REF5025 datasheet(28/49 Pages) TI

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9 Applications 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, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

Data acquisition systems often require stable voltage references to maintain accuracy. The REF50xx family

features low noise, very low drift, and high initial accuracy for high-performance data converters. Figure 9-1

shows the REF5040 in a basic data acquisition system.

9.2 Typical Applications

9.2.1 16-Bit, 250-KSPS Data Acquisition System

ADS8326

REF5040

OPA365

ESR

47µF

10µF

REFIN

CLK

SDO

1nF

0-4V

124Ÿ

Figure 9-1. Complete Data Acquisition System Using the REF50xx

9.2.1.1 Design Requirements

When using the REF50xx in the design, select a proper output capacitor that does not create gain peaking,

thereby increasing total system noise. At the same time, the capacitor must be selected to provide required

filtering performance for the system. In addition, input bypass capacitor and noise reduction capacitors must be

added for optimum performances. During the design of the data acquisition system, equal consideration must

be given to the buffering analog input signal as well as the reference voltage. Having a properly designed input

buffer with an associated RC filter is a necessary requirement for good performance of the data acquisition

system.

9.2.1.2 Detailed Design Procedure

The OPA365 is used to drive the 16-bit analog-to-digital converter (ADS8326). The RC filter at the output of the

OPA365 is used to reduce the charge kick-back created by the opening and closing of the sampling switch inside

the ADC. Design the RC filter such that the voltage at the sampling capacitor settles to 16-bit accuracy within the

acquisition time of the ADC. The bandwidth of the driving amplifier must at least be four times the bandwidth of

the RC filter.

REF5010, REF5020, REF5025, REF5030, REF5040, REF5045, REF5050

SBOS410M – JUNE 2007 – REVISED DECEMBER 2024

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