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ADR431B View Datasheet(PDF) - Analog Devices

Part NameADR431B ADI
Analog Devices ADI
DescriptionUltralow Noise XFET® Voltage References with Current Sink and Source Capability
ADR431B Datasheet PDF : 24 Pages
First Prev 21 22 23 24 Next Last
ADR430/ADR431/ADR433/ADR434/ADR435/ADR439
PRECISION BOOSTED OUTPUT REGULATOR
A precision voltage output with boosted current capability can
be realized with the circuit shown in Figure 43. In this circuit,
U2 forces VO to be equal to VREF by regulating the turn-on of
N1. Therefore, the load current is furnished by VIN. In this
configuration, a 50 mA load is achievable at a VIN of 5 V. Moderate
heat is generated on the MOSFET, and higher current can be
achieved with a replacement of the larger device. In addition,
for a heavy capacitive load with step input, a buffer can be
added at the output to enhance the transient response.
VIN
2
VIN
U1
ADR431
VOUT 6
TRIM 5
GND
4
N1
5V
2N7002
+
U2 V+
AD8601
V–
VO
RL
25
Figure 43. Precision Boosted Output Regulator
Rev. J | Page 21 of 24
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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.

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
   B Grade: 3 ppm/°C max
Load regulation: 15 ppm/mA
Line regulation: 20 ppm/V
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
   ADR439: 6.5 V to 18 V
High output current: +30 mA/−20 mA
Wide temperature range: −40°C to +125°C

APPLICATIONS
Precision data acquisition systems
High resolution data converters
Medical instruments
Industrial process control systems
Optical control circuits
Precision instruments

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