DC715A Analog Devices

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 715 RF POWER DETECTOR 300 MHZ TO 7000MHZ LTC5530ES6 DESCRIPTION Demonstration circuit 715 is used to evaluate the The optional R1 termination resistor and C3 output LTC 5530ES6, RF power detector with integrated out- shunt capacitor are not placed on the PCB. R3 and R4 put buffer and voltage reference. The LTC5530ES6 has are 10k ohm resistors. This corresponds to the gain set- provisions for enable and gain adjustments. The ting = 2. The demo circuit has R2, a 22K pull-up resistor, LTC5530ES6 converts an RF input signal at pin 1 (RFin) which provides a logic HIGH for the Enable pin (IC En- to a DC voltage at pin 5 (Vout). The RF input frequency abled). Enable pin E3 should be left unconnected for ini- range is 300 MHz to 7000 MHz. Maximum input power tial tests and measurements. is 10 dBm. The output voltage at Vout will start at an Design files for this circuit board are available. Call initial DC value of typically 120 mV +/- 35 mV. When the the LTC factory. RF signal is applied, the output voltage will increase. LTC is a trademark of Linear Technology Corporation QUICK START PROCEDURE Demonstration circuit 715 is easily set up for evaluating include a 2dB or 3dB pad to minimize reflections the LTC5530ES6 RF power detector performance. Follow back into the signal generator. the procedures outlined below and connections on the 2. Apply an RF input signal and measure the Vout DC attached diagram for proper operation. voltage at E2. 3. Connect E3 (Enable pin) to ground. The IC is in shutdown mode. 1. Connect the input DC power supply (2.7V to 6V) to E1. Connect the power supply ground to E4 or E5. Optional measurements can be done by changing the R3 Connect J1 to the RF signal generator via coaxial ca- resistor from 10k ohm to a higher value to increase the ble with an SMA connector. It is common practice to gain of the part, if desired. 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 715 RF POWER DETECTOR 300 MHZ TO 7000MHZ Figure 1. Proper Measurement Equipment Setup 2