REF70 2 ppm/°C Maximum Drift, 0.23 ppmp-p 1/f Noise, Precision Voltage Reference

1 Features

• Low noise enables precision measurements:

– 1/f Noise (0.1 Hz to 10 Hz): 0.23 ppmp-p

– 10 Hz to 1 kHz: 0.35 ppmrms

• Low temperature drift coefficient:

– 2 ppm/°C maximum (-40°C to 125°C)

• High accuracy: ±0.025% maximum

• Humidity resistant hermetic ceramic package

(LCCC)

• Excellent long-term stability (1k hr): 35 ppm

• Low dropout: 400 mV

• Designed for a wide range of applications:

– Wide input voltage up to 18 V

– Output current: ±10 mA

– Voltage options: 1.25 V, 2.5 V, 3 V, 3.3 V, 4.096

V, 5 V

• Ultra-flexible solution:

– Stable with 1-μF to 100-μF output low-ESR

capacitor

– High PSRR: 107 dB at 1 kHz

– Operating temperature range: −40°C to +125°C

2 Applications

• Semiconductor test equipment

• Precision data acquisition systems

• Precision weight scales

• Ultrasound scanner

• X-ray systems

• Industrial instrumentation

• PLC analog I/O modules

• Field transmitters

• Power monitoring

3 Description

The REF70 is a family of high precision series voltage

references that offers the industry’s lowest noise

(0.23 ppmp-p), very low temperature drift coefficient

(2 ppm/°C), and high accuracy (±0.025%). The

REF70 offers a high PSRR, low drop-out voltage

and excellent load and line regulation to help meet

strict transient requirements. This combination of

precision and features is designed for applications

such as test and measurement that demand a precise

reference to be paired with precision, high-resolution

data converters such as ADS8900B, ADS127L01 and

DAC11001A, to achieve optimal performance in the

signal chain. The REF70 is also designed for noise-

sensitive medical applications such as ultrasound and

X-ray to help enable low-noise measurements from

the analog front end.

The REF70 family is available in VSSOP and LCCC

package options. The LCCC (FKH) package is a

hermetically sealed ceramic package that allows for

low, long-term drift for applications that require a

stable reference over a long time period without

calibration.

The REF70 is specified for the wide temperature

range of −40°C to +125°C. The wide temperature

range enables operation across various industrial

applications.

Device Information

PART NAME

PACKAGE (1)

BODY SIZE (NOM)

REF70

LCCC (8)

5.00 mm × 5.00 mm

VSSOP (8) (2)

3.00 mm x 3.00 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet.

(2)

Package preview. Samples available for evaluation.

Noise (ppmp-p)

0

0.08

0.16

0.24

0.32

0.4

0.48

0.56

0.64

0.1-Hz to 10-Hz Voltage Noise Distribution

Temperature (°C)

-50

-25

0

25

50

75

100

125

2.499

2.49925

2.4995

2.49975

2.5

2.50025

2.5005

2.50075

2.501

Output Voltage Vs Free-Air-Temperature

REF70

SNAS781E – OCTOBER 2020 – REVISED JULY 2022

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.