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 power detector featuring the LTC®5533. The LTC5533 is a dual channel RF power detector for RF applications operating in the 300MHz to 11GHz range. Two independent temperature compensated Schottky diode peak detectors and buffer amplifiers are combined in a small 4mm x 3mm DFN package. The RF input voltage is peak detected using on-chip Schottky diodes. The detected voltage is buffered and supplied to the VOUT pins. A power saving shut- down mode reduces current to less than 2µA/channel. The initial output starting voltages of 130mV±35mV can be precisely adjusted using the VOS pins. The LTC5533 operates with input power levels from -32dBm to 12dBm. Design files for this circuit board are available. Call the LTC factory. LTC is a trademark of Linear Technology Corporation Table 1. Typical Performance Summary (VCC = 3.6V, SHDN = 3V, TA = 25°C, source impedance = 50Ω Ω, unless otherwise noted. Test circuit shown in Figure 2.) PARAMETER CONDITION VCC Operating Voltage VALUE 2.7V to 6V IVCC Operating Current, per channel IVOUT = 0mA 0.45mA IVCC Shutdown Current, per channel SHDN = LO 0.01µA SHDN Voltage, Chip Disabled VCC = 2.7V to 6V 0.35V max SHDN Voltage, Chip Enabled VCC = 2.7V to 6V 1.4V min SHDN Input Current, per channel SHDN = 3.6V 22µA RFIN Input Frequency Range 300MHz to 11GHz RFIN Input Power Range RF Frequency = 300MHz to 7GHz, VCC = 2.7V to 6V -32dBm to 12dBm Channel to Channel Isolation f = 2GHz 45dB VOS Voltage Range VOS Input Current VOUT Start Voltage (No RF Input) VOUT Output Current 0V to 1V VOS = 1V -0.5µA to 0.5µA RLOAD = 2kΩ, VOS = 0V 110mV to 150mV SHDN = LO 1mV VOUT = 1.75V, VCC = 2.7V, ∆VOUT < 10mV 4mA VOUT Load Capacitance VOUT Bandwidth 33pF max CLOAD = 33pF, RLOAD = 2kΩ 2MHz VOUT Slew Rate VRFIN = 1V Step, CLOAD = 33pF, RLOAD = 2kΩ 3V/µs VOUT Noise VCC = 3V, Noise BW = 1.5MHz, 50Ω RF Input Termination 1mVP-P VOUT Enable Time SHDN = LO to HI, CLOAD = 33pF, RLOAD = 2k 8µs 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 evaluate the performance of the LTC5533. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. 2. Connect all DC power supplies’ negative (-) outputs to demo board Gnd test points (E5 and E10). 5. Connect voltmeters’ positive (+) leads to the demo board Vout test points (E2 and E7). 6. Connect RF signal generators’ outputs to demo board RF in ports (SMA connectors J1 and J2) via coaxial cables. 7. Using jumper cables, connect demo board VCC test points (E1 and E6) to SHDN test points (E4 and E8). Now both the detectors are enabled (on) and are ready for measurement. Connect VCC DC power supplies’ positive (+) outputs (2.7V to 6V) to demo board VCC test points (E1 and E6). NOTE: Do not exceed 6.5V, the absolute maximum supply voltage. 3. 4. Connect VOS DC power supplies’ positive (+) outputs (0V to 1V) to demo board VOS test points (E3 and E9). Connect voltmeters’ negative (-) leads to demo board Gnd test points (E5 and E10). NOTE: Make sure that the power is not applied to the SHDN test points before it is applied to the VCC test points. The voltages on the SHDN test points must never exceed VCC. 8. Apply RF input signals and measure Vout DC voltages. NOTE: Do not exceed +12dBm, the absolute maximum RF input power. Figure 1. Proper Measurement Equipment Setup 2 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 821 300MHZ TO 11GHZ PRECISION DUAL RF POWER DETECTOR 3