REF34xx Low-Drift, Low-Power, Small-Footprint Series Voltage Reference

1 Features

• Initial accuracy: ±0.05% (maximum)

• Temperature coefficient : 6 ppm/°C (maximum)

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

• Output current: ±10 mA

• Low quiescent current: 95 μA (maximum)

• Ultra-low zero load dropout voltage: 100 mV

(maximum)

• Wide input voltage: 12 V

• Output 1/f noise (0.1 Hz to 10 Hz): 3.8 µVp-p/V

• Excellent long-term stability 25 ppm/1000 hrs

• Multiple small footprint 6 pin SOT-23 package

pinouts: REF34xx and REF34xxT

2 Applications

• Data acquisition systems

• Analog I/O modules

• Field transmitters

• Lab & field instrumentation

• Servo drive control modules

• DC power supply, AC source, electronic load

Voltage Reference Recommendation for Data

Converters

VOLTAGE REFERENCE

ADC

RESOLUTION

(1)

DAC RESOLUTION

(1)

TL431LI, TLV431

10-b

8-b

LM4040, LM4050, REF30

12-b

10-b

REF31, REF33, REF4132

14-b to 16-b

12-b

REF34, REF50

16-b to 18-b

14-b to 16-b

REF70

18-b+

16-b+

(1)

For specific ADC/DAC recommendations, see SNAA320

3 Description

The REF34xx device is a low temperature drift

(6 ppm/°C), low-power, high-precision CMOS voltage

reference, featuring ±0.05% initial accuracy, low

operating current with power consumption less than

95 μA. This device also offers very low output noise of

3.8 μVp-p /V, which enables its ability to maintain high

signal integrity with high-resolution data converters in

noise critical systems. With a small SOT-23 package,

REF34xx offers enhanced specifications and pin-to-

pin replacement for MAX607x, ADR34xx and LT1790

(REF34xxT, no EN pin). The REF34xx family is

compatible to most of the ADC and DAC such as

ADS1287, DAC8802 and ADS1112.

Stability and system reliability are further improved

by the low output-voltage hysteresis of the device

and low long-term output voltage drift. Furthermore,

the small size and low operating current of the

devices (95 μA) benefit portable and battery-powered

applications.

REF34xx is specified for the wide temperature range

of −40°C to +125°C.

Device Information

PART NAME

PACKAGE (1)

BODY SIZE (NOM)

REF34xx

REF34xxT

SOT-23 (6)

2.90 mm × 1.60 mm

(1)

For all available packages, see the orderable addendum at

the end of the data sheet

10

10

Input Signal

124

1 nF

ADS1287

VIN

REF

CIN

1µF

COUT

10 µF

-

+

REF34xx

Copyright © 2017, Texas Instruments Incorporated

Simplified Schematic

Load Current (mA)

0

0.04

0.08

0.12

0.16

0.2

0.24

0.28

0.32

0.36

0.4

5

10

0

25°C

125°C

-40°C

Dropout vs. Current Load Over Temperature

REF3425, REF3430, REF3433, REF3440, REF3450

SBAS804F – SEPTEMBER 2017 – REVISED JUNE 2021

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. PRODUCTION DATA.