AMC7832_15 Datasheet, PDF (54/72 Pages) Texas Instruments – AMC7832 12-Bit Analog Monitor and Control Solution with Multi-Channel ADC, Bipolar DACs, Temperature Sensor and GPIO Ports

AMC7832
SLAS836 – MARCH 2014
www.ti.com
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
AMC7832
GPIO
MUX
ADC
Temperature
Sensor
DAC
RF IN
Power
Power
Amplifier
RF IN
Power
2I
R_shunt
Power
Amplifier
Temp
Sensor ^{Heat Sink}
Heat Sink
Temperature Sensing
Current Sensing
Figure 57. AMC7832 Example Control and Monitor System
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