Controllers and RF Detector

Transcription

1 EVALUATION KIT AVAILABLE MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting General Description The MAX99 MAX99 low-cost, low-power logarithmic amplifiers are designed to control RF power amplifiers (PA) and transimpedance amplifiers (TIA), and to detect RF power levels. These devices are designed to operate in the MHz to.6ghz frequency range. A typical dynamic range of 5dB makes this family of logarithmic amplifiers useful in a variety of wireless and GPON fiber video applications such as transmitter power measurement, and RSSI for terminal devices. Logarithmic amplifiers provide much wider measurement range and superior accuracy to controllers based on diode detectors. Excellent temperature stability is achieved over the full operating range of - C to +85 C. The choice of three different input voltage ranges eliminates the need for external attenuators, thus simplifying PA control-loop design. The logarithmic amplifier is a voltage-measuring device with a typical signal range of -58dBV to -dbv for the MAX99/MAX99, -8dBV to -dbv for the MAX99, and -dbv to +dbv for the MAX99. The MAX99 MAX99 require an external coupling capacitor in series with the RF input port. These devices feature a power-on delay when coming out of shutdown, holding low for approximately.5μs to ensure glitch-free controller output. The MAX99 MAX99 family is available in an 8-pin μmax package. These devices consume 7mA with a 5V supply, and when powered down, the typical shutdown current is μa. Applications RSSI for Fiber Modules, GPON-CATV Triplexors Low-Frequency RF OOK and ASK Applications Transmitter Power Measurement and Control TSI for Wireless Terminal Devices Cellular Handsets (TDMA, CDMA, GPRS, GSM) Block Diagram appears at end of data sheet. Features Complete RF-Detecting PA Controllers (MAX99/MAX99/MAX99) Complete RF Detector (MAX99) Variety of Input Ranges MAX99/MAX99: -58dBV to -dbv (-5dBm to dbm for 5Ω Termination) MAX99: -8dBV to -dbv (-5dBm to +dbm for 5Ω Termination) MAX99: -dbv to +dbv (-dbm to +5dBm for 5Ω Termination) MHz to.6ghz Frequency Range Temperature Stable Linear-in-dB Response Fast Response: 7ns db Step ma Output Sourcing Capability Low Power: 7mW at V (typ) μa (typ) Shutdown Current Available in a Small 8-Pin μmax Package Ordering Information PART TEMP RANGE PIN-PACKAGE MAX99EUA+T - C to +85 C 8 µmax MAX99EUA+T - C to +85 C 8 µmax MAX99EUA+T - C to +85 C 8 µmax MAX99EUA+T - C to +85 C 8 µmax MAX99BGUA+T - C to +5 C 8 µmax +Denotes a lead(pb)-free/rohs-compliant package. T = Tape and reel. Pin Configurations TOP VIEW SET CLPF + MAX99 MAX99 MAX N.C. 5 GND + GND CLPF MAX99 MAX99B N.C. 5 GND μmax is a registered trademark of Maxim Integrated Products, Inc. µmax µmax 9-859; Rev ; /5

2 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Absolute Maximum Ratings (Voltages referenced to GND.)...-.V to +6V, SET,, CLPF... -.V to ( +.V) MAX99/MAX dBm MAX dBm MAX dBm Equivalent Voltage MAX99/MAX99...5V RMS MAX99...V RMS MAX99...V RMS Short Circuit to GND...Continuous Continuous Power Dissipation (T A = +7 C) 8-Pin μmax (derate.5mw/ C above +7 C)...6mW Operating Temperature Range... - C to +85 C Storage Temperature Range C to +5 C Lead Temperature (soldering, s)...+ C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC Electrical Characteristics ( = V, =.8V, T A = - C to +85 C, C CLPF = nf, unless otherwise noted. Typical values are at.) (Notes and 6) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V Supply Current I CC = 5.5V 7 ma Shutdown Supply Current I CC =.8V, = 5V µa Shutdown Output Voltage V =.8V mv Logic-High Threshold Voltage V H.8 V Logic-Low Threshold Voltage V L.8 V = V 5 Input Current I = V - -. MAIN PUT (MAX99/MAX99/MAX99) High, I SOURCE = ma Voltage Range V Low, I SINK = 5µA.5 Output-Referred Noise From CLPF 8 nv/ Hz Small-Signal Bandwidth BW From CLPF MHz Slew Rate V =.V to.6v from CLPF 8 V/µs SET INPUT (MAX99/MAX99/MAX99) Voltage Range (Note ) V SET Corresponding to central db span.5.5 V Input Resistance R IN MΩ Slew Rate (Note ) 6 V/µs DETECTOR PUT (MAX99/MAX99B) = dbm.5 Voltage Range V = -5dBm.6 Small-Signal Bandwidth BW C CLPF = 5pF.5 MHz Slew Rate V =.6V to.5v, C CLPF = 5pF 5 V/µs µa V V Maxim Integrated

