LT MHz to 3.8GHz RF Power Detector with 75dB Dynamic Range FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION

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1 FEATURES Frequency Range: 4MHz to.8ghz 75 Log Linear Dynamic Range Exceptional Accuracy over Temperature Linear DC Output vs. Input Power in m 7m Detection Sensitivity Single-ended RF Input Low Supply Current: 9mA Supply Voltage: V to 5.5V 8-lead DFN mm mm package APPLICATIONS Received Signal Strength Indication (RSSI) RF Power Measurement and Control RF/IF Power Detection Receiver RF/IF Gain Control Envelope Detection ASK Receiver DESCRIPTION LT558 4MHz to.8ghz RF Power Detector with 75 Dynamic Range The LT 558 is a 4MHz to 8MHz monolithic logarithmic RF power detector, capable of measuring RF signals over a wide dynamic range, from m to m. 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 using cascaded RF limiters and RF detectors. Their outputs are summed to generate an accurate linear DC voltage proportional to the input RF signal in m. The LT558 delivers superior temperature stable output (within ± over full temperature range) from 4MHz to.8ghz. The output is buffered with a low impedance driver., LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION 4MHz -.8GHz Logarithmic RF Detector Output Voltage and Linearity Error vs Input Power RF INPUT 56 nf nf EN LT558 ENBL IN + IN GND 9 OUT CAP + CAP V CC 558 TA pf V OUT.μF 5V AT 88 MHz LINEARITY ERROR ().5. T A = 4 C T A = 5 C INPUT POWER (m) 558 TA 558f

2 LT558 ABSOLUTE MAXIMUM RATINGS (Note ) Power Supply Voltage...5.5V Enable Voltage....V, V CC +.V RF Input Power...5m Operating Ambient Temperature... 4 C to +85 C Storage Temperature Range C to +5 C Maximum Junction Temperature... 5 C PIN CONFIGURATION ENBL IN + IN GND 4 TOP VIEW DD PACKAGE 8-LEAD (mm mm) PLASTIC DFN θ JA = 4 C/W EXPOSED PAD (PIN 9) SHOULD BE SOLDERED TO PCB OUT CAP + CAP V CC ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT558IDD#PBF LT558IDD#TRPBF LCVG 8-Lead (mm mm) Plastic DFN 4 C to 85 C 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 cations, go to: ELECTRICAL CHARACTERISTICS The denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T A = 5 C,, ENBL = 5V. (Note ) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS RF Input Input Frequency Range 4 to 8 MHz DC Common Mode Voltage V CC.5 V Input Resistance 94 Ω f RF = 4 MHZ RF Input Power Range to m Linear Dynamic Range ± Linearity Error (Note ) 76 Output Slope 9.9 mv/ Logarithmic Intercept (Note 5) 87.5 m Sensitivity 7 m Output Variation vs Temperature Normalized to Output at 5 C P IN = 5m; 4 C < T A < 85 C P IN = m; 4 C < T A < 85 C P IN = m; 4 C < T A < 85 C./.6./.6./.6 558f

