DAC101C081_16 Datasheet, PDF(15/40 Page) Texas Instruments – DAC101C08xx 10-Bit Micro Power Digital-to-Analog Converter With an I2C-Compatible Interface

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DAC101C081_16 Datasheet, PDF (15/40 Pages) Texas Instruments – DAC101C08xx 10-Bit Micro Power Digital-to-Analog Converter With an I2C-Compatible Interface

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Feature Description (continued)

VREF

DAC101C081, DAC101C081Q, DAC101C085

SNVS801B â APRIL 2012 â REVISED JANUARY 2016

To Output Amplifier

Figure 20. DAC Resistor String

9.3.2 Output Amplifier

The output amplifier is rail-to-rail, providing an output voltage range of 0 V to VA when the reference is VA. All

amplifiers, even rail-to-rail types, exhibit a loss of linearity as the output approaches the supply rails (0 V and VA,

in this case). For this reason, linearity is specified over less than the full output range of the DAC. However, if the

reference is less than VA, there is only a loss in linearity in the lowest codes. The output capabilities of the

amplifier are described in the Electrical Characteristics table.

The output amplifiers are capable of driving a load of 2-kâ¦ in parallel with 1500 pF to ground or to VA. The zero-

code and full-scale outputs for given load currents are available in the Electrical Characteristics table.

9.3.3 Reference Voltage

The DAC101C081 uses the supply (VA) as the reference. With that said, VA must be treated as a reference. The

Analog output will only be as clean as the reference (VA). It is recommended that the reference be driven by a

voltage source with low output impedance.

The DAC101C085 comes with an external reference supply pin (VREF). For the DAC101C085, it is important that

VREF be kept as clean as possible.

The Applications Information section describes a handful of ways to drive the reference appropriately. Refer to

Using References as Power Supplies for details.

9.3.4 Power-On Reset

The power-on reset circuit controls the output voltage of the DAC during power-up. Upon application of power,

the DAC register is filled with zeros and the output voltage is 0 Volts. The output remains at 0 V until a valid write

sequence is made to the DAC.

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