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
ADR443: 1.4 μV p-p
ADR444: 1.8 μV p-p
ADR445: 2.25 μV p-p
Superb temperature coefficient
A grade: 10 ppm/°C
ADR440/
TP
1
2
3
4
8
7
6
5
TP
ADR441/
ADR443/
ADR444/
ADR445
V
NC
IN
NC
V
OUT
TOP VIEW
(Not to Scale)
GND
TRIM
NOTES
1. NC = NO CONNECT
2. TP = TEST PIN (DO NOT CONNECT)
Figure 1. 8-Lead SOIC_N (R-Suffix)
B grade: 3 ppm/°C
Low dropout operation: 500 mV
Input range: (VOUT + 500 mV) to 18 V
High output source and sink current
+10 mA and −5 mA, respectively
Wide temperature range: −40°C to +125°C
ADR440/
TP
1
2
3
4
8
7
6
5
TP
NC
V
ADR441/
ADR443/
ADR444/
ADR445
V
IN
NC
OUT
TOP VIEW
(Not to Scale)
GND
TRIM
APPLICATIONS
NOTES
1. NC = NO CONNECT
2. TP = TEST PIN (DO NOT CONNECT)
Precision data acquisition systems
High resolution data converters
Battery-powered instrumentation
Portable medical instruments
Industrial process control systems
Precision instruments
Figure 2. 8-Lead MSOP (RM-Suffix)
Optical control circuits
GENERAL DESCRIPTION
Offered in two electrical grades, the ADR44x family is avail-
able in 8-lead MSOP and narrow SOIC packages. All versions
are specified over the extended industrial temperature range of
−40°C to +125°C.
The ADR44x series is a family of XFET® voltage references
featuring ultralow noise, high accuracy, and low temperature
drift performance. Using Analog Devices, Inc., patented
temperature drift curvature correction and XFET (eXtra
implanted junction FET) technology, voltage change vs.
temperature nonlinearity in the ADR44x is greatly minimized.
Table 1. Selection Guide
Output
Voltage
(V)
Initial
Accuracy
(mV)
Temperature
Coefficient
(ppm/°C)
The XFET references offer better noise performance than
buried Zener references, and XFET references operate off
low supply voltage 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 applications.
Model
ADR440A 2.048
ADR440B 2.048
ADR441A 2.500
ADR441B 2.500
ADR44±A ±.000
ADR44±B ±.000
ADR444A 4.096
ADR444B 4.096
ADR445A 5.000
ADR445B 5.000
±±
±1
±±
±1
±4
±1.2
±5
±1.6
±6
±2
10
±
10
±
10
±
10
±
The ADR44x family has the capability to source up to 10 mA of
output current and sink up to −5 mA. It also comes with a trim
terminal to adjust the output voltage over a 0.5% range without
compromising performance.
10
±
Rev. E
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