Figure 7-2. Long-Term Stability TSOT -2000 Hours (VREF)

7.3 Noise Performance

7.3.1 1/f Noise

1/f noise, also known as flicker noise, is dominant mostly in the lower frequency bands. REF53-Q1 datasheet

specifies flicker noise for from 0.1Hz to 10Hz frequency band where 1/f noise has maximum power. Since the 1/f

noise is an extremely low value, the frequency of interest is amplified and filtered through a precise band filter

with very low-noise floor as Figure 7-3 shows.

REF

GND

VREF

VIN

EN

VIN

CREF

CIN

VREF

High-pass Filter

FC = 0.07 Hz

Low Noise

Preamplifier

G = 1000

2

nd Order

Low-pass Filter

FC = 10 Hz

G = 1

2

nd Order

Low-pass Filter

FC = 10 Hz

G = 10

2

nd Order

High-pass Filter

FC = 0.1 Hz

G = 10

Scope

Figure 7-3. 1/f Noise Test Setup

Figure 7-4 shows typical distribution of flicker noise for multiple devices where more than 1000 samples are

captured for each device.

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REF53-Q1

SNVSCU8 – AUGUST 2026

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Product Folder Links: REF53-Q1