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Series voltage references

REF5045

ACTIVE

4.5-V, 3-µVpp/V noise, 3-ppm/°C drift precision series voltage reference

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Data sheet

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REF70 ACTIVE Ultra-high-precision voltage reference with low noise and low drift REF70 offers 10x lower noise (0.23 ppm), better drift performance (2 ppm/°C) and 28-ppm long-term drift in a humidity-resistant ceramic package.

REF5045

ACTIVE
Data sheet Order now

Product details

VO (V) 4.5 Initial accuracy (max) (%) 0.05 Temp coeff (max) (ppm/°C) 3 Vin (min) (V) 4.7 Vin (max) (V) 18 Iq (typ) (mA) 0.8 Rating Catalog Features TRIM/NR pin LFN 0.1 to 10 Hz (typ) (µVPP) 13.5 Iout/Iz (max) (mA) 10 Operating temperature range (°C) -40 to 125
VO (V) 4.5 Initial accuracy (max) (%) 0.05 Temp coeff (max) (ppm/°C) 3 Vin (min) (V) 4.7 Vin (max) (V) 18 Iq (typ) (mA) 0.8 Rating Catalog Features TRIM/NR pin LFN 0.1 to 10 Hz (typ) (µVPP) 13.5 Iout/Iz (max) (mA) 10 Operating temperature range (°C) -40 to 125
SOIC (D) 8 29.4 mm² 4.9 x 6 VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • Low temperature drift:
    • High-grade: 3 ppm/°C (maximum)
    • Standard-grade: 8 ppm/°C (maximum)
  • High accuracy:
    • High-grade: 0.05% (maximum)
    • Standard-grade: 0.1% (maximum)
  • Low noise: 3 µV PP/V
  • Excellent long-term stability:
    • 22 ppm after first 1000 hours (SOIC-8)
    • 50 ppm after first 1000 hours (VSSOP-8)
  • High-output current: ±10 mA
  • Temperature range: –40°C to 125°C
  • Low temperature drift:
    • High-grade: 3 ppm/°C (maximum)
    • Standard-grade: 8 ppm/°C (maximum)
  • High accuracy:
    • High-grade: 0.05% (maximum)
    • Standard-grade: 0.1% (maximum)
  • Low noise: 3 µV PP/V
  • Excellent long-term stability:
    • 22 ppm after first 1000 hours (SOIC-8)
    • 50 ppm after first 1000 hours (VSSOP-8)
  • High-output current: ±10 mA
  • Temperature range: –40°C to 125°C

The REF50xx is a family of low-noise, low-drift, very high precision voltage references. These references are capable of both sinking and sourcing current, and have excellent line and load regulation.

Excellent temperature drift (3 ppm/°C) and high accuracy (0.05%) are achieved using proprietary design techniques. These features, combined with very low noise, make the REF50xx family an excellent choice for use in high-precision data acquisition systems.

Each reference voltage is available in both high grade (REF50xxIDGK and REF50xxID) and standard grade (REF50xxAIDGK and REF50xxAID). The reference voltages are offered in 8-pin VSSOP and SOIC packages, and are specified from –40°C to 125°C.

The REF50xx is a family of low-noise, low-drift, very high precision voltage references. These references are capable of both sinking and sourcing current, and have excellent line and load regulation.

Excellent temperature drift (3 ppm/°C) and high accuracy (0.05%) are achieved using proprietary design techniques. These features, combined with very low noise, make the REF50xx family an excellent choice for use in high-precision data acquisition systems.

Each reference voltage is available in both high grade (REF50xxIDGK and REF50xxID) and standard grade (REF50xxAIDGK and REF50xxAID). The reference voltages are offered in 8-pin VSSOP and SOIC packages, and are specified from –40°C to 125°C.
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Technical documentation

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Type Title Date
* Data sheet REF50xx Low-Noise, Very Low Drift, Precision Voltage Reference datasheet (Rev. K) PDF | HTML 15 Jun 2023
Application note Voltage Reference Selection and Design Tips For Data Converters (Rev. B) PDF | HTML 09 Jan 2024
Application note Stacking the REF50xx for High-Voltage References (Rev. B) PDF | HTML 25 Apr 2023
E-book Tips and tricks for designing with voltage references (Rev. A) 07 May 2021
Application note Long-Term Drift in Voltage References PDF | HTML 25 Mar 2021
Application note Low-Noise Negative Reference Design with REF5025 01 Dec 2019
E-book Voltage Supervisor and Reset ICs: Tips, Tricks and Basics 28 Jun 2019
Circuit design High-input impedance, true differential, AFE attenuator circuit for SAR ADCs (Rev. A) 08 Mar 2019
White paper Voltage reference selection basics white paper (Rev. A) 23 Oct 2018
White paper Voltage-reference impact on total harmonic distortion 01 Aug 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

