AMC7834 Datasheet, PDF (80/93 Pages) Texas Instruments – AMC7834 12-Bit Integrated Power-Amplifier Monitor and Control System with Temperature, Current and Voltage Supervision Capabilities

AMC7834
SLAS972B – NOVEMBER 2014 – REVISED MARCH 2016
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8.2.2.3 Temperature Sensing Applications
The AMC7834 has one local temperature and two temperature diode drivers, as well as four external analog
inputs that are easily configurable to remote temperature sensor circuits. The integrated temperature sensor,
remote temperature sensor, and analog input registers automatically update with every conversion. Figure 105
shows a typical setup for the two temperature diode-driver inputs. Additional noise filtering can be achieved by
placing a bypass capacitor across the inputs of the remote temperature sensors. A high-quality ceramic
capacitor, type NP0 or X7R, is recommended because of the optimal performance of the capacitor across
temperature. See the Remote Temperature Sensors section for a details.
D+
100 pF
D±
D+
100 pF
D±
PNP
Temperature diodes
on PA board
NPN
Figure 105. Remote Temperature Sensors (PNP and NPN)
Additionally, the ADC inputs can be used to accept voltage from other temperature-sensing IC circuits as shown
in Figure 106. The temperature sensor use for analog input conditioning in this example is the LM50 device
which is a high precision integrated-circuit temperature sensor that can sense a –40°C to +125°C temperature
range using a single positive supply. The full-scale output of the temperature sensor ranges from 100 mV to 1.75
V for a –40°C to +125°C temperature range. In an extremely noisy environment, adding some filtering to
minimize noise pickup may be necessary. A typical recommended value for the bypass capacitor is 0.1 µF from
the V+ pin to ground. A high-quality ceramic capacitor, type NP0 or X7R, is recommended because of the
optimal performance of the capacitor across temperature and very-low dissipation factor.
DV_DD
4
LM50
V⁺
VO
3
1
NC
ADC4
0.1 µF
GND
25
Figure 106. Temperature Sense Application With LM50
80
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