LT5538 - 40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range
Document overview
- Manufacturer or author: Linear Technology Corporation
- PDF pages: 12
Technical content
FEATURES
APPLICATIONS
DESCRIPTION
40MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range The L T®5538 is a 40MHz to 3800MHz monolithic logarith- mic RF power detector , capable of measuring RF signals over a wide dynamic range, from –75dBm to 10dBm. The RF signal in an equivalent decibel-scaled value is precisely converted into DC voltage on a linear scale. The wide linear dynamic range is achieved by measuring the RF signal us- ing cascaded RF limiters and RF detectors. Their outputs are summed to generate an accurate linear DC voltage proportional to the input RF signal in dBm. The L T5538 delivers superior temperature stable output (within ±1dB over full temperature range) from 40MHz to 3.8GHz. The output is buffered with a low impedance driver . 40MHz - 3.8GHz Logarithmic RF Detector ■ Frequency Range: 40MHz to 3.8GHz ■ 75dB Log Linear Dynamic Range ■ Exceptional Accuracy over Temperature ■ Linear DC Output vs. Input Power in dBm ■ –72dBm Detection Sensitivity ■ Single-ended RF Input ■ Low Supply Current: 29mA ■ Supply Voltage: 3V to 5.25V ■ 8-lead DFN 3mm × 3mm package ■ Received Signal Strength Indication (RSSI) ■ RF Power Measurement and Control ■ RF/IF Power Detection ■ Receiver RF/IF Gain Control ■ Envelope Detection ■ ASK Receiver Output Voltage and Linearity Error vs Input Power IN– ENBLEN VOUT 100pF 0.1μF IN+ GND CAP– OUT CAP+ VCC L T5538
5538 TA01
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.
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INPUT POWER (dBm) –75 VOUT (V) LINEARITY ERROR (dB) 0.2 0.5 0.8 1.1 1.4 2.0 1.7 TA = –40°C TA = 25°C TA = 85°C VCC = 5V AT 880 MHz
PIN CONFIGURATIONABSOLUTE MAXIMUM RATINGS (Note 1) ORDER INFORMATION ELECTRICAL CHARACTERISTICS The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C, VCC = 5V , ENBL = 5V . (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS RF Input Input Frequency Range 40 to 3800 MHz DC Common Mode Voltage VCC –0.5 V Input Resistance 394 Ω fRF = 40 MHZ RF Input Power Range –75 to 10 dBm Linear Dynamic Range ±1dB Linearity Error (Note 3) 76 dB Output Slope 19.9 mV/dB Logarithmic Intercept (Note 5) –87.5 dBm Sensitivity –72 dBm Output Variation vs Temperature Normalized to Output at 25°C P IN = –50dBm; –40°C < TA < 85°C PIN = –30dBm; –40°C < TA < 85°C PIN = –10dBm; –40°C < TA < 85°C 0.1/0.6 –0.1/0.6 –0.2/0.6 dB dB dB LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE L T5538IDD#PBF L T5538IDD#TRPBF LCVG 8-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C Consult L TC Marketing for parts specifi ed with wider operating temperature ranges. Consult L TC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: http://www.linear .com/leadfree/ For more information on tape and reel specifi cations, go to: http://www.linear .com/tapeandreel/ TOP VIEW DD PACKAGE 8-LEAD (3mm × 3mm) PLASTIC DFN
1 ENBL
IN– GND OUT CAP+ CAP– VCC θJA = 43°C/W EXPOSED PAD (PIN 9) SHOULD BE SOLDERED TO PCB