3 ELECTRICAL CHARACTERISTICS The denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T A = 5 C,, ENBL = 5V. (Note ) LT558 SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS nd Order Harmonic Distortion Pin = m; At RF Input 6 c rd Order Harmonic Distortion Pin = m; At RF Input 6 c f RF = 45 MHz RF Input Power Range to m Linear Dynamic Range ± Linearity Error (Note ) 75 Output Slope 9.6 mv/ Logarithmic Intercept (Note 5) 87. m Sensitivity 7.5 m f RF = 88 MHz f RF = 4 MHz f RF = 7 MHz Output Variation vs Temperature Normalized to Output at 5 C P IN = 5m; 4 C < T A < 85 C P IN = m; 4 C < T A < 85 C P IN = m; 4 C < T A < 85 C./.6./.5./.5 nd Order Harmonic Distortion Pin = m; At RF Input 4 c rd Order Harmonic Distortion Pin = m; At RF Input 44 c RF Input Power Range to m Linear Dynamic Range ± Linearity Error (Note ) 75 Output Slope 9. mv/ Logarithmic Intercept (Note 5) 88.8 m Sensitivity 7.5 m Output Variation vs Temperature Normalized to Output at 5 C P IN = 5m; 4 C < T A < 85 C P IN = m; 4 C < T A < 85 C P IN = m; 4 C < T A < 85 C./.7./.4./.4 nd Order Harmonic Distortion Pin = m; At RF Input 7 c rd Order Harmonic Distortion Pin = m; At RF Input 4 c RF Input Power Range 7 to m Linear Dynamic Range ± Linearity Error (Note ) 7 Output Slope 7.7 mv/ Logarithmic Intercept (Note 5) 89. m Sensitivity 69. m Output Variation vs Temperature Normalized to Output at 5 C P IN = 5m; 4 C < T A < 85 C P IN = m; 4 C < T A < 85 C P IN = m; 4 C < T A < 85 C./.4.4/..7/.5 RF Input Power Range 7 to m Linear Dynamic Range ± Linearity Error (Note ) 65 Output Slope 7.6 mv/ Logarithmic Intercept (Note 5) 87.5 m 558f

4 LT558 ELECTRICAL CHARACTERISTICS The denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T A = 5 C,, ENBL = 5V. (Note ) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Sensitivity 69.5 m f RF = 6 MHz Output Interface Power Up/Down Power Supply Output Variation vs Temperature Normalized to Output at 5 C P IN = 5m; 4 C < T A < 85 C P IN = m; 4 C < T A < 85 C P IN = m; 4 C < T A < 85 C./..7/../.9 RF Input Power Range 65 to m Linear Dynamic Range ± Linearity Error (Note ) 57 Output Slope 8 mv/ Logarithmic Intercept (Note 5) 8.4 m Sensitivity 6 m Output Variation vs Temperature Normalized to Output at 5 C P IN = 45m; 4 C < T A < 85 C P IN = 5m; 4 C < T A < 85 C P IN = 5m; 4 C < T A < 85 C.6/..9/.6.4/. Output DC Voltage No RF Signal Present.5 V Output Impedance 5 Ω Source Current ma Sink Current μa Rise Time.5V to.6v, % to 9%, f RF = 88 MHz ns Fall Time.6V to.5v, % to 9%, f RF = 88 MHz 8 ns ENBL = High (On) V ENBL = Low (Off). V ENBL Input Current VENBL = 5V 5 μa Turn ON time ns Turn OFF Time μs Supply Voltage 5.5 V Supply Current 9 6 ma Shutdown Current ENBL = Low μa 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. Note : The linearity error is calculated by the difference between the incremental slope of the output and the average slope from 5m to m. The dynamic range is defi ned as the range over which the linearity error is within ±. Note 4: Sensitivity is defi ned as the minimum input power required for the linearity error within 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 V f

5 TYPICAL PERFORMANCE CHARACTERISTICS (Test Circuit shown in Figure 5) LT Supply Current vs Supply Voltage..7 Input Power at 4MHz V OUT Variation vs Input Power at 4MHz NORMALIZED AT 5 C SUPPLY CURRENT I CC (ma) T A = 4 C T A = 5 C SUPPLY VOLTAGE V CC (V) T A = 4 C T A = 5 C INPUT POWER (m) LINEARITY ERROR () V OUT VARIATION () T A = 4 C INPUT POWER (m) 558 G 558 G 558 G..7 Input Power at 45MHz V OUT Variation vs Input Power at 45MHz NORMALIZED AT 5 C..7 Input Power at 88MHz.4..8 LINEARITY ERROR () V OUT VARIATION ().4..8 LINEARITY ERROR ().5. T A = 4 C T A = 5 C INPUT POWER (m) T A = 4 C INPUT POWER (m).5. T A = 4 C T A = 5 C INPUT POWER (m) 558 G4 558 G5 558 G6 V OUT Variation vs Input Power at 88MHz NORMALIZED AT 5 C..7 Input Power at.4ghz V OUT Variation vs Input Power at.4ghz NORMALIZED AT 5 C V OUT VARIATION ().4..8 LINEARITY ERROR () V OUT VARIATION () T A = 4 C INPUT POWER (m).5. T A = 4 C T A = 5 C INPUT POWER (m) T A = 4 C INPUT POWER (m) 558 G7 558 G8 558 G9 558f 5