3 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting AC Electrical Characteristics ( = V, =.8V, f RF = MHz to.6ghz, T A = - C to +85 C, C CLPF = nf, unless otherwise noted. Typical values are at.) (Notes and 6) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS RF Input Frequency Range f RF 6 MHz RF Input Voltage Range (Note ) Equivalent Power Range (5Ω Termination) (Note ) Logarithmic Slope Logarithmic Intercept RF INPUT INTERFACE V RF MAX MAX99/MAX99/MAX99B MAX P RF MAX MAX99/MAX99/MAX99B -5 V S P X MAX f RF = MHz, f RF = MHz 7 f RF = 9MHz, f RF = 9MHz f RF = 6MHz 7 f RF = MHz, f RF = MHz f RF = 9MHz, f RF = 9MHz f RF = 6MHz MAX99/MAX99/MAX99B MAX MAX MAX99/MAX99/MAX99B MAX MAX MAX99/MAX99/MAX99B MAX MAX MAX99/MAX99/MAX99B MAX MAX MAX99/MAX99/MAX99B -6 MAX99-5 MAX99-7 DC Resistance R DC Connected to kω Inband Capacitance C IB Internally DC-coupled (Note 5).5 pf Note : All devices are % production tested at and are guaranteed by design for T A = - C to +85 C as specified. Note : Typical value only, set-point input voltage range determined by logarithmic slope and logarithmic intercept. Note : Set-point slew rate is the rate at which the reference level voltage, applied to the inverting input of the g m stage, responds to a voltage step at the SET pin (see Figure ). Note : Typical min/max range for detector. Note 5: Pin capacitance to ground. Note 6: MAX99B is % production tested at and is guaranteed by design for T A = - C to +5 C as specified. dbv dbm mv/db dbm Maxim Integrated

4 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Typical Operating Characteristics ( = V, =,, all log conformance plots are normalized to their respective temperatures,, unless otherwise noted.) MAX99 SET vs. INPUT POWER 9MHz.6GHz MHz 5MHz MAX99 toc MAX99 LOG CONFORMANCE vs. INPUT POWER.6GHz MHz 9MHz 5MHz MAX99 toc MAX99 vs. INPUT POWER AT MHz MAX99 toc T A = - C MAX99 vs. INPUT POWER AT 5MHz MAX99 toc.8 MAX99 vs. INPUT POWER AT 9MHz MAX99 toc5.8 MAX99 vs. INPUT POWER AT.6GHz MAX99 toc T A = - C T A = - C T A = - C LOG SLOPE (mv/db) MAX99 LOG SLOPE vs. FREQUENCY T A = - C MAX99 toc7 LOG SLOPE (mv/db) MAX99 LOG SLOPE vs..6ghz 9MHz MHz 5MHz MAX99 toc8 LOG INTERCEPT (dbm) MAX99 LOG INTERCEPT vs. FREQUENCY T A = - C MAX99 toc Maxim Integrated

5 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Typical Operating Characteristics (continued) ( = V, =,, all log conformance plots are normalized to their respective temperatures,, unless otherwise noted.) LOG INTERCEPT (dbm) MAX99 LOG INTERCEPT vs. MHz 5MHz 9MHz.6GHz MAX99 toc MAX99 LOG CONFORMANCE vs. TEMPERATURE INPUT POWER = -dbm f RF = 5MHz MAX99 toc MAX99 SET vs. INPUT POWER 9MHz.6GHz 5MHz MHz MAX99 toc TEMPERATURE ( C) MAX99 LOG CONFORMANCE vs. INPUT POWER MHz 9MHz MAX99 toc.8.6. MAX99 vs. INPUT POWER AT MHz MAX99 toc.8.6. MAX99 vs. INPUT POWER AT 5MHz MAX99 toc GHz 5MHz T A = - C T A = - C MAX99 vs. INPUT POWER AT 9MHz MAX99 toc6 T A = - C MAX99 vs. INPUT POWER AT.6GHz MAX99 toc7 T A = - C LOG SLOPE (mv/db) MAX99 LOG SLOPE vs. FREQUENCY T A = - C MAX99 toc Maxim Integrated 5