ELECTRICAL CHARACTERISTICS The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C, VCC = 5V , ENBL = 5V . (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 2nd Order Harmonic Distortion Pin = –10dBm; At RF Input –62 dBc 3rd Order Harmonic Distortion Pin = –10dBm; At RF Input –61 dBc fRF = 450 MHz RF Input Power Range –75 to 10 dBm Linear Dynamic Range ±1 dB Linearity Error (Note 3) 75 dB Output Slope 19.6 mV/dB Logarithmic Intercept (Note 5) –87.3 dBm Sensitivity –71.5 dBm Output Variation vs Temperature Normalized to Output at 25°C P IN = –50dBm; –40°C < TA < 85°C PIN = –30dBm; –40°C < TA < 85°C PIN = –10dBm; –40°C < TA < 85°C 0.1/0.6 0.1/0.5 –0.1/0.5 dB dB dB 2nd Order Harmonic Distortion Pin = –10dBm; At RF Input –43 dBc 3rd Order Harmonic Distortion Pin = –10dBm; At RF Input –44 dBc f RF = 880 MHz RF Input Power Range –75 to 10 dBm Linear Dynamic Range ±1 dB Linearity Error (Note 3) 75 dB Output Slope 19.0 mV/dB Logarithmic Intercept (Note 5) –88.8 dBm Sensitivity –71.5 dBm Output Variation vs Temperature Normalized to Output at 25°C P IN = –50dBm; –40°C < TA < 85°C PIN = –30dBm; –40°C < TA < 85°C PIN = –10dBm; –40°C < TA < 85°C 0.1/0.7 0.1/0.4 0.1/0.4 dB dB dB 2nd Order Harmonic Distortion Pin = –10dBm; At RF Input –37 dBc 3rd Order Harmonic Distortion Pin = –10dBm; At RF Input –40 dBc f RF = 2140 MHz RF Input Power Range –72 to 10 dBm Linear Dynamic Range ±1 dB Linearity Error (Note 3) 70 dB Output Slope 17.7 mV/dB Logarithmic Intercept (Note 5) –89.0 dBm Sensitivity –69.0 dBm Output Variation vs Temperature Normalized to Output at 25°C P IN = –50dBm; –40°C < TA < 85°C PIN = –30dBm; –40°C < TA < 85°C PIN = –10dBm; –40°C < TA < 85°C 0.3/0.4 0.4/0.1 0.7/0.5 dB dB dB f RF = 2700 MHz RF Input Power Range –72 to 10 dBm Linear Dynamic Range ±1 dB Linearity Error (Note 3) 65 dB Output Slope 17.6 mV/dB Logarithmic Intercept (Note 5) –87.5 dBm
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: Specifi cations over the –40°C to 85°C 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 slope from –50dBm to –20dBm. The dynamic range is defi ned as the range over which the linearity error is within ±1dB. Note 4: Sensitivity is defi ned as the minimum input power required for the linearity error within 3dB of the ideal log-linear transfer curve. Note 5: Logarithmic Intercept is an extrapolated input power level from the best-fi tted log-linear straight line, where the output voltage is 0V . SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Sensitivity –69.5 dBm Output Variation vs Temperature Normalized to Output at 25°C P IN = –50dBm; –40°C < TA < 85°C PIN = –30dBm; –40°C < TA < 85°C PIN = –10dBm; –40°C < TA < 85°C 0.3/0.3 0.7/–0.3 1.1/–0.9 dB dB dB f RF = 3600 MHz RF Input Power Range –65 to 10 dBm Linear Dynamic Range ±1 dB Linearity Error (Note 3) 57 dB Output Slope 18 mV/dB Logarithmic Intercept (Note 5) –81.4 dBm Sensitivity –63 dBm Output Variation vs Temperature Normalized to Output at 25°C P IN = –45dBm; –40°C < TA < 85°C PIN = –25dBm; –40°C < TA < 85°C PIN = –5dBm; –40°C < TA < 85°C 0.6/–0.3 0.9/–0.6 1.4/–1.2 dB dB dB Output Interface Output DC Voltage No RF Signal Present 0.350 V Output Impedance 150 Ω Source Current 10 mA Sink Current 200 μA Rise Time 0.5V to 1.6V , 10% to 90%, f RF = 880 MHz 100 ns Fall Time 1.6V to 0.5V , 10% to 90%, f RF = 880 MHz 180 ns Power Up/Down ENBL = High (On) ● 1V ENBL = Low (Off) ● 0.3 V ENBL Input Current VENBL = 5V 205 μA Turn ON time 300 ns Turn OFF Time 1μ s Power Supply Supply Voltage 3 5.25 V Supply Current 29 36 mA Shutdown Current ENBL = Low 1 100 μA ELECTRICAL CHARACTERISTICS The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C, VCC = 5V , ENBL = 5V . (Note 2)
TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage Output Voltage, Linearity Error vs Input Power at 40MHz VOUT Variation vs Input Power at 40MHz Output Voltage, Linearity Error vs Input Power at 450MHz Output Voltage, Linearity Error vs Input Power at 2.14GHz VOUT Variation vs Input Power at 2.14GHz (Test Circuit shown in Figure 5) VOUT Variation vs Input Power at 450MHz Output Voltage, Linearity Error vs Input Power at 880MHz VOUT Variation vs Input Power at 880MHz
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SUPPLY VOLTAGE VCC (V) 2.5 SUPPLY CURRENT ICC (mA) 3 3.5 4 4.5 5 5.5 TA = –40°C TA = 25°C TA = 85°C
5538 G02
INPUT POWER (dBm) –75 0.2 VOUT (V) LINEARITY ERROR (dB) 0.5 0.8 1.1 1.4 2.0 1.7 TA = –40°C TA = 25°C TA = 85°C VCC = 5V
5538 G03
INPUT POWER (dBm) –75 VOUT VARIATION (dB) TA = –40°C TA = 85°C VCC = 5V NORMALIZED AT 25°C
5538 G04
INPUT POWER (dBm) –75 VOUT (V) LINEARITY ERROR (dB) 0.2 0.5 0.8 1.1 1.4 2.0 1.7 TA = –40°C TA = 25°C TA = 85°C VCC = 5V
5538 G05
INPUT POWER (dBm) –75 VOUT VARIATION (dB) TA = –40°C TA = 85°C VCC = 5V NORMALIZED AT 25°C
5538 G06
INPUT POWER (dBm) –75 VOUT (V) LINEARITY ERROR (dB) 0.2 0.5 0.8 1.1 1.4 2.0 1.7 TA = –40°C TA = 25°C TA = 85°C VCC = 5V
5538 G07
INPUT POWER (dBm) VOUT VARIATION (dB) TA = –40°C TA = 85°C VCC = 5V NORMALIZED AT 25°C
5538 G08
INPUT POWER (dBm) –75 VOUT (V) LINEARITY ERROR (dB) 0.2 0.5 0.8 1.1 1.4 2.0 1.7 TA = –40°C TA = 25°C TA = 85°C VCC = 5V
5538 G09
INPUT POWER (dBm) VOUT VARIATION (dB) TA = –40°C TA = 85°C VCC = 5V NORMALIZED AT 25°C
TYPICAL PERFORMANCE CHARACTERISTICS VOUT Variation vs Input Power at 2.7GHz Output Voltage, Linearity Error vs Input Power at 3.6GHz VOUT Variation vs Input Power at 3.6GHz Slope Distribution vs Temperature at 2.14GHz Output Voltage, Linearity Error vs Input Power at 2.7GHz Logarithmic Intercept Distribution vs Temperature at 2.14GHz (Test Circuit shown in Figure 5)
5538 G10
INPUT POWER (dBm) –70 VOUT (V) LINEARITY ERROR (dB) 0.3 0.6 0.9 1.2 1.8 1.5 TA = –40°C TA = 25°C TA = 85°C VCC = 5V
5538 G11
INPUT POWER (dBm) VOUT VARIATION (dB) TA = –40°C TA = 85°C VCC = 5V NORMALIZED AT 25°C
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INPUT POWER (dBm) VOUT (V) LINEARITY ERROR (dB) 0.3 0.6 0.9 1.2 1.8 1.5 TA = –40°C TA = 25°C TA = 85°C VCC = 5V
5538 G13
INPUT POWER (dBm) VOUT VARIATION (dB) TA = –40°C TA = 85°C VCC = 5V NORMALIZED AT 25°C Output Voltage, Linearity Error vs VCC @40MHz Output Voltage, Linearity Error vs VCC @2140MHz Output Voltage, Linearity Error vs VCC @3600MHz
5538 G16
INPUT POWER (dBm) –75 VOUT (V) LINEARITY ERROR (dB) 0.2 0.5 0.8 1.1 1.4 2.0 1.7 VCC = 5V VCC = 3V NORMALIZED AT 5V
5538 G17
INPUT POWER (dBm) –75 VOUT (V) LINEARITY ERROR (dB) 0.2 0.5 0.8 1.1 1.4 2.0 1.7 VCC = 5V VCC = 3V NORMALIZED AT 5V
5538 G18
INPUT POWER (dBm) VOUT (V) LINEARITY ERROR (dB) 0.3 0.6 0.9 1.2 1.8 1.5 VCC = 5V VCC = 3V VCC = 5V
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LOGARITHMIC INTERCEPT (dBm) PERCENTAGE DISTRIBUTION (%)
16 TA = –40°C
TA = 25°C TA = 85°C
5538 G14
SLOPE (mV/dB) PERCENTAGE DISTRIBUTION (%)
40 TA = –40°C
TA = 25°C TA = 85°C