6 LT558 TYPICAL PERFORMANCE CHARACTERISTICS (Test Circuit shown in Figure 5).8.5 Input Power at.7ghz V OUT Variation vs Input Power at.7ghz NORMALIZED AT 5 C.8.5 Input Power at.6ghz..9.6 LINEARITY ERROR () V OUT VARIATION ()..9.6 LINEARITY ERROR (). 7 T A = 4 C T A = 5 C INPUT POWER (m) T A = 4 C INPUT POWER (m). T A = 4 C T A = 5 C INPUT POWER (m) 558 G 558 G 558 G V OUT VARIATION () V OUT Variation vs Input Power at.6ghz NORMALIZED AT 5 C T A = 4 C INPUT POWER (m) 558 G PERCENTAGE DISTRIBUTION (%) Slope Distribution vs Temperature at.4ghz SLOPE (mv/) T A = 4 C T A = 5 C G4 PERCENTAGE DISTRIBUTION (%) Logarithmic Intercept Distribution vs Temperature at.4ghz T A = 4 C T A = 5 C LOGARITHMIC INTERCEPT (m) 558 G5..7 V NORMALIZED AT 5V..7 V NORMALIZED AT 5V.8.5 V LINEARITY ERROR ().4..8 LINEARITY ERROR ()..9.6 LINEARITY ERROR ().5. V CC = V INPUT POWER (m).5. V CC = V INPUT POWER (m). V CC = V INPUT POWER (m) 558 G6 558 G7 558 G f

7 LT558 PIN FUNCTIONS ENBL (Pin ): Enable Pin. An applied voltage above V will activate the bias for the IC. For an applied voltage below.v, the circuits will be shut down (disabled) with a corresponding 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 μa for EN = V and μa for EN = 5V, respectively. Note that at no time should the ENBL pin voltage be allowed to exceed V CC by more than.v. IN + (Pin ): RF Input Pin. The pin is internally biased to V CC.5V and should be DC blocked externally. The input is connected via internal 94Ω resistor to the IN pin which should be connected to ground with an ac-decoupling capacitor. IN (Pin ): AC Ground Pin. The pin is internally biased to V CC.5V and coupled to ground via internal pf 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 decoupled using pf and.μf 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 amplifier. An external low-pass filtering can be formed by connecting a capacitor to Vcc from each pin for filtering a low frequency modulation signal. See the Applications Information section for detail. OUT (Pin 8): Detector DC Output Pin. BLOCK DIAGRAM DC OFFSET CANCELLATION 5 V CC IN + ENBL RF LIMITER RF LIMITER RF LIMITER RF LIMITER RF LIMITER IN RF DETECTOR CELLS 8 OUT GND CAP CAP BD 558f 7

