AD8302ARUZ

Product Summary

The AD8302ARUZ is an innovative, fully integrated system for measuring gain/loss and phase in numerous receive, transmit, and instrumentation applications. It requires few external components and a single supply of 2.7 V–5.5 V. The ac-coupled input signals can range from –60 dBm to 0 dBm in a 50 Ω system, from low frequencies up to 2.7 GHz. The outputs provide an accurate measurement of either gain or loss over a ±30 dB range scaled to 30 mV/dB, and of phase over a 0°–180° range scaled to 10 mV/degree. Both subsystems have an output bandwidth of 30 MHz, which may optionally be reduced by the addition of external filter capacitors. The AD8302ARUZ can be used in direct control mode to servo gain and phase of a signal chain toward predetermined setpoints. The AD8302ARUZ comprises a closely matched pair of demodulating logarithmic amplifiers, each having a 60 dB measurement range. By taking the difference of their outputs, a measurement of the magnitude ratio or gain between the two input signals is available. These signals may even be at different frequencies, allowing the measurement of conversion gain or loss. The AD8302ARUZ may be used to determine absolute signal level by applying the unknown signal to one input and a calibrated ac reference signal to the other. With the output stage feedback connection disabled, a comparator may be realized, using the setpoint pins MSET and PSET to program the thresholds.The AD8302ARUZ includes a phase detector of the multiplier type, but with precise phase balance, driven by the fully limited signals appearing at the outputs of the two logarithmic amplifiers. Thus, the phase accuracy measurement is independent of signal level over a wide range.The AD8302ARUZ is fabricated on Analog proprietary, highperformance 25 GHz SOI complementary bipolar IC process. It is available in a 14-lead TSSOP package and operates over a -40°C to +85°C temperature range. An evaluation board is available. The AD8302ARUZ can be applied in RF/IF PA linearization, precise rf power control, remote system monitoring and diagnostics, return Loss/VSWR measurements, and Log Ratio Function for AC Signals.

Parametrics

AD8302ARUZ absolute maximum ratings: (1)Supply Voltage VS: 5.5 V; (2)PSET, MSET Voltage: VS + 0.3 V; (3)INPA, INPB Maximum Input: -3 dBV; (4)Equivalent Power Re. 50 Ω: 10 dBm; (5)Maximum Junction Temperature: 125°C; (6)Operating Temperature Range: –40°C to +85°C; (7)Storage Temperature Range: –65°C to +150°C; (8)Lead Temperature Range (Soldering 60 sec): 300°C.

Features

AD8302ARUZ features: (1)measures gain/loss and phase up to 2.7 ghz; (2)dual demodulating log amps and phase detector; (3)input range –60 dbm to 0 dbm in a 50 Ω system; (4)accurate gain measurement scaling (30 mv/db); (5)measurement/controller/level comparator modes; (6)operates from supply voltages of 2.7 v–5.5 v; (7)stable 1.8 v reference voltage output; (8)small signal envelope bandwidth from dc to 30 MHz.

Diagrams