LT MHz to 3GHz RF Power Detector. with 60dB Dynamic Range FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION

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1 LT554 5MHz to GHz RF Power Detector with 6dB Dynamic Range FEATURES n RF Frequency Range: 5MHz to GHz n Linear Dynamic Range: 6dB n Exceptional Accuracy over Temperature and Power Supply n Fast Transient Response: 8ns Full-Scale Settling Time n Single.7V to 5.5V Supply n Low Supply Current: 7mA n Shutdown Current:.µA n Tiny 6-Lead SC7 Package APPLICATIONS n RF RSSI and ACC n RF Power Control n CATV Power Detection n Optical Receiver Gain Control DESCRIPTION The LT 554 is a 5MHz to GHz monolithic RF power detector capable of measuring RF signals over a 6dB dynamic range. The RF signal in a decibel scale is precisely converted into DC voltage on a linear scale. The 6dB 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 LT554 delivers superior temperature stability (typical output variation within ±db over the full temperature range). The output responds in less than 4ns to a large RF input signal. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION RF INPUT 47Ω nf ENABLE LT554 RF EN 5MHz to GHz RF Power Detector V.µF pf V CC GND 554 TA Output Voltage vs RF Input Power V CC = V AT 9MHz T A = 5 C TA = 4 C TAb 554fc

2 LT554 ABSOLUTE MAXIMUM RATINGS (Note ) Power Supply Voltage...5.5V Enable Voltage...V, V CC RF Voltage (+dbm Equivalent)...±V Operating Ambient Temperature Range... 4 C to 85 C Storage Temperature Range C to 5 C Lead Temperature (Soldering, sec)... C PIN CONFIGURATION EN GND TOP VIEW 6 RF 5 GND 4 V CC SC6 PACKAGE 6-LEAD PLASTIC SC7 T JMAX = 5 C, θ JA = 56 C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT554ESC6#PBF LT554ESC6#TRPBF LBGD 6-Lead Plastic SC7 4 C to 85 C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: For more information on tape and reel specifications, go to: ELECTRICAL CHARACTERISTICS V CC = V, EN = V, T A = 5 C, source impedance = 5Ω, unless otherwise noted. Test circuit shown in Figure. (Note ) PARAMETER CONDITIONS MIN TYP MAX UNITS RF Input Frequency Range 5 to MHz Input Impedance kω f RF = 5MHz RF Input Power Range 58 to + dbm Dynamic Range (Note ) ±db Linearity Error, T A = 4 C to 85 C 6 db Output Slope 44 mv/db Output Variation vs Temperature P IN = 48dBm to 4dBm, T A = 4 C to 85 C.7 db/ C f RF = 9MHz RF Input Power Range 6 to dbm Dynamic Range (Note ) ±db Linearity Error, T A = 4 C to 85 C 6 db Output Slope 4 mv/db Output Variation vs Temperature P IN = 48dBm to 4dBm, T A = 4 C to 85 C.8 db/ C f RF = 9MHz RF Input Power Range 6 to dbm Dynamic Range (Note ) ±db Linearity Error, T A = 4 C to 85 C 6 db Output Slope mv/db Output Variation vs Temperature P IN = 48dBm to 4dBm, T A = 4 C to 85 C. db/ C Output Intercept 5Ω External Termination, T A = 4 C to 85 C dbm f RF = 5MHz RF Input Power Range 6 to dbm Dynamic Range (Note ) ±db Linearity Error, T A = 4 C to 85 C 6 db 554fc

3 ELECTRICAL CHARACTERISTICS noted. Test circuit shown in Figure. (Note ) Note : 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 : Specifications over the 4 C to 85 C temperature range are assured by design, characterization and correlation with statistical process control. LT554 V CC = V, EN = V, T A = 5 C, source impedance = 5Ω, unless otherwise PARAMETER CONDITIONS MIN TYP MAX UNITS Output Slope 5 mv/db Output Variation vs Temperature P IN = 48dBm to 4dBm, T A = 4 C to 85 C.5 db/ C Output Interface Output DC Voltage No RF Input Signal 4 8 mv Output Impedance Ω Output Bandwidth MHz Full-Scale Setting Time Input from No Signal to dbm, to 9% 8 ns Sinking/Sourcing / ma/µa V CC = V, EN = V, T A = 5 C, unless otherwise noted. Test circuit shown in Figure. (Note ) PARAMETER CONDITIONS MIN TYP MAX UNITS Power Up/Down Turn-On Time ns Turn-Off Time 8 ns EN = High (On).9 V EN = Low (Off).6 V Power Supply Supply Voltage V Supply Current EN = High ma Shutdown Current EN = Low. µa Note : The linearity error is calculated by the difference between the incremental slope of the output and the average output slope from 48dBm to 4dBm. The dynamic range is defined as the range over which the linearity error is within ±db. TYPICAL PERFORMANCE CHARACTERISTICS (Test circuit shown in Figure ) Output Voltage vs Frequency Linearity Error vs Frequency Output Voltage vs RF Input Power V CC = V T A = 5 C 9MHz 5MHz.9GHz.5GHz.5GHz 5MHz 9MHz.9GHz V CC = V T A = 5 C V CC = V AT 5MHz G G.4 6 T A = 5 C TA = 4 C G 554fc

