QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 821 300MHZ TO 11GHZ PRECISION DUAL RF POWER DETECTOR LTC5533 DESCRIPTION Demonstration circuit 821 is a precision dual RF down mode reduces current to less than 2A/channel. The initial output starting voltages of power detector featuring the LTC 5533. 130mV35mV can be precisely adjusted using the The LTC5533 is a dual channel RF power detector for V pins. OS RF applications operating in the 300MHz to 11GHz The LTC5533 operates with input power levels from range. Two independent temperature compensated -32dBm to 12dBm. Schottky diode peak detectors and buffer amplifiers are combined in a small 4mm x 3mm DFN package. Design files for this circuit board are available. Call the LTC factory. The RF input voltage is peak detected using on-chip Schottky diodes. The detected voltage is buffered LTC is a trademark of Linear Technology Corporation and supplied to the V pins. A power saving shut- OUT Table 1. Typical Performance Summary (V = 3.6V, SHDN = 3V, T = 25C, source impedance = 50WWWW, unless otherwise noted. CC A Test circuit shown in Figure 2.) PARAMETER CONDITION VALUE V Operating Voltage 2.7V to 6V CC I Operating Current, per channel I = 0mA 0.45mA VCC VOUT I Shutdown Current, per channel SHDN = LO 0.01A VCC Voltage, Chip Disabled V = 2.7V to 6V 0.35V max SHDN CC SHDN Voltage, Chip Enabled V = 2.7V to 6V 1.4V min CC SHDN Input Current, per channel SHDN = 3.6V 22A RF Input Frequency Range 300MHz to 11GHz IN RF Input Power Range RF Frequency = 300MHz to 7GHz, V = 2.7V to 6V -32dBm to 12dBm IN CC Channel to Channel Isolation f = 2GHz 45dB V Voltage Range 0V to 1V OS V Input Current V = 1V -0.5A to 0.5A OS OS R = 2kW, V = 0V 110mV to 150mV LOAD OS V Start Voltage (No RF Input) OUT SHDN = LO 1mV V Output Current V = 1.75V, V = 2.7V, DV < 10mV 4mA OUT OUT CC OUT V Load Capacitance 33pF max OUT V Bandwidth C = 33pF, R = 2kW 2MHz OUT LOAD LOAD V Slew Rate V = 1V Step, C = 33pF, R = 2kW 3V/s OUT RFIN LOAD LOAD V Noise V = 3V, Noise BW = 1.5MHz, 50W RF Input Termination 1mV OUT CC P-P V Enable Time = LO to HI, C = 33pF, R = 2k 8s SHDN OUT LOAD LOAD 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 821 300MHZ TO 11GHZ PRECISION DUAL RF POWER DETECTOR QUICK START PROCEDURE Demonstration circuit 821 is easy to set up to evalu- 5. Connect voltmeters positive (+) leads to the demo ate the performance of the LTC5533. Refer to Figure board Vout test points (E2 and E7). 1 for proper measurement equipment setup and fol- 6. Connect RF signal generators outputs to demo low the procedure below: board RF in ports (SMA connectors J1 and J2) via 1. Connect all DC power supplies negative (-) outputs coaxial cables. to demo board Gnd test points (E5 and E10). 7. Using jumper cables, connect demo board V test CC 2. Connect V DC power supplies positive (+) out- points (E1 and E6) to SHDN test points (E4 and CC puts (2.7V to 6V) to demo board V test points E8). Now both the detectors are enabled (on) and CC (E1 and E6). are ready for measurement. NOTE: Do not exceed 6.5V, the absolute maximum NOTE: Make sure that the power is not applied to the supply voltage. SHDN test points before it is applied to the V test CC points. The voltages on the SHDN test points must 3. Connect V DC power supplies positive (+) out- OS never exceed V . CC puts (0V to 1V) to demo board V test points (E3 OS and E9). 8. Apply RF input signals and measure Vout DC volt- ages. 4. Connect voltmeters negative (-) leads to demo board Gnd test points (E5 and E10). NOTE: Do not exceed +12dBm, the absolute maxi- mum RF input power. Figure 1. Proper Measurement Equipment Setup 2