ENBL (Pin 1): Enable Pin. An applied voltage above 1V will activate the bias for the IC. For an applied voltage below 0.3V, the circuits will be shut down (disabled) with a cor- responding reduction in power supply current. If the enable function is not required, then this pin can be connected to V CC. Typical enable pin input currents are 100μA for EN = 3V and 200μA for EN = 5V , respectively. Note that at no time should the ENBL pin voltage be allowed to exceed V CC by more than 0.3V . IN+ (Pin 2): RF Input Pin. The pin is internally biased to VCC –0.5V and should be DC blocked externally. The input is connected via internal 394Ω resistor to the IN– pin which should be connected to ground with an ac-decoupling capacitor . IN – (Pin 3): AC Ground Pin. The pin is internally biased to VCC –0.5V and coupled to ground via internal 20pF capacitor . This pin should be connected to ground with an external ac-decoupling capacitor for low frequency operation. GND (Pin 4, Exposed Pad Pin 9): Circuit Ground Return for the entire IC. This pin must be soldered to the printed circuit board ground plane. V CC (Pin 5): Power Supply Pin. This pin should be de- coupled using 100pF and 0.1μF capacitors. CAP–, CAP+ (Pins 6, 7): Optional Filter Capacitor Pins. These pins are internally connected to the detector outputs in front of the output buffer amplifi er . An external low-pass fi ltering can be formed by connecting a capacitor to Vcc from each pin for fi ltering a low frequency modulation sig- nal. See the Applications Information section for detail. OUT (Pin 8): Detector DC Output Pin. BLOCK DIAGRAM RF LIMITER IN+ IN– GND RF LIMITER RF DETECTOR CELLS DC OFFSET CANCELLATION RF LIMITER RF LIMITER RF LIMITER CAP– CAP+ 4 9 7 6 OUT 8 ENBL 1 VCC 5
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Figure 1. The IN connect this pin to ground for low frequency operation. Table 1. RF Input Impedance
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Figure 1. Simplifi ed Schematic of the Input Circuit Figure 2. Input Return Loss with Additional LC Matching Network
5538 F02
The output interface of the L T5538 is shown in Figure 3. input power levels are shown in Figure 4. 29.5kΩ referenced to ground. Figure 3. These two pins are connected to the differential abnormal start-up condition. Figure 3. Simplifi ed Schematic of the Output Interface Figure 4. Simplifi ed Circuit Schematic of the Output Interface
5538 F03
5538 F04
upper ESD protection diode connected at the ENBL pin. pin. If this occurs, damage to the IC may result. Figure 5. Simplifi ed Schematic of the Enable Circuit Figure 6. Evaluation Board Circuit Schematic
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Figure 7. Component Side of Evalution Board
- DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
- ALL DIMENSIONS ARE IN MILLIMETERS
- DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
- EXPOSED PAD SHALL BE SOLDER PLATED
- SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
0.200 REF
0.50 BSC
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com © LINEAR TECHNOLOGY CORPORATION 2008 LT 0408 • PRINTED IN USA RELATED PARTS PART NUMBER DESCRIPTION COMMENTS Infrastructure L T5514 Ultralow Distortion, IF Amplifi er/ADC Driver with Digitally Controlled Gain 850MHz Bandwidth, 47 dBm OIP3 at 100MHz, 10.5dB to 33dB Gain Control Range LT5515 1.5GHz to 2.5GHz Direct Conversion Quadrature Demodulator 20dBm IIP3, Integrated LO Quadrature Generator LT5516 0.8GHz to 1.5GHz Direct Conversion Quadrature Demodulator 21.5dBm IIP3, Integrated LO Quadrature Generator L T5517 40MHz to 900MHz Quadrature Demodulator 21dBm IIP3, Integrated LO Quadrature Generator L T5518 1.5GHz to 2.4GHz High Linearity Direct Quadrature Modulator 22.8dBm OIP3 at 2GHz, –158.2dBm/Hz Noise Floor , 50Ω Single-Ended RF and LO Ports, 4-Channel W-CDMA ACPR = –64dBc at 2.14GHz L