DAC7568 datasheet(49/65 Pages) TI

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HYST

´ 10 (ppm/ C)

REF_PRE

REF_POST

REF_NOM

OutputPin

Meter

Load

ForceLine

SenseLine

Contactand

TraceResistance

OUT

DAC7568

DAC8168

DAC8568

www.ti.com

SBAS430D – JANUARY 2009 – REVISED MAY 2012

Load Regulation

Thermal Hysteresis

Load regulation is defined as the change in reference

Thermal hysteresis for a reference is defined as the

output voltage as a result of changes in load current.

change in output voltage after operating the device at

The load regulation of the internal reference is

+25°C, cycling the device through the operating

measured using force and sense contacts as shown

temperature

range,

and

returning

+25°C.

in Figure 126. The force and sense lines reduce the

Hysteresis is expressed by Equation 3:

impact of contact and trace resistance, resulting in

accurate

measurement

the

load

regulation

contributed

solely

the

internal

reference.

Measurement results are summarized in the Typical

(3)

Characteristics. Force and sense lines should be

Where:

used for applications that require improved load

VHYST = thermal hysteresis.

regulation.

VREF_PRE = output voltage measured at +25°C

pre-temperature cycling.

VREF_POST = output voltage measured after the

device cycles through the temperature range of

–40°C to +125°C, and returns to +25°C.

DAC NOISE PERFORMANCE

Typical

noise

performance

for

the

DAC7568,

DAC8168, and DAC8568 with the internal reference

enabled is shown in Figure 66 to Figure 67. Output

noise spectral density at the VOUT pin versus

frequency is depicted in Figure 66 for full-scale,

Figure 126. Accurate Load Regulation of the

midscale, and zero-scale input codes. The typical

DAC7568/DAC8168/DAC8568 Internal Reference

noise density for midscale code is 120nV/

√Hz at

1kHz and 100nV/

√Hz at 1MHz. High-frequency noise

can be improved by filtering the reference noise.

Long-Term Stability

Integrated output noise between 0.1Hz and 10Hz is

Long-term stability/aging refers to the change of the

close to 6

μVPP (midscale), as shown in Figure 67.

output voltage of a reference over a period of months

or years. This effect lessens as time progresses (see

Figure 7, the typical long-term stability curve). The

typical drift value for the internal reference is 50ppm

from 0 hours to 1900 hours. This parameter is

characterized by powering-up 20 units and measuring

them at regular intervals for a period of 1900 hours.

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DAC7568 Datasheet(PDF) 49 Page - Texas Instruments

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