REF3425, REF3430, REF3433, REF3440, REF3450
SBAS804F – SEPTEMBER 2017 – REVISED JUNE 2021
REF34xx Low-Drift, Low-Power, Small-Footprint Series Voltage Reference
1 Features
3 Description
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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)
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.
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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
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.
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Data acquisition systems
Analog I/O modules
Field transmitters
Lab & field instrumentation
Servo drive control modules
DC power supply, AC source, electronic load
REF34xx is specified for the wide temperature range
of −40°C to +125°C.
Voltage Reference Recommendation for Data
Converters
Device Information
ADC
DAC RESOLUTION
PART NAME
PACKAGE (1)
BODY SIZE (NOM)
VOLTAGE REFERENCE RESOLUTION
(1)
(1)
REF34xx
REF34xxT
SOT-23 (6)
2.90 mm × 1.60 mm
TL431LI, TLV431
LM4040, LM4050, REF30
REF31, REF33, REF4132
REF34, REF50
10-b
12-b
8-b
10-b
(1) For all available packages, see the orderable addendum at
the end of the data sheet
14-b to 16-b
16-b to 18-b
18-b+
12-b
14-b to 16-b
16-b+
REF70
(1) For specific ADC/DAC recommendations, see SNAA320
10 ꢀ
10 ꢀ
0.4
25°C
125°C
-40°C
0.36
124 ꢀ
-
0.32
ADS1287
REF
Input Signal
1 nF
+
0.28
0.24
0.2
VIN
REF34xx
CIN
1µF
COUT
10 µF
0.16
0.12
0.08
0.04
0
Copyright © 2017, Texas Instruments Incorporated
Simplified Schematic
0
5
Load Current (mA)
10
Dropout vs. Current Load Over Temperature
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.