AMC7834 Datasheet, PDF (44/93 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
www.ti.com
7.3.7 Reference Specifications
The AMC7834 device includes a high-performance 2.5 V reference. Operation from an external reference is also
supported.
7.3.7.1 Internal Reference Operation
The AMC7834 device includes a 2.5 V bipolar transistor-based, precision bandgap reference. The internal
reference is externally available at the REF_OUT pin and can be used to drive the ADC and eight DACs by
connecting the REF_OUT pin to the REF_IN pin (see Figure 60). A 10-nF capacitor is recommended between
REF_OUT and AGND for noise filtering. An external buffer amplifier with a high-impedance input must be used to
drive any external load. A compensation capacitor (4.7 μF, typical) should be connected between the REF_CMP
pin and the AGND4 pin.
Internal
Reference
(2.5 V)
REF_OUT
10 nF
(Minimize
inductance to pin)
REF_IN
C > 4.7 µF
(Minimize
inductance to pin)
REF_CMP
ADC1
ADC2
ADC4
ADC
12-b
DAC Reference
DAC1
12-b
DAC2
12-b
AUXDAC4
12-b
Figure 60. Internal Reference Operation
44
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