AMC7834 datasheet(80/97 Pages) TI2

80 / 97 page

0.1 µF

DVDD

GND

LM50

ADC4

100 pF

PNP

NPN

D+

D±

D+

D±

Temperature diodes

on PA board

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.

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.

Figure 106. Temperature Sense Application With LM50

AMC7834 Datasheet(PDF) 80 Page - Texas Instruments