BOOSTXL-ADS7841-Q1 — ADS7841-Q1 12-bit 4-channel serial output sampling ADC BoosterPack™ plug-in module

BOOSTXL-ADS7841-Q1 is a platform for evaluating the performance of the ADS7841-Q1 4-channel, 12-bit, SAR ADC with an SPI-compatible serial interface. The evaluation kit includes the ADS7841-Q1 BoosterPack™ plug-in module and PC software that enables the user to configure the (...)

User guide: PDF
Not available on TI.com
Evaluation board

BOOSTXL-TLC2543 — TLC2543-Q1 12-Bit ADC With Serial Control and 11 Analog Inputs BoosterPack™ Plug-in Module

BOOSTXL-TLC24531 is a platform for evaluating the performance of the TLC2453-Q1, which is an 11-channel, 12-bit successive approximation register (SAR) analog-to-digital converter (ADC) with a SPI-compatible serial interface. The evaluation kit includes the TLC2453-Q1 BoosterPack board and PC (...)

User guide: PDF
Not available on TI.com
Evaluation board

DIP-ADAPTER-EVM — DIP adapter evaluation module

Speed up your op amp prototyping and testing with the DIP adapter evaluation module (DIP-ADAPTER-EVM), which provides a fast, easy and inexpensive way to interface with small surface-mount ICs. You can connect any supported op amp using the included Samtec terminal strips or wire them (...)

User guide: PDF
Not available on TI.com
Simulation model

REF5045 PSpice Model (Rev. A)

SLIM172A.ZIP (39 KB) - PSpice Model
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Simulation model

REF5045 TINA-TI Reference Design (Rev. A)

SLIM171A.TSC (130 KB) - TINA-TI Reference Design
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Simulation model

REF5045 TINA-TI Spice Model (Rev. A)

SLIM170A.ZIP (7 KB) - TINA-TI Spice Model
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Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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Reference designs

TIPD115 — Data acquisition optimized for low distortion, low noise 18-bit 1-MSPS reference design

This verified design is a high performance data acquisition system (DAQ) using an 18-bit SAR ADC, ADS8881 at a throughput of 1MSPS. This design has been optimized to provide the lowest noise & distortion solution for a full scale input sinewave of 10 KHz. This leads to a maximum possible value (...)
User guide: PDF
Schematic: PDF
Reference designs

TIPD113 — Data acquisition, 10-kHz AC, 35-mW 18-bit 1-MSPS reference design

This verified design is a high performance data acquisition system (DAQ) using an 18-bit SAR ADC, ADS8881 at a throughput of 1MSPS. This design has been optimized to provide the lowest power solution for a full scale input sine wave of 10 KHz. At a total power consumption of less than 35mW, this (...)
User guide: PDF
Schematic: PDF
Reference designs

TIPD112 — Data Acquisition for MUX and Step Inputs, 18 bits, 1uS Full Scale Response Reference Design

This verified design is a high performance data acquisition system (DAQ) using an 18-bit SAR ADC, ADS8881 at a throughput of 1MSPS. This design has been optimized to provide 18-bit settling performance for a Full Scale Step Input signal, thus leading to excellent system linearity. Such an input (...)
User guide: PDF
Schematic: PDF
Reference designs

TIDA-00732 — 18-bit, 2-Msps Isolated Data Acquisition Reference Design to Achieve Maximum SNR and Sampling Rate

This “18-bit, 2-Msps Isolated Data Acquisition Reference Design to achieve maximum SNR and sampling rate”  illustrates how to overcome performance-limiting challenges typical of isolated data acquisition system design:
  • Maximizing sampling rate by minimizing propagation delay introduced by digital (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIPD169 — 16-Bit, 1MSPS Multiplexed Data Acquisition Reference Design

This design is for a 16-bit 1MSPS single-ended, multiplexed data acquisition system (DAQ) for dc inputs. The system is composed of a 16-bit successive-approximation-register (SAR) analog-to-digital converter (ADC), SAR ADC driver, reference driver, and multiplexer. The design shows the process to (...)
Design guide: PDF
Schematic: PDF
Package Pins Download
SOIC (D) 8 View options
VSSOP (DGK) 8 View options
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