Ultralow Noise, LDO XFET® Voltage
References with Current Sink and Source
ADR440/ADR441/ADR443/ADR444/ADR445
FEATURES
PIN CONFIGURATIONS
Ultralow noise (0.1 Hz to 10 Hz)
ADR440: 1 μV p-p
ADR441: 1.2 μV p-p
TP
1
2
3
4
8
7
6
5
TP
ADR44x
V
NC
IN
TOP VIEW
NC
V
OUT
(Not to Scale)
GND
TRIM
ADR443: 1.4 μV p-p
ADR444: 1.8 μV p-p
NC = NO CONNECT
ADR445: 2.25 μV p-p
Figure 1. 8-Lead SOIC (R)
Superb temperature coefficient:
3 ppm/°C (B Grade)
10 ppm/°C (A Grade)
Low dropout operation: 500 mV
Input range: (VOUT + 500 mV) to 18 V
High output current: +10 mA/−5 mA
Wide temperature range: −40°C to +125°C
TP
1
2
3
4
8
7
6
5
TP
NC
V
ADR44x
V
IN
NC
TOP VIEW
(Not to Scale)
OUT
GND
TRIM
NC = NO CONNECT
Figure 2. 8-Lead MSOP (RM)
APPLICATIONS
Precision data acquisition systems
High resolution data converters
Battery-powered instrumentations
Portable medical instruments
Industrial process control systems
Precision instruments
Optical control circuits
GENERAL DESCRIPTION
Offered in two electrical grades, the ADR44x family is avail-
able in the 8-lead SOIC and MSOP packages. All versions
are specified over the extended industrial temperature range
(−40oC to +125oC).
The ADR44x series is a family of XFET® voltage references
featuring ultralow noise, high accuracy, and low temperature
drift performance. Using ADI’s patented temperature drift
curvature correction and XFET (eXtra implanted junction FET)
technology, the ADR44x family’s voltage change vs. temperature
nonlinearity is greatly minimized.
Table 1. Selection Guide
Temperature
VOUT (V) Accuracy (mV) Coefficient (ppm/°C)
Model
ADR440B 2.048
ADR440A 2.048
ADR44±B 2.500
ADR44±A 2.500
ADR443B 3.000
ADR443A 3.000
ADR444B 4.096
ADR444A 4.096
ADR445B 5.000
ADR445A 5.000
±±
±3
±±
±3
±±.2
±4
±±.6
±5
±2
±6
3
±0
3
±0
3
±0
3
±0
3
±0
The XFET references offer better noise performance than
buried-Zener references, and XFET references operate off
low supply headroom (0.5 V). This combination of features
makes the ADR44x family ideally suited for precision signal
conversion applications in high-end data acquisition systems,
optical networks, and medical requirements.
The ADR44x family has the capability to source up to 10 mA
and sink up to 5 mA of output current. It also comes with a
TRIM terminal to adjust the output voltage over a 0.5% range
without compromising any performance.
Rev. 0
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