MAX2203EWT-T10 Ver la hoja de datos (PDF) - Maxim Integrated

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MAX2203EWT-T10

RMS Power Detector

Maxim Integrated 

RMS Power Detector

PA 1

COUPLER 1

10Ω

50Ω

PA 2

COUPLER 2

10Ω

50Ω

RMS

DETECT

BUFFER

DETECTOR

OUTPUT

ENABLE

BIAS

MAX2203

Figure 1. System Level Connection

Applications Information

The MAX2203 uses external termination when using

directional couplers. Figure 1 shows the system level

connection of dual-band power detection. The output of

the detector is typically connected to an ADC in

cdma2000 or WCDMA power-control topology.

Enable Logic Level

The MAX2203 features an enable input (ENA) that

allows the device to be put into shutdown. For normal

operation, drive ENA high. For device shutdown, drive

ENA low. The ENA pin is DC biased through a resistor.

The value of the resistor is recommended to be greater

than 1kΩ to avoid loading the RF input signal. There is

an internal resistor to GND of approximately 50kΩ. If

the control source high voltage is greater than 2.8V,

calculate and use a resistor value that ensures the ENA

pin only sees a maximum of 2.7V, which is within speci-

fication. In this manner, the MAX2203 can be driven

from a control device with a logic-high greater than

2.8V.

Layout

The MAX2203 is not particularly sensitive to the layout

since it only needs 3dBm for maximum output voltage.

However, there are two areas that need attention: the

GND pins and the supply bypassing. Connect the GND

pins to the PCB ground with a ground via as close as

possible, and bypass VCC to ground with a capacitor

as close as possible to the part.

Chip Information

PROCESS: BiCMOS

6 _______________________________________________________________________________________

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