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ADR430_11

更新时间： 2024-11-12 08:19:43
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Ultralow Noise XFET Voltage References with Current Sink and Source Capability

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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 10.0 Hz): 3.5 μV p-p @ 2.5 V output  
No external capacitor required  
Low temperature coefficient  
A Grade: 10 ppm/°C maximum  
B Grade: 3 ppm/°C maximum  
Load regulation: 15 ppm/mA  
Line regulation: 20 ppm/V  
TP  
1
2
3
4
8
7
6
5
TP  
ADR43x  
V
COMP  
IN  
TOP VIEW  
NIC  
V
OUT  
(Not to Scale)  
GND  
TRIM  
NOTES  
1. NIC = NO INTERNAL CONNECTION  
2. TP = TEST PIN (DO NOT CONNECT)  
Figure 1. 8-Lead MSOP (RM-8)  
Wide operating range  
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  
ADR43x  
V
COMP  
IN  
TOP VIEW  
NIC  
V
OUT  
(Not to Scale)  
GND  
TRIM  
ADR439: 6.5 V to 18 V  
High output source and sink current: +30 mA and −20 mA  
Wide temperature range: −40°C to +125°C  
NOTES  
1. NIC = NO INTERNAL CONNECTION  
2. TP = TEST PIN (DO NOT CONNECT)  
Figure 2. 8-Lead SOIC_N (R-8)  
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 Analog Devices, Inc., patented temperature  
drift curvature correction and XFET (eXtra implanted junction  
FET) technology, voltage change vs. temperature nonlinearity in  
the ADR43x is minimized.  
Table 1. Selection Guide  
Temperature  
Coefficient  
(ppm/°C)  
Output  
Voltage (V)  
Model  
Accuracy (mV)  
ADR430A  
ADR430B  
ADR431A  
ADR431B  
ADR433A  
ADR433B  
ADR434A  
ADR434B  
ADR435A  
ADR435B  
ADR439A  
ADR439B  
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
1
3
1
4
1.5  
5
1.5  
6
2
10  
3
10  
3
10  
3
10  
3
10  
3
10  
3
The XFET references operate at lower current (800 μA) and  
lower supply voltage headroom (2 V) than buried Zener  
references. Buried Zener references require more than 5 V  
headroom for operation. The ADR43x XFET references are  
the only low noise solutions for 5 V systems.  
The ADR43x family has the capability to source up to 30 mA of  
output current and sink up to 20 mA. It also comes with a trim  
terminal to adjust the output voltage over a 0.5% range without  
compromising performance.  
5.5  
2
The ADR43x is available in 8-lead MSOP and 8-lead narrow  
SOIC packages. All versions are specified over the extended  
industrial temperature range of −40°C to +125°C.  
Rev. J  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700 www.analog.com  
Fax: 781.461.3113 ©2003–2011 Analog Devices, Inc. All rights reserved.  
 
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