AMC7832 Datasheet, PDF (37/70 Pages) Texas Instruments – AMC7832 12-Bit Analog Monitor and Control Solution with Multi-Channel ADC, Bipolar DACs, Temperature Sensor and GPIO Ports

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AMC7832
SLAS836 – MARCH 2014
8.3.4 Internal Reference
The AMC7832 includes a high performance internal reference for the on-chip ADC and twelve DACs. The
internal reference is a 2.5-V bipolar transistor-based, precision bandgap reference. A compensation capacitor
(4.7-μF, typical) should be connected between the REF_CMP terminal and AGND2.
The AMC7832 includes two buffers to access the internal reference voltage through terminals REF_OUT1 and
REF_OUT2. If unused, the two reference buffers can be powered down independently in the Power-down 1
register (address 0xB3). A third buffer is used to drive the ADC and should not be used to drive any external
circuitry. The ADC reference buffer is powered down by default and should be enabled in the ADC Configuration
Register (address 0x10) during device initialization.
The REF_OUT1 and REF_OUT2 outputs can directly drive the VRANGE_A,B,C,D inputs thus enabling adjustment
of the DAC output ranges without the need for external circuitry. The internal reference buffers are not intended
to drive external loads. If driving an external load, a high impedance buffer amplifier is required.
C > 4.7 µF
(Minimize
inductance to pin)
REF_CMP
AGND2
LOCAL
TEMP
SENSOR
Internal
Reference
(2.5V)
ADC
12-b
REF_OUT1
REF_OUT2
DAC RANGE
SETUP
DAC-0
12-b
VRANGEA
VRANGEB
VRANGEC
VRANGED
* Each VRANGEn pin should be connected to either
GND or one of the REF_OUT pins according to the
desired output range for DAC group n.
DAC-1
12-b
DAC-11
12-b
Figure 51. AMC7832 Internal Reference
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