8 LT558 APPLICATIONS INFORMATION The LT558 is a 4MHz to.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 filtered before applied to the output buffer amplifier. As a result, the final DC output voltage approximates the logarithm of the amplitude of the input signal. The LT558 is able to accurately measure an RF signal over a 7 dynamic range ( 68m to m at.ghz) with 5Ω single-ended input impedance. The slope of linear to log transfer function is about 7.7mV/ at.ghz. Within the linear dynamic range, very stable output is achieved over the full temperature range from 4 C to 85 C and over the full operating frequency range from 4MHz to.8ghz. The absolute variation over temperature is typically within ± over 65 dynamic range at.ghz. RF INPUT The simplified schematic of the input circuit is shown in Figure. The IN + and IN pins are internally biased to V CC.5V. The IN pin is internally coupled to ground via pf capacitor. An external capacitor of nf is needed to connect this pin to ground for low frequency operation. The impedance between IN + and IN is about 94Ω. The RF input pin IN + should be DC blocked when connected to ground or other matching components. A 56Ω resistor (R) connected to ground will provide better than input return loss over the operating frequency range up to.5ghz. At higher operating frequency, additional LC matching elements are needed for a proper impedance matching to a 5Ω source as shown in Figure. Refer to Figure 6 for the circuit schematic of the input matching network. The input impedance vs frequency of the RF input port IN + is detailed in Table. Table. RF Input Impedance FREQUENCY RF INPUT S (MHz) IMPEDANCE (Ω) MAG ANGLE( ) j j j j j j j j j j j j j j j j j j j j j V CC IN + IN 5.k 94 p 5.k 558 F + INPUT RETURN LOSS () W/O L AND C8 L =.5nH, C8 = pf C4, C = pf, C8 =.7pF FREQUENCY (GHz) 558 F 8 Figure. Simplifi ed Schematic of the Input Circuit Figure. Input Return Loss with Additional LC Matching Network 558f

9 APPLICATIONS INFORMATION OUTPUT INTERFACE The output interface of the LT558 is shown in Figure. This output buffer circuit can source ma current to the load and sink μa current from the load. The smallsignal output bandwidth is approximately 4MHz when the output is resistively terminated or open. The full-scaled % to 9% rise and fall times are ns and 8nS, respectively. The output transient responses at varied input power levels are shown in Figure 4. C9 C6 V CC CAP + CAP μa Figure. Simplifi ed Schematic of the Output Interface p + OUTPUT CURRENTS FROM RF DETECTORS LT558 RF PULSE OFF RF PULSE ON + AT 88MHZ RF PULSE OFF μa PIN = m PIN = m PIN = m PIN = m PIN = 4m PIN = 5m RF PULSE ENABLE (V) 558 F OUT LT558 When the part is enabled, the output impedance is about 5Ω. When it is disabled, the output impedance is about 9.5kΩ referenced to ground. EXTERNAL FILTERING AT CAP +, CAP The CAP + and CAP Pins are internally biased at V CC.6V via a Ω resistor from voltage supply V CC as shown in Figure. These two pins are connected to the differential outputs of the internal RF detector cells. In combination with the pf in parallel, a low-pass filter is formed with corner frequency of MHz. The high frequency rectified signals (particularly second-order harmonic of the RF signal) from the detector cells are filtered and then the DC output is amplified by the output buffer amplifier. In some applications, the LT558 may be used to measure a modulated RF signal with low frequency AM content (lower than MHz), a large modulation signal may be present at these two pins due to insufficient low-pass filtering, resulting in output voltage fl uctuation at the LT558 s output. Its DC content may also vary depending upon the modulation frequency. To assure stable DC output of the LT558, external capacitors C6 and C9 can be connected from CAP + and CAP to V CC to filter out this low frequency AM modulation signal. Assume the modulation frequency of the RF signal is f MOD, the capacitor value in Farads of C6 and C9 can be chosen by the following formula: C6 (or C9) /(π f MOD ) Do not connect these two filtering capacitors to ground or any other low voltage reference at any time to avoid an abnormal start-up condition TIME (μs) 558 F4 Figure 4. Simplifi ed Circuit Schematic of the Output Interface 558f 9

