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MAX2014 Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX2014 Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 10 page 50MHz to 1000MHz, 75dB Logarithmic Detector/Controller _______________________________________________________________________________________ 9 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 variable-gain PA. As shown in the figure, the MAX2014 monitors the output of the PA through a directional cou- pler. An internal integrator (Figure 2) compares the detected signal with a reference voltage determined by VSET. The integrator, acting like a comparator, increas- es or decreases the voltage at OUT, according to how closely the detected signal level matches the VSET ref- erence. The MAX2014 adjusts the power of the PA to a level determined by the voltage applied to SET. With R1 = 0 Ω, the controller mode slope is approximately 19mV/dB (RF = 100MHz). Layout Considerations As with any RF circuit, the layout of the MAX2014 circuit affects the device’s performance. Use an abundant num- ber of ground vias to minimize RF coupling. Place the input capacitors (C1, C2) and the bypass capacitors (C3–C6) as close to the IC as possible. Connect the bypass capacitors to the ground plane with multiple vias. MAX2014 C6 R4 C1 C5 1 2 OUT SET VS C4 C3 4 VCC VCC INLO VOUT VSET 20k Ω 20k Ω INHI 7 8 RFIN C2 3 DETECTORS GND 6 PWDN 5 Figure 2. Controller-Mode Typical Application Circuit MAX2014 OUT SET 20k Ω 20k Ω IN COUPLER LOGARITHMIC DETECTOR TRANSMITTER POWER AMPLIFIER GAIN-CONTROL INPUT SET-POINT DAC Figure 3. System Diagram for Automatic Gain-Control Loop 13 4 86 5 MAX2014 2 7 TDFN TOP VIEW OUT SET GND PWDN VCC INHI INLO VCC Pin Configuration Chip Information PROCESS: BiCMOS |
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