2.5 V/3.0 V High Precision Reference Data Sheet AD780

1 V. High Precision Reference Data Sheet AD780 . FEATURES FUNCTIONAL BLOCK DIAGRAM. +VIN DNC. Pin programmable V or V output 2 7. Ultralow drift: 3 ppm/ C max AD780 . High accuracy: V or V 1 mV max Low noise: 100 nV/ Hz R10 R11. Noise reduction capability DNC 1. 6 VOUT. Low quiescent current: 1 mA max R13. Output trim capability Q6. Plug-in upgrade for present references Q7 R16. R5 5 TRIM. Temperature output pin R14. TEMP 3. Series or shunt mode operation ( V, V) R15. R4. 4 8. GND O/P SELECT. 00841-001. DNC.

2 DNC = DO NOT CONNECT TO THIS PIN GND. Figure 1. GENERAL DESCRIPTION. The AD780 is an ultrahigh Precision band gap Reference voltage The AD780 is a pin compatible performance upgrade for the that provides a V or V output from inputs between V LT1019(A) and the AD680. The latter is targeted toward and 36 V. Low initial error and temperature drift combined with low power applications. low output noise and the ability to drive any value of capacitance The AD780 is available in three grades in PDIP and SOIC.

3 Make the AD780 the ideal choice for enhancing the performance packages. The AD780AN, AD780AR, AD780BN, AD780BR, of high resolution analog-to-digital converters (ADCs) and and AD780CR are specified for operation from 40 C to +85 C. digital-to-analog converters (DACs), and for any general-purpose Precision Reference application. A unique low headroom design PRODUCT HIGHLIGHTS. facilitates a V output from a V 10% input, providing a 1. The AD780 provides a pin programmable V or V. 20% boost to the dynamic range of an ADC over performance output from a 4 V to 36 V input.

4 With existing V references. 2. Laser trimming of both initial accuracy and temperature The AD780 can be used to source or sink up to 10 mA, and can coefficients results in low errors over temperature without be used in series or shunt mode, thus allowing positive or negative the use of external components. The AD780BN has a output voltages without external components. This makes it maximum variation of mV from 40 C to +85 C. suitable for virtually any high performance Reference application. 3. For applications that require even higher accuracy, an Unlike some competing references, the AD780 has no region of optional fine-trim connection is provided.

5 Possible instability. The part is stable under all load conditions 4. The AD780 noise is extremely low, typically 4 mV p-p when a 1 F bypass capacitor is used on the supply. from Hz to 10 Hz and a wideband spectral noise density of typically 100 nV/ Hz. This can be further A temperature output pin on the AD780 provides an output reduced, if desired, by using two external capacitors. voltage that varies linearly with temperature, allowing the part 5. The temperature output pin enables the AD780 to be to be configured as a temperature transducer while providing a configured as a temperature transducer while providing a stable V or V output.

6 Stable output Reference . Rev. I Document Feedback 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 One Technology Way, Box 9106, Norwood, MA 02062-9106, license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 2002 2017 Analog Devices, Inc.

7 All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support AD780 Data Sheet TABLE OF CONTENTS. Features .. 1 Temperature Functional Block Diagram .. 1 Temperature Output Pin ..7. General Description .. 1 Temperature Transducer Circuit ..8. Product Highlights .. 1 Supply Current Over Temperature ..8. Revision History .. 2 Turn-On Time ..8. 3 Dynamic Performance ..9. Absolute Maximum Ratings .. 4 Line Thermal Resistance .. 4 Precision Reference for High Resolution 5 V Data 4 Converters.

8 10. ESD Caution .. 4 V Reference from 5 V Supply .. 10. Theory of Operation .. 5 Negative ( V) Reference .. 10. Applying the 6 Outline Dimensions .. 11. Noise Performance .. 6 Ordering Guide .. 12. Noise Comparison .. 7. REVISION HISTORY. 8/2017 Rev. H to Rev. I 12/2012 Rev. E to Rev. F. Added Thermal Resistance Section and Table 3; Renumbered Updated Outline Dimensions .. 11. Sequentially .. 4 Changes to Ordering Guide .. 12. 10/2015 Rev. G to Rev. H 5/2004 Rev. D to Rev. E. Changes to Table 3 .. 4 Updated Format.

9 Universal Changes to Notes Section .. 4 Changes to Temperature Transducer Circuit Section ..8. Changes to Ordering Guide .. 12. 8/2015 Rev. F to Rev. G. Changed NC to DNC .. Throughout 1/2004 Rev. C to Rev. D. Added Solder Heat Shift Parameter, Table 1 .. 3 Changes to Specifications ..2. Added Table 3; Renumbered Sequentially .. 4 Updated Ordering Guide ..3. Changes to Figure 3 .. 4 Updated Outline Dimensions .. 10. Change to Notes Section .. 4. Changes to Ordering Guide .. 12 5/2002 Rev. B to Rev. C. Updates to Packages.

10 10. Rev. I | Page 2 of 12. Data Sheet AD780 . SPECIFICATIONS. TA = 25 C, VIN = 5 V, unless otherwise noted. Table 1. AD780AN/AD780AR AD780CR AD780BN/AD780BR. Parameter Min Typ Max Min Typ Max Min Typ Max Unit OUTPUT VOLTAGE. V Out V. V Out V. SOLDER HEAT SHIFT. Mean mV. Sigma mV. OUTPUT VOLTAGE DRIFT1. 40 C to +85 C 7 7 3 ppm/ C. 55 C to +125 C 20 20 ppm/ C. LINE REGULATION. V Output, 4 V +VIN 36 V, TMIN to TMAX 10 10 10 V/V. V Output, V +VIN 36 V, TMIN to TMAX 10 10 10 V/V. LOAD REGULATION, SERIES MODE.