a FEATURES Low Quiescent Current: 250 A max Laser Trimmed to High Accuracy: 2.5 V ؎5 mV max (AN, AR Grade) Trimmed Temperature Coefficient: 20 ppm/؇C max (AN, AR Grade) Low Noise: 8 V p from 0.1 Hz to 10 Hz 250 nV/√Hz Wideband Temperature Output Pin (N, R Packages) Available in Three Package Styles: 8-Pin Plastic DIP, 8-Pin SOIC and 3-Pin TO-92
Low Power, Low Cost 2.5 V Reference AD680* CONNECTION DIAGRAMS
BOTTOM VIEW (Not to Scale)
TOP VIEW (Not to Scale)
NC = NO CONNECT * TP DENOTES FACTORY TEST POINT. NO CONNECTIONS SHOULD BE MADE TO THESE PINS.
The AD680 is a bandgap voltage reference which provides a fixed 2.5 V output from inputs between 4.5 V and 36 V. The architecture of the AD680 enables the reference to be operated at a very low quiescent current while still realizing excellent dc characteristics and noise performance. Trimming of the high stability thin-film resistors is performed for initial accuracy and temperature coefficient, resulting in low errors over temperature.
1. The AD680 bandgap reference operates on a very low quiescent current which rivals that of many two-terminal references. This makes the complete, higher accuracy AD680 ideal for use in power sensitive applications.
The precision dc characteristics of the AD680 make it ideal for use as a reference for D/A converters which require an external precision reference. The device is also ideal for A/D converters and, in general, can offer better performance than the standard on-chip references. Based upon the low quiescent current of the AD680, which rivals that of many incomplete two-terminal references, the AD680 is recommended for low power applications such as hand-held battery equipment. A temperature output pin is provided on the 8-pin package versions of the AD680. The temperature output pin provides an output voltage that varies linearly with temperature and allows the AD680 to be configured as a temperature transducer while providing a stable 2.5 V output.
2. Laser trimming of both initial accuracy and temperature coefficients results in low errors over temperature without the use of external components. The AD680AN and AD680AR have a maximum variation of 6.25 mV between –40°C and +85°C. 3. The AD680 noise is low, typically 8 µV p from 0.1 Hz to 10 Hz. Spectral density is also low, typically 250 nV/√Hz. 4. The temperature output pin on the 8-pin package versions enables the AD680 to be configured as a temperature transducer. 5. Plastic DIP packaging provides machine insertability, while SOIC packaging provides surface mount capability. TO-92 packaging offers a cost effective alternative to two-terminal references, offering a complete solution in the same package in which two-terminal references are usually found.
The AD680 is available in five grades. The AD680AN is specified for operation from –40°C to +85°C, while the AD680JN is specified for 0°C to +70°C operation. Both the AD680AN and AD680JN are available in 8-pin plastic DIP packages. The AD680AR is specified for operation from –40°C to +85°C, while the AD680JR is specified for 0°C to +70°C operation. Both are available in an 8-pin Small Outline IC (SOIC) package. The AD680JT is specified for 0°C to +70°C operation and is available in a 3-pin TO-92 package. *Protected by U.S. Patent Nos. 4,902,959; 4,250,445 and 4,857,862.
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