6 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Typical Operating Characteristics (continued) ( = V, =,, all log conformance plots are normalized to their respective temperatures,, unless otherwise noted.) LOG SLOPE (mv/db) MAX99 LOG SLOPE vs..6ghz MHz 5MHz MAX99 toc9 LOG INTERCEPT (dbm) MAX99 LOG INTERCEPT vs. FREQUENCY T A = - C MAX99 toc LOG INTERCEPT (mv/db) MAX99 LOG INTERCEPT vs. 9MHz.6GHz MHz 5MHz MAX99 toc 9MHz MAX99 LOG CONFORMANCE vs. TEMPERATURE INPUT POWER = -dbm f RF = 5MHz MAX99 toc MHz MAX99 SET vs. INPUT POWER.6GHz MHz 5MHz MAX99 toc MAX99 LOG CONFORMANCE vs. INPUT POWER.6GHz 5MHz 9MHz MHz MAX99 toc TEMPERATURE ( C) MAX99 vs. INPUT POWER AT MHz MAX99 toc5.8.6 MAX99 vs. INPUT POWER AT 5MHz MAX99 toc6.8.6 MAX99 vs. INPUT POWER AT 9MHz MAX99 toc T A = - C T A = - C T A = - C Maxim Integrated 6

7 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Typical Operating Characteristics (continued) ( = V, =,, all log conformance plots are normalized to their respective temperatures,, unless otherwise noted.) MAX99 vs. INPUT POWER AT.6GHz MAX99 toc T A = - C LOG SLOPE (mv/db) MAX99 LOG SLOPE vs. FREQUENCY T A = - C MAX99 toc9 LOG SLOPE (mv/db) MAX99 LOG SLOPE vs..6ghz MHz 5MHz 9MHz MAX99 toc LOG INTERCEPT (dbm) MAX99 LOG INTERCEPT vs. FREQUENCY T A = - C MAX99 toc LOG INTERCEPT (dbm) MAX99 LOG INTERCEPT vs. 5MHz 9MHz.6GHz MHz MAX99 toc MAX99 LOG CONFORMANCE vs. TEMPERATURE INPUT POWER = -dbm f RF = 5MHz MAX99 toc TEMPERATURE ( C).8.6. MAX99 vs. INPUT POWER.6GHz MAX99 toc MAX99 LOG CONFORMANCE vs. INPUT POWER MHz 9MHz MAX99 toc MAX99B PUT AND LOG CONFORMANCE vs. INPUT POWER AT MHz toc6 (V) MHz 5MHz MHz GHz 5MHz (V) T A = +5 C T A = - C Maxim Integrated 7

8 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Typical Operating Characteristics (continued) ( = V, =,, all log conformance plots are normalized to their respective temperatures,, unless otherwise noted.).8 MAX99B PUT AND LOG CONFORMANCE vs. INPUT POWER AT 5MHz toc7.8 MAX99B PUT AND LOG CONFORMANCE vs. INPUT POWER AT 9MHz toc8.8 MAX99B PUT AND LOG CONFORMANCE vs. INPUT POWER AT.6GHz toc (V) LOG SLOPE (mv/db) T A = +5 C T A = - C MAX99B LOG SLOPE vs. FREQUENCY T A = +5 C T A = - C toc LOG SLOPE (mv/db) (V) T A = +5 C T A = - C MAX99 LOG SLOPE vs..6ghz MHz 5MHz 9MHz MAX99 toc (V) LOG INTERCEPT (mv/db) T A = +5 C T A = - C MAX99B LOG INTERCEPT vs. FREQUENCY T A = - C T A = +5 C toc LOG INTERCEPT (dbm) MAX99 LOG INTERCEPT vs. MHz 5MHz 9MHz.6GHz MAX99 toc MAX99B LOG CONFORMANCE vs. TEMPERATURE INPUT POWER = -dbm f RF = 5MHz TEMPERATURE ( C) toc SUPPLY CURRENT (ma) = 5.5V SUPPLY CURRENT vs. VOLTAGE (V) MAX99 toc5 Maxim Integrated 8

