REF35 Ultra Low-Power, High-Precision Voltage Reference

1 Features

• Ultra-low quiescent current:

– 650 nA (typical)

• Initial accuracy: ±0.05% (maximum)

• Temperature coefficient:

– 12 ppm/°C (maximum for −40°C to 105°C)

• Output 1/f noise (0.1 Hz to 10 Hz): 3.3 ppmP-P

• NR pin to reduce noise

• EN pin to reduce shutdown current consumption

• Long-term stability: 40 ppm at 1k hour

• Thermal hysteresis: 70 ppm

• Specified temperature range: −40°C to +105°C

• Operating temperature range: −55°C to +125°C

• Output current: +10 mA, −5 mA

• Input voltage: VREF + VDO to 6 V

• Output voltage options:

– 1.024 V, 1.2 V, 1.25 V, 1.6 V, 1.8 V, 2.048 V,

2.5 V, 3.0 V, 3.3 V, 4.096 V, 5.0 V

• Small footprint 6-pin SOT−23 package

• Smallest footprint 4-pin WCSP package

2 Applications

• Flow transmitter

• Blood glucose monitor

• Servo drive control module

• Power quality analyzer

• Fault indicator

• Oscilloscope

• Process analytics

• Optical Module

3 Description

The REF35 is a family of nanopower, low-drift, high-

precision series reference devices. The REF35 family

features ±0.05% initial accuracy with 650 nA typical

power consumption. The temperature coefficient (12

ppm/°C) and long-term stability (40 ppm at 1000

hours) of the device can help improve system stability

and reliability. The low power consumption combined

with high precision specifications are suitable for wide

variety of portable and low current applications.

The REF35 supplies up to 10 mA current with 3.3

ppmp-p noise and 20 ppm/mA load regulation. With

this feature set, REF35 creates a strong low-noise,

high accuracy power supply for precision sensors and

12–16b data converters.

The family is specified for operation from –40°C to

105°C and is functional over –55°C to 125°C. The

wide temperature is suited for industrial applications.

REF35 is available in wide output voltage variants

starting from 1.024 V to 5.0 V. The device is

offered in a space-saving, 6-pin SOT-23 and 4-pin

WCSP package options. Contact your local TI sales

representative for available voltage and package

options.

Package Information

PART NUMBER

PACKAGE (1)

BODY SIZE (NOM)

REF35xxx

SOT-23 (6)

2.90 mm × 1.60 mm

WCSP (4) (2)

1.05 mm × 0.84 mm

(1)

For all available voltage variants and packages, see the

orderable addendum at the end of the data sheet.

(2)

Product preview.

VIN

EN

0.1 μF

1 μF

GND

GND

GND

GND

GND

NR

VREF

Optional

Input

Output

REF35

Connection Diagram

Typical Application Use Cases

REF35

Current

SENSE

Amplifier Biasing

CSA, INA, DFA etc

REF35

V

GND

Sensor power supply

Bridge, Thermocouple etc

ADC / DAC

REF35

REF

VDD

GND

Data Converter power supply

REF35 Use Case

REF35

SNAS809A – DECEMBER 2021 – REVISED AUGUST 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. PRODUCTION DATA.