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MAX2016ETI Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX2016ETI Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 19 page LF-to-2.5GHz Dual Logarithmic Detector/ Controller for Power, Gain, and VSWR Measurements ______________________________________________________________________________________ 11 The differential RF inputs allow for the measurement of broadband signals ranging from low frequency to 2.5GHz. For single-ended signals, RFINA- and RFINB- are AC-coupled to ground. The RF inputs are internally biased and need to be AC-coupled. Using 680pF capacitors, as shown in the Typical Application Circuit, results in a 10MHz highpass corner frequency. An internal 50 Ω resistor between RFINA+ and RFINA- (as well as RFINB+ and RFINB-) produces a good low-fre- quency to 3.0GHz match. SETA, SETB, and SETD Inputs The SET_ inputs are used for loop control when the device is in controller mode. Likewise, these same SET_ inputs are used to set the slope of the output sig- nal (mV/dB) when the MAX2016 is in detector mode. The center node of the internal resistor-divider is fed to the negative input of the power detector’s internal out- put op amp. Reference The MAX2016 has an on-chip 2V voltage reference. The internal reference output is connected to REF. The output can be used as a reference voltage source for the comparators or other components and can source up to 2mA. OUTA and OUTB Each OUT_ is a DC voltage proportional to the RF input power level. The change of OUT_ with respect to the power input is approximately 18mV/dB (R1 = R2 = 0 Ω). The input power level can be determined by the follow- ing equation: where PINT is the extrapolated intercept point of where the output voltage intersects the horizontal axis. OUTD OUTD is a DC voltage proportional to the difference of the input RF power levels. The change of the OUTD with respect to the power difference is 25mV/dB (R3 = 0 Ω). The difference of the input power levels (gain) can be determined by the following equation: where VCENTER is the output voltage, typically 1V, when PRFINA = PRFINB. Applications Information Monitoring VSWR and Return Loss The MAX2016 can be used to measure the VSWR of an RF signal, which is useful for detecting the presence or absence of a properly loaded termination, such as an antenna (see Figure 1). The transmitted wave from the power amplifier is coupled to RFINA and to the anten- na. The reflected wave from the antenna is connected to RFINB through a circulator. When the antenna is missing or damaged, a mismatch in the nominal load impedance results, leading to an increase in reflected power and subsequent change in the transmission line’s VSWR. This increase in reflected power is mani- fested by a reduction in the voltage at OUTD. An alarm condition can be set by using the low comparator out- put (COUTL) as shown in Figure 1. The comparator automatically senses the change in VSWR, yielding a logic 0 as it compares OUTD to a low DC voltage at CSETL. CSETL, in turn, is set by using the internal refer- ence voltage and an external resistor-divider network. Figure 1 illustrates a simple level detector. For window- detector implementation, see the Comparator/Window Detector section. PP VV SLOPE RFINA RFINB OUTD CENTER − = − () P V SLOPE P RFIN OUT INT _ _ =+ DESIGNATION VALUE DESCRIPTION C1, C2, C8, C9 680pF Microwave capacitors (0402) C3, C6, C10, C13 33pF Microwave capacitors (0402) C4, C7, C11, C14 0.1µF Microwave capacitors (0603) C5, C12, C15 Not used Capacitors are optional for frequency compensation C18 10µF Tantalum capacitor (C case) R1, R2, R3 0 Ω Resistors (0402) 0 Ω Resistor (1206) for VS = 2.7V to 3.6V R6 37.4 Ω ±1% resistor (1206) for VS = 4.75V to 5.25V Table 1. Component Values Used in the Typical Application Circuit |
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