9 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Typical Operating Characteristics (continued) ( = V, =,, all log conformance plots are normalized to their respective temperatures,, unless otherwise noted.) SUPPLY CURRENT (ma) SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX99 toc6 5mV/div V/div POWER-ON DELAY RESPONSE TIME MAX99 toc7 C CLPF = 5pF V 6. V µs/div SUPPLY VOLTAGE (V) V/div 5mV/div RESPONSE TIME MAX99 toc8 CLPF = 5pF V V NOISE-SPECTRAL DENSITY (nv/hz) MAIN PUT NOISE-SPECTRAL DENSITY, MAX99 CLPF = pf MAX99 toc9 (V) MAXIMUM VOLTAGE vs. BY LOAD CURRENT ma 5mA ma MAX99 toc5 µs/div k k k M M FREQUENCY (Hz) LARGE-SIGNAL PULSE RESPONSE MAX99 toc5 SMALL-SIGNAL PULSE RESPONSE MAX99 toc5 C CLPF =,pf C CLPF = 5pF 5mV/div 9mV 75mV/div V f RF = 5MHz f RF = 5MHz 5mV/div 5mV/div -dbm -dbm -8dBm -dbm µs/div µs/div Maxim Integrated 9

10 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Pin Description PIN MAX99/ MAX99/ MAX99 MAX99 NAME FUNCTION RF Input Shutdown. Connect to for normal operation. SET Set-Point Input CLPF 5, 5 GND Ground Lowpass Filter Connection. Connect external capacitor between CLPF and GND to set control-loop bandwidth. 6 6 N.C. No Connection. Not internally connected. 7 7 PA Gain-Control Output 8 8 Supply Voltage. Bypass to GND with a.µf capacitor. PUT- ENABLED DELAY DET DET DET DET DET g m X CLPF db db db db V-I* SET GND OFFSET COMP REFERENCE CURRENT MAX99 MAX99 MAX99 PUT- ENABLED DELAY DET DET DET DET DET g m X CLPF db db db db V-I* OFFSET COMP REFERENCE CURRENT MAX99 GND Figure. Functional Diagram *INVERTING VOLTAGE TO CURRENT CONVERTER Maxim Integrated

11 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Detailed Description The MAX99 MAX99 family of logarithmic amplifiers (log amps) comprises four main amplifier/limiter stages each with a small-signal gain of db. The output stage of each amplifier is applied to a full-wave rectifier (detector). A detector stage also precedes the first gain stage. In total, five detectors, each separated by db, comprise the log amp strip. Figure shows the functional diagram of the log amps. A portion of the PA output power is coupled to of the logarithmic amplifier controller/detector, and is applied to the logarithmic amplifier strip. Each detector cell outputs a rectified current and all cell currents are summed and form a logarithmic output. The detected output is applied to a high-gain g m stage, which is buffered and then applied to. For the MAX99/MAX99/MAX99, is applied to the gain-control input of the PA to close the control loop. The voltage applied to SET determines the output power of the PA in the control loop. The voltage applied to SET relates to an input power level determined by the log amp detector characteristics. For the MAX99, is applied to an ADC typically found in a baseband IC which, in turn, controls the PA biasing with the output (Figure ). 5Ω XX 5Ω C CLPF C C GND CLPF N.C. GND Figure. MAX99 Typical Application Circuit PA MAX99 TRANSMITTER.µF DAC BASEBAND IC ADC Extrapolating a straight-line fit of the graph of SET vs. provides the logarithmic intercept. Logarithmic slope, the amount SET changes for each db change of RF input, is generally independent of waveform or termination impedance. The MAX99/MAX99/MAX99 slope at low frequencies is about 5mV/dB. Variance in temperature and supply voltage does not alter the slope significantly as shown in the Typical Operating Characteristics. The MAX99/MAX99/MAX99 are specifically designed for use in PA control applications. In a control loop, the output starts at approximately.9v (with supply voltage of V) for the minimum input signal and falls to a value close to ground at the maximum input. With a portion of the PA output power coupled to, apply a voltage to SET (for the MAX99/MAX99/MAX99) and connect to the gain-control pin of the PA to control its output power. An external capacitor from CLPF to ground sets the bandwidth of the PA control loop. Transfer Function Logarithmic slope and intercept determine the transfer function of the MAX99 MAX99 family of log amps. The change in SET voltage ( voltage for the MAX99) per db change in RF input defines the logarithmic slope. Therefore, a db change in RF input results in a 5mV change at SET ( for the MAX99). The Log Conformance vs. Input Power plots (see Typical Operating Characteristics) show the dynamic range of the log amp family. Dynamic range is the range for which the error remains within a band of ±db. The intercept is defined as the point where the linear response, when extrapolated, intersects the y-axis of the Log Conformance vs. Input Power plot. Using these parameters, the input power can be calculated at any SET voltage level ( voltage level for the MAX99) within the specified input range with the following equations: = (SET / SLOPE) + IP (MAX99/MAX99/MAX99) = ( / SLOPE) + IP (MAX99) where SET is the set-point voltage, is the output voltage for the MAX99, SLOPE is the logarithmic slope (V/dB), is in either dbm or dbv and IP is the logarithmic intercept point utilizing the same units as. Maxim Integrated