T5519 0.7GHz to 1.4GHz High Linearity Upconverting Mixer 17.1dBm IIP3 at 1GHz, Integrated RF Output T ransformer with 50Ω Matching, Single-Ended LO and RF Ports Operation L T5520 1.3GHz to 2.3GHz High Linearity Upconverting Mixer 15.9dBm IIP3 at 1.9GHz, Integrated RF Output T ransformer with 50Ω Matching, Single-Ended LO and RF Ports Operation Ended LO Port Operation L T5522 600 MHz to 2.7GHz High Signal Level Downconverting Mixer 4.5V to 5.25V Supply, 25dBm IIP3 at 900MHz, NF = 12.5dB, 50Ω Single- Ended RF and LO Ports L T5524 Low Power , Low Distortion ADC Driver with Digitally Programmable Gain 450MHz Bandwidth, 40dBm OIP3, 4.5dB to 27dB Gain Control L T5525 High Linearity, Low Power Downconverting Mixer Single-Ended 50Ω RF and LO Ports, 17.6dBm IIP3 at 1900MHz, I CC = 28mA L T5526 High Linearity, Low Power Downconverting Mixer 3V to 5.3V Supply, 16.5dBm IIP3, 100kHz to 2GHz RF , NF = 11dB, ICC = 28mA, –65dBm LO-RF Leakage L T5527 400MHz to 3.7GHz High Signal Level Downconverting Mixer IIP3 = 23.5dBm and NF = 12.5dBm at 1900MHz, 4.5V to 5.25V Supply, ICC = 78mA, Conversion Gain = 2dB L T5528 1.5GHz to 2.4GHz High Linearity Direct Quadrature Modulator 21.8dBm OIP3 at 2GHz, –159.3dBm/Hz Noise Floor , 50Ω, 0.5VDC Baseband Interface, 4-Channel W-CDMA ACPR = –66dBc at 2.14GHz L T5557 400MHz to 3.8GHz, 3.3V High Signal Level Downconverting Mixer IIP3 = 23.7dBm at 2600MHz, 23.5dBm at 3600MHz, ICC = 82mA at 3.3V L T5560 Ultra-Low Power Active Mixer 10mA S upply Current, 10dBm IIP3, 10dB NF , Usable as Up- or Down-Converter. L T5568 700MHz to 1050MHz High Linearity Direct Quadrature Modulator 22.9dBm OIP3 at 850MHz, –160.3dBm/Hz Noise Floor , 50Ω, 0.5VDC Baseband Interface, 3-Ch CDMA2000 ACPR = –71.4dBc at 850MHz L T5572 1.5GHz to 2.5GHz High Linearity Direct Quadrature Modulator 21.6dBm OIP3 at 2GHz, –158.6dBm/Hz Noise Floor , High-Ohmic 0.5VDC Baseband Interface, 4-Ch W-CDMA ACPR = –67.7dBc at 2.14GHz L T5575 800MHz to 2.7GHz High Linearity Direct Conversion I/Q Demodulator 50Ω, Single-Ended RF and LO Inputs. 28dBm IIP3 at 900MHz, 13.2dBm P1dB, 0.04dB I/Q Gain Mismatch, 0.4° I/Q Phase Mismatch RF Power Detectors LT C 5505 RF Power Detectors with >40dB Dynamic Range 300MHz to 3GHz, Temperature Compensated, 2.7V to 6V Supply L TC5507 100kHz to 1000MHz RF Power Detector 100kHz to 1GHz, Temperature Compensated, 2.7 to 6V Supply L TC5508 300MHz to 7GHz RF Power Detector 44dB Dynamic Range, Temperature Compensated, SC70 Package L TC5509 300MHz to 3GHz RF Power Detector 36dB Dynamic Range, Low Power Consumption, SC70 Package L TC5530 300MHz to 7GHz Precision RF Power Detector Precision V OUT Offset Control, Shutdown, Adjustable Gain L TC5531 300MHz to 7GHz Precision RF Power Detector Precision V OUT Offset Control, Shutdown, Adjustable Offset L TC5532 300MHz to 7GHz Precision RF Power Detector Precision V OUT Offset Control, Adjustable Gain and Offset L T5534 50MHz to 3GHz Log RF Power Detector with 60dB Dynamic Range ±1dB Output Variation over Temperature, 38ns Response Time, Log Linear Response L TC5536 Precision 600Mhz to 7GHz RF Power Detector with Fast Comparator Output 25ns Response Time, Comparator Reference Input, Latch Enable Input, –26dBm to +12dBm Input Range L T5537 Wide Dynamic Range Log RF/IF Detector Low Frequency to 1GHz, 83dB Log Linear Dynamic Range L T5570 2.7GHz RMS Power Detector Fast Responding, up to 60dB Dynamic Range, ±0.3dB Accuracy Over Temperature and Dynamic Range