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AD780:  2.5 V/3.0 V Ultrahigh Precision Bandgap Voltage Reference

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 combined 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 ...More

AD780:  2.5 V/3.0 V Ultrahigh Precision Bandgap Voltage Reference

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 combined 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 negative 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 conditions when a 1 µF bypass capacitor is used on the supply.

A temperature output pin is provided on the AD780. This provides an output voltage that varies linearly with temperature, allowing 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 two grades in plastic DIP, SOIC and cerdip packages. The AD780AN, AD780AR, AD780BN and AD780BR are specified for operation from -40°C to +85°C. The AD780SQ and AD780SQ/883B are specified for -55°C to +125°C operation.

RESOURCES & TOOLS

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  • 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
  • Temperatue Output PIN
  • Series or Shunt Mode Operation 2.5 V, ±3.0 V)
  • Vout: 2.5
  • Initial Accuracy (%): 0.04
  • Ref Out TC (ppm/C): 3ppm/C
  • Supply Voltage Range (V): +4 to +36
  • Supply Current : 1mA
  • Ref Output Current (mA): 10mA
  • 0.1-10 Hz Noise (µV p-p): 4µV p-p
  • Temp Range(s): -40 to +85
  • Package: DIP,SOIC
  • Reference Type: Series-Multi/Select Out

Functional Block Diagram for AD780

AD780 Diagram
Functional Block Diagram for AD780

Circuits from the Lab

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Of Note ...

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AD1580 1.2 0.08 50 5 n/a n/a, shunt ref -40 to +85 n/a Shunt SC70, SOT23 $0.61 1.2 V Micropower, Precision Shunt Voltage Reference
ADR512 1.2 0.3 60 4 n/a n/a shunt ref -40 to +85 n/a Shunt SOT23 $0.60 1.2 V Precision, Low Noise Shunt Voltage Reference
ADR280 1.2 0.4 5 2.2 100 +2.4 to +5.5 -40 to +85 16µA Series SC70, SOT23 $0.76 1.20 V, Low Noise, Low Power, High PSRR, Precision Voltage Reference
AD589 1.2 1.2 10 5 n/a n/a, Shunt Type Reference -55 to +125, 0 to +70 50µA Shunt Metal Can, SOIC $1.33 Two-Terminal IC 1.2 V Shunt Reference
ADR1581 1.25 0.12 50 4.5 n/a n/a, shunt ref -40 to +85 n/a Shunt SOT23 $0.61 1.25 V Micropower, Precision Shunt Voltage Reference
ADR127 1.25 0.12 3 5 5 +2.7 to +18 -40 to +125 125µA Series TSOT $0.92 1.25V, Precision Micropower LDO Voltage Reference
ADR827 1.25 0.4 15 8 5 +2.7V to +15V -40 to +125 400µA Series MSOP $1.11 Low Power, Precision Reference and Op Amp
ADR1500 1.2875 0.2 170 5 n/a n/a, shunt reference -40 to +85 n/a Shunt SC70 $1.03 1.2875 V Micropower, Shunt Voltage Reference
ADR318 1.8 0.27 5 5 5 +2.4 to +15 0 to +70 120µA Series-Low Dropout SOT23 $0.82 1.8 V Precision Voltage Reference
AD588 10 0.01 1.5 6 10 Vdd-Vss = (Vout+2) to +36 -25 to +85, 0 to +70 10mA Series-Multi/Select Out DIP $15.21 +10 V, +5 V, ±5 V tracking, −5 V, −10 V, High Precision Voltage Reference
AD688 10 0.02 1.5 6 10 Vdd-Vss = (Vout+2) to 36 -40 to +85, -55 to +125 12mA Series-Multi/Select Out DIP, SOIC $9.19 High Precision ±10 V Reference
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ADR430 2.048 0.05 1 3.5 30 +4.1 to +18 -40 to +125 800µA Series MSOP, SOIC $2.96 2.048 V High Precision, Low Noise XFET® Reference with Output Sink and Source Capability
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REF191 2.048 0.1 2 20 30 +2.3 to +15 -40 to +85 45µA Series-Low Dropout DIP, SOIC $1.38 2.048, Precision Micropower, Low Dropout, Low Voltage Reference
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