DAC7562SDGST datasheet(39/63 Pages) TI2

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REF _ MAX

REF _ MIN

REF

RANGE

Drift Error

ppm / C

OUT

GND

LDAC

CLR

SYNC

SCLK

REFIN

REFOUT

REFIN

REFOUT

OUT

GND

LDAC

CLR

150 nF

DGS

DSC

DAC7562, DAC7563, DAC8162

DAC8163, DAC8562, DAC8563

www.ti.com

SLAS719E – AUGUST 2010 – REVISED JUNE 2015

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

9.1.1 DAC Internal Reference

The internal reference of the DAC756x, DAC816x, and DAC856x devices does not require an external load

capacitor for stability because it is stable without any capacitive load. However, for improved noise performance,

an external load capacitor of 150 nF or larger connected to the VREFIN/VREFOUT output is recommended. Figure 94

shows the typical connections required for operation of the DAC756x, DAC816x, and DAC856x internal

reference. A supply bypass capacitor at the AVDD input is also recommended.

Figure 94. Typical Connections for Operating the DAC756x, DAC816x, and DAC856x Internal Reference

9.1.1.1 Supply Voltage

The internal reference features an extremely low dropout voltage. It can be operated with a supply of only 5 mV

above the reference output voltage in an unloaded condition. For loaded conditions, see the Load Regulation

section. The stability of the internal reference with variations in supply voltage (line regulation, dc PSRR) is also

exceptional. Within the specified supply voltage range of 2.7 V to 5.5 V, the variation at VREFIN/VREFOUT is

typically 50

μV/V; see Figure 7.

9.1.1.2 Temperature Drift

The internal reference is designed to exhibit minimal drift error, defined as the change in reference output voltage

over varying temperature. The drift is calculated using the box method described by Equation 3:

(3)

where:

VREF_MAX = maximum reference voltage observed within temperature range TRANGE.

VREF_MIN = minimum reference voltage observed within temperature range TRANGE.

VREF = 2.5 V, target value for reference output voltage.

TRANGE = the characterized range from –40°C to 125°C (165°C range)

The internal reference features an exceptional typical drift coefficient of 4 ppm/°C from –40°C to 125°C.

Characterizing a large number of units, a maximum drift coefficient of 10 ppm/°C is observed. Temperature drift

results are summarized in Figure 3.

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