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Data Sheet
Ultralow Noise XFET Voltage References with Current Sink and Source Capability ADR430/ADR431/ADR433/ADR434/ADR435
FEATURES
Low noise (0.1 Hz to 10.0 Hz): 3.5 µV p-p at 2.500 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 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 High output source and sink current: 30 mA and −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
GENERAL DESCRIPTION
The ADR430/ADR431/ADR433/ADR434/ADR4351 series is a family of XFET® voltage references featuring low noise, high accuracy, and low temperature drift performance. Using Analog Devices, Inc., temperature drift curvature correction and extra implanted junction FET (XFET) technology, voltage change vs. temperature nonlinearity in the ADR430/ADR431/ADR433/ ADR434/ADR435 is minimized.
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 of headroom for operation. The ADR430/ADR431/ADR433/ ADR434/ADR435 XFET references are low noise solutions for 5 V systems.
The ADR430/ADR431/ADR433/ADR434/ADR435 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.
04500-001
PIN CONFIGURATIONS
ADR430/ADR431 ADR433/ADR434
ADR435
DNC 1 VIN 2 NIC 3
GND 4
8 DNC
TOP VIEW (Not to Scale)
7 COMP 6 VOUT 5 TRIM
NOTES 1. NIC = NOT INTERNALLY CONNECTED.
THIS PIN IS NOT CONNECTED INTERNALLY. 2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.
Figure 1. 8-Lead MSOP (RM-8)
ADR430/ADR431 ADR433/ADR434
ADR435
DNC 1
8 DNC
VIN 2
7 COMP
NIC
3
TOP VIEW (Not to Scale)
6
VOUT
GND 4
5 TRIM
NOTES 1. NIC = NOT INTERNALLY CONNECTED.
THIS PIN IS NOT CONNECTED INTERNALLY. 2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.
Figure 2. 8-Lead SOIC_N (R-8)
04500-041
The ADR430/ADR431/ADR433/ADR434/ADR435 are 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.
Table 1. Selection Guide
Model ADR430A ADR430B ADR431A ADR431B ADR433A ADR433B ADR434A ADR434B ADR435A ADR435B
Output Voltage (V) 2.048 2.048 2.500 2.500 3.000 3.000 4.096 4.096 5.000 5.000
Initial Accuracy (mV) ±3 ±1 ±3 ±1 ±4 ±1.5 ±5 ±1.5 ±6 ±2
Temperature Coefficient (ppm/°C) 10 3 10 3 10 3 10 3 10 3
1 Protected by U.S. Patent Number 5,838,192.
Rev. N
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