MAX2015ETA+

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1. Description

The MAX2015ETA+ complete multistage logarithmic amplifier is designed to accurately convert radio-frequency (RF) signal power in the 0.1GHz to 3GHz frequency range to an equivalent DC voltage. The outstanding dynamic range and precision over temperature of this log amplifier make it particularly useful for a variety of base station and other wireless applications, including automatic gain control (AGC), transmitter power measurements, and received signal strength indication (RSSI) for terminal devices. The MAX2015 can also be operated in a controller mode where it measures, compares, and controls the output power of a variable-gain amplifier as part of a fully integrated AGC loop. This logarithmic amplifier provides much wider measurement range and superior accuracy compared to controllers based on diode detectors, while achieving excellent temperature stability over the full -40°C to +85°C operating range.

2. Features

    1. Complete RF Detector/Controller

    2. 0.1GHz to 3GHz Frequency Range

    3. Exceptional Accuracy Over Temperature

    4. High Dynamic Range

    5. 2.7V to 5.25V Supply Voltage Range*

    6. Scaling Stable Over Supply and Temperature Variations

    7. Controller Mode with Error Output

    8. Shutdown Mode with Typically 1µA of Supply Current

    9. Available in 8-Pin µMAX® and TDFN Packages

3. Pin configuration

4. Detailed Description

The MAX2015ETA+ is a successive detection logarithmic amplifier designed for use in RF power measurement and AGC applications with a 0.1GHz to 3GHz frequency range from a single 2.7V to 3.6V power supply. It is pin compatible with other leading logarithmic amplifiers. The MAX2015 provides for improved performance with a high 75dB dynamic range at 100MHz, and exceptional accuracy over the extended temperature range and supply voltage range.

5. RF input

MAX2015 differential RF input (INHI, INLO) allowed Suitable for wideband signals between 100MHz and 3GHz. for Single-ended signal, AC coupled INLO to ground. this The RF input is internally biased and requires a 680pF capacitor for AC coupling. INHI and INLO provides a good 50MHz to 3.0GHz matching.

6. Set input

When in the controller, the SET input is used for loop control Mode or set the slope of the output signal (mV/dB) When in detector mode. Internal input structure SET is two 20kΩ resistors connected in series to ground. The center node of the resistor is fed to the negative The input of the internal output operational amplifier.

7. Power connection

MAX2015 requires power supply bypass capacitor Connect close to each VCC pin. On each VCC pin, Connect a 0.1pF capacitor (C4, C6) and a 100pF capacitor (C3, C5), where the 100pF capacitor is closest to pin. For supply voltages (VS) between 2.7V and 3.6V, Set R4 = 0Ω. For 4.75V and 5.25V, set R4 = 75Ω ±1% (100ppm/°C maximum) and PWDN Must be connected to GND.

8. Power down mode

MAX2015 can be powered down by driving PWDN Logic high (logic high = VCC). When power is off Mode, the power supply current is reduced to the typical value 1µA. For normal operation, use logic to drive PWDN low. It is recommended to use when power down No RF signal is applied before power off The signal is low.

9. Detector (RSSI) mode

In the detector mode, MAX2015 is like an RSSI, It provides an output voltage proportional to the output voltage input power. This is achieved by providing a feedback path from OUT to SET. By connecting SET directly to OUT, the operational amplifier gain is Due to two internal 20kΩ feedback resistors, it is set to 2V/V. This provides approximately the slope of the detector 18mV/dB, the output range is 0.5V to 1.8V.

10. Package overview