4 LT554 TYPICAL PERFORMANCE CHARACTERISTICS (Test circuit shown in Figure ) Variation vs RF Input Power V CC = V AT 5MHz NORMALIZED AT 5 C.4. Output Voltage vs RF Input Power V CC = V AT 9MHz VARIATION (db) T A = 4 C T A = 5 C TA = 4 C G5 554 G4 Variation vs RF Input Power V CC = V AT 9MHz NORMALIZED AT 5 C.4. Output Voltage vs RF Input Power V CC = V AT.9GHz VARIATION (db) T A = 4 C T A = 5 C TA = 4 C G7 554 G6 Variation vs RF Input Power V CC = V AT.9GHz NORMALIZED AT 5 C.4. Output Voltage vs RF Input Power V CC = V AT.5GHz VARIATION (db) T A = 4 C T A = 5 C TA = 4 C G9 554 G fc

5 TYPICAL PERFORMANCE CHARACTERISTICS (Test circuit shown in Figure ) LT554 VARIATION (db) Variation vs RF Input Power V CC = V AT.5GHz NORMALIZED AT 5 C T A = 4 C VOUT (V) Output Voltage vs RF Input Power at V CC = V and 5V T A = 5 C 5MHz V CC = V, 5V.9GHz V CC = V, 5V PERCENTAGE DISTRIBUTION (%) Output Voltage Distribution vs Temperature RF P IN = 48dBm AT.9GHz V CC = V T A = 5 C T A = 4 C G G 554 G PERCENTAGE DISTRIBUTION (%) Output Voltage Distribution vs Temperature RF P IN = 4dBm AT.9GHz V CC = V T A = 5 C T A = 4 C SUPPLY CURRENT (ma) Supply Voltage vs Supply Current 9 8 T A = 5 C 7 T A = 4 C SUPPLY VOLTAGE (V) G 55 G4 RF Input Return Loss vs Frequency Output Transient Response 5 V/DIV RETURN LOSS (db) 5 5 RF INPUT PULSED RF dbm AT MHz RF INPUT FREQUENCY (GHz) 5ns/DIV 554 G6 554 G5 554fc 5

6 LT554 PIN FUNCTIONS EN (Pin ): Enable. When the input voltage is higher than.9v, the circuit is completely turned on. When the input voltage is less than.6v, the circuit is turned off. GND (Pins, 5): Ground. (Pin ): RF Detector Output. V CC (Pin 4): Power Supply. This pin should be decoupled using pf and.µf capacitors. RF (Pin 6): RF Input. This pin is internally biased to V CC.8V. A coupling capacitor must be used to connect to the RF signal source. BLOCK DIAGRAM 4 V CC 6 RF RF LIMITER RF LIMITER RF LIMITER RF LIMITER + V REF OFFSET COMP BIAS GND 5 EN 554 BD TEST CIRCUIT EN R Ω C5 EN RF LT554 GND GND V CC C nf C pf R 47Ω C.µF J RF V CC 554 F REF DES C C C C5 R R VALUE nf.µf pf 47Ω Ω SIZE PART NUMBER AVX 45CJATA TAIYO YUDEN TMK7BJ4KA AVX 65CKATA Figure. Evaluation Circuit Schematic 6 554fc

7 TEST CIRCUIT LT554 Figure. Component Side Silkscreen of Evaluation Board Figure. Component Side Layout of Evaluation Board APPLICATIONS INFORMATION The LT554 is a logarithmic-based detector, capable of measuring an RF signal over the frequency range from 5MHz to GHz. The 6dB linear dynamic range is achieved with very stable output over the full temperature range from 4 C to 85 C. The absolute variation over temperature is typically within ±db over a 47dB dynamic range at.9ghz. RF Input Port The RF port is internally biased at V CC -.8V. The pin should be DC blocked when connected to ground or other matching components. A 47Ω resistor (R) connected to ground will provide better than db input return loss up to.5ghz. An additional nh inductance in series with R will provide improved input matching up to GHz. The impedance vs frequency of the RF input is detailed in Table. The approximate linear RF input power range of the LT554 is from 6dBm to dbm with a 5Ω source impedance. However, this range can be adjusted either upward or Table. RF Input Impedance FREQUENCY (MHz) INPUT IMPEDANCE (Ω) MAG S ANGLE (DEG) 5 49-j j j j j j j j j j j j j j j j j fc 7

