over a 60 dB range, high accuracy, independent temperature measurements, stability over temperature, low power consumption, and more Interface GPIO,SPI Compatibility mikroBUS Click board size M (42.9 x 25.4 mm) Input Voltage 3.3V or 5V PINOUT DIAGRAM This table shows how the pinout on RF Meter Click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes Pin Pin Notes Temperature Data OUT 1 AN PWM 16 NC NC 2 RST INT 15 NC SPI Chip Select CS 3 CS RX 14 NC SPI Clock SCK 4 SCK TX 13 NC SPI Data OUT SDO 5 MISO SCL 12 NC NC 6 MOSI SDA 11 NC Power Supply 3.3V 7 3.3V 5V 10 5V Power Supply Ground GND 8 GND GND 9 GND Ground ONBOARD SETTINGS AND INDICATORS Label Name Default Description - PWR - Power LED Indicator - LOGIC LEVEL Left Logic Level Voltage Selection 3V3/5V: Left position 3V3, Right position 5V RF METER CLICK ELECTRICAL SPECIFICATIONS Description Min Typ Max Unit Supply Voltage 3.3 - 5 V Frequency Range 0.001 - 8 GHz SOFTWARE SUPPORT We provide a library for the RF Meter Click as well as a demo application (example), developed using Mikroe compilers. The demo can run on all the main Mikroe development boards. Package can be downloaded/installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account. Library Description This library contains API for RF Meter Click driver. Key functions Function is used to calculate radio frequency signal strenght in a vicinity. Example Description Demo app measures and displays signal strenght by using RF Meter click board. void application_task ( void ) { signal = rfmeter_get_signal_strenght( &rfmeter, RFMETER_DEF_SLOPE, RFMETER_DEF_INTERCEPT ); log_printf( &logger, "Signal strenght: %.2f dBm rn", signal ); Delay_ms( 1000 ); log_printf( &logger, "-----------------------rn" ); } The full application code, and ready to use projects can be installed directly from NECTO Studio Package Manager (recommended), downloaded from our LibStock™ or found on Mikroe github account.
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