ADL5501 Analog Devices, Inc., ADL5501 Datasheet

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ADL5501

Manufacturer Part Number
ADL5501
Description
50 Mhz To 6 Ghz Trupwr Detector
Manufacturer
Analog Devices, Inc.
Datasheet

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FEATURES
True rms response
Excellent temperature stability
Up to 30 dB input dynamic range at 4 GHz
50 Ω input impedance
1.25 V rms, 15 dBm, maximum input
Single-supply operation: 2.7 V to 5.5 V
Low power: 3.3 mW at 3 V supply
RoHS-compliant
APPLICATIONS
Measurement of CDMA-, CDMA2000-, W-CDMA-, and QPSK-/
RF transmitter or receiver power measurement
GENERAL DESCRIPTION
The ADL5501 is a mean-responding power detector for use
in high frequency receiver and transmitter signal chains from
50 MHz to 6 GHz. It is easy to apply, requiring only a single
supply between 2.7 V and 5.5 V and a power supply decoupling
capacitor. The input is internally ac-coupled and has a nominal
input impedance of 50 Ω. The output is a linear-responding dc
voltage with a conversion gain of 6.3 V/V rms at 900 MHz.
The ADL5501 is intended for true power measurement of simple
and complex waveforms. The device is particularly useful for
measuring high crest factor (high peak-to-rms ratio) signals,
such as CDMA-, CDMA2000-, W-CDMA-, and QPSK-/QAM-
based OFDM waveforms. The on-chip modulation filter provides
adequate averaging for most waveforms.
Rev. A
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.
QAM-based OFDM, and other complex modulation
waveforms
RFIN
ADL5501
TRANS-
CONDICTANCE
CELLS
FUNCTIONAL BLOCK DIAGRAM
x
x
2
2
i
i
REFERENCE
BAND-GAP
ERROR
Figure 2.
AMP
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
The on-chip, 100 Ω series resistance at the output, combined
with an external shunt capacitor, creates a low-pass filter response
that reduces the residual ripple in the dc output voltage. For more
complex waveforms, an external capacitor at the FLTR pin can
be used for supplementary signal demodulation.
The ADL5501 offers excellent temperature stability across a
30 dB range and near 0 dB measurement error across temperature
over the top portion of the dynamic range. In addition to its
temperature stability, the ADL5501 offers low process variations
that further reduce calibration complexity.
The ADL5501 operates from −40°C to +85°C and is available in
a small 6-lead SC-70 package. It is fabricated on a proprietary
high f
INTERNAL FILTER
CAPACITOR
BUFFER
T
0.03
Figure 1. Output vs. Input Level, Supply 3 V, Frequency 1.9 GHz
0.1
silicon bipolar process.
5
1
–25
100Ω
–20
©2006-2007 Analog Devices, Inc. All rights reserved.
FLTR
VPOS
VRMS
ENBL
COMM
–15
–10
TruPwr Detector
INPUT (dBm)
50 MHz to 6 GHz
–5
0
ADL5501
5
www.analog.com
10
15

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ADL5501 Summary of contents

Page 1

... In addition to its temperature stability, the ADL5501 offers low process variations that further reduce calibration complexity. The ADL5501 operates from −40°C to +85°C and is available in a small 6-lead SC-70 package fabricated on a proprietary high f silicon bipolar process ...

Page 2

... ADL5501 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 Absolute Maximum Ratings............................................................ 8 ESD Caution.................................................................................. 8 Pin Configuration and Function Descriptions............................. 9 Typical Performance Characteristics ........................................... 10 Circuit Description......................................................................... 16 Filtering........................................................................................ 16 Applications..................................................................................... 17 Basic Connections ...................................................................... 17 Output Swing .............................................................................. 17 Linearity....................................................................................... 17 Input Coupling Using a Series Resistor ................................... 18 REVISION HISTORY 10/07— ...

Page 3

... dBm, 400 mV rms −21 dBm rms −5 dBm IN 25°C ≤ T ≤ 85°C A −40°C ≤ T ≤ +25°C A Rev Page ADL5501 Min Typ Max Unit 50 6000 MHz 88||6.5 Ω||pF 11 dBm − ...

