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LT5534 50MHz to 3GHz RF Power Detector with 60dB Dynamic Range
FEATURES
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DESCRIPTIO
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RF Frequency Range: 50MHz to 3GHz Linear Dynamic Range: 60dB Exceptional Accuracy over Temperature and Power Supply Fast Transient Response: 38ns Full-Scale Settling Time Single 2.7V to 5.25V Supply Low Supply Current: 7mA Shutdown Current: 0.1A Tiny 6-Lead SC70 Package
APPLICATIO S
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The LT(R)5534 is a 50MHz to 3GHz monolithic RF power detector capable of measuring RF signals over a 60dB dynamic range. The RF signal in a decibel scale is precisely converted into DC voltage on a linear scale. The 60dB input dynamic range is achieved using cascaded RF detectors and RF limiters. Their outputs are summed to generate an accurate log-linear DC voltage proportional to the input RF signal in dB. The output is buffered with a low output impedance driver. The LT5534 delivers superior temperature stability (typical output variation within 1dB over the full temperature range). The output responds in less than 40ns to a large RF input signal.
, LTC and LT are registered trademarks of Linear Technology Corporation.
RF Receive Power Management RF Power Control CATV Power Detection Optical Receiver Gain Control
TYPICAL APPLICATIO
50MHz to 3GHz RF Power Detector
3V 0.1F 100pF
2.0 2.4
LT5534 DET 1nF RF INPUT 47 ENABLE RF DET DET
VCC
1.6 1 0 -1 TA = 25C TA = 85C TA = -40C -50 -40 -30 -20 -10 RF INPUT POWER (dBm) 0 -2 -3
VOUT
VOUT (V)
DET
DET
VOUT
EN GND
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Output Voltage vs RF Input Power
VCC = 3V AT 900MHz 3 2 LINEARITY ERROR (dB) 1.2 0.8 0.4 0 -60
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ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW EN 1 GND 2 VOUT 3 6 RF 5 GND 4 VCC
Power Supply Voltage ........................................... 5.5V Enable Voltage ................................................... 0V, VCC RF Voltage (+10dBm Equivalent) ............................ 1V Operating Ambient Temperature Range .. - 40C to 85C Storage Temperature Range ................. - 65C to 125C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LT5534ESC6 SC6 PART MARKING LBGD
SC6 PACKAGE 6-LEAD PLASTIC SC70
TJMAX = 125C, JA = 256C/W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
noted. Test circuit shown in Figure 1. (Note 2)
PARAMETER RF Input Frequency Range Input Impedance fRF = 50MHz RF Input Power Range Dynamic Range (Note 3) Output Slope Output Variation vs Temperature fRF = 900MHz RF Input Power Range Dynamic Range (Note 3) Output Slope Output Variation vs Temperature fRF = 1900MHz RF Input Power Range Dynamic Range (Note 3) Output Slope Output Variation vs Temperature Output Intercept fRF = 2500MHz RF Input Power Range Dynamic Range (Note 3) Output Slope Output Variation vs Temperature Output Interface Output DC Voltage Output Impedance Output Bandwidth Full-Scale Setting Time Sourcing/Sinking CONDITIONS
VCC = 3V, EN = 3V, TA = 25C, source impedance = 50, unless otherwise
MIN TYP 50 to 3000 2 -58 to +2 MAX UNITS MHz k dBm dB mV/dB dB/C dBm dB mV/dB dB/C dBm dB 43 -58 mV/dB dB/C dBm dBm dB mV/dB dB/C 240 mV MHz ns mA/A
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3dB Linearity Error, TA = -40C to 85C PIN = -48dBm to -14dBm, TA = -40C to 85C
60 44 0.007 -60 to 0
3dB Linearity Error, TA = -40C to 85C PIN = -48dBm to -14dBm, TA = -40C to 85C
60 41 0.008 -63 to -2
3dB Linearity Error, TA = -40C to 85C 31 PIN = -48dBm to -14dBm, TA = -40C to 85C 50 External Termination, TA = -40C to 85C -70
61 36.6 0.012 -64 -63 to -3
3dB Linearity Error, TA = -40C to 85C PIN = -48dBm to -14dBm, TA = -40C to 85C No RF Input Signal 30
60 35 0.025 142 32 30
Input from No Signal to -2dBm, to 90%
38 10/200
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LT5534
ELECTRICAL CHARACTERISTICS
Test circuit shown in Figure 1. (Note 2)
PARAMETER Power Up/Down Turn-On Time Turn-Off Time EN = High (On) EN = Low (Off) Power Supply Supply Voltage Supply Current Shutdown Current CONDITIONS
VCC = 3V, EN = 3V, TA = 25C, unless otherwise noted.
