AD8364 Datasheet | Analog Devices

FEATURES RMS measurement of high crest-factor signals Dual-channel and channel difference outputs ports Integrated accurately scaled temperature sensor Wide dynamic range ±1 d B over 60 d B ±0.5 d B temperature-stable linear-in-d B response Low log conformance ripple +5 V operation at 70 m A, - 40°C to +85°C Small footprint, 5 mm × 5 mm, LFCSP APPLICATIONS Wireless infrastructure power amplifier linearization/control Antenna VSWR monitor Gain and power control and measurement Transmitter signal strength indication (TSSI) Dual-channel wireless infrastructure radios GENERAL DESCRIPTION The AD8364 is a true rms, responding, dual-channel RF power measurement subsystem for the precise measurement and control of signal power. The flexibility of the AD8364 allows munications systems, such as RF power amplifiers and radio transceiver AGC circuits, to be monitored and controlled with ease. Operating on a single 5 V supply, each channel is fully specified for operation up to 2.7 GHz over a dynamic range of 60 d B. The AD8364 provides accurately scaled, independent, rms outputs of both RF measurement channels. Difference output ports, which measure the difference between the two channels, are also available. The on-chip channel matching makes the rms channel difference outputs extremely stable with temperature and process variations. The device also includes a useful temperature sensor with an accurately scaled voltage proportional to temperature, specified over the device operating temperature range. The AD8364 can be used with input signals having rms values from - 55 d Bm to +5 d Bm referred to 50 Ω and large crest factors with no accuracy degradation. LF to 2.7 GHz Dual 60 d B Tru Pwr™ Detector FUNCTIONAL BLOCK DIAGRAM CHPA DECA A VPSR A TEMP A CLPA VPSA 25 INHA 26 INLA 27 PWDN 28 R 29 INLB 30 INHB 31 VPSB 32 24 23 22 21 20 19 18 17 TEMP VGA CONTROL CHANNEL A Tru Pwr™ ISIG2 ITGT2 OUTA OUTB CHANNEL B Tru Pwr™ ISIG2 ITGT2 VGA BIAS CONTROL 1 2 3 4 5 6 78 16 VSTA 15...