adl5902 Analog Devices, Inc., adl5902 Datasheet

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adl5902

Manufacturer Part Number
adl5902
Description
100 Mhz To 9 Ghz 60 Db Trupwr ? Detector
Manufacturer
Analog Devices, Inc.
Datasheet

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Preliminary Technical Data
FEATURES
Accurate RMS-to-DC conversion from 100 MHz to 9 GHz
Single ended input dynamic range of 60 dB
No balun or external input tuning required
Waveform and modulation independent, such as
Linear-in-decibels output, scaled 50 mV/dB
Temperature stability of <±0.3 dB
All functions temperature and supply stable
Operates from 4.5 V to 5.5 V from −40°C to +125°C
Power-down capability
Small footprint, 4 mm x 4 mm, LFCSP
Pin-compatible with the AD8363 TruPwr™ Detector
APPLICATIONS
Power amplifier linearization/control loops
Transmitter power controls
Transmitter signal strength indication (TSSI)
RF instrumentation
GENERAL DESCRIPTION
The ADL5902 is a true RMS responding power detector that
has a 60 dB measurement range when driven with a single-
ended 50 Ω source. This feature makes the ADL5902 extremely
frequency versatile by eliminating the need for a balun, or any
other form of external input tuning, for operation up to 9 GHz.
The ADL5902 provides a solution in a variety of high frequency
communication systems and in instrumentation requiring an
accurate response to signal power. Requiring only a single
supply of 5 V and a few capacitors, it is easy to use and capable
of being driven single-ended or with a balun (for differential
input drive). The ADL5902 can operate from less than 100
MHz to 9 GHz and can accept inputs that have RMS values
from 1 mV to at least 1 V, with large crest factors, exceeding the
requirements for accurate measurement of WiMAX, CDMA,
WCDMA, TD-SCDMA, multi-carrier GSM, and LTE signals.
Rev. PrD
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 mayresult from its use. Specifications subjectto change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property oftheir respective owners.
GSM/CDMA/WCDMA/TD-SCDMA/WiMAX/LTE
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The ADL5902 can determine the true power of a high
frequency signal having a complex low frequency modulation
envelope, or as a simple low frequency RMS voltmeter.
Used as a power measurement device, VOUT is connected to
VSET. The output is then proportional to the logarithm of the
RMS value of the input. In other words, the reading is
presented directly in decibels and is conveniently scaled 50
mV/dB; other slopes are easily arranged. In controller modes,
the voltage applied to VSET determines the power level
required at the input to null the deviation from the set point.
The output buffer can provide high load currents.
The ADL5902 has a typical operating current of 65 mA at 25°C.
It is supplied in a 4 mm x 4 mm 16-lead LFCSP for operation
over the temperature range of −40°C to +125°C. A fully
populated RoHS-compliant evaluation board is also available.
INLO
INHI
NC
NC
13
14
15
16
TADJ/PWDN
VTGT
60 dB TruPwr
12
1
Figure 1 FUNCTIONAL BLOCK DIAGRAM.
VREF
©2009 Analog Devices, Inc. All rights reserved.
NC
11
2
100 MHz to 9 GHz
X
X
2
2
VPOS
VPOS
10
3
ADL5902
ADL5902
Detector
www.analog.com
COMM
COMM
9
4
8
7
6
5
TEMP
VSET
VOUT
CLPF

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adl5902 Summary of contents

Page 1

... The output buffer can provide high load currents. The ADL5902 has a typical operating current 25° supplied 16-lead LFCSP for operation over the temperature range of −40°C to +125°C. A fully populated RoHS-compliant evaluation board is also available ...

Page 2

... ADL5902 SPECIFICATIONS 25° Ω, Single ended input drive, VOUT tied to VSET otherwise noted. VTGT = 1V, two point calibration at-42 dBm and -2 dBm Table 1. Parameter Conditions OVERALL FUNCTION Frequency Range RF INPUT INTERFACE INHI (Pin 14), INLO (Pin 15), ac-coupled Input Impedance Single-ended drive ...

