Noise (ppmp-p)

0

20

40

60

80

100

0

1

2

3

4

5

6

7

8

9

10

Figure 7-4. From 0.1Hz to 10Hz Voltage Noise Distribution

7.3.2 Broadband Noise

Broadband noise or white noise is flat over the whole spectrum which is restricted by the bandwidth of internal

bandgap reference. The broadband noise is measured by high-pass filtering the output of the REF53-Q1

and measuring the result on a precision spectrum analyzer as Figure 7-5 shows. The DC component of the

REF53-Q1 is removed by using a high-pass filter and then amplified. Two stages of small gain maximize the

noise bandwidth analysis.

REF

GND

VREF

VIN

EN

VIN

CREF

CIN

VREF

High-pass Filter

G = 11

Post Amplifier

G = 11

Spectrum

Analyzer

Figure 7-5. Broadband Noise Test Setup

Figure 7-6 shows the typical white noise floor for REF53-Q1.

Frequency (Hz)

1x101

1x102

1x103

1x104

1x105

0

100

200

300

400

500

Figure 7-6. Noise Performance From 10Hz to 100kHz (CREF) = 10μF

7.4 Thermal Hysteresis

Thermal hysteresis is measured with the REF53-Q1 soldered to a PCB, similar to a real-world application.

Thermal hysteresis for the device is defined as the change in output voltage after operating the device at 25°C,

REF53-Q1

SNVSCU8 – AUGUST 2026

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