10 LT558 APPLICATIONS INFORMATION ENBL (ENABLE) PIN OPERATION A simplified circuit schematic of the ENBL Pin is shown in Figure 5. The enable voltage necessary to turn on the LT558 is V. The current drawn by the ENBL pin varies with the voltage applied at the pin. When the ENBL voltage is V, the ENBL current is typically μa. When the ENBL voltage is 5V, the ENBL current is increased to μa. To disable or turn off the chip, this voltage should be below.v. It is important that the voltage applied to the ENBL pin should never exceed V CC by more than.v. Otherwise, the supply current may be sourced through the upper ESD protection diode connected at the ENBL pin. Under no circumstances should voltage be applied to the ENBL Pin before the supply voltage is applied to the V CC pin. If this occurs, damage to the IC may result. V CC ENBL 4k 4k 558 F5 Figure 5. Simplifi ed Schematic of the Enable Circuit TEST CIRCUIT RF INPUT C8 pf ENABLE L.5nH R4 4.99k LT558 8 R5 C4 ENBL OUT 7 O IN + CAP + IN 6 nf R CAP C5 56Ω 4 5 GND V C9 nf CC OPT TC C pf C.μF C6 OPT C pf 5V C7 OPT V OUT Figure 6. Evaluation Board Circuit Schematic 4MHz to.7ghz REF DES VALUE SIZE PART NUMBER C.μF 6 AVX 6ZC4KAT C, C pf 4 AVX 4YCKAT C4, C5 nf 6 AVX 4ZCK C8 pf 4 AVX 4YAROCAT R 56 4 VISHAY, CRCW456ROFKED R4 4.99k 4 VISHAY, CRCW44K99FKED L.5nH 4 TOKO, LL5-FHIN5S.6GHz to.8ghz REF DES VALUE SIZE PART NUMBER C4, C pf 4 MURATA, GRM55CHJZB C8.7pF 4 MURATA, GJR55CHR7BB C5 OPEN NOTE: Replace L with C. 558f

11 TEST CIRCUIT LT TC Figure 7. Component Side of Evalution Board PACKAGE DESCRIPTION.675 ±.5 DD Package 8-Lead Plastic DFN (mm mm) (Reference LTC DWG # ) R =.5 TYP ±..5 ±.5.5 ±.5.65 ±.5 ( SIDES).5 ±.5.5 BSC.8 ±.5 ( SIDES) PACKAGE OUTLINE RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN TOP MARK (NOTE 6). REF. ±. (4 SIDES).75 ± ±. ( SIDES) 4.5 ±.5.8 ±. ( SIDES) BOTTOM VIEW EXPOSED PAD NOTE:. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M-9 VARIATION OF (WEED-). DRAWING NOT TO SCALE. 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.5mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN LOCATION ON TOP AND BOTTOM OF PACKAGE.5 BSC (DD8) DFN 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. 558f

