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REF35 Ultra Low-Power, High-Precision Voltage Reference
SNAS809C
December 2021 – September 2024
REF35
PRODUCTION DATA
CONTENTS
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REF35 Ultra Low-Power, High-Precision Voltage Reference
1
1
Features
2
Applications
3
Description
4
Device Comparison
5
Pin Configuration and Functions
6
Specifications
6.1
Absolute Maximum Ratings
6.2
ESD Ratings
6.3
Recommended Operating Conditions
6.4
Thermal Information
6.5
Electrical Characteristics
6.6
Electrical Characteristics YBH package
6.7
Typical Characteristics
7
Parameter Measurement Information
7.1
Solder Heat Shift
7.2
Temperature Coefficient
7.3
Long-Term Stability
7.4
Thermal Hysteresis
7.5
Noise Performance
7.5.1
Low-Frequency (1/f) Noise
7.5.2
Broadband Noise
7.6
Power Dissipation
8
Detailed Description
8.1
Overview
8.2
Functional Block Diagram
8.3
Feature Description
8.3.1
Supply Voltage
8.3.2
EN Pin
8.3.3
NR Pin
8.4
Device Functional Modes
8.4.1
Basic Connections
8.4.2
Start-Up
8.4.3
Output Transient Behavior
9
Application and Implementation
9.1
Application Information
9.2
Typical Applications
9.2.1
Negative Reference Voltage
9.2.2
Precision Power Supply and Reference
9.2.2.1
Design Requirements
9.2.2.2
Detailed Design Procedure
9.2.2.2.1
Selection of Reference
9.2.2.2.2
Input and Output Capacitors
9.2.2.2.3
Selection of ADC
9.2.2.3
Application Curves
9.3
Power Supply Recommendations
9.4
Layout
9.4.1
Layout Guidelines
9.4.2
Layout Examples
10
Device and Documentation Support
10.1
Documentation Support
10.1.1
Related Documentation
10.2
Receiving Notification of Documentation Updates
10.3
Support Resources
10.4
Trademarks
10.5
Electrostatic Discharge Caution
10.6
Glossary
11
Revision History
12
Mechanical, Packaging, and Orderable Information
IMPORTANT NOTICE
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Data Sheet
REF35 Ultra Low-Power, High-Precision Voltage Reference
1
Features
Ultra-low quiescent current:
650nA (typical)
Initial accuracy: ±0.05% (maximum)
Temperature coefficient (maximum):
12ppm/°C (−40°C to 105°C, SOT23 package)
10ppm/°C (−40°C to 85°C, WCSP package)
Output 1/f noise (0.1Hz to 10Hz): 3.3ppm
P-P
NR pin to reduce noise
EN pin to reduce shutdown current consumption
Long-term stability: 40ppm at 1k hour
Thermal hysteresis: 70ppm
Operating temperature range: −55°C to +125°C
Output current: +10mA, −5mA
Input voltage: V
REF
+ V
DO
to 6V
Output voltage options:
1.024V, 1.2V, 1.25V, 1.6V, 1.8V, 2.048V,
2.5V, 3.0V, 3.3V, 4.096V, 5.0V
Small footprint 6-pin SOT−23 package
Smallest footprint 4-pin WCSP package
2
Applications
Flow transmitter
Blood glucose monitor
Servo drive control module
Power quality analyzer
Fault indicator
Oscilloscope
Process analytics
Optical Module
