Ultralow Noise XFET® Voltage References
with Current Sink and Source Capability
ADR430/ADR431/ADR433/ADR434/ADR435/ADR439
PIN CONFIGURATIONS
FEATURES
Low noise (0.1 Hz to 10 Hz): 3.5 µV p-p @ 2.5 V output
No external capacitor required
Low temperature coefficient
A Grade: 10 ppm/°C max
TP
1
2
3
4
8
7
6
5
TP
ADR43x
TOP VIEW
(Not to Scale)
V
IN
NC
NC
V
OUT
GND
TRIM
B Grade: 3 ppm/°C max
NC = NO CONNECT
Load regulation: 15 ppm/mA
Line regulation: 20 ppm/V
Wide operating range
Figure 1. 8-Lead MSOP
(RM Suffix)
ADR430: 4.1 V to 18 V
ADR431: 4.5 V to 18 V
ADR433: 5.0 V to 18 V
ADR434: 6.1 V to 18 V
ADR435: 7.0 V to 18 V
TP
1
2
3
4
8
7
6
5
TP
NC
V
ADR43x
TOP VIEW
(Not to Scale)
V
IN
NC
OUT
GND
TRIM
ADR439: 6.5 V to 18 V
NC = NO CONNECT
High output current: +30 mA/−20 mA
Wide temperature range: −40°C to +125°C
Figure 2. 8-Lead SOIC
(R Suffix)
APPLICATIONS
Precision data acquisition systems
High resolution data converters
Medical instruments
Industrial process control systems
Optical control circuits
Precision instruments
GENERAL DESCRIPTION
The ADR43x series is a family of XFET voltage references
featuring low noise, high accuracy, and low temperature drift
performance. Using ADI’s patented temperature drift curvature
correction and XFET (eXtra implanted junction FET) technology,
the ADR43x’s voltage change versus temperature nonlinearity is
minimized.
All versions are specified over the extended industrial tempera-
ture range (−40°C to +125°C).
Table 1. Selection Guide
Accuracy
VOUT (V) (mV)
Temperature Coefficient
(ppm/°C)
Model
ADR430B
ADR430A
ADR43±B
ADR43±A
ADR433B
ADR433A
ADR434B
ADR434A
ADR435B
ADR435A
ADR439B
ADR439A
2.048
2.048
2.500
2.500
3.000
3.000
4.096
4.096
5.000
5.000
4.500
4.500
±±
±3
±±
±3
±±.4
±4
±±.5
±5
±2
±6
3
±0
3
±0
3
±0
3
±0
3
±0
3
The XFET references operate at lower current (800 µA) and
supply headroom (2 V) than buried-Zener references. Buried-
Zener references require more than 5 V headroom for operations.
The ADR43x XFET references are the only low noise solutions
for 5 V systems.
The ADR43x series has the capability to source up to 30 mA
and sink up to 20 mA of output current. It also comes with a
TRIM terminal to adjust the output voltage over a 0.5% range
without compromising performance. The ADR43x is available
in the 8-lead mini SOIC and 8-lead SOIC packages.
±2
±5.4
±0
Rev. B
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