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AD780CR Datasheet(PDF) 1 Page - Analog Devices |
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AD780CR Datasheet(HTML) 1 Page - Analog Devices |
1 / 10 page REV. B 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a 2.5 V/3.0 V High Precision Reference AD780 FUNCTIONAL BLOCK DIAGRAM NC TEMP +VIN VOUT TRIM GND O/P SELECT 2.5V - NC 3.0V - GND Q6 Q7 R10 R11 R5 R4 R14 R15 R16 R13 NC = NO CONNECT NC 7 2 1 3 4 8 6 5 AD780 PRODUCT DESCRIPTION The AD780 is an ultrahigh precision bandgap reference voltage which provides a 2.5 V or 3.0 V output from inputs between 4.0 V and 36 V. Low initial error and temperature drift com- bined with low output noise and the ability to drive any value of capacitance make the AD780 the ideal choice for enhancing the performance of high resolution ADCs and DACs and for any general purpose precision reference application. A unique low headroom design facilitates a 3.0 V output from a 5.0 V ± 10% input, providing a 20% boost to the dynamic range of an ADC, over performance with existing 2.5 V references. The AD780 can be used to source or sink up to 10 mA and can be used in series or shunt mode, thus allowing positive or nega- tive output voltages without external components. This makes it suitable for virtually any high performance reference application. Unlike some competing references, the AD780 has no “region of possible instability.” The part is stable under all load condi- tions when a 1 µF bypass capacitor is used on the supply. A temperature output pin is provided on the AD780. This pro- vides an output voltage that varies linearly with temperature, al- lowing the AD780 to be configured as a temperature transducer while providing a stable 2.5 V or 3.0 V output. The AD780 is a pin-compatible performance upgrade for the LT1019(A)–2.5 and the AD680. The latter is targeted toward low power applications. The AD780 is available in three grades in plastic DIP, SOIC, and cerdip packages. The AD780AN, AD780AR, AD780BN, AD780BR, and AD780CR are specified for operation from –40 °C to +85 °C. FEATURES Pin-Programmable 2.5 V or 3.0 V Output Ultralow Drift: 3 ppm/ C max High Accuracy: 2.5 V or 3.0 V 1 mV max Low Noise: 100 nV/ √Hz Noise Reduction Capability Low Quiescent Current: 1 mA max Output Trim Capability Plug-In Upgrade for Present References Temperature Output Pin Series or Shunt Mode Operation ( 2.5 V, 3.0 V) PRODUCT HIGHLIGHTS 1. The AD780 provides a pin-programmable 2.5 V or 3.0 V output from a 4 V to 36 V input. 2. Laser trimming of both initial accuracy and temperature coefficients results in low errors over temperature without the use of external components. The AD780BN has a maximum variation of 0.9 mV from –40 °C to +85°C. 3. For applications requiring even higher accuracy, an optional fine-trim connection is provided. 4. The AD780 noise is extremely low, typically 4 µV p-p from 0.1 Hz to 10 Hz and a wideband spectral noise density of typically 100 nV/ √Hz. This can be further reduced if desired, by simply using two external capacitors. 5. The temperature output pin enables the AD780 to be config- ured as a temperature transducer while providing a stable output reference voltage. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2000 |
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