MIN TYP 200 800 0.9 0.6 2.7 5 5.25 9 10 MAX UNITS ns ns V V V mA A
EN = High EN = Low
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Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: Specifications over the -40C to 85C temperature range are assured by design, characterization and correlation with statistical process control.
Note 3: The linearity error is calculated by the difference between the incremental slope of the output and the average output slope from -48dBm to -14dBm. The dynamic range is defined as the range over which the linearity error is within 3dB.
TYPICAL PERFOR A CE CHARACTERISTICS (Test circuit shown in Figure 1)
Output Voltage vs Frequency
2.8 2.4 2.0 50MHz
VOUT (V)
VCC = 3V TA = 25C
LINEARITY ERROR (dB)
900MHz 1.9GHz 2.5GHz
1.6 1.2 0.8 0.4 0 -70 -60
0 2.5GHz -1 -2 -3 -70 1.9GHz
VOUT (V)
-50 -40 -30 -20 -10 RF INPUT POWER (dBm)
VOUT Variation vs RF Input Power
3 2 VOUT VARIATION (dB) 1 0 -1 -2 -3 -60 TA = -40C VCC = 3V AT 50MHz NORMALIZED AT 25C 2.4 2.0 1.6
1 0 -1 TA = 25C TA = 85C TA = -40C -50 -40 -30 -20 -10 RF INPUT POWER (dBm) 0 -2 -3
VOUT VARIATION (dB)
VOUT (V)
TA = 85C
-50
-40 -30 -20 -10 RF INPUT POWER (dBm)
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0
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Linearity Error vs Frequency
3 50MHz 2 900MHz 1
1.6 1.2 0.8 0.4
Output Voltage vs RF Input Power
2.4 2.0 VCC = 3V AT 50MHz 3 2
LINEARITY ERROR (dB)
VCC = 3V TA = 25C
1 0 -1 TA = 25C TA = 85C TA = -40C -50 -40 -30 -20 -10 RF INPUT POWER (dBm) 0 -2 -3
-60
-50 -40 -30 -20 -10 RF INPUT POWER (dBm)
0
0 -60
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Output Voltage vs RF Input Power
VCC = 3V AT 900MHz 3 2 3 2
VOUT Variation vs RF Input Power
VCC = 3V AT 900MHz NORMALIZED AT 25C
LINEARITY ERROR (dB)
1 0 -1 -2 -3 -60
TA = -40C TA = 85C
1.2 0.8 0.4 0 -60
0
-50
-40 -30 -20 -10 RF INPUT POWER (dBm)
0
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LT5534 TYPICAL PERFOR A CE CHARACTERISTICS (Test circuit shown in Figure 1)
Output Voltage vs RF Input Power
2.4 2.0 1.6 VOUT (V) 1.2 0.8 0.4 0 -60 TA = 25C TA = 85C TA = -40C -50 -40 -30 -20 -10 RF INPUT POWER (dBm) 0 VCC = 3V AT 1.9GHz 3 2 LINEARITY ERROR (dB) VOUT VARIATION (dB) 1 0 -1 -2 -3 3 2 1 0 -1 -2 -3 -60 TA = 85C VOUT (V) TA = -40C
VOUT Variation vs RF Input Power
3 2 VCC = 3V AT 2.5GHz NORMALIZED AT 25C
VOUT VARIATION (dB)
1 0 -1 -2 -3 -60
2.0
TA = -40C
50MHz VCC = 3V, 5V 1.9GHz VCC = 3V, 5V
PERCENTAGE DISTRIBUTION (%)
VOUT (V)
TA = 85C
-50
-40 -30 -20 -10 RF INPUT POWER (dBm)
Output Voltage Distribution vs Temperature
40 35 30 25 20 15 10 5 0 1.79 1.81 1.83 1.85 1.87 1.89 1.91 1.93 VOUT (V)
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RF PIN = -14dBm AT 1.9GHz VCC = 3V
PERCENTAGE DISTRIBUTION (%)
SUPPLY CURRENT (mA)
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VOUT Variation vs RF Input Power
VCC = 3V AT 1.9GHz NORMALIZED AT 25C 2.4 2.0 1.6 1.2 0.8 0.4
Output Voltage vs RF Input Power
VCC = 3V AT 2.5GHz 3 2 LINEARITY ERROR (dB) 1 0 -1 TA = 25C TA = 85C TA = -40C -50 -40 -30 -20 -10 RF INPUT POWER (dBm) 0 -2 -3
-50
-40 -30 -20 -10 RF INPUT POWER (dBm)
0
0 -60
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Output Voltage vs RF Input Power at VCC = 3V and 5V
2.8 2.4 TA = 25C
Output Voltage Distribution vs Temperature
35 RF P = -48dBm AT 1.9GHz IN VCC = 3V 30 25 20 15 10 5 0 0.54 0.56 0.58 0.6 0.62 0.64 0.66 0.68 0.7 VOUT (V)
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TA = 25C TA = -40C TA = 85C
1.6 1.2 0.8 0.4 0 -60
0
-50
-30 -10 -40 -20 RF INPUT POWER (dBm)
0
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Supply Voltage vs Supply Current
10 9 TA = 85C 8 TA = 25C 7 TA = -40C 6 5 4
TA = 25C TA = -40C TA = 85C
2.5
3
3.5 4 4.5 SUPPLY VOLTAGE (V)
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5.5
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LT5534 TYPICAL PERFOR A CE CHARACTERISTICS (Test circuit shown in Figure 1)
RF Input Return Loss vs Frequency
0 -5
1V/DIV
RETURN LOSS (dB)
-10 -15 -20 -25 -30
0
2.5 1 1.5 2 0.5 RF INPUT FREQUENCY (GHz)
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EN (Pin 1): Enable. When the input voltage is higher than 0.9V, the circuit is completely turned on. When the input voltage is less than 0.6V, the circuit is turned off. GND (Pins 2, 5): Ground. VOUT (Pin 3): RF Detector Output. VCC (Pin 4): Power Supply. This pin should be decoupled using 100pF and 0.1F capacitors. RF (Pin 6): RF input. This pin is internally biased to VCC - 0.18V. A coupling capacitor must be used to connect to the RF signal source.
