DC758A Analog Devices

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 758 7 GHZ RF DETECTOR WITH WIDE OUTPUT BW LTC5535ES6 DESCRIPTION Demonstration circuit 758 is used to evaluate the The optional R1 termination resistor and R3 output LTC 5535ES6, RF power detector with integrated shunt resistor are not placed on the PCB. R2 and R4 output buffer and voltage reference. The LTC5535ES6 are 500 ohm resistors. This corresponds to the gain has provisions for enable and gain adjustments. The setting = 2. Voss pin E3 should be connected to LTC5535ES6 converts an RF input signal at pin 1 ground for initial tests and measurements. (RFin) to a DC voltage at pin 5 (Vout). The RF input Design files for this circuit board are available. Call frequency range is 300 MHz to 7000 MHz. Maximum the LTC factory. input power is 10 dBm. The output voltage at Vout LTC is a trademark of Linear Technology Corporation will start at an initial DC value of typically 200 mV +/- 20 mV. When the RF signal is applied, the output voltage will increase. QUICK START PROCEDURE Demonstration circuit 758 is easily set up for evaluat- tice to include a 2dB or 3dB pad to minimize re- ing the LTC5535ES6 RF power detector performance. flections back into the signal generator. Follow the procedures outlined below and connec- 2. Apply an RF input signal and measure the Vout tions on the attached diagram for proper operation. DC voltage at E2. 3. Connect E3 (Vos pin) to ground. 1. Connect the DC power supply (2.7V to 6V) to E1. Optional measurements can be done by changing the Connect the power supply ground to E4 or E5. R2 resistor from 500 ohm to a higher value to in- Connect J1 to the RF signal generator via coaxial crease the gain of the part, if desired. cable with an SMA connector. It is common prac- 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 758 7 GHZ RF DETECTOR WITH WIDE OUTPUT BW Figure 1. Proper Measurement Equipment Setup 2