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MAX2014ETA+ Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX2014ETA+ Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 12 page 50MHz to 1000MHz, 75dB Logarithmic Detector/Controller 9 Detailed Description The MAX2014 is a successive detection logarithmic amplifier designed for use in RF power measurement and AGC applications with a 50MHz to 1000MHz frequency range from a single 2.7V to 3.6V power supply. It is pin compatible with other leading logarith- mic amplifiers. The MAX2014 provides for improved performance with a high 75dB dynamic range at 100MHz, and exception- al accuracy over the extended temperature range and supply voltage range. RF Input The MAX2014 differential RF input (INHI, INLO) allows for broadband signals between 50MHz and 1000MHz. For single-ended signals, AC-couple INLO to ground. The RF inputs are internally biased and need to be AC- coupled using 680pF capacitors as shown in Figures 1 and 2. An internal 50 Ω resistor between INHI and INLO provides a good 50MHz to 1000MHz match. SET Input The SET input is used for loop control when in controller mode or to set the slope of the output signal (mV/dB) when in detector mode. The internal input structure of SET is two series 20kΩ resistors connected to ground. The center node of the resistors is fed to the negative input of the internal output op amp. Power-Supply Connections The MAX2014 requires power-supply bypass capacitors connected close to each VCC pin. At each VCC pin, connect a 0.1µF capacitor (C4, C6) and a 100pF capac- itor (C3, C5), with the 100pF capacitor being closest to the pin. For power-supply voltages (VS) between 2.7V and 3.6V, set R4 = 0Ω (see the typical application circuits, Figures 1 and 2 ). For power-supply voltages (VS) between 4.75V and 5.25V, set R4 = 75Ω ±1% (100ppm/°C max) and PWDN must be connected to GND. Power-Down Mode The MAX2014 can be powered down by driving PWDN with logic-high (logic-high = VCC). In power-down mode, the supply current is reduced to a typical value of 1µA. For normal operation, drive PWDN with a logic- low. It is recommended when using power-down that an RF signal not be applied before the power-down signal is low. Applications Information Detector (RSSI) Mode In detector mode, the MAX2014 acts like an RSSI, which provides an output voltage proportional to the input power. This is accomplished by providing a feed- back path from OUT to SET (R1 = 0Ω; see Figure 1). By connecting SET directly to OUT, the op amp gain is set to 2V/V due to two internal 20kΩ feedback resistors. This provides a detector slope of approximately 18mV/dB with a 0.5V to 1.8V output range. Controller Mode The MAX2014 can also be used as a detector/controller within an AGC loop. Figure 3 depicts one scenario where the MAX2014 is employed as the controller for a MAX2014 C6 C1 C5 1 2 OUT SET C4 C3 4 VCC VCC INLO OUT 20k Ω 20k Ω INHI 7 8 RFIN C2 3 DETECTORS R1 GND 6 PWDN 5 R4 VS Figure 1. Detector-Mode (RSSI) Typical Application Circuit Table 1. Suggested Components of Typical Application Circuits DESIGNATION VALUE TYPE C1, C2 680pF 0603 ceramic capacitors C3, C5 100pF 0603 ceramic capacitors C4, C6 0.1µF 0603 ceramic capacitors R1* 0 Ω 0603 resistor R4** 0 Ω 0603 resistor * RSSI mode only. ** VS = 2.7V to 3.6V. |
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