lt5538 Linear Technology Corporation, lt5538 Datasheet
lt5538
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lt5538 Summary of contents
Page 1
... 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 LT5538 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 ...
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... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT5538IDD#PBF LT5538IDD#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi ...
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... T < 85° –30dBm; –40°C < T < 85° –10dBm; –40°C < T < 85° ±1 dB Linearity Error (Note 3) (Note 5) LT5538 MIN TYP MAX UNITS –62 dBc –61 dBc – dBm 75 19.6 mV/dB –87.3 dBm –71.5 dBm ● ...
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... LT5538 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER Sensitivity Output Variation vs Temperature f = 3600 MHz RF RF Input Power Range Linear Dynamic Range Output Slope Logarithmic Intercept Sensitivity Output Variation vs Temperature Output Interface Output DC Voltage Output Impedance Source Current ...
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... T = –40°C 0.5 – 25° 85°C A 0.2 –3 –75 –65 –55 –45 –35 –25 –15 –5 5 INPUT POWER (dBm) 5538 G08 LT5538 V Variation vs Input Power at OUT 40MHz NORMALIZED AT 25° –1 – –40° 85°C A –3 – ...
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... LT5538 TYPICAL PERFORMANCE CHARACTERISTICS Output Voltage, Linearity Error vs Input Power at 2.7GHz 1 1.5 2 1.2 1 0.9 0 0.6 – –40°C 0.3 – 25° 85° –3 –70 –60 –50 –40 –30 –20 – INPUT POWER (dBm) 5538 G10 V Variation vs Input Power at OUT 3 ...
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... Vcc pin which 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. DC OFFSET CANCELLATION RF LIMITER RF LIMITER RF LIMITER RF DETECTOR CELLS LT5538 ENBL 8 OUT 6 7 5538 BD01 – ...
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... LT5538 APPLICATIONS INFORMATION The LT5538 is a 40MHz to 3.8 GHz logarithmic RF power detector. It consists of cascaded limiting amplifi ers and RF detectors. The output currents from every RF detector are combined and low-pass fi ltered before applied to the output buffer amplifi er result, the fi nal DC output voltage approximates the logarithm of the amplitude of the input signal ...
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... APPLICATIONS INFORMATION OUTPUT INTERFACE The output interface of the LT5538 is shown in Figure 3. This output buffer circuit can source 10mA current to the load and sink 200 μA current from the load. The small- signal output bandwidth is approximately 4MHz when the output is resistively terminated or open. The full-scaled 10% to 90% rise and fall times are 100nS and 180nS, respectively ...
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... A simplifi ed circuit schematic of the ENBL Pin is shown in Figure 5. The enable voltage necessary to turn on the LT5538 is 1V. The current drawn by the ENBL pin varies with the voltage applied at the pin. When the ENBL volt- age is 3V, the ENBL current is typically 100 μA. When the ...
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... ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON TOP AND BOTTOM OF PACKAGE LT5538 5538 TC02 R = 0.115 TYP 5 8 3.00 ± ...
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... LT5538 RELATED PARTS PART NUMBER DESCRIPTION Infrastructure LT5514 Ultralow Distortion, IF Amplifi er/ADC Driver with Digitally Controlled Gain 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 ...