LT5534

LT5534 - 50MHz to 3GHz RF Power Detector with 60dB Dynamic Range

Document overview

• Manufacturer or author: Linear Technology Corporation
• PDF pages: 10

Technical content

DESCRIPTION

The L T®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 pre - cisely 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 L T5534 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.

FEATURES

APPLICATIONS

n RF Frequency Range: 50MHz to 3GHz n Linear Dynamic Range: 60dB n Exceptional Accuracy over Temperature and Power Supply n Fast T ransient Response: 38ns Full-Scale Settling Time n Single 2.7V to 5.25V Supply n Low Supply Current: 7mA n Shutdown Current: 0.1µA n Tiny 6-Lead SC70 Package n RF RSSI and ACC n RF Power Control n CATV Power Detection n Optical Receiver Gain Control 50MHz to 3GHz RF Power Detector Output Voltage vs RF Input Power DETDETDETDETDET RF 1nF EN 47/uni03A9 ENABLE RF INPUT VOUT VCC GND 100pF L T5534 0.1µF VOUT

5534 TA01

RF INPUT POWER (dBm) –60 VOUT (V) LINEARITY ERROR (dB) 0.4 0.8 1.2 1.6 2.4 –50 –40 –30 –20

5534 TA01b

–10 0 2.0 TA = 25°C TA = 85°C TA = –40°C VCC = 3V AT 900MHz L, L T , L TC, L TM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

Operating Ambient Temperature Range ...–40°C to 85°C (Note 1) ELECTRICAL CHARACTERISTICS V CC = 3V , EN = 3V , TA = 25°C, source impedance = 50Ω, unless otherwise noted. Test circuit shown in Figure 1. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS RF Input Frequency Range 50 to 3000 MHz Input Impedance 2 kΩ fRF = 50MHz RF Input Power Range –58 to +2 dBm Dynamic Range (Note 3) ±3dB Linearity Error , TA = –40°C to 85°C 60 dB Output Slope 44 mV/dB Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.007 dB/°C fRF = 900MHz RF Input Power Range –60 to 0 dBm Dynamic Range (Note 3) ±3dB Linearity Error , TA = –40°C to 85°C 60 dB Output Slope 41 mV/dB Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.008 dB/°C fRF = 1900MHz RF Input Power Range –63 to –2 dBm Dynamic Range (Note 3) ±3dB Linearity Error , TA = –40°C to 85°C 61 dB Output Slope 31 36.6 43 mV/dB Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.012 dB/°C Output Intercept 50Ω External Termination, TA = –40°C to 85°C –70 –64 –58 dBm fRF = 2500MHz RF Input Power Range –63 to –3 dBm Dynamic Range (Note 3) ±3dB Linearity Error , TA = –40°C to 85°C 60 dB PIN CONFIGURATION EN 1 GND 2 VOUT 3 6 RF

5 GND

TJMAX = 125°C, θJA = 256°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE L T5534ESC6#PBF L T5534ESC6#TRPBF LBGD 6-Lead Plastic SC70 –40°C to 85°C Consult L TC Marketing for parts specified with wider operating temperature ranges. Consult L TC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear .com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear .com/tapeandreel/

ELECTRICAL CHARACTERISTICS

Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: Specifications over the –40°C to 85°C temperature range are assured by design, characterization and correlation with statistical process control. V CC = 3V , EN = 3V , TA = 25°C, source impedance = 50Ω, unless otherwise noted. Test circuit shown in Figure 1. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Power Up/Down Turn-On Time 200 ns Turn-Off Time 800 ns EN = High (On) 0.9 V EN = Low (Off) 0.6 V Power Supply Supply Voltage 2.7 5.25 V Supply Current EN = High 5 7 9 mA Shutdown Current EN = Low 0.1 10 µA 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 PERFORMANCE CHARACTERISTICS Output Voltage vs Frequency Linearity Error vs Frequency Output Voltage vs RF Input Power (Test circuit shown in Figure 1) RF INPUT POWER (dBm) –70 1.6 2.0 2.8 –40 –20

5534 G01

1.2 0.8 –60 –50 –30 –10 0 0.4 2.4 VOUT (V) VCC = 3V TA = 25°C 50MHz 1.9GHz 2.5GHz 900MHz RF INPUT POWER (dBm) –70 LINEARITY ERROR (dB) –40 –20

