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AD7466 Fiches technique(PDF) 1 Page - Analog Devices

No de pièce AD7466
Description  Software-Calibrated, 50 MHz to 9 GHz, RF Power Measurement System
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

AD7466 Fiches technique(HTML) 1 Page - Analog Devices

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Circuit Note
CN-0178
Circuits from the Lab™ reference circuits are engineered and
tested for quick and easysystemintegrationto helpsolve today’s
analog, mixed-signal, and RF design challenges. For more
informationand/orsupport,visitwww.analog.com/CN0178.
Devices Connected/Referenced
ADL5902
50 MHz to 9 GHz, 65 dB TruPwr™ Detector
AD7466
Micropower, 12-Bit, 200 kSPS SAR ADC
Software-Calibrated, 50 MHz to 9 GHz, RF Power Measurement System
Rev.A
Circuitsfromthe Lab™circuitsfromAnalog Deviceshave been designedandbuiltbyAnalogDevices
engineers. Standard engineering practices have been employed in the design and construction of
eachcircuit,andtheirfunctionandperformancehavebeentestedandverifiedinalabenvironmentat
room temperature. However, you are solely responsible for testing the circuit and determining its
suitabilityandapplicabilityforyouruseandapplication.Accordingly,innoeventshallAnalogDevices
be liable for direct, indirect, special, incidental, consequential or punitive damages due to any cause
whatsoeverconnectedtotheuseofanyCircuitsfromtheLabcircuits. (Continuedonlastpage)
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2010
–2011 Analog Devices, Inc. All rights reserved.
EVALUATION AND DESIGN SUPPORT
Circuit Evaluation Boards
CN-0178 Circuit Evaluation Board (EVAL-CN0178-SDPZ)
System Demonstration Platform (EVAL-SDP-CB1Z)
Design and Integration Files
Schematics, Layout Files, Bill of Materials
CIRCUIT FUNCTION AND BENEFITS
This circuit uses the ADL5902 TruPwr™ detector to measure the
rms signal strength of RF signals with varying crest factors
(peak-to-average ratio) over a dynamic range of approximately
65 dB and operates at frequencies from 50 MHz up to 9 GHz.
The measurement result is provided as serial data at the output
of a 12-bit ADC (AD7466). A simple 4-point system calibration
at ambient temperature is performed in the digital domain.
The interface between the RF detector and the ADC is
straightforward, consisting of two signal scaling resistors and
no active components. In addition, the ADL5902 internal 2.3 V
reference voltage provides the supply and reference voltage for
the micropower ADC. The AD7466 has no pipeline delay and
is operated as a read-only SAR ADC.
The overall circuit achieves temperature stability of
approximately ±0.5 dB.
X2
BIAS AND POWER-
DOWN CONTROL
1
NC
NC
NC
LINEAR-IN-dB VGA
(NEGATIVE SLOPE)
IDET
26pF
2
3
4
11
10
9
5
6
8
16
15
14
13
ADL5902
12
VREF
2.3V
TEMPERATURE
SENSOR
INLO
INHI
VPOS
VPOS
TEMP
VOUT
CLPF
COMM
COMM
VTGT
VREF
TADJ
G = 5
ITGT
X2
C9
0.1µF
AD7466
12-BIT
SUCCESSIVE
APPROXIMATION
ADC
CONTROL
LOGIC
GND
VDD
VIN
SCLK
SDATA
T/H
CS
C4
100pF
C3
0.1µF
C5
100pF
C7
0.1µF
+5V
+5V
R12
301Ω
R11
2kΩ
R9
1430Ω
R10
3.74kΩ
3
1
2
C9A
0.1µF
C10A
10µF
4
5
6
DGND
CLK
DATA
CS
R10
1.21kΩ
R11
2kΩ
RFIN
R3
60.4Ω
C12
100pF
C10
100pF
7
VSET
Figure 1. Software-Calibrated RF Power Measurement System


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