Page 4

... ADL5501 Parameter RMS CONVERSION (f = 450 MHz) Input Impedance Input Return Loss 1 Dynamic Range ±0.25 dB Error 4 2 ±0.25 dB Error 2 ±1 dB Error 2 ±2 dB Error Maximum Input Level Minimum Input Level Conversion Gain 3 Output Intercept Output Voltage—High Power In Output Voltage—Low Power In Temperature Sensitivity ...

Page 5

... Intercept OUT dBm, 400 mV rms −21 dBm rms −5 dBm IN 25°C ≤ T ≤ 85°C A −40°C ≤ T ≤ +25°C A Rev Page ADL5501 Min Typ Max Unit 36||0.4 Ω||pF 14 ...

Page 6

... ADL5501 Parameter RMS CONVERSION (f = 2700 MHz) Input Impedance Input Return Loss 1 Dynamic Range ±0.25 dB Error 4 2 ±0.25 dB Error 2 ±1 dB Error 2 ±2 dB Error Maximum Input Level Minimum Input Level Conversion Gain 3 Output Intercept Output Voltage—High Power In Output Voltage—Low Power In Temperature Sensitivity ...

Page 7

... The response time is measured from 10% to 90% of settling level; see Figure 30. 6 Supply current is input-level dependent; see Figure 6. Condition −40°C < T < +85° signal at RFIN No signal at RFIN, ENBL Input LO Rev Page ADL5501 Min Typ Max Unit 2.7 5.5 V 1.1 mA 0.1 <5 μA ...

Page 8

... ADL5501 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter Rating Supply Voltage V 5 VRMS RFIN 1.25 V rms Equivalent Power, re: 50 Ω 15 dBm Internal Power Dissipation 80 mW θ (SC-70) 494°C/W JA Maximum Junction Temperature 125°C Operating Temperature Range −40°C to +85°C Storage Temperature Range − ...

Page 9

... High resistive loads are recommended to preserve output swing. VPOS VRMS 1 6 ADL5501 FLTR ENBL 2 5 TOP VIEW (Not to Scale) RFIN COMM 3 4 Figure 3. Pin Configuration for normal operation. Connect pin to ground for disable mode for a supply S Rev Page ADL5501 and forms a low-pass filter with an S ...

Page 10

... ADL5501 TYPICAL PERFORMANCE CHARACTERISTICS T = 25° 5 open FLTR OUT 10 1 0.1 0.03 –25 –20 –15 –10 –5 INPUT (dBm) Figure 4. Output vs. Input Level; Frequencies 100 MHz, 450 MHz, 900 MHz,1900 MHz, 2350 MHz, 2700 MHz, and 4000 MHz; Supply 5.0 V 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0 0.2 0.4 0.6 0.8 INPUT (V rms) Figure 5. Output vs. Input Level (Linear Scale) ...

Page 11

... INPUT (dBm) at −40°C and +85°C, Frequency 1900 MHz, Supply 5 –1 –2 –3 –25 –20 –15 –10 – INPUT (dBm) at −40°C and +85°C, Frequency 2350 MHz, Supply 5.0 V ADL5501 ...

Page 12

... ADL5501 –1 –2 –3 –25 –20 –15 –10 –5 INPUT (dBm) Figure 16. Temperature Drift Distributions for 50 Devices at −40°C, +25°C, and +85°C vs. +25°C Linear Reference; Frequency 2700 MHz; Supply 5 –1 –2 –3 –25 –20 –15 –10 – ...

Page 13

... PICH + FCH (9.6kbps) + DCCH, 6.3dB CF PICH + FCH (9.6kbps) + SCH (153.6kbps), 6.7dB CF PICH + FCH (9.6kbps) + DCCH + 1 SCH (153.6kbps), 7.6dB CF 0 –1 –2 –3 –25 –20 –15 –10 –5 0 RFIN (dBm) Figure 27. Error from CW Linear Reference vs. Input with Various FLTR ADL5501 nF 100 nF OUT ...

Page 14

... RFIN (dBm) Figure 28. Error from CW Linear Reference vs. Input with Various WCDMA Down Link Waveforms at 2140 MHz 100pF 0.1µF ADL5501 POWER VPOS VRMS 1 SUPPLY C FLTR FLTR ENBL 2 RF PULSE RFIN COMM 3 GENERATOR Figure 29. Hardware Configuration for Output Response to RF Input Pulse ...

