AMC7832IPAPRG4 datasheet(37/74 Pages) TI2

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ADC

12-b

Internal

Reference

(2.5V)

DAC-0

12-b

DAC-1

12-b

DAC-11

12-b

REF_CMP

C > 4.7 µF

(Minimize

inductance to pin)

REF_OUT1

REF_OUT2

LOCAL

TEMP

SENSOR

DAC RANGE

SETUP

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.

AGND2

AMC7832

www.ti.com

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

circuitry. The ADC reference buffer is powered down by default and should be enabled in the ADC Configuration

The REF_OUT1 and REF_OUT2 outputs can directly drive the VRANGEA,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.

Figure 51. AMC7832 Internal Reference

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