5534 G02

–60 –50 –30 –10 0 50MHz VCC = 3V TA = 25°C 900MHz 1.9GHz 2.5GHz RF INPUT POWER (dBm) –60 VOUT (V) LINEARITY ERROR (dB) 0.4 0.8 1.2 1.6 2.4 –50 –40 –30 –20

5534 G03

–10 0 2.0 TA = 25°C TA = 85°C TA = –40°C VCC = 3V AT 50MHz TYPICAL PERFORMANCE CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS Output Slope 35 mV/dB Output Variation vs Temperature PIN = –48dBm to –14dBm, TA = –40°C to 85°C 0.025 dB/°C Output Interface Output DC Voltage No RF Input Signal 0 142 380 mV Output Impedance 32 Ω Output Bandwidth 30 MHz Full-Scale Setting Time Input from No Signal to –2dBm, to 90% 38 ns Sinking/Sourcing 10/200 mA/µA VCC = 3V , EN = 3V , TA = 25°C, unless otherwise noted. Test circuit shown in Figure 1. (Note 2)

TYPICAL PERFORMANCE CHARACTERISTICS VOUT Variation vs RF Input Power Output Voltage vs RF Input Power VOUT Variation vs RF Input Power (Test circuit shown in Figure 1) RF INPUT POWER (dBm) –60 VOUT VARIATION (dB) –50 –40 –30 –20

5534 G04

–10 0 TA = –40°C TA = 85°C VCC = 3V AT 50MHz NORMALIZED AT 25°C RF INPUT POWER (dBm) –60 VOUT (V) LINEARITY ERROR (dB) 0.4 0.8 1.2 1.6 2.4 –50 –40 –30 –20

5534 G05

–10 0 2.0 TA = 25°C TA = 85°C TA = –40°C VCC = 3V AT 900MHz RF INPUT POWER (dBm) –60 VOUT VARIATION (dB) –50 –40 –30 –20

5534 G06

–10 0 TA = –40°C TA = 85°C VCC = 3V AT 900MHz NORMALIZED AT 25°C Output Voltage vs RF Input Power VOUT Variation vs RF Input Power Output Voltage vs RF Input Power RF INPUT POWER (dBm) –60 VOUT (V) LINEARITY ERROR (dB) 0.4 0.8 1.2 1.6 2.4 –50 –40 –30 –20

5534 G07

–10 0 2.0 TA = 25°C TA = 85°C TA = –40°C VCC = 3V AT 1.9GHz RF INPUT POWER (dBm) –60 VOUT VARIATION (dB) –50 –40 –30 –20

5534 G08

–10 0 TA = –40°C TA = 85°C VCC = 3V AT 1.9GHz NORMALIZED AT 25°C RF INPUT POWER (dBm) –60 VOUT (V) LINEARITY ERROR (dB) 0.4 0.8 1.2 1.6 2.4 –50 –40 –30 –20

5534 G09

–10 0 2.0 TA = 25°C TA = 85°C TA = –40°C VCC = 3V AT 2.5GHz

TYPICAL PERFORMANCE CHARACTERISTICS VOUT Variation vs RF Input Power Output Voltage vs RF Input Power at VCC = 3V and 5V Output Voltage Distribution vs Temperature Output Voltage Distribution vs Temperature Supply Voltage vs Supply Current (Test circuit shown in Figure 1) RF INPUT POWER (dBm) –60 VOUT VARIATION (dB) –50 –40 –30 –20

5534 G10

–10 0 TA = –40°C TA = 85°C VCC = 3V AT 2.5GHz NORMALIZED AT 25°C RF INPUT POWER (dBm) –60 1.6 2.0 2.8 –40 –20

5534 G11

1.2 0.8 –50 –30 –10 0 0.4 2.4 VOUT (V) TA = 25°C 50MHz VCC = 3V, 5V 1.9GHz VCC = 3V, 5V VOUT (V) PERCENTAGE DISTRIBUTION (%)5 0.54 0.62 0.66

5534 G12

RF PIN = –48dBm AT 1.9GHz VCC = 3V TA = 25°C TA = –40°C TA = 85°C VOUT (V) PERCENTAGE DISTRIBUTION (%)5 1.79 1.87 1.91

5534 G13

TA = 25°C TA = –40°C TA = 85°C RF PIN = –14dBm AT 1.9GHz VCC = 3V SUPPLY VOLTAGE (V) 2.5 SUPPLY CURRENT (mA) 3 3.5 4 4.5

5530 G14

5 5.5 TA = 85°C TA = 25°C TA = –40°C RF Input Return Loss vs Frequency Output T ransient Response RF INPUT FREQUENCY (GHz) –30 RETURN LOSS (dB) –25 –20 –15 –10 0.5 1 1.5 2