Page 3

... +25° +25°C, A < +85°C; TADJ = 0 dBm A IN < +85°C; TADJ = 0 -35 dBm A IN ≤ +85°C A ≤ +85°C, referred to 50 Ω Rev. PrD | Page ADL5902 Min Typ Max Unit -60 dBm ±0.1 dB ±0.1 dB ±0.1 dB ±0.1 2. ...

Page 4

... ADL5902 Parameter Conditions TEMPERATURE REFERENCE TEMP (Pin 8) Output Voltage T = 25° Temperature Coefficient −40°C ≤ T Current Source/Sink T = 25° change A Voltage Regulation I LOAD RMS TARGET INTERFACE VTGT (Pin 12) Input Voltage Range Input Resistance POWER-DOWN INTERFACE TADJ (Pin1) Logic Level to Enable ...

Page 5

... The paddle should be connected to both a thermal and electrical ground. (EPAD) Pad (EPAD) PIN 1 12 VTGT TADJ/PWDN 1 INDICATOR VREF AD8363 VPOS 3 10 VPOS TOP VIEW (Not to Scale) COMM 4 9 COMM NOTES CONNECT Figure 2. Pin Configuration Rev. PreD | Page ADL5902 ...

Page 6

... ADL5902 TYPICAL PERFORMANCE CHARACTERISTICS Ω, single-ended input drive, VOUT connected to VSET, VTGT = 1V, CLPF = 3.9 nF +85°C (red), where appropriate. Error referred to best-fit line (linear regression), unless otherwise indicated. Input RF signal is a sine wave unless otherwise indicated. 3600 3300 3000 ...

Page 7

... Figure 14. Output Response to RF Burst Input for RF Input Levels of −40 dBm, −30 dBm, −20 dBm, −10 dBm, and 0 dBm, Carrier Frequency 900 MHz, CLPF Rev. PrD | Page -55 -50 -45 -40 -35 -30 -25 -20 -15 -10 INHI (dBm) CW, Frequency =6000 MHz, Typical Device, TADJ =0.7V Carrier Frequency 900 MHz, CLPF = 3 470 pF ADL5902 - ...

Page 8

... In controller mode, the ADL5902 can control the gain of an external component. A set point voltage is applied to the VSET pin, the value of which corresponds to the desired RF input signal level applied to the ADL5902 fast responding output is expected, the 0 Ω resistor on R15 can be removed to reduce parasitics on the output. ...

Page 9

... R9 R16 C13 OPEN 0Ω 0.1µF VPOSC VREF VPOS1 Figure 15. Evaluation Board Schematic Rev. PrD | Page VSET TEMP R2 R13 OPEN VOUT OPEN 8 R6 R15 7 R1 0Ω 0Ω 0Ω 0.1µ OPEN 0Ω PADDLE AGND C4 GND GNDI ADL5902 VOUTP ...

Page 10

... ADL5902 ASSEMBLY DRAWINGS Figure 16. Evaluation Board Layout, Top Side Figure 17. Evaluation Board Layout, Bottom Side Preliminary Technical Data Figure 18. Evaluation Board Assembly, Top Side Figure 19. Evaluation Board Assembly, Bottom Side Rev. PrD | Page ...

Page 11

... Lead Frame Chip Scale Package [LFCSP_VQ] 16-Lead Lead Frame Chip Scale Package [LFCSP_VQ] Evaluation Board PR08218-0-6/09(PrD) Rev. PrD | Page 0.60 MAX PIN 1 INDICATOR 2.50 EXPOSED 2.35 SQ PAD 2.20 (BOTTOM VIEW 0.25 MIN 1.95 BSC Package Option Ordering Quantity CP-16-10 1,500 CP-16-10 250 CP-16-10 64 ADL5902 ...

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