Ultraprecision, Low Noise, 2.048 V/2.500 V/

ADR420/ADR421/ADR423/ADR425

Rev. I

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FEATURES

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

APPLICATIONS

Precision data acquisition systems

High resolution converters

Battery-powered instrumentation

Portable medical instruments

Industrial process control systems

Precision instruments

Optical network control circuits

PIN CONFIGURATION

NIC = NO INTERNAL CONNECTION

TP = TEST PIN (DO NOT CONNECT)

ADR420/

ADR421/

ADR423/

ADR425

TOP VIEW

(Not to Scale)

TP

8

NIC

7

6

TRIM

5

Figure 1. 8-Lead SOIC, 8-Lead MSOP

GENERAL DESCRIPTION

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.

ADR42x PRODUCTS

Table 1.

Initial Accuracy

Model

mV

%

Temperature Coefficient (ppm/°C)

ADR420

2.048

1, 3

0.05, 0.15

3, 10

ADR421

2.50

1, 3

0.04, 0.12

3, 10

ADR423

3.00

1.5, 4

0.04, 0.13

3, 10

ADR425

5.00

2, 6

0.04, 0.12

3, 10