Page 15

... ENBL 400mV rms RF INPUT 250mV rms 160mV rms 70mV rms 100µs/DIV = Open 0.1 μF, R FLTR OUT 500 1000 1500 2000 2500 3000 FREQUENCY (MHz) Figure 39. Intercept vs. Frequency, Supply 5 V ADL5501 = Open OUT = 1 kΩ OUT 3500 4000 ...

Page 16

... This second cell is driven by a fraction of the quasi-dc output voltage of the ADL5501. When the voltage at the input of the second squaring cell is equal to the rms value of V state, and the output then represents the rms value of the input. ...

Page 17

... V/V rms). The output voltage swings from near ground to 4 5.0 V supply. Figure 41 shows the output swing of the ADL5501 input for various supply voltages clear from Figure 41 that operating the device at lower supply voltages reduces the dynamic range as the output headroom decreases ...

Page 18

... R is the input impedance of RFIN. IN ATTN is the desired attenuation factor in dB. For example power amplifier with a maximum output power of +28 dBm is matched to the ADL5501 input at +5 dBm, then a −23 dB attenuation factor is required. At 900 MHz, the input resistance Ω. IN −23/20 − ...

Page 19

... COMM (Pin removing the supply power to the device. Disabling the device via the ENBL function reduces the leakage current to less than 1 μA. If the input of the ADL5501 is driven while the device is disabled (ENBL = COMM), the leakage current of less than 1 μA increases Residual function of input level ...

Page 20

... Figure 48. Output Buffering Options, Slope of 3.2 V/V rms at 900 MHz Figure 49. Output Buffering Options, Slope of 6.3 V/V rms at 900 MHz VRMS OUTPUT OFFSET The ADL5501 has a ±1 dB error detection range of about 30 dB, as shown in Figure 10 to Figure 12 and Figure 16 to Figure 18. The error is referred to the best-fit line defined in the linear region of the output response. Below an input power of − ...

Page 21

... For example wireless transmitter, the accuracy of the high power amplifier (HPA) is most critical at or close to full power. The ADL5501 offers a tight error distribution in the high input power range, as shown in Figure 52. The high accuracy range, centered around ...

Page 22

... INPUT (dBm rms) Figure 53. Typical Drift at 1.9 GHz for Various Temperatures OPERATION BELOW 100 MHz AND ABOVE 4.0 GHz The ADL5501 works at frequencies below 100 MHz, but exhibits slightly higher linearity error. Figure 54 shows the error distribution of 12 devices at 50 MHz over temperature. When compared to an ideal linear transfer function at ambient, the error of the ADL5501 over temperature remains within ± ...

Page 23

... Device Enable. When the switch is set toward the SW1 label, the ENBL pin is connected to VPOS, and the ADL5501 is in operating mode. In the opposite switch position, the ENBL pin is grounded (through the 49.9 Ω resistor), putting the device in power-down mode. While in this switch position, the ENBL pin can be driven by a signal generator via the SMA labeled ENBL. In this case, R4 serves as a termination resistor for generators requiring a 50 Ω ...

Page 24

... ADL5501 Figure 59. Layout of Evaluation Board, Component Side Figure 60. Layout of Evaluation Board, Circuit Side Rev Page ...

Page 25

... COMPLIANT TO JEDEC STANDARDS MO-203-AB Figure 61. 6-Lead Thin Shrink Small Outline Transistor Package [SC-70] (KS-6) Dimensions shown in millimeters Package Description 6-Lead SC-70, 7” Tape and Reel 6-Lead SC-70, 7” Tape and Reel Evaluation Board Rev Page 0.46 0.36 0.22 0.26 0.08 Package Option Branding KS-6 Q0Z KS-6 Q0Z ADL5501 Ordering Quantity 3,000 250 ...

Page 26

... ADL5501 NOTES Rev Page ...

Page 27

... NOTES Rev Page ADL5501 ...

Page 28

... ADL5501 NOTES ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06056-0-10/07(A) Rev Page ...

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