12 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Applications Information Controller Mode (MAX99/MAX99/MAX99) Figure provides a circuit example of the MAX99/ MAX99/MAX99 configured as a controller. The MAX99/MAX99/MAX99 require a.7v to 5.5V supply voltage. Place a.μf low-esr, surface-mount ceramic capacitor close to to decouple the supply. Electrically isolate the RF input from other pins (especially SET) to maximize performance at high frequencies (especially at the high-power levels of the MAX99). The MAX99/MAX99/MAX99 require external AC-coupling. Achieve 5Ω input matching by connecting a 5Ω resistor between the AC-coupling capacitor of and ground. The MAX99/MAX99/MAX99 logarithmic amplifiers function as both the detector and controller in powercontrol loops. Use a directional coupler to couple a portion of the PA s output power to the log amp s RF input. For applications requiring dual-mode operation and where there are two PAs and two directional couplers, passively combine the outputs of the directional couplers before applying to the log amp. Apply a set-point voltage to SET from a controlling source (usually a DAC)., which drives the automatic gain-control input of the PA, corrects any inequality between the RF input level and the corresponding set-point level. This is valid assuming the gain control of the variable gain element is positive, such that increasing voltage increases gain. The ANTENNA 5Ω XX C C DAC C CLPF MAX99 MAX99 MAX99 SET N.C. CLPF POWER AMPLIFIER GND Figure. Control Mode Application Circuit Block.µF RF INPUT voltage can range from 5mV to within 5mV of the positive supply rail while sourcing ma. Use a suitable load resistor between and GND for PA control inputs that source current. The Typical Operating Characteristics has the Maximum Out Voltage vs. By Load Current graph that shows the sourcing capabilities and output swing of. and Power-On The MAX99 MAX99 can be placed in shutdown by pulling to ground. Shutdown reduces supply current to typically μa. A graph of Response Time is included in the Typical Operating Characteristics. Connect and together for continuous on operation. Power Convention Expressing power in dbm, decibels above mw, is the most common convention in RF systems. Log amp input levels specified in terms of power are a result of the following common convention. Note that input power does not refer to power, but rather to input voltage relative to a 5Ω impedance. Use of dbv, decibels with respect to a V RMS sine wave, yields a less ambiguous result. The dbv convention has its own pit-falls in that log amp response is also dependent on waveform. A complex input, such as CDMA, does not have the exact same output response as the sinusoidal signal. The MAX99 MAX99 performance specifications are in both dbv and dbm, with equivalent dbm levels for a 5Ω environment. To convert dbv values into dbm in a 5Ω network, add db. For CATV applications, to convert dbv values to dbm in a 75Ω network, add.5db. Table shows the different input power ranges in different conventions for the MAX99 MAX99. Table. Power Ranges of the MAX99 MAX99 PART dbv INPUT POWER RANGE dbm IN A 5Ω NETWORK dbm IN A 75Ω NETWORK MAX99-58 to - -5 to to -.75 MAX99-8 to - -5 to to +8.5 MAX99 - to + - to to +.5 MAX99-58 to - -5 to to Maxim Integrated

