Datasheet AD8364 (Analog Devices)

LF to 2.7 GHz Dual 60 dB TruPwr™ Detector Data Sheet AD8364 FEATURES FUNCTIONAL BLOCK DIAGRAM RMS measurement of high crest-factor signals Dual-channel and channel difference outputs ports CHPA DECA COMA VPSR ACOM TEMP ACOM CLPA 24 23 22 21 20 19 18 17 Integrated accurately scaled temperature sensor Wide dynamic range ±1 dB over 60 dB TEMP VGA ±0.5 dB temperature-stable linear-in-dB response CONTROL VPSA 25 16 VSTA Low log conformance ripple I 2 SIG INHA 26 CHANNEL A 15 OUTA +5 V operation at 70 mA, –40°C to +85°C TruPwr™ I 2 TGT Small footprint, 5 mm × 5 mm, LFCSP INLA 27 14 FBKA APPLICATIONS PWDN 28 13 OUTP OUTA OUTB COMR 29 12 OUTN Wireless infrastructure power amplifier linearization/control Antenna VSWR monitor INLB 30 11 FBKB I 2 CHANNEL B SIG Gain and power control and measurement INHB 31 TruPwr™ 10 OUTB 2 Transmitter signal strength indication (TSSI) ITGT VPSB 32 9 VSTB Dual-channel wireless infrastructure radios VGA CONTROL BIAS 1 2 3 4 5 6 7 8 CHPB VLVL DECB ADJB ADJA VREF CLPB COMB
05334-001 Figure 1. Functional Block Diagram
GENERAL DESCRIPTION
The AD8364 is a true rms, responding, dual-channel RF power Integrated in the AD8364 are two matched AD8362 channels measurement subsystem for the precise measurement and control (see the AD8362 data sheet for more information) with improved of signal power. The flexibility of the AD8364 allows communi- temperature performance and reduced log conformance ripple. cations systems, such as RF power amplifiers and radio transceiver Enhancements include improved temperature performance and AGC circuits, to be monitored and controlled with ease. Operating reduced log-conformance ripple compared to the AD8362. On- on a single 5 V supply, each channel is ful y specified for operation chip wide bandwidth output operational amplifiers are connected up to 2.7 GHz over a dynamic range of 60 dB. The AD8364 to accom-modate flexible configurations that support many provides accurately scaled, independent, rms outputs of both RF system solutions. measurement channels. Difference output ports, which measure The device can easily be configured to provide four rms the difference between the two channels, are also available. The measurements simultaneously. Linear-in-dB rms measurements on-chip channel matching makes the rms channel difference are supplied at OUTA and OUTB, with conveniently scaled outputs extremely stable with temperature and process variations. slopes of 50 mV/dB. The rms difference between OUTA and The device also includes a useful temperature sensor with an OUTB is available as differential or single-ended signals at accurately scaled voltage proportional to temperature, specified OUTP and OUTN. An optional voltage applied to VLVL over the device operating temperature range. The AD8364 can provides a common mode reference level to offset OUTP and be used with input signals having rms values from −55 dBm to OUTN above ground. +5 dBm referred to 50 Ω and large crest factors with no accuracy degradation. The AD8364 is supplied in a 32-lead, 5 mm × 5 mm LFCSP, for the operating temperature of –40°C to +85°C.
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Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION SQUARE LAW DETECTOR AND AMPLITUDE TARGET RF INPUT INTERFACE OFFSET COMPENSATION TEMPERATURE SENSOR INTERFACE VREF INTERFACE POWER-DOWN INTERFACE VST[A, B] INTERFACE OUT[A, B, P, N] OUTPUTS MEASUREMENT CHANNEL DIFFERENCE OUTPUT USING OUT[P, N] CONTROLLER MODE RF MEASUREMENT MODE BASIC CONNECTIONS CONTROLLER MODE BASIC CONNECTIONS Automatic Power Control Automatic Gain Control CONSTANT OUTPUT POWER OPERATION GAIN-STABLE TRANSMITTER/RECEIVER TEMPERATURE COMPENSATION ADJUSTMENT DEVICE CALIBRATION AND ERROR CALCULATION SELECTING CALIBRATION POINTS TO IMPROVE ACCURACY OVER A REDUCED RANGE CHANNEL ISOLATION ALTERING THE SLOPE CHOOSING THE RIGHT VALUE FOR CHP[A, B] AND CLP[A, B] RF BURST RESPONSE TIME SINGLE-ENDED INPUT OPERATION PRINTED CIRCUIT BOARD CONSIDERATIONS PACKAGE CONSIDERATIONS DESCRIPTION OF CHARACTERIZATION BASIS FOR ERROR CALCULATIONS EVALUATION BOARD OUTLINE DIMENSIONS ORDERING GUIDE