12 LT558 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS Infrastructure LT554 Ultralow Distortion, IF Amplifi er/adc Driver with Digitally Controlled Gain 85MHz Bandwidth, 47 m OIP at MHz,.5 to Gain Control Range LT555.5GHz to.5ghz Direct Conversion Quadrature Demodulator m IIP, Integrated LO Quadrature Generator LT556.8GHz to.5ghz Direct Conversion Quadrature Demodulator.5m IIP, Integrated LO Quadrature Generator LT557 4MHz to 9MHz Quadrature Demodulator m IIP, Integrated LO Quadrature Generator LT558.5GHz to.4ghz High Linearity Direct Quadrature Modulator.8m OIP at GHz, 58.m/Hz Noise Floor, 5Ω Single-Ended RF and LO Ports, 4-Channel W-CDMA ACPR = 64c at.4ghz LT559.7GHz to.4ghz High Linearity Upconverting Mixer 7.m IIP at GHz, Integrated RF Output Transformer with 5Ω Matching, Single-Ended LO and RF Ports Operation LT55.GHz to.ghz High Linearity Upconverting Mixer 5.9m IIP at.9ghz, Integrated RF Output Transformer with 5Ω Matching, Single-Ended LO and RF Ports Operation LT55 MHz to 7MHz High Linearity Upconverting Mixer 4.m IIP at.95ghz, NF =.5,.5V to 5.5V Supply, Single- Ended LO Port Operation LT55 LT554 6 MHz to.7ghz High Signal Level Downconverting Mixer Low Power, Low Distortion ADC Driver with Digitally Programmable Gain 4.5V to 5.5V Supply, 5m IIP at 9MHz, NF =.5, 5Ω Single- Ended RF and LO Ports 45MHz Bandwidth, 4m OIP, 4.5 to 7 Gain Control LT555 High Linearity, Low Power Downconverting Mixer Single-Ended 5Ω RF and LO Ports, 7.6m IIP at 9MHz, I CC = 8mA LT556 High Linearity, Low Power Downconverting Mixer V to 5.V Supply, 6.5m IIP, khz to GHz RF, NF =, I CC = 8mA, 65m LO-RF Leakage LT557 4MHz to.7ghz High Signal Level Downconverting Mixer IIP =.5m and NF =.5m at 9MHz, 4.5V to 5.5V Supply, I CC = 78mA, Conversion Gain = LT558 LT5557.5GHz to.4ghz High Linearity Direct Quadrature Modulator 4MHz to.8ghz,.v High Signal Level Downconverting Mixer.8m OIP at GHz, 59.m/Hz Noise Floor, 5Ω,.5V DC Baseband Interface, 4-Channel W-CDMA ACPR = 66c at.4ghz IIP =.7m at 6MHz,.5m at 6MHz, I CC = 8mA at.v LT556 Ultra-Low Power Active Mixer ma Supply Current, m IIP, NF, Usable as Up- or Down-Converter. LT5568 7MHz to 5MHz High Linearity Direct Quadrature.9m OIP at 85MHz, 6.m/Hz Noise Floor, 5Ω,.5V DC Modulator Baseband Interface, -Ch CDMA ACPR = 7.4c at 85MHz LT557.5GHz to.5ghz High Linearity Direct Quadrature Modulator LT5575 8MHz to.7ghz High Linearity Direct Conversion I/Q Demodulator RF Power Detectors.6m OIP at GHz, 58.6m/Hz Noise Floor, High-Ohmic.5V DC Baseband Interface, 4-Ch W-CDMA ACPR = 67.7c at.4ghz 5Ω, Single-Ended RF and LO Inputs. 8m IIP at 9MHz,.m P,.4 I/Q Gain Mismatch,.4 I/Q Phase Mismatch LTC 555 RF Power Detectors with >4 Dynamic Range MHz to GHz, Temperature Compensated,.7V to 6V Supply LTC557 khz to MHz RF Power Detector khz to GHz, Temperature Compensated,.7 to 6V Supply LTC558 MHz to 7GHz RF Power Detector 44 Dynamic Range, Temperature Compensated, SC7 Package LTC559 MHz to GHz RF Power Detector 6 Dynamic Range, Low Power Consumption, SC7 Package LTC55 MHz to 7GHz Precision RF Power Detector Precision V OUT Offset Control, Shutdown, Adjustable Gain LTC55 MHz to 7GHz Precision RF Power Detector Precision V OUT Offset Control, Shutdown, Adjustable Offset LTC55 MHz to 7GHz Precision RF Power Detector Precision V OUT Offset Control, Adjustable Gain and Offset LT554 5MHz to GHz Log RF Power Detector with 6 Dynamic Range ± Output Variation over Temperature, 8ns Response Time, Log Linear Response LTC556 Precision 6Mhz to 7GHz RF Power Detector with Fast Comparator Output 5ns Response Time, Comparator Reference Input, Latch Enable Input, 6m to +m Input Range LT557 Wide Dynamic Range Log RF/IF Detector Low Frequency to GHz, 8 Log Linear Dynamic Range LT557.7GHz RMS Power Detector Fast Responding, up to 6 Dynamic Range, ±. Accuracy Over Temperature and Dynamic Range LT 48 PRINTED IN USA Linear Technology Corporation 6 McCarthy Blvd., Milpitas, CA (48) 4-9 FAX: (48) LINEAR TECHNOLOGY CORPORATION 8 558f