BLOCK DIAGRA
DET RF LIMITER 6 RF
OFFSET COMP
2
GND
5
UW
DET
Output Transient Response
VOUT
RF INPUT
PULSED RF 0dBm AT 100MHz
3
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50ns/DIV
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4 VCC
DET RF LIMITER RF LIMITER
DET RF LIMITER
DET
+ -
VOUT
3
VREF BIAS
1
EN
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LT5534
TEST CIRCUIT
C1 1nF EN R2 0 OPTIONAL VOUT C5 OPTIONAL 6 RF LT5534 5 2 GND GND 1 EN 3 VOUT VCC 4 C3 100pF C2 0.1F
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R1 47 OPTIONAL
J1 RF
VCC
REF DES VALUE C1 1nF C2 0.1F C3 100pF C5 R1 47 R2 0
SIZE 0402 0603 0603 0603 0402 0603
PART NUMBER AVX 04025C102JAT2A TAIYO YUDEN TMK107BJ104KA AVX 06035C101KAT2A OPTIONAL OPTIONAL OPTIONAL
Figure 1. Evaluation Circuit Schematic
Figure 2. Component Side Silkscreen of Evaluation Board
Figure 3. Component Side Layout of Evaluation Board
APPLICATIO S I FOR ATIO
The LT5534 is a logarithmic-based detector, capable of measuring an RF signal over the frequency range from 50MHz to 3GHz. The 60dB linear dynamic range is achieved with very stable output over the full temperature range from -40C to 85C. The absolute variation over temperature is typically within 1dB over a 47dB dynamic range at 1.9GHz. RF Input Port The RF port is internally biased at VCC-0.18V. The pin should be DC blocked when connected to ground or other
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matching components. A 47 resistor (R1) connected to ground will provide better than 10dB input return loss up to 2.5GHz. An additional 2nH inductance in series with R1 will provide improved input matching up to 3GHz. The impedance vs frequency of the RF input is detailed in Table 1. The approximate linear RF input power range of the LT5534 is from -62dBm to -2dBm with a 50 source impedance. However, this range can be adjusted either upward or downward to tailor for a particular application
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APPLICATIO S I FOR ATIO
Table 1. RF Input Impedance
FREQUENCY (MHz) 50 100 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 INPUT IMPEDANCE () 1429-j429 947-j710 509-j609 250-j440 149-j344 96.8-j278 67.6-j229 49.7-j193 38.4-j165 30.8-j143 25.4-j125 21.4-j109 18.5-j96.2 16.6-j85.0 15.2-j75.7 13.7-j67.5 12.1-j60.1 MAG 0.938 0.934 0.922 0.908 0.900 0.896 0.893 0.889 0.883 0.879 0.873 0.866 0.862 0.848 0.834 0.826 0.822 S11 ANGLE (DEG) -1.1 -2.9 -5.6 -9.9 -14.1 -18.3 -22.7 -27.3 -32.3 -37.3 -42.6 -48.0 -53.6 -59.6 -65.6 -71.8 -78.2
OUTPUT CURRENTS FROM RF DETECTORS
need. By simply inserting an attenuator in front of the RF input, the power range is shifted higher by the amount of the attenuation. Moreover, due to the high RF input impedance of the LT5534, the detecting range can be moved downward for better detection sensitivity by using a narrow band L-C matching network. By this means, the sensitivity of the detector can be extended to as low as - 75dBm. By changing the value of resistor R1, the sensitivity of the detector can be fine-tuned within the range from -75dBm to -62dBm. Though the range is adjustable, the overall linear dynamic range remains the same. Output Interface The output interface of the LT5534 is shown in Figure 4. The output currents from the RF detectors are summed and converted into an output voltage, VOUT. The maximum charging current available to the output load is about 200A. The internal compensation capacitor CC is used to guarantee stable operation for a large capacitive output load. The slew rate is 133V/s, and the small-signal output bandwidth is approximately 30MHz when the output is resistively
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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VCC
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200A
+ -
CC VOUT
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Figure 4. Simplified Circuit Schematic of the Output Interface
terminated or open. The fastest output transient response is achieved when a large signal is applied to the RF input port. See the output transient response plot in the Typical Performance Characteristics section. When the output is terminated with a load capacitance CL, the slew rate is then limited to 200A/(CL + 1.5pF). For example, the slew rate is reduced to 17.4V/s when CL = 10pF. A capacitive load may result in output voltage overshoot, which can be minimized with a series compensation resistor R2 as shown in Figure 1. The suggested resistor values for various capacitive loads are listed in Table 2.