13 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Filter Capacitor and Transient Response In general, for the MAX99/MAX99/MAX99, the choice of filter capacitor only partially determines the time-domain response of a PA control loop. However, some simple conventions can be applied to affect transient response. A large filter capacitor, C CLPF, dominates time-domain response, but the loop bandwidth remains a factor of the PA gain-control range. The bandwidth is maximized at power outputs near the center of the PA s range, and minimized at the low and high power levels, where the slope of the gain-control curve is lowest. A smaller valued C CLPF results in an increased loop bandwidth inversely proportional to the capacitor value. Inherent phase lag in the PA s control path, usually caused by parasitics at, ultimately results in the addition of complex poles in the AC loop equation. To avoid this secondary effect, experimentally determine the lowest usable C CLPF for the power amplifier of interest. This requires full consideration to the intricacies of the PA control function. The worst-case condition, where the PA output is smallest (gain function is steepest) should be used because the PA control function is typically nonlinear. An additional zero can be added to improve loop dynamics by placing a resistor in series with C CLPF. See Figure for the gain and phase response for different C CLPF values. Additional Input Coupling There are three common methods for input coupling: broadband resistive, narrowband reactive, and series attenuation. A broadband resistive match is implemented by connecting a resistor to ground at the external AC-coupling capacitor at as shown in Figure 5. A 5Ω resistor (use other values for different input impedances) in this configuration, in parallel with the input impedance of the MAX99 MAX99, presents an input impedance of approximately 5Ω. These devices require an additional external coupling capacitor in series with the RF input. As the operating frequency increases over GHz, input impedance is reduced, resulting in the need for a larger-valued shunt resistor. Use a Smith Chart for calculating the ideal shunt resistor value. Refer to the MAX/MAX/MAX data sheet for narrowband reactive and series attenuation input coupling. 5 SOURCE 5Ω R S 5Ω Figure 5. Broadband Resistive Matching C C MAX99 MAX99 MAX99 MAX99 C IN R IN GAIN (db) GAIN AND PHASE vs. FREQUENCY MAX99 fig GAIN C CLPF = pf C CLPF = pf C CLPF = pf -8 PHASE k k k M M M FREQUENCY (Hz) C CLPF = pf PHASE (DEGREES) SMALL-SIGNAL BANDWIDTH vs. C CLPF..,, C CLPF (pf) MAX99 fig Figure. Gain and Phase vs. Frequency Maxim Integrated

14 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Waveform Considerations The MAX99 MAX99 family of logarithmic amplifiers respond to voltage, not power, even though input levels are specified in dbm. It is important to realize that input signals with identical RMS power but unique waveforms result in different log amp outputs. Differing signal waveforms result in either an upward or downward shift in the logarithmic intercept. However, the logarithmic slope remains the same; it is possible to compensate for known waveform shapes by baseband process. It must also be noted that the output waveform is generated by first rectifying and then averaging the input signal. This method should not be confused with RMS or peakdetection methods. Layout Considerations As with any RF circuit, the layout of the MAX99 MAX99 circuits affects performance. Use a short 5Ω line at the input with multiple ground vias along the length of the line. The input capacitor and resistor should both be placed as close as possible to the IC. should be bypassed as close as possible to the IC with multiple vias connecting the capacitor to the ground plane. It is recommended that good RF components be chosen for the desired operating frequency range. Electrically isolate RF input from other pins (especially SET) to maximize performance at high frequencies (especially at the high power levels of the MAX99). Chip Information PROCESS: High-Frequency Bipolar Block Diagram SET GND GND LOG DETECTOR MAX99 MAX99 MAX99 LOG DETECTOR MAX99 V-I* g m BLOCK g m BLOCK PUT- ENABLE DELAY PUT- ENABLE DELAY V-I* *INVERTING VOLTAGE TO CURRENT CONVERTER. x BUFFER x BUFFER C CLPF C CLPF Maxim Integrated

15 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Package Information For the latest package outline information and land patterns (footprints), go to Note that a +, #, or - in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE LINE NO. LAND PATTERN NO. 8 μmax U Maxim Integrated 5

16 MAX99 MAX99 MHz to.6ghz 5dB RF-Detecting Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 8/7 Initial release /9 Added TOC6 to Typical Operating Characteristics 9 /5 Added information for the MAX99B. Revised Typical Operating Characteristics., 7, 8, 5 For pricing, delivery, and ordering information, please contact Maxim Direct at , or visit Maxim Integrated s website at Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. 5 Maxim Integrated Products, Inc. 6

17 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX99EUA+ MAX99EUA+T MAX99EUA+ MAX99EUA+T MAX99EUA+ MAX99EUA+T MAX99EUA+T MAX99EUA+