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AD8364XCP

更新时间： 2024-02-07 17:08:30
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AD8364XCP 数据手册

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LF to 2.7 GHz  
Dual 60 dB TruPwr™ Detector  
AD8364  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
RMS measurement of high crest-factor signals  
Dual-channel and channel difference outputs ports  
Integrated accurately scaled temperature sensor  
Wide dynamic range 1 dB over 60 dB  
0.5 dB temperature-stable linear-in-dB response  
Low log conformance ripple  
24  
23  
22  
21  
20  
19  
18  
17  
TEMP  
VGA  
CONTROL  
25  
26  
27  
28  
29  
30  
16  
15  
14  
13  
12  
11  
VPSA  
INHA  
VSTA  
OUTA  
FBKA  
OUTP  
OUTN  
FBKB  
2
I
SIG  
CHANNEL A  
TruPwr™  
+5 V operation at 70 mA, –40°C to +85°C  
Small footprint, 5 mm x 5 mm, LFCSP  
2
I
TGT  
INLA  
PWDN  
COMR  
INLB  
OUTA  
OUTB  
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  
2
I
SIG  
CHANNEL B  
TruPwr™  
31  
32  
10  
9
INHB  
OUTB  
VSTB  
2
I
TGT  
VPSB  
VGA  
CONTROL  
BIAS  
1
2
3
4
5
6
7
8
Figure 1. Functional Block Diagram  
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 communi-  
cations 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 dB. 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 dBm to  
+5 dBm referred to 50 Ω and large crest factors with no  
accuracy degradation.  
Integrated in the AD8364 are two matched AD8362 channels  
(see the AD8362 data sheet for more information) with improved  
temperature performance and reduced log conformance ripple.  
Enhancements include improved temperature performance and  
reduced log-conformance ripple compared to the AD8362. On-  
chip wide bandwidth output op amps are connected to accom-  
modate flexible configurations that support many system  
solutions.  
The device can easily be configured to provide four rms  
measurements simultaneously. Linear-in-dB rms measurements  
are supplied at OUTA and OUTB, with conveniently scaled  
slopes of 50 mV/dB. The rms difference between OUTA and  
OUTB is available as differential or single-ended signals at  
OUTP and OUTN. An optional voltage applied to VLVL  
provides a common mode reference level to offset OUTP and  
OUTN above ground.  
The AD8364 is supplied in a 32-lead, 5 mm × 5 mm LFCSP, for  
the operating temperature of –40°C to +85°C.  
Rev. 0  
Information furnished by Analog Devices is believed to be accurate and reliable.  
However, no responsibility is assumed by Analog Devices for its use, nor for any  
infringements of patents or other rights of third parties that may result from its use.  
Specifications subject to change without notice. No license is granted by implication  
or otherwise under any patent or patent rights of Analog Devices. Trademarks and  
registered trademarks are the property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
© 2005 Analog Devices, Inc. All rights reserved.  
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