Datasheet ADR291, ADR292 (Analog Devices)

Low Noise Micropower 2.5 V and 4.096 V Precision Voltage References ADR291 /ADR292 FEATURES CONNECTION DIAGRAMS Supply range NC 1 8 NC ADR291/ 2.8 V to 15 V, ADR291 VIN 2 7 NC ADR292 4.4 V to 15 V, ADR292 NC 3 6 TOP VIEW VOUT (Not to Scale) Supply current: 15 μA maximum GND 4 5 NC
01 0 3-
Low noise: 8 μV and 12 μV p-p (0.1 Hz to 10 Hz)
16
NC = NO CONNECT
00
High output current: 5 mA
Figure 1. 8-Lead SOIC (R-8)
Temperature range: −40°C to +125°C Pin-compatible with REF02 /REF19x NC 1 8 NC ADR291/ V 2 IN 7 NC ADR292 APPLICATIONS NC 3 TOP VIEW 6 VOUT (Not to Scale) GND 4 5 NC
2
Portable instrumentation
-00 3 16
NC = NO CONNECT Precision reference for 3 V and 5 V systems
00
Analog-to-digital and digital-to-analog converter reference
Figure 2. 8-Lead TSSOP (RU-8)
Solar-powered applications GND Loop-current-powered instruments VOUT VIN 3 2 1 ADR291
3
TOP VIEW
00 3-
(Not to Scale)
16 00 Figure 3. 3-Lead TO-92 (T-3)
GENERAL DESCRIPTION
The ADR291 and ADR292 are low noise, micropower precision coefficients for the three grades are 8 ppm/°C, 15 ppm/°C, and voltage references that use an XFET® reference circuit. The new 25 ppm/°C maximum, respectively. Line regulation and load XFET architecture offers significant performance improvements regulation are typically 30 ppm/V and 30 ppm/mA, maintaining over traditional band gap and buried Zener-based references. the reference’s overall high performance. For a device with 5.0 V Improvements include one quarter the voltage noise output of output, refer to the ADR293 data sheet. band gap references operating at the same current, very low and The ADR291 and ADR292 references are specified over the ultralinear temperature drift, low thermal hysteresis, and extended industrial temperature range of −40°C to +125°C. excellent long-term stability. Devices are available in the 8-lead SOIC, 8-lead TSSOP, and The ADR291/ADR292 family is a series of voltage references 3-lead TO-92 packages. providing stable and accurate output voltages from supplies as low as 2.8 V for the ADR291. Output voltage options are 2.5 V
Table 1. ADR291/ADR292 Product
and 4.096 V for the ADR291 and ADR292, respectively.
Temperature Output Initial Coefficient
Quiescent current is only 12 μA, making these devices ideal for
Part No. Voltage (V) Accuracy (±%) (ppm/°C) Max
battery-powered instrumentation. Three electrical grades are ADR291 2.500 0.08, 0.12, 0.24 8, 15, 25 available offering initial output accuracies of ±2 mV, ±3 mV, ADR292 4.096 0.07, 0.10, 0.15 8, 15, 25 and ±6 mV maximum for the ADR291, and ±3 mV, ±4 mV, and ±6 mV maximum for the ADR292. Temperature
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Document Outline FEATURES APPLICATIONS CONNECTION DIAGRAMS GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ADR291 ELECTRICAL SPECIFICATIONS ADR292 ELECTRICAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY THEORY OF OPERATION DEVICE POWER DISSIPATION CONSIDERATIONS BASIC VOLTAGE REFERENCE CONNECTIONS NOISE PERFORMANCE TURN-ON TIME APPLICATIONS INFORMATION HIGH VOLTAGE FLOATING CURRENT SOURCE KELVIN CONNECTIONS LOW POWER, LOW VOLTAGE REFERENCE FOR DATA CONVERTERS VOLTAGE REGULATOR FOR PORTABLE EQUIPMENT OUTLINE DIMENSIONS ORDERING GUIDE