8 LT554 APPLICATIONS INFORMATION downward to tailor for a particular application 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 LT554, 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 R, the sensitivity of the detector can be fine-tuned within the range from 75dBm to 6dBm. Though the range is adjustable, the overall linear dynamic range remains the same. Output Interface The output interface of the LT554 is shown in Figure 4. The output currents from the RF detectors are summed and converted into an output voltage,. The maximum charging current available to the output load is about µa. The internal compensation capacitor C C is used to guarantee stable operation for a large capacitive output load. The slew rate is V/µs, and the small-signal output bandwidth is approximately MHz when the output is resistively 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 C L, the slew rate is then limited to µa/(c L +.5pF). For example, the slew rate is reduced to 7.4V/µs when C L = pf. A capacitive load may result in output voltage overshoot, which can be minimized with a series compensation resistor R, as shown in Figure. The suggested resistor values for various capacitive loads are listed in Table. Table. Resistor Value for Capacitive Output C5 (pf) R (kω) The optional RC network at the output (R 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 MHz. When a large signal (e.g., dbm) is present at the RF input port, the output voltage swing can be as high as.4v. To assure proper operation of the chip, the minimum resistive load at the output termination should be greater than 8kΩ. V CC + C C + µa 554 F4 OUTPUT CURRENTS FROM RF ECTORS Figure 4. Simplified Circuit Schematic of the Output Interface 8 554fc

9 LT554 REVISION HISTORY (Revision history begins at Rev B) REV DATE DESCRIPTION PAGE NUMBER B 8/ Revised Output DC Voltage minimum and maximum values in Electrical Characteristics section Updated package drawing in Package Description section C / Corrected part numbers in Order Information 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. 554fc 9

10 LT554 PACKAGE DESCRIPTION SC6 Package 6-Lead Plastic SC7 (Reference LTC DWG # Rev B).47 MAX.65 REF.8. (NOTE 4). REF.8 BSC.8 REF (NOTE 4) INDEX AREA (NOTE 6) PIN RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR BSC PLCS (NOTE ) GAUGE PLANE.5 BSC. MAX.. REF (NOTE ) NOTE:. DIMENSIONS ARE IN MILLIMETERS. DRAWING NOT TO SCALE. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED.54mm 6. AILS OF THE PIN IDENTIFIER ARE, BUT MUST BE LOCATED WITHIN THE INDEX AREA 7. EIAJ PACKAGE REFERENCE IS EIAJ SC-7 8. JEDEC PACKAGE REFERENCE IS MO- VARIATION AB SC6 SC7 5 REV B RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT554 8MHz to.7ghz RF Measuring Receiver 8dB Dynamic Range, Temperature Compensated,.7V to 5.5V Supply LT556 5MHz Quadrature IF Demodulator with VGA.8V to 5.5V Supply, 4MHz to 5MHz IF, 4dB to 57dB Linear Power Gain, 8.8MHz Baseband Bandwidth LT55 High Linearity Upconverting Mixer RF Output to GHz, 7dBm IIP, Integrated LO Buffer LT55 DC-GHz High Signal Level Downconverting Mixer DC to GHz, dbm IIP, Integrated LO Buffer LT555.5GHz to.5ghz Direct Conversion Quadrature Demodulator dbm IIP, Integrated LO Quadrature Generator LT556.8GHz to.5ghz Direct Conversion Quadrature Demodulator.5dBm IIP, Integrated LO Quadrature Generator LT557 4MHz to 9MHz Direct Conversion Quadrature Demodulator dbm IIP, Integrated LO Quadrature Generator LT559.7GHz to.4ghz High Linearity Upconverting Mixer 7.dBm IIP, 5Ω Single-Ended RF and LO Ports LT55.GHz to.ghz High Linearity Upconverting Mixer 5.9dBm IIP, 5Ω Single-Ended RF and LO Ports LT55 6MHz to.7ghz High Linearity Downconverting Mixer 4.5V to 5.5V Supply, 5dBm IIP at 9MHz, NF =.5dB, 5Ω Single-Ended RF and LO Ports LTC 55 MHz to 7GHz Precision RF Power Detector Precision Offset Control, Adjustable Gain and Offset LT5546 5MHz Quadrature IF Demodulator with VGA and 7MHz Baseband Bandwidth 7MHz Baseband Bandwidth, 4MHz to 5MHz IF,.8V to 5.5V Supply, 7dB to 56dB Linear Power Gain LT REV C PRINTED IN USA Linear Technology Corporation 6 McCarthy Blvd., Milpitas, CA (48) 4-9 FAX: (48) LINEAR TECHNOLOGY CORPORATION 4 554fc

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