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ADR421

PRODUCTION

Ultraprecision, Low Noise, 2.500 V XFET® Voltage References

Data Sheet (Rev. J) Product Selection Table
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Overview

  • Low noise (0.1 Hz to 10 Hz) 
    • ADR420: 1.75 μV p-p
    • ADR421: 1.75 μV p-p 
    • ADR423: 2.0 μV p-p 
    • ADR425: 3.4 μV p-p
  • Low temperature coefficient: 3 ppm/°C
  • Long-term stability: 50 ppm/1000 hours
  • Load regulation: 70 ppm/mA
  • Line regulation: 35 ppm/V
  • Low hysteresis: 40 ppm typical
  • Wide operating range 
    • ADR420: 4 V to 18 V 
    • ADR421: 4.5 V to 18 V 
    • ADR423: 5 V to 18 V 
    • ADR425: 7 V to 18 V
  • Quiescent current: 0.5 mA maximum
  • High output current: 10 mA
  • Wide temperature range: −40°C to +125°C

The ADR42x are a series of ultraprecision, second generation eXtra implanted junction FET (XFET) voltage references featuring low noise, high accuracy, and excellent long-term stability in SOIC and MSOP footprints.

Patented temperature drift curvature correction technique and XFET technology minimize nonlinearity of the voltage change with temperature. The XFET architecture offers superior accuracy and thermal hysteresis to the band gap references. It also operates at lower power and lower supply headroom than the buried Zener references.

The superb noise and the stable and accurate characteristics of the ADR42x make them ideal for precision conversion applications such as optical networks and medical equipment. The ADR42x trim terminal can also be used to adjust the out-put voltage over a ±0.5% range without compromising any other performance. The ADR42x series voltage references offer two electrical grades and are specified over the extended industrial temperature range of −40°C to +125°C. Devices have 8-lead SOIC or 30% smaller, 8-lead MSOP packages.

Applications

  • Precision data acquisition systems
  • High resolution converters
  • Battery-powered instrumentation
  • Portable medical instruments
  • Industrial process control systems
  • Precision instruments
  • Optical network control circuits
ADR421
Ultraprecision, Low Noise, 2.500 V XFET® Voltage References
ADR420/ADR421/ADR423/ADR425 Functional Block Diagram ADR420/ADR421/ADR423/ADR425 Pin Configuration
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Documentation

Data Sheet 1

Application Note 11

Technical Articles 1

Frequently Asked Question 1

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Hardware Ecosystem

Parts Product Life Cycle Description
LDO Linear Regulators 1
LT3040
RECOMMENDED FOR NEW DESIGNS 20V, 200mA, Ultralow Noise, Ultrahigh PSRR Precision DAC/Reference Buffer
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Reference Designs

Precision DAC Configuration
Precision DAC Configuration
CN0169 Circuits from the lab

How to Achieve High Precision Voltage Level Setting Using the AD5542A/AD5541A 16-Bit Voltage Output DAC

View Detailed Reference Design

Features and Benefits

  • True 16 bit programmable voltage output
  • INL and DNL both better than 1 LSB
  • Small footprint and low cost
16-Channel, 16-Bit Data Acquisition System Using Two AD7606 8-Channel DAS
16-Channel, 16-Bit Data Acquisition System Using Two AD7606 8-Channel DAS
CN0148 Circuits from the lab

Layout Considerations for an Expandable Multichannel Simultaneous Sampling Data Acquisition System (DAS) Based on the AD7606 16-Bit, 8-Channel DAS

View Detailed Reference Design

Features and Benefits

  • Mutlichannel simultaneous sampling data acquisition system
  • Layout guidelines for 16 bit performance
Precision DAC Configuration
Precision DAC Configuration
CN0181 Circuits from the lab

Precision, 16-Bit, Voltage Level Setting with Less than 5 mW Total Power Dissipation

View Detailed Reference Design

Features and Benefits

  • True 16 bit voltage output DAC w/buffer
  • Small footprint saves board space and lowers cost
  • Low power consumption
Software Calibrated RF Measurement System
Software Calibrated RF Measurement System
CN0150 Circuits from the lab

Software Calibrated, 1 MHz to 8 GHz, 60 dB RF Power Measurement System Using the AD8318 Logarithmic Detector

View Detailed Reference Design

Features and Benefits

  • Software calibrated RF power measurement system
  • RMS, peak, and crest factor outputs
  • Functions from 1 MHz to 8 GHz
Precision DAC Configuration
Precision DAC Configuration
CN0079 Circuits from the lab

High Precision Digital-to-Analog Conversion Using the 16-Bit AD5542/AD5541 Voltage Output DAC, ADR421 Reference, and AD8628 Auto-Zero Op Amp

View Detailed Reference Design

Features and Benefits

  • Precision Digital to Analog Conversion
  • Auto Zero Op-Amp Reduces Digital Switching Noise for 16-Bit DAC
Figure 1. Low Cost, 8-Channel, Simultaneously Sampled, Data Acquisition System (Simplified Schematic: All Connections and Decoupling Not Shown)
Figure 1. Low Cost, 8-Channel, Simultaneously Sampled, Data Acquisition System (Simplified Schematic: All Connections and Decoupling Not Shown)
CN0175 Circuits from the lab

A Low Cost, 8-Channel, Simultaneously Sampled, Data Acquisition System with 84 dB SNR and Excellent Channel-to-Channel Matching

View Detailed Reference Design

Features and Benefits

  • Multichannel simultaneous sampling data acquisition system
  • 14 bit SAR ADC with >80 dB dynamic range
  • Integrated protection, amplifiers, and filtering
CN0169
How to Achieve High Precision Voltage Level Setting Using the AD5542A/AD5541A 16-Bit Voltage Output DAC
Precision DAC Configuration
CN0148
Layout Considerations for an Expandable Multichannel Simultaneous Sampling Data Acquisition System (DAS) Based on the AD7606 16-Bit, 8-Channel DAS
16-Channel, 16-Bit Data Acquisition System Using Two AD7606 8-Channel DAS
CN0181
Precision, 16-Bit, Voltage Level Setting with Less than 5 mW Total Power Dissipation
Precision DAC Configuration
CN0150
Software Calibrated, 1 MHz to 8 GHz, 60 dB RF Power Measurement System Using the AD8318 Logarithmic Detector
Software Calibrated RF Measurement System
CN0079
High Precision Digital-to-Analog Conversion Using the 16-Bit AD5542/AD5541 Voltage Output DAC, ADR421 Reference, and AD8628 Auto-Zero Op Amp
Precision DAC Configuration
CN0175
A Low Cost, 8-Channel, Simultaneously Sampled, Data Acquisition System with 84 dB SNR and Excellent Channel-to-Channel Matching
Figure 1. Low Cost, 8-Channel, Simultaneously Sampled, Data Acquisition System (Simplified Schematic: All Connections and Decoupling Not Shown)

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