±4

±3

±2

±1

0

1

2

3

4

0

200

400

600

800

1000

Time (µs)

C04

Regular Voltage Reference Droop

REF62xx Droop

0.001

0.01

0.1

1

10

100

100

1 k

10 k

100 k

1 M

Frequency (Hz)

C063

REF20xx (C

REF62xx (C

Bandgap

Voltage

Reference

PŸ

Buffer

+

VIN

OUT_S

OUT_F

FILT

VIN

GND_S

GND_F

Power Supply

SS

REF62xx

NŸ

EN

GND

REF

+

R = 1

NŸ

Ÿ

THS4521

AINP

AINN

ADS8881

Copyright © 2016, Texas Instruments Incorporated

R = 1

NŸ

R = 1

NŸ

R = 1

NŸ

Ÿ

Power Supply

21

REF6225, REF6230, REF6233, REF6241, REF6245, REF6250

www.ti.com

SBOS748 – SEPTEMBER 2016

Product Folder Links: REF6225 REF6230 REF6233 REF6241 REF6245 REF6250

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Copyright © 2016, Texas Instruments Incorporated

Feature Description (continued)

ppm/°C between 0°C and 70 °C for both the voltage reference and the buffer combined, while operating at a

typical quiescent current of 820 µA. The reference drift is guaranteed from 0°C and 70 °C. The REF62xx can

operate from -55°C to 125°C without getting damaged.Figure 50 compares the output impedance of a regular

voltage reference (REF20xx) and a voltage reference with integrated ADC drive buffer (REF62xx). Figure 51

compares the burst-mode, reference-settling performance of a regular voltage reference and the REF62xx.

Figure 49. REF62xx Driving REF Pin of ADS8881 SAR ADC

Figure 50. Output Impedance Comparison

1 LSB = 19.07 µV, with ADS8881 at 1 MSPS

Figure 51. Reference Droop Comparison