5534 G15

2.5 3 50ns/DIV 1V/DIV

5534 G16

voltage is less than 0.6V , the circuit is turned off. VOUT (Pin 3): RF Detector Output. using 100pF and 0.1µF capacitors. Figure 1. Evaluation Circuit Schematic

5534 F01

Figure 2. Component Side Silkscreen of Evaluation Board Figure 3. Component Side Layout of Evaluation Board R1 will provide improved input matching up to 3GHz. is from –62dBm to –2dBm with a 50Ω source impedance. Table 1. RF Input Impedance

linear dynamic range remains the same. The output interface of the L T5534 is shown in Figure 4. the Typical Performance Characteristics section. CL, the slew rate is then limited to 200µA/(C L + 1.5pF). Table 2. Resistor Value for Capacitive Output Figure 4. Simplified Circuit Schematic

5534 F04

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

REVISION HISTORY

REV DATE DESCRIPTION PAGE NUMBER B 8/10 Revised Output DC Voltage minimum and maximum values in Electrical Characteristics section 3 Updated package drawing in Package Description section 10 C 12/10 Corrected part numbers in Order Information 2 (Revision history begins at Rev B)

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com  LINEAR TECHNOLOGY CORPORA TION 2004 LT 1210 REV C • PRINTED IN USA RELATED PARTS PACKAGE DESCRIPTION PART NUMBER DESCRIPTION COMMENTS L T5504 800MHz to 2.7GHz RF Measuring Receiver 80dB Dynamic Range, Temperature Compensated, 2.7V to 5.25V Supply L T5506 500MHz Quadrature IF Demodulator with VGA 1.8V to 5.25V Supply, 40MHz to 500MHz IF , –4dB to 57dB Linear Power Gain, 8.8MHz Baseband Bandwidth L T5511 High Linearity Upconverting Mixer RF Output to 3GHz, 17dBm IIP3, Integrated LO Buffer L T5512 DC-3GHz High Signal Level Downconverting Mixer DC to 3GHz, 21dBm IIP3, Integrated LO Buffer L T5515 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator 20dBm IIP3, Integrated LO Quadrature Generator L T5516 0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator 21.5dBm IIP3, Integrated LO Quadrature Generator L T5517 40MHz to 900MHz Direct Conversion Quadrature Demodulator 21dBm IIP3, Integrated LO Quadrature Generator L T5519 0.7GHz to 1.4GHz High Linearity Upconverting Mixer 17.1dBm IIP3, 50Ω Single-Ended RF and LO Ports L T5520 1.3GHz to 2.3GHz High Linearity Upconverting Mixer 15.9dBm IIP3, 50Ω Single-Ended RF and LO Ports L T5522 600MHz to 2.7GHz High Linearity Downconverting Mixer 4.5V to 5.25V Supply, 25dBm IIP3 at 900MHz, NF = 12.5dB, 50Ω Single-Ended RF and LO Ports LT C 5532 300MHz to 7GHz Precision RF Power Detector Precision VOUT Offset Control, Adjustable Gain and Offset L T5546 500MHz Quadrature IF Demodulator with VGA and 17MHz Baseband Bandwidth 17MHz Baseband Bandwidth, 40MHz to 500MHz IF , 1.8V to 5.25V Supply, –7dB to 56dB Linear Power Gain 1.15 – 1.35 0.15 – 0.30

6 PLCS (NOTE 3)

1.80 – 2.20 (NOTE 4)

0.65 BSC

0.80 – 1.00

1.00 MAX

0.00 – 0.10 REF 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 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. DETAILS OF THE PIN 1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE INDEX AREA 7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70 8. JEDEC PACKAGE REFERENCE IS MO-203 VARIATION AB

2.8 BSC

0.47 MAX 0.65 REF RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR

1.8 REF

1.00 REF

(NOTE 6) 0.10 – 0.18 (NOTE 3) 0.26 – 0.46 GAUGE PLANE

0.15 BSC

0.10 – 0.40 6-Lead Plastic SC70 (Reference L TC DWG # 05-08-1638 Rev B)