MAX2015 Ver la hoja de datos (PDF) - Maxim Integrated

Número de pieza

componentes Descripción

Fabricante

MAX2015

0.1GHz to 3GHz, 75dB Logarithmic Detector/Controller

Maxim Integrated 

0.1GHz to 3GHz, 75dB Logarithmic

Detector/Controller

VS

R4

1 VCC

C6

C5

DETECTORS

OUT 8

VOUT

C1

2 INHI

RFIN

20kΩ SET 7

VSET

C2

3 INLO

20kΩ

6

GND

4 VCC

MAX2015

5

PWDN

C4

C3

POWER AMPLIFIER

TRANSMITTER

SET-POINT

DAC

GAIN-CONTROL INPUT

COUPLER

LOGARITHMIC IN

OUT

DETECTOR

SET

20kΩ

20kΩ

MAX2015

Figure 2. Controller-Mode Typical Application Circuit

Figure 3. System Diagram for Automatic Gain-Control Loop

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 MAX2015 adjusts the power of the PA to a

level determined by the voltage applied to SET. With R1 =

0Ω, the controller mode slope is approximately

19mV/dB (RF = 100MHz).

Layout Considerations

As with any RF circuit, the layout of the MAX2015 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.

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