AMC7832IPAP datasheet(54/74 Pages) TI2

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MUX

ADC

GPIO

Temperature

Sensor

DAC

Heat Sink

Temp

Sensor

Power

Amplifier

Power

Amplifier

RF IN

AMC7832

Heat Sink

Temperature Sensing

Current Sensing

Rshunt

AMC7832

SLAS836 – MARCH 2014

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9 Applications and Implementation

9.1 Application Information

The AMC7832 device is a highly integrated, low-power, complete analog monitoring and control solution.

Although the device can be used in many different systems -- Industrial Control, Test and Measurement, and

Optical Communications -- the device is largely used in multi-channel RF communication driven applications

which incorporate power amplifiers.

Power amplifiers (PAs) include transistor technologies that are extremely temperature sensitive, and require DC

biasing circuits to optimize RF performance, power efficiency, and stability. The AMC7832 device provides 12

DAC channels, which can be used to bias the inputs of the power amplifiers. The device also includes an internal

local temperature sensor, and 17 ADC channels for general-purpose monitoring.

There are mainly two different types of monitoring schemes: current sensing, and temperature sensing. In the

current-sense application the PA drain current is monitored by measuring the shunt resistor’s differential voltage

drop. The devices internal local temperature sensor and analog inputs – which can be configured for remote

temperature ICs or thermistors – can be used to detect temperature variations during PA operation. Figure 57

shows the block diagrams to these different systems.

9.2 Typical Application

Figure 57. AMC7832 Example Control and Monitor System

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