5ppm/°C for both the voltage reference and the buffer combined, while operating at a typical quiescent current

of 820 µA. Figure 8-3 compares the output impedance of a regular voltage reference (REF20xx) and a voltage

reference with integrated ADC drive buffer (REF60xx). Figure 8-4 compares the burst-mode, reference-settling

performance of a regular voltage reference and the REF60xx.

Bandgap

Voltage

Reference

CFILT = 1 µF

CL = 47 µF

RESR = 5 PŸ

RFILT

Buffer

+

VIN

OUT_S

OUT_F

FILT

VIN

GND_S

GND_F

Power Supply

SS

REF60xx

RLIM = 120 NŸ

EN

GND

REF

+

VIN

R = 1 NŸ

RF = 5 Ÿ

CF = 10 nF

THS4521

AINP

AINN

ADS8881

Copyright © 2016, Texas Instruments Incorporated

R = 1 NŸ

R = 1 NŸ

R = 1 NŸ

RF = 5 Ÿ

Power Supply

Figure 8-2. REF60xx Driving REF Pin of ADS8881 SAR ADC

0.001

0.01

0.1

1

10

100

100

1k

10k

100k

1M

Frequency (Hz)

C063

REF20xx (C

L = 10 µF)

REF60xx (C

L = 10 µF)

Figure 8-3. Output Impedance Comparison

±4

±3

±2

±1

0

1

2

3

4

0

200

400

600

800

1000

Time (µs)

C042

Regular Voltage Reference Droop

REF60xx Droop

1LSB = 19.07µV, with ADS8881 at 1MSPS

Figure 8-4. Reference Droop Comparison

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REF60

SBOS708C – MAY 2016 – REVISED APRIL 2026

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