Table 2. Resistor Value for Capacitive Output
C5 (pF) 1.5 5 10 20 R2 (k) 5 4 2.5 2
The optional RC network at the output (R2 and C5 on the demo board) can also provide further output filtering, if needed. The output bandwidth is primarily dictated by the RC constant of this lowpass filter when its corner frequency is less than 30MHz. When a large signal (e.g., -2dBm) is present at the RF input port, the output voltage swing can be as high as 2.4V. To assure proper operation of the chip, the minimum resistive load at the output termination should be greater than 18k.
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LT5534
PACKAGE DESCRIPTIO
0.47 MAX
0.65 REF
3.26 MAX 2.1 REF
RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.10 - 0.40
0.10 - 0.30 NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 0.10 - 0.18 (NOTE 3) 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. DETAILS OF THE PIN 1 INDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE INDEX AREA 7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70
RELATED PARTS
PART NUMBER LT5504 LT5506 LT5511 LT5512 LT5515 LT5516 LT5517 LT5519 LT5520 LT5522 LTC(R)5532 LT5546 DESCRIPTION 800MHz to 2.7GHz RF Measuring Receiver 500MHz Quadrature IF Demodulator with VGA High Linearity Upconverting Mixer DC-3GHz High Signal Level Downconverting Mixer 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator 0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator 40MHz to 900MHz Direct Conversion Quadrature Demodulator 0.7GHz to 1.4GHz High Linearity Upconverting Mixer 1.3GHz to 2.3GHz High Linearity Upconverting Mixer 600MHz to 2.7GHz High Linearity Downconverting Mixer 300MHz to 7GHz Precision RF Power Detector 500MHz Quadrature IF Demodulator with VGA and 17MHz Baseband Bandwidth COMMENTS 80dB Dynamic Range, Temperature Compensated, 2.7V to 5.25V Supply 1.8V to 5.25V Supply, 40MHz to 500MHz IF, -4dB to 57dB Linear Power Gain, 8.8MHz Baseband Bandwidth RF Output to 3GHz, 17dBm IIP3, Integrated LO Buffer DC to 3GHz, 21dBm IIP3, Integrated LO Buffer 20dBm IIP3, Integrated LO Quadrature Generator 21.5dBm IIP3, Integrated LO Quadrature Generator 21dBm IIP3, Integrated LO Quadrature Generator 17.1dBm IIP3, 50 Single Ended RF and LO Ports 15.9dBm IIP3, 50 Single Ended RF and LO Ports 4.5V to 5.25V Supply, 25dBm IIP3 at 900MHz, NF = 12.5dB, 50 Single Ended RF and LO Ports Precision VOUT Offset Control, Adjustable Gain and Offset 17MHz Baseband Bandwidth, 40MHz to 500MHz IF, 1.8V to 5.25V Supply, -7dB to 56dB Linear Power Gain
5534f LT/TP 0404 1K * PRINTED IN THE USA
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Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
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SC6 Package 6-Lead Plastic SC70
(Reference LTC DWG # 05-08-1638)
1.80 - 2.20 (NOTE 4) 1.16 REF 0.96 MIN 1.80 - 2.40 1.15 - 1.35 (NOTE 4) INDEX AREA (NOTE 6) PIN 1 0.65 BSC 0.15 - 0.30 6 PLCS (NOTE 3) 0.80 - 1.00 0.00 - 0.10 REF 1.00 MAX
SC6 SC70 0802
www.linear.com
(c) LINEAR TECHNOLOGY CORPORATION 2004

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